Fisher Paykel Humidifier MR480 User Manual

TECHNICAL MANUAL  
R E S P I R A T O R Y H U M I D I F I E R S  
MODELS:  
MR730  
MR720  
MR700  
MR480  
Revision F  
Issued March 2001  
Fisher & Paykel Healthcare Ltd  
Auckland, New Zealand  
Download from Www.Somanuals.com. All Manuals Search And Download.  
iii  
CONTENTS  
PAGE  
1.0 MR700 SERIES GENERAL SPECIFICATIONS ................................................................................1  
1.1  
Electrical Specifications ................................................................................................................................................................1  
1.1.1  
1.1.2  
1.1.3  
Models MR730/720/700...................................................................................................................................................1  
Model MR480....................................................................................................................................................................1  
Common Electrical Specifications (All Models)...........................................................................................................1  
1 . 2  
1.3  
1.4  
1.5  
1.6  
Standards and Approvals ................................................................................................................................................................1  
Temperature Control ......................................................................................................................................................................1  
Temperature Sensing .....................................................................................................................................................................1  
Temperature Display ......................................................................................................................................................................2  
Glossary of Abbreviations ..............................................................................................................................................................2  
2.0 OPERATING CONTROLS AND MODES ..........................................................................................3  
2.1  
Adjustable Controls ........................................................................................................................................................................3  
2.1.1  
2.1.2  
Airway Temperature Control..........................................................................................................................................3  
Chamber Control (Heater Wire On Mode Only)..........................................................................................................3  
2.2  
Push Switches ..................................................................................................................................................................................3  
2.2.1  
2.2.2  
2.2.3  
2.2.4  
Mute Button......................................................................................................................................................................3  
Chamber Temp Button.....................................................................................................................................................3  
Standby Button (MR700/720/730 only).........................................................................................................................4  
Heater Wire Switch (MR720, MR730 only)...................................................................................................................4  
2.3  
Power Up Sequences .......................................................................................................................................................................4  
2.3.1  
2.3.2  
Version 1.0 Software.........................................................................................................................................................4  
Version 2.0 and Version 3.0 Software ............................................................................................................................4  
2.4  
2 .5  
2. 6  
Heater Wire On Mode (All models except MR480)..................................................................................................................4  
MR730/720 in Heater Wire Off Mode and MR480 ..................................................................................................................4  
Warm Up Mode.................................................................................................................................................................................5  
2.6.1  
2.6.2  
Warm up mode exiting conditions (low temperature alarm enabled):.......................................................................5  
MR720 (Version 2.0, 3.0 Software).................................................................................................................................5  
2.7  
Standby Mode....................................................................................................................................................................................5  
2.7.1  
2.7.2  
MR700/MR730 (All software versions), MR720 (Version 1.0 Only).........................................................................5  
MR720 Standby Mode (Version 2.0 and 3.0 software only)......................................................................................5  
3.0 ALARMS AND INDICATORS.............................................................................................................6  
3.1  
Temperature Probe Alarm.............................................................................................................................................................6  
3 . 2  
Alarms In Heater Wire Mode (MR700/720/730 only).............................................................................................................6  
3.2.1  
3.2.2  
3.2.3  
3.2.4  
3.2.5  
3.2.6  
Heater Wire Alarm............................................................................................................................................................6  
Airway temperature High Alarm.....................................................................................................................................6  
Airway temperature Low Alarm......................................................................................................................................6  
Chamber Temp High Alarm.............................................................................................................................................7  
Chamber Temp Low Alarm activation ...........................................................................................................................7  
Set Low Warning..............................................................................................................................................................7  
3.3  
Temperature Alarms in Non Heater Wire Mode (includes MR480).....................................................................................7  
3.3.1  
3.3.2  
3.3.3  
Heater Wire Alarm............................................................................................................................................................7  
Airway Temperature High Alarm...................................................................................................................................7  
Airway Temperature Low Alarm....................................................................................................................................7  
3.4  
3.5  
Audio Alarm.....................................................................................................................................................................................8  
Safety Protection (All Models)......................................................................................................................................................8  
3.5.1  
3.5.2  
Temperature Deviations ..................................................................................................................................................8  
Microprocessor Watch Dog...........................................................................................................................................8  
Ref. 185040646 *MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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iv  
4.0 CIRCUIT OPERATION .........................................................................................................................9  
4.1  
4.2  
Introduction......................................................................................................................................................................................9  
Control Board..................................................................................................................................................................................9  
4.2.1  
4.2.2  
4.2.3  
4.2.4  
4.2.5  
4.2.6  
4.2.7  
4.2.8  
4.2.9  
Control Thermistors ......................................................................................................................................................... 9  
Input Analog Switches U8 and U9................................................................................................................................ 9  
Analog to Digital Converter U10 b,d,e.......................................................................................................................... 9  
Processor Control U3....................................................................................................................................................... 9  
Power Line Interrupt (Revisions D/F PCBs)............................................................................................................... 10  
Power Line Interrupt (Revision H PCB and later)...................................................................................................... 10  
41 °C Comparator............................................................................................................................................................ 10  
Heaterplate Overtemperature........................................................................................................................................ 10  
Watch Dog...................................................................................................................................................................... 10  
4.3  
4.4  
Power Board...................................................................................................................................................................................11  
4.3.1  
4.3.2  
Revision D/F PCBs ......................................................................................................................................................... 11  
Revision H AND J PCBs ............................................................................................................................................... 11  
Probe Temperature versus Thermistor Resistance...............................................................................................................11  
5.0 CALIBRATION ....................................................................................................................................12  
5.1  
5.2  
5.3  
5.4  
Introduction....................................................................................................................................................................................12  
Equipment Required......................................................................................................................................................................12  
Calibration Procedure for Models with Revision D PCBs or earlier..................................................................................12  
Calibration Procedure for Models with Revision F PCBs or later ......................................................................................12  
6.0 PERFORMANCE CHECK ..................................................................................................................14  
6.1  
6.2  
Introduction....................................................................................................................................................................................14  
Performance Check MR730/720/700 ......................................................................................................................................14  
6.2.1  
6.2.2  
6.2.3  
6.2.4  
Equipment Setup Notes:................................................................................................................................................ 14  
Setup ................................................................................................................................................................................ 14  
Temperature Control Check MR700/720/730.............................................................................................................. 14  
Alarms check MR700/720/730 ...................................................................................................................................... 15  
6.3  
6.4  
Performance Check (MR480)....................................................................................................................................................15  
6.3.1  
6.3.2  
6.3.3  
6.3.4  
Equipment Required....................................................................................................................................................... 15  
Setup ................................................................................................................................................................................ 15  
Temperature Control Check (MR480).......................................................................................................................... 15  
Alarms check - MR480................................................................................................................................................... 16  
Dual Probe Temperature Test....................................................................................................................................................16  
6.4.1  
6.4.2  
Equipment Required....................................................................................................................................................... 16  
Test Procedure................................................................................................................................................................ 16  
7.0 SERVICING INFORMATION............................................................................................................17  
7.1  
7.2  
Introduction....................................................................................................................................................................................17  
Printed Circuit Board Removal ..................................................................................................................................................17  
7.2.1  
7.2.2  
Control PCB..................................................................................................................................................................... 17  
Power PCB....................................................................................................................................................................... 17  
7.3  
COMPATABILITY.......................................................................................................................................................................17  
7.3.1  
7.3.2  
7.3.3  
Hardware compatability................................................................................................................................................. 17  
MR480 Transformers ..................................................................................................................................................... 18  
Software compatability.................................................................................................................................................. 18  
7.4  
Heaterplate .....................................................................................................................................................................................18  
7.4.1 Heaterplates with screw-in standoffs.......................................................................................................................... 19  
7.5  
7.6  
Fault Location ................................................................................................................................................................................19  
Screw Torque Settings.................................................................................................................................................................19  
Ref. 185040646 *MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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v
8.0 SCHEMATICS, PART LISTS AND MECHANICAL DRAWINGS ................................................20  
8.1  
8.2  
8.3  
8.4  
8.5  
8.6  
8.7  
8.8  
8.9  
MR700 Series Circuit Layout Block Diagram ...................................................................................................................... 20  
Component Layout - Revision H and J PCB............................................................................................................................. 21  
Component Layout - Revision F PCB ........................................................................................................................................ 22  
Link Pad Locations for Programming Control Options - Revision H and J PCB............................................................ 23  
Circuit Diagrams - Revision H and J PCB Control PCB ................................................................................................... 25  
Circuit Diagrams - Revision H and J PCB Power PCB ...................................................................................................... 26  
Circuit Diagrams - Revision F PCB Control PCB.............................................................................................................. 27  
Circuit Diagrams - Revision F PCB Power PCB ................................................................................................................ 28  
Electrical Parts List..................................................................................................................................................................... 29  
8.9.1  
8.9.2  
Control Board Components: (Revision h and later PCBs)........................................................................................29  
Power Board Components: (Revision h and later PCBs)..........................................................................................31  
8.10 Mechanical Parts List................................................................................................................................................................. 32  
8.10.1 MR480 Mechanical Parts...............................................................................................................................................32  
8.10.2 Exploded Diagrams: MR480 ..........................................................................................................................................33  
8.10.3 MR730/720/700 Mechanical Parts ................................................................................................................................34  
8.10.4 Exploded Diagrams: MR730/720/700............................................................................................................................36  
8.10.5 Heaterplate Assembly Parts (MR730/720/700/480) ...................................................................................................37  
8.10.6 Exploded Diagrams:Heaterplate Assembly MR730/720/700/480 (Inverted View).................................................38  
8.11 PCB Identification Diagram....................................................................................................................................................... 39  
8.12 Power PCB Harness Connection Diagram.............................................................................................................................. 40  
9.0 PRODUCT CHANGE HISTORY........................................................................................................41  
9.1  
9.2  
Model Number Explanation......................................................................................................................................................... 42  
Serial Number Explanation......................................................................................................................................................... 42  
APPENDIX A................................................................................................................................................43  
A1  
A2  
Calibration Mode .......................................................................................................................................................................... 43  
Engineering Menu........................................................................................................................................................................ 43  
A2.1  
A2.2  
A2.3  
Engineering display functions: Heater Wire Mode...................................................................................................43  
Engineering Functions: Non Heater Wire Mode.......................................................................................................44  
Integral Display...............................................................................................................................................................44  
A3  
A4  
A5  
Programming Control Options.................................................................................................................................................. 44  
Error Codes ................................................................................................................................................................................... 44  
MR700 Series Humidifier Serial Data Interface................................................................................................................... 45  
A5.1  
A5.2  
A5.3  
A5.4  
Serial Data Format...........................................................................................................................................................45  
Status Information..........................................................................................................................................................45  
Remote Standby..............................................................................................................................................................46  
Serial Data Interface Connector....................................................................................................................................47  
APPENDIX B................................................................................................................................................48  
B1  
Maintenance Schedule................................................................................................................................................................. 48  
B1.1  
B1.2  
B1.3  
B1.4  
Monthly ...........................................................................................................................................................................48  
Three Monthly ................................................................................................................................................................48  
Annually ..........................................................................................................................................................................48  
Annually Or In Accordance With Relevant Country Regulations.........................................................................48  
B2  
Maintenance Schedule Checklist.............................................................................................................................................. 49  
APPENDIX C................................................................................................................................................50  
C1  
Troubleshooting Guide For The MR700 Series Respiratory Humidifiers ....................................................................... 50  
C1.1  
Low Temperature ............................................................................................................................................................50  
Ref. 185040646 *MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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vi  
C.1.2  
C.1.3  
C.1.4  
C1.5  
C1.6  
C1.7  
C1.8  
C1.9  
High Temperature........................................................................................................................................................... 51  
Temperature Fluctuating............................................................................................................................................... 51  
Excessive Water In Circuit ............................................................................................................................................ 51  
Low humidity .................................................................................................................................................................. 52  
Alarms .............................................................................................................................................................................. 52  
Temperature display ...................................................................................................................................................... 53  
Breathing circuit leak..................................................................................................................................................... 53  
External water leak.......................................................................................................................................................... 53  
C1.10 LED on ............................................................................................................................................................................. 53  
C2  
MR700 Series Fault Flow Chart For No Go Condition ..........................................................................................................54  
APPENDIX D ...............................................................................................................................................55  
D1  
D2  
Cleaning of Humidifier Heater Bases .......................................................................................................................................55  
Cleaning of Airway Temperature Probes .................................................................................................................................55  
APPENDIX E................................................................................................................................................56  
e1  
E2  
Additional Dynamic Performance Check of Humidifiers......................................................................................................56  
Performance Check MR730/720/700 ......................................................................................................................................56  
E2.1  
E.2.2  
E.2.3  
Equipment Setup ............................................................................................................................................................ 56  
Setup ................................................................................................................................................................................ 56  
Dynamic Test Sequence (MR730/720/700)................................................................................................................. 57  
E.3  
Performance Check (MR480)....................................................................................................................................................57  
E.3.1  
E.3.2  
E.3.3  
Equipment Setup ............................................................................................................................................................ 57  
Setup ................................................................................................................................................................................ 58  
Dynamic Test Procedure (MR480)............................................................................................................................... 58  
Ref. 185040646 *MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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1
1.0 MR700 SERIES GENERAL SPECIFICATIONS_________________________  
This documentation defines the technical specifications of the MR730, MR720, MR700 and MR480 respiratory  
humidifiers, it also includes maintenance and repair procedures.  
The MR730/720 models are Heated Wire humidifiers with the option of disabling the Heater Wire.  
The MR720 has a lower alarm limit and an extended warmup mode for use in Anaesthesia.  
The MR700 model is exclusively a Heated Wire humidifier.  
The MR480 model is a non Heated Wire humidifier.  
1.1  
ELECTRICAL SPECIFICATIONS  
1.1.1 MODELS MR730/720/700  
Supply Voltage 230 ± 25 V  
127 ± 12 V  
115 V  
100 ± 10 V  
Supply Frequency 50 or 60 Hz  
Supply Current 1.0 A maximum at 230 V  
1.9 A maximum at 127 V  
2.0 A maximum at 115 V  
2.4 A maximum at 100 V  
Heater Wire Capacity 60 W  
1.1.2 MODEL MR480  
Supply Voltage: 230 ± 25 V  
115 V  
100 ±10 V  
Supply Frequency 50 or 60 Hz  
Supply Current 0.7 A maximum at 230 V  
1.4 A maximum at 115 V  
1.6 A maximum at 100 V  
1.1.3 COMMON ELECTRICAL SPECIFICATIONS (ALL MODELS)  
Heaterplate Power 150 W  
Heaterplate Overheat Protector Operates at 118 ± 6 °C  
1.2  
STANDARDS AND APPROVALS  
Classification under:  
CSA-C22.2 No.125 , UL2601  
IEC601-1, AS3200.1, EN60601-1  
Class 1  
Type B  
Drip Proof  
Continuous Operation  
Not to be used in the presence of flammable anaesthetics.  
1.3  
1.4  
TEMPERATURE CONTROL  
PID (Proportional Integral Derivative) control of Heater Wire (in Heated Wire mode operation only) and heaterplate.  
