Honeywell Carbon Monoxide Alarm SN0500 User Manual
SN0500 / SN0501  
REFRIGERANT GAS LEAK DETECTOR  
INSTALLATION / USER GUIDE  
Copyright © 2004 Honeywell Control Systems Ltd.  
All Rights Reserved  
EN1B-0014UK07 R0404  
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GAS LEAK DETECTOR INSTALLATION & USER GUIDE  
1. INTRODUCTION  
The Honeywell Refrigerant Gas Detection sensors, SN0500 (for refrigerant R404a)  
and SN0501 (for refrigerant R410) are used to detect the leakage of refrigerant gas  
and notify a monitoring system or provide a local indication (i.e. audible or visual  
signal).  
Remedial action can then be taken to stop and replace the lost gas.  
2. EXTERNAL CONNECTIONS  
All external connections are made to the motherboard through a cable gland. A cable  
tie should be fitted within 20mm of the cable gland inside the enclosure. The  
connectors will accept wire of 0.5-1.5mm sq.  
Note: Earth connection must be made when using the vented metal enclosure or Exd  
enclosure. The safety of this equipment is dependent on the integrity of the power  
supply and the earthing of the enclosure.  
On power up the sensor may take some time (minutes up to hours) to fully normalize.  
You can monitor this by checking the 0-10V output as it falls towards zero. If during  
this normalisation period the red / yellow LED activates indicating the high / low level  
relay has switched then the reset button (see Fig. 1.) on the sensor must be pushed  
(if in latched position) after normalisation is complete.  
Figure 1. External Connections  
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GAS LEAK DETECTOR INSTALLATION & USER GUIDE  
3. POWER SUPPLY  
The Power supply is connected at Con 1 (see Fig. 1)  
Green LED on - shows power connected.  
Pin 1 = 0V,  
Pin 2 = 12 to 24 VAC or 12 to 30VDC,  
Pin 3 = Earth.  
The 0V (pin 1) on the power supply terminal block (CON 1) can withstand 50V  
AC or DC with respect to the 0V (Pin 1) on the output terminal block (CON 3). If  
this is likely to be exceeded use an isolated power supply.  
On the power supply side 12V is the minimum voltage at the terminals. Power  
consumption is 4W max. It can draw 0.33Amp at 12V, so voltage drop along the  
supply cable should be considered when selecting supply cable, type and length. For  
example, for cable resistance 10ohm/100m allowing for the flow and return total cable  
resistance for 100m is 20ohm and voltage drop along the cable is 6.6V. Minimum DC  
supply then should be 19V.  
If you need to use a cable of greater diameter that 1.5 mm sq, you can use a terminal  
block at each sensor position capable of taking the larger cable and connect from that  
into the CON1 terminal block using 1mm sq wire. Alternatively use local power  
supplies to reduce cable runs and voltage loss.  
4. ANALOGUE OUTPUTS  
Analogue Outputs which indicate the concentration of gas refrigerant in the air, are at  
Con 3 (see Figure 1.)  
A two-core communication cable should be used to connect the outputs to a  
monitoring and control system; a screen is not required.  
Pin 1 = 0V  
Pin 2 = 4-20mA. Load resistance must be less than 400Ω  
Pin 3 = 0-10V.  
Pin 4 = 0-5 V.  
Load resistance must be greater than 100Ω  
Load resistance must be greater than 10KΩ  
When connecting the 4-20mA to the control panel, we suggest using Belden 8761,  
22awg single pair shielded or alternatively an alarm type cable of 7/0.2mm, 22awg.  
EN1B-0014UK07 R0404  
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GAS LEAK DETECTOR INSTALLATION & USER GUIDE  
5. RELAY CONTACTS  
Note: If changing any jumper - power must be removed.  
There are two relays rated up to 1 Amp at 24V DC/AC. The status of the relays is  
jumper selectable.  
Relay 1 at Con 6. Low-level alarm. Yellow LED on when in alarm.  
Normally closed when JP4 link inserted, JP3 link removed, as shown on Fig. 1.  
Normally open when JP3 link inserted, JP4 link removed, as shown on Fig. 1.  
Latching (manual reset by push button located next to CON 7) - Not latching  
(automatic reset) set by JP8 see Fig. 1. for link position.  
Alarm threshold level is set by pot RV1 and can be set by putting a meter between  
TP0 (negative) and TP2 (positive) (below RV1) and adjusting RV1 (scale is 0 to 5V  
e.g. 2.5V is 50% of scale).  
Delayed response time is set at JP1 by inserting the link in the required position.  
Default settings are:  
Position 1: No delay  
Position 2 : 1 Minute  
Position 3 : 5 Minutes  
Position 4 : 10 Minutes  
Note: If changing any jumper - power must be removed.  
Relay 2 at Con 7. High-level alarm. Red LED on when in alarm.  
Normally open/closed when JP5 link inserted, as shown on Fig.1.  
Latching (manual reset by push button located next to CON 7) / Not latching  
(automatic reset) set by JP7 see Fig. 1. for link position.  