TEMPERATURE SENSING  
Temperature measurement using standard characteristic thermistors (YSI 400 compatible) mounted in fast response  
temperature probes, located at the patient end of the delivery tube and at the humidifying chamber outlet.  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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2
1.5  
1.6  
TEMPERATURE DISPLAY  
Three digit 14mm 7 segment LED (Light Emitting Diode) display.  
Range 5.0 to 80.0 °C. Below 5.0 °C displays ‘Lo’. Above 80.0 °C displays ‘Hi’.  
Accuracy 25.0 ± 0.3 °C to 45.0 ± 0.3 °C.  
GLOSSARY OF ABBREVIATIONS  
EOH  
The End Of Hose temperature.  
OFFSET The temperature difference of the TOP from the SET.  
SET  
TOP  
RSD  
The temperature Set potentiometer. Sets the controlling temperature of the EOH.  
The temperature at the Top of the humidification chamber.  
Remote Shut Down.  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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3
2.0 OPERATING CONTROLS AND MODES _____________________________  
2.1  
ADJUSTABLE CONTROLS  
2.1.1 AIRWAY TEMPERATURE CONTROL  
Selects the airway controlling temperature. The range of adjustment is from 31 to 40 °C over a linear scale marked in  
degrees on the front panel.  
The temperature can be set with a resolution of 0.1 °C. The set temperature is flashed on the display when the control  
knob is rotated and continues to be flashed for five seconds after the last adjustment.  
2.1.2 CHAMBER CONTROL (HEATER WIRE ON MODE ONLY)  
The temperature of the gas leaving the chamber is regulated by the Chamber Control knob, it sets the difference between  
the chamber outlet temperature and the airway temperature delivered to the patient. The setting of the Chamber Control,  
when added to the setting of the Temperature Control, determines the chamber outlet set temperature. This Chamber  
Control has a linear range of adjustment from -5 to +2 °C marked in one degree steps and can be set with a resolution of  
0.5 °C. The value is flashed on the Airway display as the control knob is rotated and continues to be flashed for five  
seconds after the last adjustment.  
Every humidifier is also supplied with a fixed chamber control knob. This prevents inadvertent adjustment of the  
chamber control by preadjusting the existing knob to the desired setting and then replacing the normal knob with the  
fixed knob.  
2.2  
PUSH SWITCHES  
2.2.1 MUTE BUTTON  
A momentary push will disable an audible alarm for 3 minutes (except low temperature alarm in non heater wire mode  
which is 10 minutes).  
A secondary function is that in conjunction with the Chamber Temp switch enables entry to the engineering menu (refer  
Appendix A2).  
On every initial push of the mute button a momentary audio beep indicates function operation.  
2.2.2 CHAMBER TEMP BUTTON  
MR700 Series Humidifiers with Version 1.0 Software:  
Operation of this switch causes the airway temperature display to momentarily blank then show the chamber outlet  
temperature. A green LED adjacent to the switch is enabled to indicate that this function is active. On release of this  
switch the display reverts immediately to show the airway temperature.  
This button is used in conjunction with the mute to enter the engineering menu (refer Appendix A2).  
MR700 Series Humidifiers with Version 2.0 and Version 3.0 Software:  
Operation of this switch causes the airway temperature display to momentarily blank then show the chamber outlet  
temperature. A green LED adjacent to the switch is enabled to indicate that this function is active. On release of this  
switch the display continues to show the chamber outlet temperature for 2 seconds before blanking momentarily and  
reverting to show the airway temperature.  
This button is used in conjunction with the mute to enter the engineering menu (refer Appendix A2).  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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2.2.3 STANDBY BUTTON (MR700/720/730 ONLY)  
This button has to be depressed for one second to enter or exit the standby mode. When the adjacent amber LED starts  
to flash (100/minute) the button can then be released and the Humidifier remains in the standby mode.  
To exit Standby mode press the Standby button for 1 second, the amber LED will then turn off. An audio beep accompanies a change in the Standby mode state.  
2.2.4 HEATER WIRE SWITCH (MR720, MR730 ONLY)  
This is a latching, push operated, switch which selects between the heater wire mode and non-heater wire mode. The  
adjacent green LED, if on, indicates that the humidifier is operating in the heater wire mode. Pressing this switch will  
cause an audible beep and the LED changes to indicate the new state. A heater wire alarm will commence if switching to  
the heater wire mode with heater wire disconnected or if switching to the non heater wire mode if a heater wire is  
connected.  
2.3  
POWER UP SEQUENCES  
2.3.1 VERSION 1.0 SOFTWARE  
After switch on the humidifier goes through the following sequence. Note that each displayed information is flashed for  
2 seconds.  
·
·
Watchdog circuit test  
Display Test  
If successful the ‘SEE MANUAL’ LED lights briefly.  
All indicator LEDs are illuminated and ‘8 .8 .8 .’ is displayed on the Airway  
Temperature display  
·
·
Temperature Control Setting  
Chamber Control setting  
eg ‘37.0’ is displayed  
If heater wire mode is selected then the chamber control setting is displayed  
eg ‘-1.0’. Not applicable for MR480  
·
·
·
Software Version Number  
Maximum Heaterplate setting  
Audio Beep  
‘1.0’  
eg ‘110’  
2.3.2 VERSION 2.0 AND VERSION 3.0 SOFTWARE  
After switch on the humidifier goes through the following sequence. Note that each information is displayed for 2  
seconds, then the display is momentarily blanked.  
·
·
Watchdog circuit test  
Display Test  
If successful the ‘SEE MANUAL’ LED lights briefly.  
All indicator LEDs are illuminated and ‘8 .8 .8 .’ is displayed on the Airway  
Temperature display  
·
·
·
·
Model Number  
eg ‘730’  
eg ‘2.0’  
Software Version Number  
Temperature Control Setting  
Chamber Control setting  
eg ‘37.0’ is displayed  
If heater wire mode is selected then the chamber control setting is displayed  
eg ‘-1.0’. Not applicable for MR480  
eg ‘110’  
·
·
Maximum Heaterplate setting  
Audio Beep  
2.4  
HEATER WIRE ON MODE (ALL MODELS EXCEPT MR480)  
In the Heater Wire On Mode (heater wire switch green LED on) the heaterplate and heater wire are regulated to maintain  
the desired temperature and humidity, within close limits. To minimise rainout or maximise humidification, the chamber  
outlet temperature can be adjusted to control at a fixed offset from the set airway temperature. The front panel Chamber  
Control knob is used for this purpose, see § 2.1.2 above.  
2.5  
MR730/720 IN HEATER WIRE OFF MODE AND MR480  
In the non Heater Wire mode of the MR730/720 (heater wire switch green LED off) the delivery temperature is maintained  
by heaterplate control only. The sensor at the delivery hose end controls the heaterplate to deliver the selected  
temperature. The sensor at the chamber outlet is employed in a backup safety mode, to limit the chamber outlet  
temperature to a maximum of 66 °C. In this way safety at low flow rates (below 5 l/minute) is enhanced at the sacrifice of  
some low flow performance.  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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2.6  
WARM UP MODE  
After initial turn on, warm up mode is entered. In this mode the Low temperature alarm is disabled. The Low temperature alarm is  
enabled when warm up mode is exited.  
2.6.1 WARM UP MODE EXITING CONDITIONS (LOW TEMPERATURE ALARM ENABLED):  
·
(MR700/MR730(All versions) and MR720(version 1.0) in Heater Wire Mode)  
Warm Up mode continues until the Software Detects-  
Either: The airway temperature reaches within 0.8 °C of the Temperature Control set point.  
Or:  
Or:  
·
The airway temperature has not increased by 2 °C for at least 4 minutes (2 minutes for version 3.0 software).  
The airway temperature has not got within 2 °C of the set point after ten minutes from switch on.  
(MR700/MR730(all versions) and MR720(version 1.0) in Non Heater Wire Mode and MR480)  
Warm Up mode continues until the Software Detects-  
Either: The airway temperature gets above 30 °C.  
Or:  
Or:  
The airway temperature has not increased by 2 °C within 15 minutes.  
The airway temperature has increased by 2 °C within 15 minutes but still has not reached 30 °C after a further 15  
minutes.  
Note:In this mode the audio alarm is not enabled until 30 seconds after the Airway Temp Low LED switches on.  
At this time the heaterplate circuit switches off, pressing mute will silence the alarm for 10 minutes, during  
which time the heaterplate power is enabled  
2.6.2 MR720 (VERSION 2.0, 3.0 SOFTWARE)  
If the above warm up exiting conditions are not initially met the MR720 will automatically enter the standby mode for 20  
minutes for version 2.0 software and 30 minutes for version 3.0 software (refer § 2.7.2).  
2.7  
STANDBY MODE  
2.7.1 MR700/MR730 (ALL SOFTWARE VERSIONS), MR720 (VERSION 1.0 ONLY)  
The standby mode can be entered or exited by depressing the standby button for 1 second. A beep will be emitted once  
successful entered or exited standby mode (refer § 2.2.3).  
In the standby mode all Low Temperature alarms are inhibited, the heaterplate is controlled to a nominal 40.0 °C and the  
heater wire is on a 15 % duty cycle.  
Standby mode is automatically exited after 20 minutes (30 minutes for version 3.0 software) and the warm up mode is  
entered (the low temperature alarms remain disabled - refer § 2.6).  
A Remote Standby request (see Appendix A5.3) enables the standby mode and turns the standby amber LED permanently on.  
2.7.2 MR720 STANDBY MODE (VERSION 2.0 AND 3.0 SOFTWARE ONLY)  
The MR720 has a special feature where it will go into a standby mode automatically after turn on if the warm up exiting  
conditions are not met. This standby mode time is 20 minutes for version 2.0 and 30 minutes for version 3.0 software.  
While in standby mode, if the airway temperature increases by 2 °C at any time, the MR720 will exit stand by mode and  
enter warm up mode. The unit then monitors the warm-up exiting conditions(see § 2.6.1 and 2.6.2), and if these are not  
met, then the unit re-enters Standby mode.  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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6
3.0 ALARMS AND INDICATORS _____________________________________  
3.1  
TEMPERATURE PROBE ALARM  
If the airway temperature probe is disconnected or develops a low or high resistance the Temperature Probe alarm will be  
enabled. Indication is by a ‘- - -' message on the airway temperature display plus a flashing Temperature Probe red LED  
and an audio alarm.  
Five specific fault types can be diagnosed and are displayed by the sequence of ‘decimal points’ in the display, as  
shown below:  
a
Temperature Probe not plugged in.Low temperature (~ 0 °C)  
Open circuit chamber outlet probe  
- - -  
Open circuit in common lead in probe cable.  
Open circuit patient airway probe  
Very low temperature (~ 0 °C)  
Short circuit chamber outlet probe  
Very high temperature (~ 100 °C)  
Short circuit patient airway probe  
Very high temperature (~ 100 °C)  
Short in probe cable between patient airway probe and chamber outlet probe  
b
c
d
e
- - -.  
- -.-  
- -.-.  
-.- -  
The faults (a to d) above are checked for at a rate of about twice per second. The final fault (e) which does not  
immediately cause any apparent operating anomaly is checked twice a minute.  
A Temperature Probe Alarm immediately shuts down both heater wire and heaterplate.  
Once the alarm condition has been removed the humidifier will enter warm up mode (refer § 2.6).  
3.2  
ALARMS IN HEATER WIRE MODE (MR700/720/730 ONLY)  
3.2.1 HEATER WIRE ALARM  
If the heater wire is disconnected or there is a fault with the heater wire circuit, then the Heater Wire alarm LED will start  
flashing and the audio alarm will be enabled. Both heater wire and heaterplate circuits will be shutdown. The display will  
continue to indicate the temperature sensor reading (unless the heater wire fuse is open circuit).  
An open circuit heater wire fuse is indicated by ‘F-2’ appearing on the Airway Temperature display.  
On MR720/730 if the Heater Wire is connected but switched off, the alarm will sound (refer § 2.2.4).  
Note: If ‘F-2’ is displayed and the F2 fuse is intact then check the calibration of the 41 °C overheat (refer § 5).  
3.2.2 AIRWAY TEMPERATURE HIGH ALARM  
The red Airway Temp High LED will flash and an audible alarm will sound if the gas temperature being delivered to the  
patient is 2 °C higher than the Temperature Control setting. A high temperature alarm instantly disables both heater  
circuits.  
3.2.3 AIRWAY TEMPERATURE LOW ALARM  
The red Airway Temp Low LED will flash and an audible alarm will sound if the gas temperature being delivered to the  
patient is 2 °C lower (4 °C for MR720 model) than the Temperature Control setting. If Airway Temperature Low alarm  
condition persists for more than 100 seconds the heaterplate and heater wire circuits will switch off. Pressing the mute  
button will silence the Audio alarm and resume heat for a further 100 seconds, the Airway Temperature Low LED will  
continue to flash. This alarm is disabled during warm-up. See § 2.6.1.  
If the airway temperature drops below 5°C the display will show ‘LO’ and an audible alarm will sound.  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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7
3.2.4 CHAMBER TEMP HIGH ALARM  
This alarm will activate if:  
·
The temperature of gas leaving the humidification chamber outlet is more than 4 °C higher than the chamber set  
temperature for more than 20 minutes. (The chamber set temperature is the sum of the Temperature Control  
setting and the Chamber Control setting).  
·
The temperature of the gas leaving the humidification chamber outlet exceeds the chamber set temperature by  
10 °C or more.  
This alarm causes the heater circuits to switch off and the ‘Chamber Temp High’ amber LED indicator to start flashing.  
The audio alarm (which can be muted) is also enabled. This alarm remains active until the high temperature condition is  
cleared.  
3.2.5 CHAMBER TEMP LOW ALARM ACTIVATION  
For Chamber Set Temperature < 35 °C  
The temperature of gas leaving the humidification  
chamber outlet is less than 4 °C lower than the  
chamber set temperature for more than 20 minutes.  
For Chamber Set Temperature 35 °C  
The temperature of gas leaving the humidification  
chamber outlet is less than 31 °C for more than 20  
minutes.  
The Chamber Temp Low alarm amber LED will begin to flash and the audio alarm is enabled. This alarm remains active  
until the low temperature condition is cleared. Pushing the mute button will silence the Audio alarm.  
3.2.6 SET LOW WARNING  
Version 1.0 and Version 2.0 Software  
This alarm will activate if the chamber set temperature is below 31.0 °C. In this case the Set Low amber LED will  
immediately be enabled and remain on, until such time as the chamber set temperature is adjusted above 31.0 °C. There is  
no audible alarm.  
Version 3.0 Software  
This alarm will activate if either the chamber set temperature or Temperature Control setting is below 34.0 °C.  
In these cases the Set Low amber LED will immediately be enabled and remain on, until such time as the set airway or  
chamber set temperature is adjusted above 34.0 °C. There is no audible alarm.  
3.3  
TEMPERATURE ALARMS IN NON HEATER WIRE MODE (INCLUDES MR480)  
3.3.1 HEATER WIRE ALARM  
This indicates that a heater wire has been connected when the non heater wire mode has been selected (Heater Wire  
‘On’ LED is off). In this case the Heater Wire alarm LED will be flashing, the audio alarm begins and the heaterplate is  
switched off.  