Alarm threshold level is set by pot RV2 and can be set by putting a meter between  
TP0 (negative) and TP3 (positive) (below RV2) and adjusting RV2 (scale is 0 to 5V  
e.g. 2.5V is 50% of scale).  
Delayed response time is set at JP2 by inserting the link in the required position.  
Position 1 No delay  
Position 2 1 Minute  
Position 3 5 Minutes  
Position 4 10 Minutes  
Note: If changing any jumper - power must be removed.  
6. GAS DETECTION RANGE  
Gas Detection Range and default settings vary with model and set up, see below for  
sample settings.  
Gas  
R404a  
R410  
Range  
0-1000 PPM  
0-1000 PPM  
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GAS LEAK DETECTOR INSTALLATION & USER GUIDE  
7. STANDARD DEFAULT SETTINGS  
Relay 1 Low-level relay set at 500 PPM, NO, Auto reset mode  
Relay 2 High-level relay set at 900 PPM, NO, Auto reset mode.  
Delays on both alarm outputs are 0 minutes (no delay).  
CON 1: Power Supply input  
Power on indicated by Green LED.  
Supply voltages to be either 12V to 24V AC or 12 to 30V DC  
Power consumption is 4W max at 12V.  
The connectors will accept wire of 0.5-1.5mm² Refer to Section 3 for maximum cable  
run.  
CON 2: Not Used.  
CON 3: Analogue Output  
Pin 1: 0V  
Pin 2: 4-20mA. Load resistance<400Ω  
Pin 3:0-10V. Load resistance>100Ω  
Pin 4: 0-5V. Load resistance>10KΩ  
CON 4: Plug-in detection sensor  
CON 5: Not Used  
CON 6: Relay 1 contacts (1Amp 24V AC/DC)  
Low-level alarm. Indicated by Yellow LED.  
Normally closed when JP4 link inserted, JP3 link removed, as shown on Fig. 1.  
Normally open when JP3 link inserted, JP4 link removed, as shown on Fig. 1.  
Latching (manual reset by push button located next to CON 7) / Not Latching set by  
JP8 (see Fig. 1. in Connection Instructions)  
Alarm Threshold level set by RV1 and can be set by putting a meter between TP0  
(negative) and TP2 (positive) and adjusting RV1 (scale is 0 to 5V e.g. 2.5V is 50% of  
scale).  
Delayed response time set by JP1 link (see Fig. 1. in External Connections)  
Position 1= No delay  
Position 2=1 min  
Position 3=5 min  
Position 4=10 min  
CON 7: Relay 2 contacts (1Amp 24V AC/DC)  
High-level alarm. Indicated by Red LED on.  
Normally open/closed when JP5 link inserted, as shown on Fig. 1.  
Latching (manual reset by push button located next to CON 7) / Not Latching set by  
JP7 (as above)  
Alarm threshold level set by RV2 and can be set by putting a meter between TP0  
(negative) and TP3 (positive) and adjusting RV2 (scale is 0 to 5V e.g. 2.5V is 50% of  
scale).  
Delayed response time is set by JP2 link (see Fig. 1. in External Connections).  
Position 1= No delay  
Position 2=1 min  
Position 3=5 min  
Position 4=10 min  
If changing any jumper - power must be removed.  
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GAS LEAK DETECTOR INSTALLATION & USER GUIDE  
8. CONNECTIONS AT A GLANCE  
Connector  
CON1  
Pin  
1
Description  
0V Supply Voltage.  
24V Supply Voltage.  
Earth.  
CON1  
2
CON1  
3
CON2  
CON2  
CON2  
CON2  
CON2  
CON2  
CON2  
CON2  
CON2  
CON2  
1
Display Connection – not used.  
Display Connection – not used.  
Display Connection – not used.  
Display Connection – not used.  
Display Connection – not used.  
Display Connection – not used.  
Display Connection – not used.  
Display Connection – not used.  
Display Connection – not used.  
Display Connection – not used.  
2
3
4
5
6
7
8
9
10  
CON3  
CON3  
CON3  
CON3  
1
2
3
4
Analogue Output – 0V.  
Analogue Output – 4-20mA, load resistance <400Ω.  
Analogue Output – 0-10V, load resistance >100Ω.  
Analogue Output – 0-5V, load resistance>10KΩ.  
CON4  
CON4  
CON4  
CON4  
CON4  
CON4  
1
2
3
4
5
6
Plug-in detection sensor module.  
Plug-in detection sensor module.  
Plug-in detection sensor module.  
Plug-in detection sensor module.  
Plug-in detection sensor module.  
Plug-in detection sensor module.  
CON5  
CON5  
CON5  
1
2
3
RS485 Communication – A.  
RS485 Communication – B.  
RS485 Communication – Screen.  
CON6  
CON6  
1
2
NO relay contact.  
NO relay contact.  
CON7  
CON7  
1
2
NO relay contact.  
NO relay contact.  
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Automation & Control Solutions  
Refrigeration Control  
Newhouse Industrial Estate  
Motherwell  
Lanarkshire ML1 5SB  
Phone: (44) 01698 481698  
Fax: (44) 01698 481699  
www.honeywell.com/refrigeration  
Subject to change without notice.  
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