3.3.2 AIRWAY TEMPERATURE HIGH ALARM  
The red Airway Temp High LED will flash and an audible alarm will sound if the gas temperature being delivered to the  
patient is 41 °C or higher. Power to the heaterplate is immediately shut off.  
3.3.3 AIRWAY TEMPERATURE LOW ALARM  
The red Airway Temp Low LED will flash and an audible alarm will sound if the gas temperature being delivered to the  
patient is 29.5 °C or less.  
The audio alarm is not enabled for 30 seconds after the low temperature LED begins flashing.  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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8
Pushing the mute button mutes the audio alarm for ten minutes and restores power to the heaterplate during this time.  
The Airway Temp Low LED will continue to flash. This alarm is disabled during warmup. See § 2.6.2.  
If the airway temperature drops below 5°C the display will show ‘LO’ and an audible alarm will sound.  
3.4  
3.5  
AUDIO ALARM  
A choice of the ISO draft standard audio alarm or a gliding tone can be selected by the programming control link (L1).  
Refer Appendix A3.  
A momentary depression of the mute button will silence the audio alarm for about 3 minutes (except for a low  
temperature alarm in no heater wire mode. See § 3.3.3. The relevant LED indicators remain flashing until the alarm  
condition clears. Any new alarm condition occurring within a mute delay will cause the audio alarm to be re-enabled.  
SAFETY PROTECTION (ALL MODELS)  
3.5.1 TEMPERATURE DEVIATIONS  
An over temperature alarm condition causes an immediate shut down of both heater circuits. In the case of a Low  
Temperature alarm, pressing Mute causes heating to recommence, the Low Temperature LED however remains on until  
the fault has cleared. There are two independent backup over temperature protection circuits.  
Firstly, an over temperature protection circuit independent of the microprocessor control continuously monitors the  
airway thermistor sensor. This backup protection is preset to disconnect the heating circuits at 41.0 °C.Secondly, a  
bimetallic thermostat fixed to the heaterplate operates if the heaterplate temperature exceeds 118 ± 6 °C and cuts out the  
mains active supply. On cooling, this protector can only be reset by gaining access to the under surface of the  
heaterplate and manually depressing the red reset button.  
Heaterplate temperature is limited to 110 °C max during normal operation (80 °C for MR720). Optional heaterplate limits of  
50, 80 and 90 °C can be selected. (Refer Appendix A3).  
3.5.2 MICROPROCESSOR WATCH DOG  
A control loop in the operating software continuously monitors for correct operation. Should a fault be detected a  
hardware reset circuit attempts to reinitialise the microprocessor. If this is not successful additional hardware disables  
the heating circuit, blanks the display and turns the Humidifier Fault red LED on.  
The watch dog circuit is tested at turn on by deliberately halting the processor and forcing initialisation.  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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9
4.0 CIRCUIT OPERATION_________________________________________  
4.1  
4.2  
INTRODUCTION  
This section describes briefly the operation of each of the circuit sections. Refer to the circuit diagrams in § 8.5 to 8.8.  
CONTROL BOARD  
The one basic control board, with various discreet hardware changes, provides the controlling functions for the  
MR730/720/700/480 range of humidifiers. Each model however is controlled by a unique software version.  
4.2.1 CONTROL THERMISTORS  
Three standard characteristic thermistors control all temperature functions:  
·
·
One thermistor is mounted in a probe at the end of the delivery hose to measure delivered airway temperature  
(connector J4-1,3). This temperature is indicated by the digital display on the humidifier front panel.  
A second thermistor mounted in a probe measures the chamber temperature at the top of the humidifying  
chamber (connector J4-2,3). In heater wire mode this thermistor is used to monitor and control the chamber  
outlet temperature.  
·
A third thermistor is permanently mounted in intimate contact with the heaterplate (HP) (connector J3-1,3). This  
prevents excessive heaterplate temperatures during a warm up cycle.  
4.2.2 INPUT ANALOG SWITCHES U8 AND U9  
The 1 by 8 analog switch (U8) selects under processor control (PB0-3) various input signals and reference potentials.  
Selected sequentially are potentials giving; (0-3): the position of the temperature set potentiometer VR3, and offset  
potentiometer VR2. (4-6): calibration temperatures of 9, 34.5 and 60 °C across resistors R18, R17 and R16, and from (7):  
the heaterplate (HP) thermistor.  
From the 3 by 2 analog switch (U9) under processor control (PB4-6) the airway temperature and the chamber outlet  
temperatures from the dual probe temperature sensor are also read.  
4.2.3 ANALOG TO DIGITAL CONVERTER U10 B,D,E  
The temperature probe inputs are filtered by the C30, C31, R28, R26, C19, C20 network for EMI suppression. The selected  
output of the analog switch network U8, U9 is fed to pin 10 of U10d, a low pass operational amplifier with a gain of 11.  
This stage is filtered with C23 to give protection from any voltage transients appearing at its input. The integrating stage  
U10b rests for most of the time (50 to 60ms) with R35 connected (through an analog switch in U9) across the integrating  
capacitor C22 holding it in a discharged state. With VR5 and R34 connected to the non-inverting input of U10b the stage  
has a ‘static' gain of about 0.5 giving a resting level of about -2.5 to -3 V at the output pin 1.  
Under processor control (PB6) when the switch section of U9 across C22 is opened the output of U10b ramps up (0.1-5  
ms). This rising ramp voltage is fed via R36 to the comparator stage U10e where it is referenced via R41 to the output  
voltage level of U10d. When the ramp voltage exceeds the threshold level of U10d the output of the comparator stage  
U10e switches high. This fast rising edge, assisted by the speed up capacitor C24, is fed to the RST 6.5 interrupt input of  
U3.  
4.2.4 PROCESSOR CONTROL U3  
After selecting one of the 10 input signals through the switch network of U8, U9 there is a 50 to 60ms pause to allow  
U10d to settle. At this point the switch across the integrator U10b is opened initiating a linear ramp output and the 14 bit  
counter in U4 is started. Within a time period of 100 ns to 5 ms the ramp will cause a RST6.5 interrupt to occur. The  
processor on responding to the interrupt, first stops the counter, then closes the switch across the integrator readying it  
for the next cycle. The input switch network U8, U9 can now be stepped to the next input. The 14 bit counter can now be  
read and its value equated to the input signal. In this way all 10 input channels are continuously scanned. VR5 is set  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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10  
during calibration to give the desired ramp rate. Thus all points are scanned once every 500 to 600 ms, self calibration  
performed, and the digital display updated.  
4.2.5 POWER LINE INTERRUPT (REVISIONS D/F PCBS)  
A sample of the power supply frequency is derived from the power transformer 22 Vac secondary via R56 and Q1,  
buffered by Schmitt trigger U5f and fed to the RST7.5 interrupt of U3. The operating software determines the supply  
frequency facilitating the generation of a real time clock and also enabling a zero crossing detector for triac switching.  
The ADC is also phase synchronised with the line frequency thus eliminating any common error from this source.  
4.2.6 POWER LINE INTERRUPT (REVISION H PCB AND LATER)  
The zero crossing is derived from the 10 Vac secondary. Resistor R61 ensures that the secondary is ground referenced  
when the diodes D13 to D16 are not conducting. Network R1, R69, and C2 removes any unwanted noise from the zero  
crossing circuit. The operating software determines the supply frequency facilitating the generation of a real time clock  
and also enabling a zero crossing detector for triac switching. The ADC is also phase synchronised with the line  
frequency thus eliminating any common error from this source.  
4.2.7 41 °C COMPARATOR  
Operational amplifier U10c is a protection circuit to sense excessive delivery temperature rise. The non inverting input  
pin 5 is connected directly (via connector J4-1) to the patient airway thermistor. The inverting input goes to an  
adjustable divider network R32, VR4, R33. VR4 is set during calibration to ensure that the output pin 7 of U10c is low  
above an input temperature of 41 °C. This low output (OVHT) is fed via the isolating diode resistor networks D19, R55  
and D20, R61 to clamp the bases of switching transistors Q10 and Q12. In this way, a patient airway temperature greater  
than 41 °C causes both heaters to be shut down.  
A watch dog failure, which is a high output from U5g, is communicated via isolating diode D11 and resistor R31 to the  
inverting input of U10c. This also ensures that both heater control circuits are clamped off in the event of a processor  
crash.  
4.2.8 HEATERPLATE OVERTEMPERATURE  
Thermistor HP senses the heaterplate temperature. Should the heaterplate exceed the maximum heaterplate limit (default  
110 °C) during normal operation, power to the heaterplate is discontinued until it cools below this limiting temperature.  
Under certain operating conditions, for increased safety, lower maximum heaterplate temperatures can be selected. (See  
Appendix A3: Programming Control Options.) Also mounted on the heaterplate is a mechanical 118 °C cut out which will  
give protection should the electronic control system fail. This mechanical cut out is connected in series with the power  
transformer primary and thus causes complete shut down of the humidifier should a serious fault develop. See § 3.5.1.  
4.2.9 WATCH DOG  
During operation the processor is continually monitored for correct function. This is done by changing the state of  
output port PB7 of U4 every 16.6 or 20 ms (power line frequency interrupt). This square wave, buffered by U5b, is fed to  
the charge pump circuitry C16, D4, D5 and C15 which ensures that pin 13 of U5g is held hard up. Should this square  
wave be interrupted for any reason, C15 will discharge through R3 giving a high output from pin 12, which drives the  
trap interrupt input of U3. This high trap input forces re-initialisation of the processor which may or may not be  
successful depending on the nature of the fault. The purpose of this is to ensure that if the processor should fail, and is  
unable to re-initialise, it fails in a safe mode. The watch dog circuit is tested every time the humidifier is turned on by  
deliberately halting program execution and waiting for initialisation via the watch dog. To indicate that the processor has  
failed the high output of U5g also turns on Q3 which lights the ‘see manual’ LED10 and also turns off the display I.C. U7  
to blank the digital display.  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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11  
4.3  
POWER BOARD  
4.3.1 REVISION D/F PCBS  
A bridge rectifier (D13 to D16) supplies power to the 5 V regulator Q7 mounted on the heat sink. This circuit is protected  
by a 1 A fuse (F1) mounted on the circuit board. The 5 V negative supply stabilized by Q8, is derived from the voltage  
doubling network D17, D18.  
The Heater Wire (HHC) is controlled by triac Q9 which is mounted on the heat sink. Q9 is switched by the optoisolator  
U11 which in turn is driven by Q10. Q10 is controlled directly from an output port of U4 on the control board.  
The resistor R52 connected to the anode of Q9 provides a signal through (HHS) to U5d and U4. This signal, with  
processor interpretation, provides the information to determine if the Heater Wire is connected or open circuit and also  
the integrity of fuse F2, the 4 A fuse supplying power to the Heater Wire.  
Triac Q11 (mounted on the heatsink) is controlled by optoisolator U12, which in turn is controlled by Q12, and HPC.  
Transistors Q5 and Q6 are a RS232 level driver for the serial data interface.  
4.3.2 REVISION H AND J PCBS  
A bridge rectifier (D13 to D16) supplies power to the 5 V regulator Q7 mounted on the heat sink. This circuit is protected  
by a 1 A fuse (F1) mounted on the circuit board. The 5 V negative supply stabilized by Q8, is derived from the voltage  
doubling network D17, D18.  
The Heater Wire (HHC) is controlled by triac Q9 which is mounted on the heat sink. Q9 is switched by the optoisolator,  
U11, which in turn is driven by Q10. Q10 is controlled directly from an output port of U4 on the control board (HHC).  
Resistor R9, C6 form a snubber on the triac. Capacitors C8, C32 balance the heater wire with respect to ground.  
Heater wire sensing is accomplished through the optoisolator U13 and associated components R51, R52, D21, R66 and  
R67. R51 and R52 limit the current through the LED when the triac is on or off. With the triac off and a heater wire  
connected then the optoisolator will remain off. Otherwise if a heater wire is not connected then the optoisolator will be  
turned on and off in synchronisation with the secondary cycle. The output of the optoisolator feeds U4 on the control  
board. This signal, with processor interpretation, provides the information to determine if the Heater Wire is connected  
or open circuit and also the integrity of fuse F2, the 4 A fuse supplying power to the Heater Wire.  
Q11 controls power to the heaterplate and is under control of optoisolator U12 and transistor Q12 via an output port  
(HPC) on U4 on the control board. Resistors R64, R57 limit the gate current to the triac and with C33 form a snubber for  
the triac and the optoisolator.  
Transistors Q5 and Q6 are an RS232 level driver for the serial data interface.  
4.4  
PROBE TEMPERATURE VERSUS THERMISTOR RESISTANCE  
TEMP (± 0.2 °C)  
RESISTANCE (W)  
TEMP (± 0.2 °C)  
RESISTANCE (W)  
0
9
7352.8  
4702.2  
1976.6  
1893.3  
1814.4  
1739.2  
1667.2  
1598.2  
1532.9  
1470.6  
36  
37  
38  
39  
40  
41  
42  
43  
44  
60  
1411.3  
1355.0  
1301.0  
1249.2  
1199.6  
1152.3  
1107.3  
1064.5  
1023.1  
560.3  
28  
29  
30  
31  
32  
33  
34  
35  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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12  
5.0 CALIBRATION______________________________________________  
5.1  
INTRODUCTION  
Calibration should be performed after any servicing involving the printed circuit boards. After calibration, perform a  
performance check as outlined in § 6.0.  
Note: For instructions on disassembly of the unit, refer to § 7.0.  
Calibration is facilitated by entering a special Calibration mode. See Appendix A1.  
There are only two adjustments VR4 (the 41 °C comparator stage) and VR5 ( setting of the span of the A to D converter).  
This calibration procedure may be carried out if the unit is thought to be out of calibration (E0x to E7x error messages in  
the display) or if any of the circuit boards have been replaced or repaired. In particular any repair that may have altered  
the potential of the ± 5 V rails or component change associated with the A to D converter would require a calibration  
check.  
Calibration should be checked and performed after the unit has been running for at least twenty minutes; ie after the unit  
has warmed up.  
5.2  
5.3  
EQUIPMENT REQUIRED  
¨
41 °C calibration probe, available in MR700 series calibration kit (Fisher & Paykel part no. 900MR548).  
For models with Revision D PCB and earlier:  
¨
¨
Heater Wire module.  
For MR480 only - jumper connector cable, which consists of two easy hooks connected in series with a 100mm  
length of cable and a 22 kW resistor.  
CALIBRATION PROCEDURE FOR MODELS WITH REVISION D PCBS OR EARLIER  
(Before Serial Number 92XXAAA05495) (See § 9.0 for change history).  
1
With models MR730/720/700 ensure that a Heater Wire module is connected, and that the Heater Wire switch is  
on (Heater Wire On LED should be on).  
2
3
Plug in the 41 °C calibration probe.  
Gain access to the adjustment potentiometers VR4 and VR5, by removing the control board from the humidifier  
front panel.  
4
With model MR480 only connect the jumper cable from pin 7 of U10 to the cathode end of D7 on the control  
board.  
5
6
7
With the Chamber Temp button held down turn on the power switch. Display should show -1-  
Using the Chamber Temp button step through to number -4-  
Adjust VR4 slowly so the display just changes from vertical to horizontal bars (|||||| to ===). Back off VR4 and  
recheck that VR4 is not rotated past this display transition point.  
8
Using the Chamber Temp button step to number -5-  
Remove the 41 °C calibration probe.  
9
10  
Adjust VR5 for a display reading of zero. ( 0)  
(This value may drift over time. A deviation of up to ± 2.0 will not affect circuit performance.)  
Calibration is complete; do performance check (§ 6.0).  
11  
5.4  
CALIBRATION PROCEDURE FOR MODELS WITH REVISION F PCBS OR LATER  
(See § 9.0 for serial number details)  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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1
2
Plug in the 41 °C calibration probe.  
Gain access to the adjustment potentiometers VR4 and VR5, by removing the control board from the humidifier  
front panel.  
3
4
5
With the Chamber Temp button held down turn on the power switch. Display should show -1-  
Using the Chamber Temp button step through to number -4-  
Starting with a vertical bar display adjust VR4 so the display changes to an all 8 display. If VR4 is rotated too  
far the display becomes all horizontal bars (||.||.||. thru 8 .8 .8 . to ===). The correct point is where all the  
segments of the all 8 display are of equal brightness.  
6
7
8
Using the Chamber Temp button step to number -5-  
Remove the 41 °C calibration probe.  
Adjust VR5 for a display reading of zero. (0)  
(This value may drift over time. A deviation of up to ± 2.0 will not affect circuit performance.)  
Calibration is complete; do performance check (§ 6.0)  
9
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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6.0 PERFORMANCE CHECK_______________________________________  
6.1  
INTRODUCTION  
This procedure should be used to check the operation and calibration of the MR730/720/700/480. This performance  
check should be performed after any servicing, and annually as part of the routine maintenance procedure (see  
Appendix B).  
Performance can be monitored during the test by using the functions of the Engineering Menu. See Appendix A2.  
If there is a desire to confirm the full dynamic operation of the Humidifier, such as after servicing, a full test of the  
temperature control of the Humidifier may be performed, see tests detailed in Addendix E.  
6.2  
PERFORMANCE CHECK MR730/720/700  
6.2.1 EQUIPMENT SETUP NOTES:  
¨
¨
34.5 °C and 41°C test probes, available in MR700 series calibration kit (Fisher & Paykel part no. 900MR548).  
A heated wire breathing circuit of any length, single use or reusable.( If a single use circuit is used, ensure there is a  
gas flow through it of at least 2 l/minute to prevent overheating of the circuit.)  
Heater wire adaptor for connection to a MR700 series humidifier  
A Humidification Chamber filled with water to recommended level (water at room temperature.)  
A temperature probe is not used in the circuit in this test.  
¨
¨
¨
6.2.2 SETUP  
1
Connect the heated circuit to the humidifier , ensure the circuit is not covered to prevent overheating of the  
tubing. Remember there must be an airflow of at least 2 l/min for single use circuits.  
2
3
4
Plug in the 34.5 °C test probe to the humidifier.  
Slide the humidification chamber on to the humidifier.  
Plug in the humidifier and turn the power on. For the MR720 and MR730, ensure the heater wire switch is ‘on’  
(heater wire LED will light).  
6.2.3 TEMPERATURE CONTROL CHECK MR700/720/730  
1
2
Turn the Temperature Control knob to 33.0 ± 0.2 °C and Chamber Control to 0. (Note the Temperature Control  
and Chamber Control settings will be displayed as the control knobs are adjusted.  
Check the display reads 34.5 ± 0.2 °C and that the ‘Set Low’ warning light is on (units with version 3 software  
only).  
3
4
5
Push the Chamber temp. button and check for a 34.5 ± 0.2 °C reading on the temperature display.  
Run for 5 minutes without interruption.  
After 5 minutes Check:  
Heaterplate is warm or cold.(Less than 60 °C , see ‘hP’ in the engineering menu).  
Heater Wire cold (feel the wire or circuit, should be cold to touch).  
6
7
8
Turn the Temperature Control knob to 36.0 ± 0.2 °C and leave Chamber Control set at 0.  
Run for at least 20 minutes without interruption.  
After 20 minutes Check:  
Heaterplate hot (Greater than 80 °C, see ‘hP’ in the engineering menu.  
Heater Wire hot (feel the wire or circuit, should be warm to touch).  
CAUTION: THE WATER IN THE CHAMBER MAY BE NEAR BOILING AT THIS STAGE  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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6.2.4 ALARMS CHECK MR700/720/730  
1
Rotate Temperature Control knob to 37 and check for an Airway Temperature Low alarm. (For an MR720 set to  
40 °C and check for an Airway Temperature Low alarm).  
2
3
Rotate Temperature Control knob to 32 and check for an Airway Temperature High alarm.  
If ‘set low’ light is not already on, rotate the chamber control to -1.5 and check that the ‘set low’ light comes on  
(all software versions).  
4
5
6
Rotate the Temperature Control knob back to 36 and check that alarms cease and set low LED is off..  
Disconnect the Heater Wire plug and check for audio alarm and Heater Wire alarm light.  
Reconnect the heater wire. For MR720/730 models, turn the Heater Wire off and check for audio alarm and  
Heater Wire alarm light.  
7
8
Disconnect the 34.5°C temperature probe and check that the Temperature Probe LED flashes and gives an  
audio alarm.  
Insert the 41°C temperature probe into the humidifier and check that the Airway Temperature High LED flashes  
and the audio alarm sounds.  
9
Push the Mute button and check that the audio alarm is silenced  
10  
Go to the engineering menu and check that the heaterplate duty cycle (Cdc) and heater wire duty cycle (Edc)  
are starting to decrease, this may take a few seconds.  
11  
12  
Turn off the humidifier.  
Humidifier is now ready for service.  
6.3  
PERFORMANCE CHECK (MR480)  
6.3.1 EQUIPMENT REQUIRED  
¨
¨
34.5 °C and 41 °C test probes, available in MR700 series calibration kit (Fisher & Paykel part no. 900MR548).  
A Full Humidification Chamber  
6.3.2 SETUP  
1
Slide the humidification chamber on to the heaterbase.  
6.3.3 TEMPERATURE CONTROL CHECK (MR480)  
1
2
3
4
5
6
7
8
Plug in the 34.5 °C test probe.  
Turn the Temperature Control knob to 32.0 °C.  
Turn on the humidifier main power switch.  
Check that 32.0 ± 0.2 °C flashes on the display during initialisation.  
Check for a display reading of 34.5 ± 0.2 °C after initialisation.  
Push the Chamber Temp. button and check for a reading of 34.5 ± 0.2 °C.  
Run for 5 minutes without interuption. If mains power is interupted test will have to be restarted.  
After 5 minutes check the following in ‘Engineering mode’ (see Appendix A2):  
Set  
hp  
32  
£ 60  
9
Turn off the humidifier.  
10  
Turn the Temperature Control knob to 36.0 ± 0.2 °C (check correct setting is displayed when the control is  
adjusted).  
11  
12  
Run for 25 minutes.  
After 25 minutes check the engineering menu (appendix A2.2):  
Set  
hp  
36  
³ 70  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
16  
6.3.4 ALARMS CHECK - MR480  
1
2
Disconnect the 34.5°C temperature probe and check that the Temperature Probe LED flashes and gives an  
audio alarm.  
Insert the 41°C temperature probe into the humidifier and check that the Airway Temperature High LED flashes  
and the audio alarm sounds.  
3
4
Push the Mute button and check that the audio alarm is silenced  
Go to the engineering menu and check that the heaterplate duty cycle (dc) is starting to decrease, this may take  
a few seconds.  
5
6
Turn off the humidifier.  
Humidifier is now ready for use.  
6.4  
DUAL PROBE TEMPERATURE TEST  
This test is recommended to be performed on all temperature probes every three months or if there is any doubt as to the  
accuracy of the temperature probe. This test allows the operator to compare the temperature readings of both probes  
(chamber and airway) firstly to one another, and secondly to a glass thermometer for absolute verification of temperature  
if so desired. (Using a water bath and thermometer is the most reliable method to check the temperature probe accuracy.)  
6.4.1 EQUIPMENT REQUIRED  
¨
¨
¨
¨
Dual Temperature probe to be tested.  
Glass thermometer accurate to ±1°C.  
Cup of warm water (Ambient to 40 °C).  
Heater wire if using humidifier in heater wire mode.  
6.4.2 TEST PROCEDURE  
1
Plug the dual probe plug into the Humidifier, if in Heater Wire mode ensure a heater wire assembly is  
connected.  
2
3
Turn on the mains power.  
Insert both temperature probes into a container filled with water at a temperature between ambient and 40 °C.  
As temperature gradients can be quite large it is recommended that the two probes be held together with a  
rubber band during this test and the water constantly stirred.  
4
5
Place the thermometer in the water alongside the probes and allow two minutes for the temperatures to  
stabilise. It is recommended that the water be constantly stirred during this test.  
Enter the Engineering menu (refer Appendix A2) and select ‘CP’ (compare probes) option. The display will  
alternate between the airway and chamber temperatures (chamber temperature is displayed with all decimal  
points turned on).  
6
7
Check the temperature difference between chamber and airway probes as indicated by the display, it should not  
exceed 1.5 °C.  
Ensure that the temperature reading of the chamber and airway probes are both within 1.5 °C of the  
thermometer reading.  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
17  
7.0 SERVICING INFORMATION _____________________________________  
7.1  
INTRODUCTION  
This section provides information for servicing the MR730/720/700/480 Humidifier. The electronic circuitry is contained  
on two separate circuit boards, the power board and control board.  
Please note the following:  
Follow ESD precautions when handling circuit boards.  
After replacing or modifying a circuit board, go through the calibration and performance tests outlined in § 5  
and 6.  
After any repair involving opening of the humidifier, go through the electrical safety tests outlined in Appendix  
B2.  
When replacing any screws, refer to torque settings in § 7.6.  
7.2  
PRINTED CIRCUIT BOARD REMOVAL  
7.2.1 CONTROL PCB  
The front panel and heaterplate assembly is separated from the humidifier body by removing the 4 fixing screws from the  
rear of the humidifier body. The front panel assembly can now be moved aside and the two ribbon cable connectors (J1  
and J2) disconnected from the rear of the control board. If the front panel is now positioned face down the three plastic  
retaining latches protruding through the board can be moved in the appropriate direction to release the board. This is  
facilitated if a slight upward finger pressure is maintained on either edge of the board, when the latches release, the  
board will pop up leaving the push on control knobs behind in the front panel.  
7.2.2 POWER PCB  
Separate the case front from the humidifier body and disconnect the two ribbon cable connectors joining the Power PCB  
and Control PCB (J1 and J2). Cut the cable tie holding the heaterplate and chassis wires together.  
The power board and heat sink assembly can now be removed by flexing the case sides away from the top edge of the  
board and moving the board forward slightly to disengage from the case. The board should now be lifted slightly to  
clear the lower retaining guides and moved further forward to gain access to the various wiring harness connectors  
which can now be detached. Before removing the PCB, unscrew the mains cord connections and cut the cable tie  
holding the mains cord in place.  
7.3  
COMPATABILITY  
7.3.1 HARDWARE COMPATABILITY  
·
·
If a revision D or earlier power or control PCB needs to be replaced, then both PCBs need to be upgraded together  
to ensure correct performance. Revision F and later PCBs can be replaced individually.  
To upgrade both PCBs and the software use a PCB service upgrade kit. The part numbers to order are as follows:  
Model  
MR480  
MR700  
Part number  
043040791  
043040792  
Model  
MR720  
MR730  
Part number  
043040793  
043040794  
·
·
For humidifiers with Rev F or later PCBs, you will only be required to purchase individual boards for repairs (as detailed in sect. 8.9).  
If a revision H or later power PCB needs replacing, the replacement power PCB must also be revision H or later.  
Replacing revision F or earlier power PCB MR700/720/730  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
18  
If you are fitting a Revision H or later power PCB to a Humidifier that has a revision F or earlier control PCB , you  
will have to ensure correct phase polarity on the transformer secondary wires. To check for correct polarity, turn the  
humidifier on, if the humidifier displays F-2, then the polarity of one of the transformer secondaries needs to be changed.  
This is accomplished as follows:  
i.  
Unplug the power supply and then unplug the transformer secondary connector (Connector J9) from the power  
PCB.  
ii.  
Then carefully remove the two yellow wires from the connector housing by depressing the locking tabs on the  
back of the connector terminals and pulling the wires out of the housing.  
iii.  
Insert the yellow wires in to the connector housing in reverse order to what they were before. See below.  
SECONDARY  
YELLOW  
EXISTING WIRING  
YELLOW  
WHITE  
WHITE  
J9  
YELLOW  
SECONDARY  
NEW WIRING AFTER  
YELLOW  
WHITE  
WHITE  
POLARITY SWAPPED  
J9  
Replacing revision F or earlier power PCB MR480  
If the existing power PCB is Rev. F or earlier, there will be an earth wire from the secondary harness of the transformer to  
the chassis. Unclip this wire from the transformer connector and unscrew it from the chassis. The Rev. J replacement  
power PCB will have an earth wire attached to the PCB. Fit the end of this earth wire to the earth stud on the chassis.  
7.3.2 MR480 TRANSFORMERS  
For MR480’s , the transformer secondary wiring changed when Rev. J PCB started. When replacing the transformer,  
follow the instructions supplied in the transformer replacement kits to ensure compatability.  
7.3.3 SOFTWARE COMPATABILITY  
Software versions 1.0 and 2.0 can be upgraded to version 3.0 in their existing PCBs.  
Software version 1.0 should be replaced with version 3.0 if the PCB’s are upgraded. Software versions 2.0 and 3.0 are  
compatable with all PCB revisions.  
7.4  
HEATERPLATE  
To reset the 118 °C over temperature cutout, separate the case front from the case body, then push the reset button  
(through a small hole under the heaterplate in the front panel case assembly).  
To replace the heaterplate:  
1
2
3
4
5
Separate the case front from the humidifier body.  
Unclip the Power PCB from the case body (see § 7.2.2 above).  
Unplug the heaterplate wires from the Power PCB (connectors J3 and J7).  
Unscrew the earth screw on the chassis for the heaterplate earth wire.  
Unplug the ribbon cables from the Power PCB to the Control PCB (connectors J1 and J2). The front case  
assembly is now separate from the case body.  
6
7
Detach the heaterplate from the case front by unscrewing the three screws which secure it to the case front.  
Assembly is the reverse of the above procedure.  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
19  
7.4.1 HEATERPLATES WITH SCREW-IN STANDOFFS  
For products after S/N:9773XXX19731, the heaterplate standoffs were changed to shoulder bolts that screwed directly  
into the heaterplate.  
When fitting these heaterplates,‘click’ the heaterplate springs into the recesses on the heaterplate (by rotating them  
while pushing down), then align the springs with the holes in the case front and screw in the self tapping standoffs into  
the heaterplate.  
7.5  
FAULT LOCATION  
If neither the digital display nor any of the front panel LED’s are on and no power appears to be reaching the  
transformer primary, check that the mechanical overheat protector on the heaterplate has not cut out. This may be  
checked by depressing the red reset button. (See § 7.4).  
Determine if all power supplies are operational and all fuses are intact. If the power supplies are OK but the display is  
blank, check the watch dog output (pin 12, U5g). A high output here will blank the display, turn on the humidifier fault  
LED indicator and isolate the heater circuits but not necessarily stop the processor. Check for the presence of a 33 to 40  
ms period square wave at PB7 (pin 1 U5b). If the watch dog output is high and the 33 to 40 ms clock is present a fault in  
the watch dog circuitry is indicated but if port PB7 is not changing state there is a fault elsewhere.  
7.6  
SCREW TORQUE SETTINGS  
Below is a guide to screw torques used on the humidifier, use this as a guide for tightening of screws on the humidifier  
(exact torques are not required).  
Ref  
Screw  
Application  
Driver  
Torque(in/oz)  
Torque  
(Nm)  
CHASSIS  
14  
18  
21  
22  
26  
27  
Screw #8 x ½" Pan Phil TY25 S/S  
Case Front/Body  
Phillips  
Phillips  
Allen  
85-113  
0.6 to  
0.8  
Screw M4 x 8 Pan Phil Taptite  
Screw M6 x 25 Csk Allen S/S  
Screw M4 x 14 Pan Pozi Taptite  
Chassis Earth Screws  
Mounting Bracket  
Mains Cord Clamp  
Chassis Earth Screw  
Heaterplate Standoffs  
240-270  
248-276  
198-240  
248-276  
99-113  
1.7 to  
1.9  
1.75 to  
1.95  
Pozidriv  
e
1.4 to  
1.7  
Screw M6 x 16 Allen S/S Button  
Head  
Allen  
1.75 to  
1.95  
Screw M3 x 5 Pan Phil Taptite  
Phillips  
0.7 to  
0.8  
HEATERPLATE  
2
5
Screw M4 x 8 Pan Phil Taptite  
Heaterplate  
Phillips  
Phillips  
212-254  
99-113  
1.5 to  
1.8  
Earth/Element  
Thermistor/Thermostat  
Heaterplate  
Screw M3 x 5 Pan Phil Taptite  
0.7to 0.8  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
20  
8.0 SCHEMATICS, PART LISTS AND MECHANICAL DRAWINGS________________  
8.1  
MR700 SERIES CIRCUIT LAYOUT BLOCK DIAGRAM  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
21  
8.2  
COMPONENT LAYOUT - REVISION H AND J PCB  
Power Board  
Control Board  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
22  
8.3  
COMPONENT LAYOUT - REVISION F PCB  
Power Board  
Control Board  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
23  
8.4  
LINK PAD LOCATIONS FOR PROGRAMMING CONTROL OPTIONS - REVISION H AND J PCB  
Link Pads  
Control Board(viewed from solder side)  
Location of Link Pads for Programming Control Options (see Appendix A3)  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
24  
THIS PAGE LEFT BLANK  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
25  
8.5  
CIRCUIT DIAGRAMS - REVISION H AND J PCB  
CONTROL PCB  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
26  
8.6  
CIRCUIT DIAGRAMS - REVISION H AND J PCB  
POWER PCB  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
27  
8.7  
CIRCUIT DIAGRAMS - REVISION F PCB  
CONTROL PCB  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
28  
8.8  
CIRCUIT DIAGRAMS - REVISION F PCB  
POWER PCB  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
29  
8.9  
ELECTRICAL PARTS LIST  
The electrical components listed below are referenced in accordance with the component layout and the circuit diagrams  
(see § 8.2 to 8.8).  
Note: The Control and Power PCB Assemblies listed below are replacement parts for Revision F & later PCBs. For  
replacement of Revision D PCBs refer to § 7.3 for details of upgrade kits.  
8.9.1 CONTROL BOARD COMPONENTS: (REVISION H AND LATER PCBS)  
Ref  
Description  
Part No.  
Control PCB Assembly MR480 (No Eprom) ............................................ 043040679  
Control PCB Assembly MR700 (No Eprom) ............................................ 043040633  
Control PCB Assembly MR720 (No Eprom) ............................................ 043040677  
Control PCB Assembly MR730 (No Eprom) ............................................ 043040675  
Eprom Programmed MR480 Ver 3.0 ........................................................... 362040076  
Eprom Programmed MR700 Ver 3.0 ........................................................... 362040077  
Eprom Programmed MR720 Ver 3.0 ........................................................... 362040078  
Eprom Programmed MR730 Ver 3.0 ........................................................... 362040079  
C1, C3,  
C4, C5, C9, C10, C11  
C2  
C12, C13  
C14, C15, C16  
C17  
C18, C19, C20  
C22, C23  
Cap. Ceramic 100 nF 50 V............................................................................ 312040153  
Cap. Mylar 100 nF 50 V............................................................................... 316040085  
Cap. Ceramic 22 pF 50 V.............................................................................. 312040130  
Cap. Elec. 10 µF 25 V.................................................................................... 311040663  
Cap. Ceramic 1 nF 50 V................................................................................ 312040107  
Cap. Ceramic 22 nF 50 V.............................................................................. 312040116  
Cap. Mylar 10 nF 50 V................................................................................. 316040084  
Cap. Ceramic 470 pF 50 V............................................................................ 312040118  
C21, C24  
D1, D2, D3,  
D4, D5, D6, D7, D8,  
D9, D10, D11, D12  
Diode 1N4148................................................................................................ 361040155  
Display LED (HDSP5301 or LA6760) ........................................................ 999860001  
14 pin ribbon connector socket ................................................................. 341040357  
LED green...................................................................................................... 361040329  
LED amber/yellow........................................................................................ 361040328  
DSP1, DSP2, DSP3  
J1A, J2A  
LED1, LED3  
LED2,LED4, LED5,LED11  
LED6,LED7,  
LED8,LED9,LED10  
LED red.......................................................................................................... 361040327  
Transistor BC547B....................................................................................... 361040159  
Q1, Q2, Q3, Q4, Q13  
R1, R2, R3, R5, R6,  
R14, R26, R28, R31,  
R36, R39, R41, R43  
R4  
R7, R13  
R8  
R10, R33, R65, R70  
R11  
R12  
R15  
R16  
R17  
R18  
R19, R24, R69  
Resistor 10k 0.25 W 5%............................................................................... 325040284  
Resistor DIL Resistor pack 7/27k 5% ........................................................ 325046010  
Resistor 4k7 0.25 W 5%............................................................................... 325040287  
Resistor 27k 0.25 W 5%............................................................................... 325040319  
Resistor 22k 0.25 W 5%............................................................................... 325040318  
Resistor 180E 0.25 W 5% ............................................................................ 325040309  
Resistor 6k8 0.25 W 5%............................................................................... 325040335  
Resistor 9k09 0.25 W 1% Metal Film......................................................... 325040145  
Resistor 560E 0.25 W 0.5% Metal Film...................................................... 325040135  
Resistor 1k5 0.25 W 0.5% Metal Film........................................................ 325040137  
Resistor 4k7 0.25 W 0.5% Metal Film........................................................ 325040138  
Resistor 2k2 0.25 W 5%............................................................................... 325040282  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
30  
R20  
Resistor 412E 0.25 W 0.5% Metal Film..................................................... 325040152  
R21,  
R22, R23, R27, R29  
R25, R35, R40  
R30  
R32, R63  
R34  
Resistor 820E 0.25 W 0.5% Metal Film..................................................... 325040136  
Resistor 100k 0.25 W 1% Metal Film......................................................... 325040139  
Resistor 220E 0.25 W 1% Metal Film........................................................ 325040134  
Resistor 15k 0.25 W 5% .............................................................................. 325040317  
Resistor 180k 0.25 W 1% Metal Film......................................................... 325040125  
Resistor 22E 0.25 W 1% Metal Film.......................................................... 325040133  
Resistor 2k7 0.25 W 5% .............................................................................. 999012720  
R37, R38  
R42  
SW2, SW3, SW4  
SW5  
SPK1  
Push Switch.................................................................................................. 349040094  
Heater Wire Switch...................................................................................... 349040099  
Audio Transducer CB-12KP ...................................................................... 426040015  
U2  
U3  
U4  
IC Octal Latch 74LS373............................................................................... 999610004  
IC Micro-Processor 8085 ............................................................................ 999630012  
IC Ram I/O Timer 8156................................................................................. 999630003  
or IC Ram I/O Timer 81C55 ......................................................................... 363040415  
IC Hex Inverter 74HC14............................................................................... 363040232  
IC 8 Channel Mux. CD4051B...................................................................... 363040125  
IC Display Driver MM5451N ..................................................................... 363040126  
IC 3×2 Channel Mux. CD4053B.................................................................. 999610003  
IC Quad Operation Amplifier TL074 ......................................................... 363040124  
U5  
U6, U8  
U7  
U9  
U10  
VR1  
VR2, VR3  
VR4  
10k Preset...................................................................................................... 327041591  
5k Potentiometer.......................................................................................... 327041562  
10k Preset Multiturn .................................................................................... 327041565  
50k Preset...................................................................................................... 327041590  
VR5  
XTAL1  
Crystal 6.14 Mhz.......................................................................................... 999820001  
Spacer Heater Wire Switch......................................................................... 693040522  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
31  
8.9.2 POWER BOARD COMPONENTS: (REVISION H AND LATER PCBS)  
Reference  
Description  
Part Number  
Power PCB Assembly MR480 Complete.................................................. 043040678  
Power PCB Assembly MR700/720/730 Complete ................................... 043040637  
C6, C8, C32  
C7, C33  
C25, C27  
C26  
C28, C29  
C30, C31  
Cap. MKT. 100 nF 100 V............................................................................. 311040028  
Cap. Poly 100 nF 250 V................................................................................ 316040073  
Cap. Elec. 470 µF 25 V................................................................................. 999234710  
Cap. Elec. 2200 µF 25 V............................................................................... 311040695  
Cap. Elec. 10 µF 25 V................................................................................... 311040663  
Cap. Ceramic 22 nF 50 V.............................................................................. 312040116  
D13, D14,  
D15, D16, D17, D18  
D19, D20, D21  
Diode 1N4002 ............................................................................................... 361040163  
Diode 1N4148 ............................................................................................... 361040155  
F1  
F2  
Fuse fast acting 1 A (20 × 5 mm) ............................................................... 999830001  
Fuse fast acting 4 A (20 × 5 mm) ............................................................... 999830017  
Fuse fast acting 2 A (20 × 5 mm) for 230 V............................................... 999830009  
Fuse fast acting 3 A (20 × 5 mm) for 115 V............................................... 999830012  
Fuse fast acting 1.5 A (20 × 5 mm) for 230 V............................................ 999830008  
Fuse fast acting 2 A (20 × 5 mm) for 115 V............................................... 999830009  
F3, F4 (MR700/720/730)  
F3, F4 (MR700/720/730)  
F3, F4 (MR480)  
F3, F4 (MR480)  
Q6, Q10, Q12  
Q5  
Q7  
Q8  
Transistor BC547B....................................................................................... 361040159  
Transistor BC557B....................................................................................... 361040156  
IC 5 V Regulator 7805.................................................................................. 999600003  
IC 5 V negative Regulator 79L05 ............................................................... 363040146  
Triac BTA 08-600......................................................................................... 999550011  
Q9, Q11  
U11, U12  
U13  
IC Optocoupler MOC3021 or MOC3022................................................... 367060001  
IC Optocoupler CNY17-2............................................................................ 363040045  
R9  
Resistor 18E 0.25 W 5% .............................................................................. 325040366  
R44, R46, R48, R50,  
R54, R58, R60, R66  
R45, R55, R61  
R47  
Resistor 10k 0.25 W 5% .............................................................................. 325040284  
Resistor 2k7 0.25 W 5% .............................................................................. 999012720  
Resistor 22k 0.25 W 5% .............................................................................. 325040318  
Resistor 120E 0.25 W 5% ............................................................................ 325046034  
Resistor 3k3 0.25 W 5% .............................................................................. 325040303  
Resistor 270E 0.25 W 5% ............................................................................ 325040294  
Resistor 12k 0.25 W 5% .............................................................................. 325040289  
Resistor 180E 0.25 W 5% ............................................................................ 325040309  
Resistor 220E 0.25 W 5% ............................................................................ 325040296  
Resistor 1M 0.25 W 5% .............................................................................. 325052305  
Resistor 100k 0.25 W 5% ............................................................................ 325040139  
R49  
R51, R52  
R53, R59  
R56  
R57  
R64  
R67  
R68  
Fuse Clips ..................................................................................................... 999840001  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
32  
8.10 MECHANICAL PARTS LIST  
The mechanical components listed below are referenced in accordance with the appropriate exploded diagrams following.  
8.10.1 MR480 MECHANICAL PARTS  
Reference  
1
Description  
Part Number  
Heaterplate Assembly 150 W 100 V................................................................................. 043040701  
Heaterplate Assembly 150 W 115 V................................................................................. 043040700  
Heaterplate Assembly 150 W 230 V................................................................................. 043040695  
Clamp Chamber Kit Blank (includes Gasket Ref. 5) ....................................................... 043040829  
Clamp Chamber Kit French (includes Gasket Ref. 5)..................................................... 043040830  
Clamp Chamber Kit German (includes Gasket Ref. 5).................................................... 043040831  
Clamp Chamber Kit English (includes Gasket Ref. 5).................................................... 043040834  
Spring Mounting ................................................................................................................ 662040040  
Guard Chamber Kit ............................................................................................................. 043040709  
Gasket Clamp ....................................................................................................................... 336060126  
PCB Assembly MR480 Control No Eprom...................................................................... 043040679  
Case Front Kit MR480 English ......................................................................................... 043040713  
NOTE, for other Case Front Kits - Specify Model Number eg "Case Front Kit  
2
3
4
5
6
7
MR480AGM"  
8
9
Knob Control....................................................................................................................... 281150393  
Case Door Right.................................................................................................................. 693040473  
Switch Harness Assembly ................................................................................................ 043040697  
PCB Assembly MR480 Power Complete......................................................................... 043040678  
Case Foot............................................................................................................................. 693040478  
Case Door Left .................................................................................................................... 693040472  
Mains Cord MR700 USA Hosp Grade 3.3m UL............................................................. 095428157  
Mains Cord MR700 Australian Clear Plug 3.3 m............................................................ 095428159  
Mains Cord MR700 No Plug 3.3 m................................................................................... 095428160  
Mains Cord MR700 French 230 V No Plug 3.3 m........................................................... 095428203  
Mains Cord MR700 Danish Plug 230 V 2.9 m................................................................. 095428204  
Mains Cord MR700 USA Hosp Grade 2 ft 90° Plug UL................................................ 095428205  
Mains Cord MR700 UK Plug 230 V Fused 3.3 m............................................................ 095428214  
Mains Cord MR700 Schuko Plug 230 V 3.3 m................................................................ 095428217  
Mains Cord MR700 Schuko Plug 230 V 3.3 m Earth Lug.............................................. 095428226  
Screw #8 × 1/2" Pan Phil TY25 S/S................................................................................... 614040120  
Case Body kit MR480AEA English - Australasia.......................................................... 043041063  
Case Body kit MR480JHB English/Spanish ................................................................... 043041027  
NOTE: For other Case Body Kits, - Specify Model Number eg "Case Body Kit  
10  
11  
12  
13  
14  
15  
16  
MR480AGM"  
17  
18  
19  
20  
21  
22  
23  
Washer M6 Wavey............................................................................................................ 622040140  
Nut M6 Nyloc ZPS ............................................................................................................. 621040524  
Bracket Transformer........................................................................................................... 641040706  
Screw M4 × 8 Pan Phil ZP Taptite.................................................................................... 614040117  
Bracket Mounting 30mm × 5mm Tongue ........................................................................ 693040491  
Screw M6 × 25 Csk Allen S/S............................................................................................ 614040208  
Transformer Assembly MR480 230 V.............................................................................. 043040551  
Transformer Assembly MR480 115 V.............................................................................. 043040850  
Screw M4 × 14 Pan Phil Taptite Ychr............................................................................... 614040223  
Clamp Cord Small................................................................................................................ 693040476  
Clamp Cord Large ............................................................................................................... 693040477  
Spacer Hose Heater Cord .................................................................................................. 336060064  
Washer M6 Ext Fan Disk Lock Zn/St .............................................................................. 622041013  
Screw M6 × 16 Allen S/S Button Head............................................................................ 614040230  
Lug Earth.............................................................................................................................. 345060096  
Probe Socket Harness Assembly ..................................................................................... 043040698  
Screw M3 × 5 Taptite Pan Phil Ychr................................................................................. 614040116  
Washer Lock M4 Int Zn/Pl................................................................................................ 622040130  
24  
25  
26  
27  
28  
29  
30  
31  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
33  
8.10.2 EXPLODED DIAGRAMS: MR480  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
34  
8.10.3 MR730/720/700 MECHANICAL PARTS  
Reference  
1
Description  
Part Number  
Heaterplate Assembly 150 W 100 V................................................................................... 043040701  
Heaterplate Assembly 150 W 115 V................................................................................... 043040700  
Heaterplate Assembly 150 W 127 V................................................................................... 043040839  
Heaterplate Assembly 150 W 230 V................................................................................... 043040695  
Heaterplate reflector upgrade kit (includes new front case and reflector)  
043042054  
2
Clamp Chamber Kit Blank ( includes Gasket Ref. 5)......................................................... 043040829  
Clamp Chamber Kit French (includes Gasket Ref. 5)........................................................ 043040830  
Clamp Chamber Kit German (includes Gasket Ref. 5)....................................................... 043040831  
Clamp Chamber Kit English (includes Gasket Ref. 5)....................................................... 043040834  
Spring Mounting................................................................................................................... 662040040  
Guard Chamber Kit ................................................................................................................ 043040709  
Gasket Clamp .......................................................................................................................... 336060126  
PCB Assembly MR700 Control No Eprom........................................................................ 043040633  
PCB Assembly MR720 Control No Eprom........................................................................ 043040677  
PCB Assembly MR730 Control No Eprom........................................................................ 043040675  
Case Front Kit MR700 English............................................................................................ 043040710  
Case Front Kit MR700 French/Dutch................................................................................. 043041132  
Case Front Kit MR700 German/French .............................................................................. 043041128  
Case Front Kit MR720 English............................................................................................ 043040711  
Case Front Kit MR720 French/Dutch................................................................................. 043040803  
Case Front Kit MR730 English............................................................................................ 043040712  
Case Front Kit MR730 French/Dutch................................................................................. 043040804  
Case Front Kit MR730 German/French .............................................................................. 043040774  
Case Front Kit MR730 Italian .............................................................................................. 043041243  
NOTE: For other Case Front languages Specify Model Number eg "Case Front  
3
4
5
6
7
Kit for MR720ASU"  
8
9
Knob Control......................................................................................................................... 281150393  
Knob Offset............................................................................................................................ 693040475  
Knob Fixed Offset ................................................................................................................. 693040483  
Case Door Right .................................................................................................................... 693040473  
Switch Harness Assembly ................................................................................................... 043040697  
PCB Assembly (MR730/720/700) Power Complete .......................................................... 043040637  
Case Foot................................................................................................................................ 693040478  
Harness Assembly DB9 (RS232)......................................................................................... 043040699  
Case Door Left ....................................................................................................................... 693040472  
Mains Cord MR700 USA Hosp Grade 3.3 m UL............................................................... 095428157  
10  
11  
12  
13  
14  
15  
16  
Mains Cord MR700 Australian Clear Plug 3.3 m  
Mains Cord MR700 No Plug 3.3 m  
095428159  
095428160  
16  
Mains Cord MR700 French 230 V No Plug 3.3 m.............................................................. 095428203  
Mains Cord MR700 Danish Plug 230 V 2.9 m.................................................................... 095428204  
Mains Cord MR700 UK Plug 230 V Fused 3.3 m.............................................................. 095428214  
Mains Cord MR700 Schuko Plug 230 V 3.3 m................................................................... 095428217  
Mains Cord MR700 Japanese - Right Angle Plug 3.3m  
095428308  
Mains Cord MR700 Schuko Plug 230 V 3.3 m Earth Lug................................................. 095428226  
Screw #8 × 1/2" Pan Phil TY25 S/S..................................................................................... 614040120  
Case Body Kit MR700AFU French/Dutch........................................................................ 043041133  
Case Body Kit MR700ALU Italian/English....................................................................... 043041244  
Case Body Kit MR700AEA Australasia Models ............................................................. 043040989  
17  
18  
Case Body Kit MR700AGM/AGU German Models  
043042058  
Case Body Kit MR700GEU English - Japanese Models .................................................. 043040775  
Case Body Kit MR720AEA Australasia Models ............................................................. 043040990  
Case Body Kit MR720AFU French/Dutch........................................................................ 043040807  
Case Body Kit MR720JHB English/Spanish Baxter......................................................... 043040714  
Case Body Kit MR730AFU French/Dutch........................................................................ 043041134  
Case Body Kit MR730AEU English/French...................................................................... 043040800  
Case Body Kit MR730AEA Australasia Models ............................................................. 043040991  
Case Body Kit MR730AND/ADU Norway/Denmark  
043042055  
Case Body Kit MR730GEU English Japan......................................................................... 043040776  
Case Body Kit MR730AGU German/French ..................................................................... 043040977  
Case Body Kit MR730JEB English/French Baxter............................................................ 043040921  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
35  
Case Body Kit MR730JEU English/French Canadian  
043041335  
Case Body Kit MR730JHB English/Spanish Baxter........................................................ 043040715  
NOTE: For other Case Body types Specify Model Number eg "Case Front Kit  
MR720ASU"  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
Washer M6 Wavey.............................................................................................................. 622040140  
Nut M6 Nyloc ZPS ............................................................................................................... 621040524  
Bracket Transformer............................................................................................................. 641040706  
Screw M4 × 8 Pan Phil ZP Taptite...................................................................................... 614040117  
Screw M4 × 50 Pan Phil ZP.................................................................................................. 614040214  
Nut M4 Nyloc ZPS ............................................................................................................... 621040517  
Bracket Mounting 30 mm × 5 mm Tongue ........................................................................ 693040491  
Screw M6 × 25 Csk Allen S/S.............................................................................................. 614040208  
Insulator Transformer.......................................................................................................... 331040158  
Transformer Assembly (MR700 Series) 100 V.................................................................. 043041289  
Transformer Assembly (MR700 Series) 115 V.................................................................. 043041288  
Transformer Assembly (MR700 Series) 127 V.................................................................. 043040931  
Transformer Assembly (MR700 Series) 230 V (double insulated)................................ 043041287  
Tape Foam Adhesive 3 mm × 10 mm × 60 mm .................................................................. 254040059  
Screw M4 × 14 Pan Phil Taptite Ychr................................................................................. 614040223  
Clamp Cord Small.................................................................................................................. 693040476  
Clamp Cord Large ................................................................................................................. 693040477  
Spacer Hose Heater Cord .................................................................................................... 336060064  
Washer M6 Ext Fan Disk Lock Zn/St ................................................................................ 622041013  
Screw M6 × 16 Allen S/S Button Head.............................................................................. 614040230  
Lug Earth................................................................................................................................ 345060096  
Screw M3 × 5 Taptite Pan Phil Ychr................................................................................... 614040116  
Washer Lock M4 Int Zn/Pl.................................................................................................. 622040130  
Harness J10-Hose & Socket Heater Wire Kit ................................................................... 043040961  
Probe Socket Harness Assembly ....................................................................................... 043040698  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
38  
Cap for probe socket  
693041379  
185041088  
185041147  
185041144  
185041145  
185041324  
185041146  
185041334  
185041331  
185041333  
185041332  
185041148  
185041335  
Instruction swing tag English  
Instruction swing tag French  
Instruction swing tag German  
Instruction swing tag Italian  
Instruction swing tag Dutch  
Instruction swing tag Spanish  
Instruction swing tag Portugese  
Instruction swing tag Swedish  
Instruction swing tag Finnish  
Instruction swing tag Norwegian  
Instruction swing tag Japanese  
Instruction swing tag Danish  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
36  
8.10.4 EXPLODED DIAGRAMS: MR730/720/700  
Download from Www.Somanuals.com. All Manuals Search And Download.  
37  
8.10.5 HEATERPLATE ASSEMBLY PARTS (MR730/720/700/480)  
Reference  
Description  
Part Number  
1
2
3
4
Reflector (added after 01/01/99)....................................................................................... 641040829  
Screw M4 × 8 Pan Phil Taptite ......................................................................................... 614040117  
Cover Element Plate........................................................................................................... 641040707  
Element Assembly 230 V 150 W ...................................................................................... 043040893  
Element Assembly 127 V 150 W ...................................................................................... 043040833  
Element Assembly 115 V 150 W ...................................................................................... 043040894  
Element Assembly 100 V 150 W ...................................................................................... 043040895  
Screw M3 × 5 Taptite Pan Phil Ychr................................................................................ 614040116  
Insulator Element ............................................................................................................... 331040114  
Thermistor and Harness Assembly................................................................................. 095428156  
Plate Heater......................................................................................................................... 043040875  
Harness Heaterplate - Earth.............................................................................................. 095428154  
Washer Lock M4 Int Zn/Pl............................................................................................... 622040130  
Thermostat 118 Degree Centigrade................................................................................. 349040052  
Harness J7 - Heaterplate ................................................................................................... 095428279  
5
6
7
8
9
10  
11  
12  
NS  
NS  
Screw in style standoffs  
336060143  
043042054  
Reflector upgrade kit (includes new front case)  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
38  
8.10.6 EXPLODED DIAGRAMS:HEATERPLATE ASSEMBLY MR730/720/700/480 (INVERTED VIEW)  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
39  
8.11 PCB IDENTIFICATION DIAGRAM  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
40  
8.12 POWER PCB HARNESS CONNECTION DIAGRAM  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
41  
9.0 PRODUCT CHANGE HISTORY ___________________________________  
This change history details changes which may have significance for servicing. It does not include changes that are  
insignificant to users or service technicians. Refer also to change panel on circuit diagrams.  
DATE  
CHANGE  
NUMBER  
FIRST SERIAL  
NUMBER  
COMMENTS  
Introduction of Version 2.0 Software.  
AFFECTED  
92XXAAA02786  
29/06/92  
1056  
·
·
·
·
Changes from Version 1.0 are:  
Delay on chamber temperature display.  
Sensitivity of control knobs increased.  
Auto standby mode for MR720.  
(Note: this change not introduced on AF- and AG- models  
until serial number 93XXAAA01818, excluding AGM models).  
Enhanced 41 °C calibration - with introduction of Rev F PCB.  
Note: this change not introduced on AF- and AG- models until serial  
number 93XXAAA01818).  
Introduction of Version 2.0 Software on AF- and AG- models.  
Note: this change not introduced on AGM models.  
C7 added, R57 changed to 390E from 1k2.  
03/08/92  
22/01/93  
1019  
1363  
92XXAAA05495  
93XXAAA01818  
25/01/93  
7/06/94  
1100  
1992  
93XXAAA02582  
9473JES08020 (1)  
Version 3.0 software started.(All countries except Japan and German)  
Changes from version 2.0 are:  
·
·
·
·
Standby mode times out after 30 minutes (was 20).  
Low temperature alarm in warm up mode activated sooner.  
Set low indicator alarm changed.  
Display during A to D calibration improved.  
12/10/94  
22/08/94  
15/12/94  
17/02/95  
3/07/95  
9/08/95  
1/10/95  
2088  
2079  
2161  
2313  
2469  
2433  
2443  
9473AGU17549  
9473AGM14257  
9473GES22496  
9573GEU03084  
9541JHB10757  
9573JHB12155  
9573AEA15923  
AGU AND AGT Models to version 3 software.  
MR730AGM to version 3 software.  
MR730GES to version 3 software .  
MR730GEU to version 3 software.  
Electroless nickel plating on heaterplate started.  
Changed recommended settings on front fascia panel to 39, -2.  
Introduction of Rev H PCB on MR700/720/730. Change Molex  
connectors style on power PCB.  
01/4/97  
23/5/97  
3212  
3303  
9773XXX08041  
9748XXX10692  
Introduction of Revision J PCB on MR700/720/730.  
MR480: Introduce Revision J PCB. Transformer secondary wiring  
changed (earth wire removed). Earth wire added to PCB.  
Heaterplate standoff style changed to shoulder bolts.  
Heaterplate surface changed to Anodised  
30/5/97  
01/01/98  
01/01/99  
3308  
3934  
4371  
9773XXX19731  
9973XXX00001  
2000-73XXX00001 Reflector added to underside of heaterplate  
For software and hardware compatability see § 7.3.  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
42  
9.1  
MODEL NUMBER EXPLANATION  
eg MR730AEU (model type MR730, with specific variations as below).  
The table below lists variations in models that are for general sale, there are some models which are sold to specific  
customers that are not shown here.  
First Letter  
Voltage  
Second  
Letter  
Third  
letter  
Front Panel Language  
Side Panels Language  
A
P
J
230 ± 25 V  
127 ± 10 V  
115 V  
D
E
F
G
H
J
English  
English  
French/Dutch  
German/French  
English  
Japanese  
Italian  
Spanish/Portugese  
Swedish  
English/German  
English/French  
French/Dutch  
G
100 ± 10 V  
English/German  
English/Spanish  
English/Japanese  
English/Italian  
Spanish/Portugese  
Swedish/Finnish  
Danish/Norwegian  
Danish/English  
L
S
W
D
D
N
P
M
N
U
U
U
U
Danish  
Danish  
Swedish/Finnish/Norwegian  
Polish  
Swedish/Finnish/Norwegian  
Polish/English  
R
Russian  
Russian/English  
9.2  
SERIAL NUMBER EXPLANATION  
92  
XX  
AAA  
XXXXX  
YEAR  
MODEL  
CODE  
SERIAL NUMBER  
41 MR410  
48 MR480  
70 MR700  
72 MR720  
73 MR730  
Three letter code is as per above specification.  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
43  
APPENDIX A___________________________________________________  
A1  
CALIBRATION MODE  
Entry to the calibration mode is made by holding down the ‘Chamber Temp’ button and turning on the Mains Power  
switch.  
After a two second delay the display should show ‘-1-’.  
On releasing the ‘Chamber Temp’ button the display will show the humidifier model number (730/720/700 or 480).  
The ‘Chamber Temp’ button is now used to step between functions as shown below.  
1
2
3
4
5
Model number display.  
Software version display.  
Traceability number.  
41.0 °C comparator calibrate. VR4.  
ADC zero calibrate. VR5.  
On pushing the ‘Chamber Temp’ button the display will show the present function number then after a one second  
delay step to the next higher function number, where if the ‘Chamber Temp’ button is then released then that function is  
entered  
The calibration mode will time out (to normal operating mode) 5 minutes after the last ‘Chamber Temp’ button push. The  
normal exit mode is to turn the humidifier mains power switch off then on again.  
For details on 41.0 °C and ADC zero calibration procedures refer § 5.3.  
A2  
ENGINEERING MENU  
To enter the engineering menu push the Mute and ‘Chamber Temp’ buttons simultaneously and hold for at least 1.5  
seconds. At this time the display will show SET (for set temperature display) as a pointer to that function and on release  
of the ‘Chamber Temp’ button the display will show the set Temperature Control temperature setting to one decimal  
place. To maintain this display, the Mute button should be kept depressed. If the Mute is released, the display will  
revert to normal operation in about 6 seconds.  
The display can be stepped through the engineering menu in two ways.  
·
If the Mute is held down constantly the functions can be selected sequentially by pressing the ‘Chamber  
Temp’ until the display changes to the next function pointer, where if the ‘Chamber Temp’ button is then  
released the display will show that function.  
·
Releasing the mute button the humidifier will automatically step through the menu until either the mute button  
is pressed whereupon the display will show that function or if 6 seconds has elapsed and the humidifier will  
display ‘End’.  
If ‘End’ appears on the display and the Mute button is momentarily pushed the time out will be inhibited and the  
stepping through the function pointers continued.  
A2.1  
ENGINEERING DISPLAY FUNCTIONS: HEATER WIRE MODE  
SET  
OFF  
Edc  
Cdc  
hP  
L
CP  
Ei  
Set temperature display (°C).  
Offset temperature display (Chamber Control) (°C).  
Heater wire duty cycle (%).  
Heaterplate duty cycle (%).  
Heaterplate temperature (°C).  
Programming link status.(L1, L2, ... L6).  
Compare probes (Probe test).  
Heater wire integral.  
Ti  
Heaterplate integral.  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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44  
A2.2  
ENGINEERING FUNCTIONS: NON HEATER WIRE MODE  
SET  
dc  
hP  
L
CP  
i
Set temperature display (°C)  
Heaterplate duty cycle (%)  
Heaterplate temperature (°C)  
Programming link status  
Compare probes (Probe test)  
Heaterplate Integral  
A2.3  
INTEGRAL DISPLAY  
The integral is an error offset signal which constantly accrues to compensate for the temperature difference between the set control and probe. It is displayed in the Ei’ and ‘Ti’  
engineering functions in hexadecimal notation, ie. the count progresses from 0 to 9 then continues through A b c d E F before cycling back to 0. A negative integral is indicated by  
the three decimal points’ in the display being lit. The magnitude of the integral is ± EFF (± 3839 in decimal notation).  
A3  
PROGRAMMING CONTROL OPTIONS  
The following options can be enabled by joining the pads on the control PCB as shown.  
x = don’t care.  
1 = link.  
0 = no link.  
L1  
x
L2  
x
L3  
0
ISO draft standard audio alarm.  
x
x
1
Gliding tone audio alarm.  
1
1
0
0
0
1
1
0
x
x
x
x
50 °C maximum temperature Heaterplate.  
80 °C maximum temperature Heaterplate.  
90 °C maximum temperature Heaterplate.  
110 °C maximum temperature Heaterplate.  
The state of the above links can be displayed in the engineering menu (‘L’).  
The factory default settings are for the ISO alarm and 110 °C heaterplate, except MR720 which has an 80 °C heaterplate.  
A4  
ERROR CODES  
During operation, if the microprocessor U3 does not receive an expected interrupt within a given time window an error  
condition will be flagged. In particular the RST6.5 interrupt which marks the termination of the integration ramp from  
U10-E and also controls the counter in U4 will, in the event of the count exceeding certain limits, generate an error  
message.  
Some of the error indications which can be displayed on the MR700 Series digital display are listed below, with an  
explanation of the possible cause.  
Error Messages  
Ec  
Checksum error (possible failure of U1 EPROM).  
En  
Memory test error (possible failure of U4 RAM).  
EXx  
Where X = 0 through 7, indicating multiplexer stage where error occurred.  
Where x = o or u, indicating ADC overflow error or underflow error, at the indicated multiplexer stage. (ADC  
counts outside the expected range will generate either an under or overflow error).  
b-1  
b-2  
F-2  
---  
The Mute button is on at turn on or has been on for > 5 minutes.  
The Standby button is on (see b-1 above).  
The Heater Wire fuse, F2 is open circuited.  
Temperature sensor probe fault (see Sect.3.1).  
The following errors may occur during the software-driven shorted probe cable test. If the errors do not persist they do  
not necessarily indicate a faulty probe assembly. It is because of conflicting results during the test that a definite  
conclusion cannot immediately be made.  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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45  
Errors EP2 to EP4 can be caused for example by abnormal high differential temperatures on the two thermistors or by  
rapidly changing input temperatures.  
EP1  
EP2  
EP3  
EP4  
Hardware fault; Q13 short not effective.  
Low probe temperature (~0 °C).  
High probe temperature (~70 °C).  
Partial short between the active probe cable conductors.  
A5  
MR700 SERIES HUMIDIFIER SERIAL DATA INTERFACE  
SERIAL DATA FORMAT  
A5.1  
1 byte  
: (semi colon) Marks beginning of data record.  
4 bytes ASCII Temperature Control setting.  
4 bytes ASCII Airway temperature.  
4 bytes ASCII Chamber temperature.  
4 bytes ASCII Heaterplate temperature.  
4 bytes ASCII Heater wire duty cycle.  
4 bytes ASCII Heaterplate duty cycle.  
4 bytes ASCII Chamber Control setting .  
4 bytes *  
2 bytes  
Status information. (1*ASCII 3*binary bytes).  
CR, LF (Marks end of data record).  
Between each of the above lines there is approximately a 50 ms pause before the next line is transmitted. The complete  
data record is repeated every 500 to 600 ms (500 ms on a 60 Hz supply, 600 ms with 50 Hz).  
Data format is RS232 levels, no handshaking, 9600 baud, 8 bits, no parity, with one stop bit.  
Between the semi colon and the line feed there are eight, 4-byte packets of information as shown above.  
In each case the first byte of the packet contains an identification letter from ‘a’ through ‘h’ in ASCII.  
The format of the 3 bytes following the ASCII I.D. is as shown below.  
I.D. a - SET temperature.  
I.D. b - Airway temperature.  
I.D. c - Chamber temperature.  
Range 5.0 to 80.0 °C, decimal point is assumed between 1st and 2nd digits.  
I.D. d - Heaterplate temperature.  
Range 14.0 to 99.9 °C decimal point assumed, 100 to 135°C no decimal point.  
I.D. e - Heater Wire duty cycle.  
I.D. f - Heaterplate duty cycle.  
Range 0 to 100 %.  
I.D. g - Chamber Control Setting.  
Range -5.0 to +2.0 decimal point assumed. Plus or minus sign in leading ASCII byte.  
I.D. h - Status information.  
A5.2  
STATUS INFORMATION  
The ASCII I.D. is followed by three binary bytes giving alarms and error information, see list below:  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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46  
The data record as received should start with an ‘:’ and end with an ‘LF’. Under abnormal operating conditions however  
(when there are ‘E’ messages in the display) some or all of the above packets ‘a’ to ‘g’ can be missing. The status  
information packet ‘h’ will always be present (as long as the micro is running) and will show the error condition.  
When there are error messages in the display, bit 6 of the last status byte will be set high indicating a fatal error  
condition.  
First Byte  
Bit0  
Bit1  
Bit2  
Bit3  
Bit4  
Bit5  
Bit6  
Bit7  
Probe disconnect LED  
Heater Wire disconnect LED  
Airway Temp Low LED  
Airway Temp High LED  
Chamber Temp Low LED  
Chamber Temp High LED  
Chamber Temp Button LED  
Always set high  
Second Byte  
Bit0  
Bit1  
Bit2  
Bit3  
Bit4  
Bit5  
Bit6  
Bit7  
Standby button LED  
Heater Wire operation LED  
Remote Shut Down request acknowledge  
Set Low LED  
Audio alarm muted  
External request acknowledge Heater Wire operation  
External request acknowledge No Heater Wire operation  
Always set high  
Third Byte  
Bit0  
Bit1  
Bit2  
Heaterplate ON  
Heater Wire ON  
Always low  
Bit3  
Bit4  
Always low  
See table  
Bit4  
Bit5  
Model  
MR480  
MR700  
MR720  
MR730  
0
1
0
1
0
0
1
1
Bit5  
See table  
Bit6  
Fatal error  
Bit7  
Always set high  
A5.3  
REMOTE STANDBY  
A constant high input (pin 2 DB9 connector >1.5 V) shuts down the humidifier. Low or open circuit input enables the humidifier. An RSD request signal puts the humidifier into  
the standby mode; i.e. No low alarms active, controlled 40.0 °C heaterplate and 15% Heater Wire duty cycle. On removal of an RSD request the humidifier enters the warm up  
mode. On the MR730/ 720 models the standby LED is also turned on (not flashing).  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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47  
A5.4  
SERIAL DATA INTERFACE CONNECTOR  
A DB9 connector on the side of the humidifier provides the interface connections.  
pin 2  
pin 3  
pin 5  
pin 7  
Remote shut down input (Serial in).  
Serial Data output.  
Humidifier Earth.  
+5 V (30 mA max)  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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48  
APPENDIX B __________________________________________________  
B1  
MAINTENANCE SCHEDULE  
The MR700 series humidifiers operating software continually monitors the performance characteristics of the humidifier reporting any errors and in the event of a fatal error  
terminates operation in a fail safe mode. For this reason preventative maintenance of the humidifier need only be performed at extended intervals.  
The following list of routine checks are recommended to be performed at the intervals stated.  
For each maintenance check fill out a checklist, as given in Appendix B2.  
B1.1  
MONTHLY  
Perform the following:  
1
Check temperature probe for damage to sensor tips, abrasion of the cable or tarnishing of electrical contacts.  
Clean with alcohol on a swab or replace as necessary.  
2
3
Remove and check the reusable hose heater wire (if fitted) for kinks and abrasions. Replace if necessary.  
Check heater wire connector for damage to cable and both end plugs. Check for correct coupling of the plugs  
with their respective sockets on the heater base and heater wire assembly.  
4
5
Check humidifier power cable for damage and replace as necessary.  
Plug probe and heater wire (if fitted) into heater base and switch on. Observe correct operation of power up  
procedure. Check for no immediate alarms and correct display of ambient temperature. Continue to run for at  
least 30 seconds by which time all the relevant internal tests will have been completed. Switch off.  
B1.2  
B1.3  
THREE MONTHLY  
Perform a temperature probe test as outlined in § 6.4.  
ANNUALLY  
Execute a performance check appropriate to the humidifier model as detailed in § 6.0.  
Carry out Electrical Safety checks as per Appendix B2.  
B1.4  
ANNUALLY OR IN ACCORDANCE WITH RELEVANT COUNTRY REGULATIONS  
Carry out Electrical Safety checks, see Appendix B2.  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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49  
B2  
MAINTENANCE SCHEDULE CHECKLIST  
(PHOTOCOPY AND FILE IN MAINTENANCE RECORDS)  
Type of service check:  
q monthly  
q 3 monthly  
q 6 monthly  
q yearly  
Humidifier Serial Number:___________________________  
Step  
Date: ______________  
Method  
Pass  
Fail  
Monthly  
Check Temperature Probe  
Check Reusable Heater Wire  
Check Heater Wire Connections  
Check Power Cable  
Refer Appendix B1.1  
Refer Appendix B1.1  
Refer Appendix B1.1  
Refer Appendix B1.1  
Refer Appendix B1.1  
see § 4.3 and Appendix B  
q
q
q
q
q
q
q
q
q
q
q
q
Perform Self-Test  
Three Monthly  
Annually  
Perform Temperature Probe Test and Check  
Temperature Probe  
Performance Check  
see § 6  
q
q
Electrical Safety Checks - as required  
Method  
Pass  
Fail  
Earth resistance test  
Measure the resistance from the earth pin on the mains plug to:  
i The heaterplate.(0.2 W maximum) (To get a good contact on the  
anodised heaterplate, clip under the front edge of it.)  
q
q
q
q
ii The earth stud on the base of the humidifier(0.2 W maximum).  
Insulation resistance test  
Earth Leakage test  
Use a 500V DC tester to measure the resistance from the phase pin  
on the mains plug to:  
i The heaterplate (10 MW minimum).  
q
q
q
q
q
q
ii The earth stud on the base of the humidifier (10 MW minimum).  
Has to be measured using an electrical safety tester as per IEC601.  
Measure earth leakage with the earth probe of the tester on the  
heaterplate. Earth leakage current is measured at normal operating  
voltage and frequency of supply.  
Should be 0.5 mA maximum in no fault condition.  
Signature:______________________  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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50  
APPENDIX C __________________________________________________  
C1  
TROUBLESHOOTING GUIDE FOR THE MR700 SERIES RESPIRATORY HUMIDIFIERS  
This is a guide to possible corrective action in the case of an humidifier alarm condition or malfunction. It is primarily  
written for humidifiers using heated wire mode. So parts of this guide would not be applicable for the MR480 and MR730  
and MR720 in the heater wire off mode.  
Unless the cause and immediate effects of an alarm condition are understood and assessed to be of no hazard to the  
patient, the humidifier should be immediately switched off and removed from the patient circuit.  
C1.1  
LOW TEMPERATURE  
Condition detected  
Possible cause  
F Action to take  
Temperature less than desired,  
no alarm.  
Humidifier warming up.  
Wait for a few minutes.  
Standby mode switched on.  
Push mode button for 1 second to  
disable standby. Wait 20 minutes (30  
minutes for v3.0 software).  
Temperature probe not in position.  
Gas flow stopped or interrupted.  
Check position of temperature probe in  
the circuit.  
Airway temperature low alarm  
activated.  
Enter standby mode or turn humidifier  
off until gas flow resumed. (Gas flow  
must be resumed before coming out of  
standby mode).  
Set temperature increased by more than Wait for temperature to rise.  
2 °C.  
Temperature probe not in probe  
housing.  
Fit temperature probe.  
Gas flow rate too low.  
Increase gas flow to more than 2 litres  
per minute.  
Too much distance between end of  
heater wire and temperature probe.  
Use longer heater wire or shorten  
inspiratory hose so that distance is  
between 25 (1") and 100 mm (4"), ideally  
30 mm.  
Chamber temperature low alarm  
activated.  
Poor thermal contact between base of  
chamber and heaterplate.  
Check that chamber base and heaterplate  
are clean, smooth and flat. If necessary  
clean or replace. Humidification  
chambers which are not manufactured by  
Fisher & Paykel may not be suitable.  
Temperature probe not inserted at  
chamber outlet.  
Fit temperature probe correctly.  
Heater element needs replacement.  
Gas flow rate too high for chamber  
Send for repair.  
Use correct chamber. Refer to the  
operating instructions for the type of  
chamber used.  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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51  
C.1.2 HIGH TEMPERATURE  
Condition detected  
Possible cause  
F Action to take  
Airway temperature high alarm  
activated.  
Sudden spurious increase in gas flow.  
Wait for temperature to fall below  
threshold.  
Heater wire too close to temperature  
probe.  
Use shorter heater wire or lengthen  
inspiratory hose so that distance is  
between 25 (1”) and 100 mm (4”), ideally  
30 mm.  
Possibly faulty EOH sensor on  
temperature probe (low resistance).  
Check probe, see § 6.4.  
Refill humidification chamber.  
Check probe, see § 6.4.  
Chamber temperature high alarm No water in chamber.  
activated.  
Possibly faulty TOP sensor on  
temperature probe (low resistance).  
C.1.3 TEMPERATURE FLUCTUATING  
Condition detected  
Possible cause  
FAction to take  
High and low temperature  
alarms.  
Ventilation rate too low or too erratic  
for proper humidifier temperature  
control.  
Ventilation rates below about 6 bpm or of  
a highly erratic nature may affect the  
stability of the temperature control.  
Humidifier temperature control  
influenced by external heating or  
cooling such as air conditioner.  
Shield breathing circuit from external  
influence.  
Temperature probes incorrectly  
positioned.  
Check temperature probe position in the  
circuit.  
Possibly faulty temperature probe  
(Could be intermittent short or open  
circuit).  
Check probe, see Section 6.4.  
(Wriggle probe to pick up intermittent  
faults).  
C.1.4 EXCESSIVE WATER IN CIRCUIT  
Condition detected  
Possible cause  
FAction to take  
Excessive water in inspiratory  
circuit due to rainout.  
If in non-heated wire mode, water trap  
not at the lowest point of the circuit.  
Reposition water trap.  
If in heated wire mode, heater wire too  
close to temperature probe.  
Increase distance from heater wire to  
temperature probe so that the distance is  
between 25 (1”) and 100mm (4”), ideally  
30mm.  
Inspiratory circuit being cooled by air  
conditioner.  
Shield circuit from air conditioner or use  
heater wire circuits.  
Chamber control set too high  
Reduce setting.  
Maximum permissible peak flow rate of Use correct chamber. Refer to the  
humidification chamber has been  
exceeded.  
operating instructions for the type of  
chamber used.  
Humidifier chamber tilted.  
Ensure chamber is level.  
Possibly faulty temperature probe (low Check probe, see § 6.4  
resistance).  
Inspiratory heater wire not connected  
in a parallel wired dual circuit.  
Connect inspiratory heater wire.  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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52  
Excessive water in expiratory  
circuit due to rainout.  
Condensation due to cooling in  
Expiratory line.  
Use dual heated circuit.  
Rduce water level  
Water ejected from  
humidification chamber into  
circuit.  
Humidification chamber filled beyond  
maximum water level line.  
Maximum permissible peak flow rate of Ue correct chamber. Refer to the  
humidification chamber has been  
exceeded.  
operating instructions for the type of  
chamber used.  
Humidifier chamber tilted.  
Chamber should be level.  
C1.5  
LOW HUMIDITY  
Condition detected  
Possible cause  
FAction to take  
Low humidity.  
Chamber control set to low.  
No water in humidification chamber.  
Chamber temperature low.  
Increase setting.  
Fill chamber.  
Check heaterplate temperature setting on  
diaplay when humidifier is switched on,  
Chamber base and heaterplate are smooth  
and flat and in good contact. (Chambers  
not made by Fisher & Paykel may not be  
suitable).  
Gas flow rate too high for chamber.  
Check maximum flow rate in to chamber  
operating instructions.  
C1.6  
ALARMS  
Condition detected  
Possible cause  
FAction to take  
Temperature probe alarm (‘---’  
appears on display).  
Temperature probe unplugged.  
Check connetion.  
Temperature probe plug dirty.  
Temperature probe faulty  
Heater wire unplugged.  
Clean plug.  
Replace probe.  
Check connection.  
Heater wire alarm while  
temperature still displayed.  
Heater wire broken.  
Replace heater wire.  
Turn heater wire on.  
Heater wire switch turned off but  
heater wire connected.  
Heater wire switch turned on but heater Turn heater wire off.  
wire not connected.  
Heater wire alarm while ‘F2’  
displayed.  
Internal fuse blown.  
Send for repair.  
41 °C Overheat calibration outside  
limits.  
Check calibration of the 41 °C  
comparator.  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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53  
C1.7  
TEMPERATURE DISPLAY  
Condition detected  
Possible cause  
FAction to take  
No temperature display, no alarm Humidifier voltage rating incorrect.  
lights.  
Select correct voltage rated unit.  
Heaterplate overheat protector  
operated.  
Reset overheat protector.  
Replace transformer.  
Transformer over heat protector  
operated.  
No temperature display, ‘see  
manual’ indicator light on.  
Control PCB fault.  
Check control PCB for water damage.or  
contamination.  
Error code.  
Humdifier failed self test.  
Check control PCB for water damage or  
contamination.  
Check thermistor conection to control  
PCB.  
If new PCB fitted, check correct polarity  
of transformer secondary harness.  
C1.8  
BREATHING CIRCUIT LEAK  
Condition detected  
Possible cause  
FAction to take  
Breathing circuit leak.  
Faulty circuit connections.  
No water bag.  
Check all circuit connections.  
Connect water bag  
Temperature probes incorrectly fitted.  
Chamber filler stopper missing.  
Check connections.  
Put stopper in place.  
C1.9  
EXTERNAL WATER LEAK  
Condition detected  
Possible cause  
FAction to take  
Water leak with reusable  
chamber.  
Chamber O-ring faulty.  
O-ring should be clean and properly  
fitted. Replace if damaged.  
Water leak with disposable  
chamber.  
Chamber used beyond lifespan.  
Replace with new chamber.  
C1.10 LED ON  
Condition detected  
Possible cause  
FAction to take  
An alarm LED is flashing.  
No audible sound - mute switch has  
been pressed.  
Wait three minutes.  
Standby LED is flashing.  
Humidifier is in standby mode.  
Puch button for 1 second to disable.  
Wait 20 minutes (30 minutes for v3.0  
software).  
‘Set Low’ LED is on.  
Chamber control or airway temperature  
control setting too low.  
Re-adjust. Refer to humidifier operating  
manual.  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
54  
C2  
MR700 SERIES FAULT FLOW CHART FOR NO GO CONDITION  
Check Voltage  
Rating Of Unit  
YES  
YES  
Open Unit and check if  
Reset thermal cut out and find reason  
thermal cut out under  
heaterplate has tripped  
for fault  
NO  
NO  
Check for mains voltage  
at Connector J5 on power  
board  
Check mains lead and  
plug  
YES  
Check connectors on power  
board are in correct locations and  
secure, check fuses (F1 - F4),  
check voltage on connector J7of  
power PCB, mains switch on,  
connectors on rear of control  
board and continuity of  
transformer, connector J8-1& 3  
(Primary) and connector J9-1 & 2  
+ 3 & 4 (Secondaries).Check  
voltage on transformer  
BAD  
Repair faulty component  
and test  
secondary J9.  
YES  
GOOD  
Replace power board  
and test  
Assemble and test  
NO  
YES  
Replace control board  
and test  
Perform calibration and  
NO  
performance checks as  
outlined in Sections 3.0 and  
4.0 of the Technical Manual  
before re-instatement of unit  
Return unit for repair  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
55  
APPENDIX D _________________________________________________  
D1  
CLEANING OF HUMIDIFIER HEATER BASES  
These are the recommended cleaners for use with Fisher and Paykel heaterbases as of the time of revision of this technical  
manual. The disinfectants in the list below have been tested to ensure no damage to the outer plastic or metal components of the  
humidifier. If you wish to use a chemical other than these, please contact your local Fisher and Paykel Healthcare supplier.  
Cleaning instructions  
1. Disconnect the humidifier from any electrical outlet.  
2. Clean the humidifier with one of the following recommended disinfectants using a damp cloth:  
Isopropyl Alcohol  
Dy-Gest Iä  
2% w/v Glutaraldehyde (Cidexä )  
Sporicidinä  
Normal dishwashing detergent.  
Follow the manufacturers instructions carefully. Use the correct dilution of the disinfectant.  
DO NOT immerse the humidifier in any liquid.  
3. Wipe the humidifier clear of any cleaning residues before use.  
D2  
CLEANING OF AIRWAY TEMPERATURE PROBES  
(900MR560, 900MR561, 900MR563, 900MR565, 900MR568, 900MR569 & 900MR571)  
Several chemical disinfectants have been tested with the temperature probe types listed above. The chemicals listed below have  
been found to not affect the integrity or performance of these temperature probes: If you wish to use a chemical or sterilization  
procedure other than these, please contact your local Fisher and Paykel Healthcare supplier.  
Cleaning instructions  
1.  
Physically clean the airway temperature probes, removing all visible contaminants.  
2.  
Disinfect the airway temperature probes with one of the following solutions:  
Isopropyl alcohol  
Control 3ä  
Medizymeä  
Pyronegä  
Sporicidinä  
2% w/v Glutaraldehyde(Cidexä ) Solution 2ä  
OR use one of the following sterilization procedures:  
Ethylene oxide sterilization at 55°C (131°F), 80kPa, or  
Hydrogen peroxide gas plasma (Sterrad) sterilization at 10-40°C (50-104°F).  
DO NOT immerse gold-plated electrical connector plug in disinfectant. DO NOT autoclave. DO NOT use  
dishwater detergents or solvents.  
3.  
Wipe the airway temperature probes clear of any cleaning residues before use. Store in a clean manner.  
Cidexä is a registered trademark of Johnson & Johnson Medical Pty. Ltd. North Ryde, NSW, Australia.  
Dy-Gest Iä is a registered trademark of EcoLab Ltd. Hamilton, New Zealand.  
Sporicidinä is a registered trademark of Sporicidin International Ltd, Rockville, MD 20852, USA.  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  
56  
APPENDIX E _________________________________________________  
E1  
ADDITIONAL DYNAMIC PERFORMANCE CHECK OF HUMIDIFIERS  
This procedure is optional and may be used to check the dynamic operation of MR730/720/700 and MR480 humidifiers.  
This performance check can be performed if there is any doubt about the operation of the humidifier, such as after any  
servicing involving the printed circuit boards.  
For normal routine maintenance checks only the tests detailed in Section 6 are required.  
For the Dynamic Tests, the humidifier is controlled from an airway temperature probe to achieve a set temperature.The  
purpose of this test is to show that the humidifier control systems are working to maintain delivered air temperature to  
the set temperature.  
E2  
PERFORMANCE CHECK MR730/720/700  
E2.1  
EQUIPMENT SETUP  
Set up a heated breathing circuit, see typical setup below:  
Setup Notes:  
¨
¨
Patient delivery tubing can be single use or reusable.  
A gas supply of 2 – 10 l/minute to the chamber is recommended, if no gas supply is used, then the breathing tube  
must be 22mm diameter to allow adequate airflow.  
¨
¨
Heater wire assembly can be single use or reusable, dual heated or single limb. Total power less than 60 Watts. If a  
single use circuit is used then an air flow of at least 2 litres/min is necessary.  
Use a dual airway temperature sensor, such as 900MR560.  
¨ Use any Fisher and Paykel humidification chamber, filled with cold water to maximum level.  
E.2.2 SETUP  
1
Slide the full humidification chamber on to the heaterbase.  
2
Insert the middle sensor of the temperature probe into the heater wire module, and the end sensor of the  
temperature probe into the connector at the end of the delivery tube, plug the temperature probe plug in to the  
humidifier .  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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57  
3
4
Connect the Heater Wire cable to the humidifier.  
If a gas supply is used, set to 5- 10 l/minute, if no gas supply used, the breathing tube should be supported  
from the patient end so that it drops vertically over its entire length to the top of the chamber.  
E.2.3 DYNAMIC TEST SEQUENCE (MR730/720/700)  
1
2
3
Turn the humidifier on, ensure the heater wire LED is on for a MR720 or MR730.  
Adjust set temperature to 36.0 ± 0.1 °C and Chamber Control to 0.  
NOTE: At low ambient temperatures (below 22 °C) a low temperature alarm may occur, if this occurs, press mute  
and restart the test , the breathing circuit will eventually warm up and the humidifier will start controlling.  
4
Check after 30 minutes:  
Digital display is 36.0 ± 0.3 °C  
Chamber outlet temperature is 36.0 ± 2.0 °C  
If the unit is alarming or has not reached 36 ± 0.3 °C, press the mute button if necessary and leave for a further  
15 minutes.  
5
Then check the following in ‘Engineering Mode’ (see appendix A2):  
set  
36 ± 0.1 °C  
offset  
Edc  
Cdc  
hp  
0
³ 0  
³ 0  
³ 36 °C  
5
6
If unit passes this test it is controlling correctly and can be put back in use.  
E.3  
PERFORMANCE CHECK (MR480)  
E.3.1 EQUIPMENT SETUP  
Set up a non heated breathing circuit, see typical setup below:  
Setup Notes:  
¨
¨
Patient delivery tubing can be single use or reusable.  
A gas supply of 2 – 10 l/minute to the chamber is recommended, if no gas supply is used, then the breathing circuit  
must be 22mm diameter to ensure adequate airflow.  
¨
¨
Use a dual airway temperature sensor, such as 900MR560.  
Use a Fisher and Paykel humidification chamber, such as a MR200 series, filled with cold water to maximum level (not  
a MR290).  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
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58  
E.3.2 SETUP  
1
2
Fill the humidification chamber with water and slide on to the heaterbase.  
If a gas supply is used, set to 2- 10 l/minute, if no gas supply used, the breathing tube should be supported  
from the patient end so that it drops vertically over its entire length to the top of the chamber.  
3
Insert the middle sensor of the temperature probe into the connector on top of the chamber , and the end  
sensor of the temperature probe into the connector at the end of the breathing tube, plug the temperature probe  
plug in to the humidifier.  
E.3.3 DYNAMIC TEST PROCEDURE (MR480)  
1
2
Turn the humidifier on.  
Turn Temperature Set control to 31.0 ± 0.1 °C, check that correct setting flashes on display after adjustment.  
The airway circuit under the low flow conditions of the test will warm up only slowly and may give a low  
temperature alarm. If this is muted the circuit will eventually warm up and start controlling.  
3
Check after one hour that digital display is 31.0 ± 1.0 °C.  
If temperature is still outside these limits leave the test going for a further 15 minutes.  
4
5
If displayed temperature is within 31.0 ± 1.0 °C, press chamber temp button and check chamber temperature is  
35 to 66 °C.  
In Engineering menu (appendix A2) check:  
hp (heaterplate temperature) > 36 °C  
Set = 31.0 ± 0.1°C  
6
7
8
Check that disconnecting the temperature probe gives an audio alarm and Temp Probe LED flashes.  
Press Mute button and check the alarm is silenced.  
If the Humidifier passes these tests it is controlling correctly and can be returned to use.  
Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001  
Download from Www.Somanuals.com. All Manuals Search And Download.  

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