Baxi Potterton BAXI COMBI INSTANT 105 HE User Manual

User’s Operating Instructions  
Baxi Combi Instant 80 HE  
Baxi Combi Instant 105 HE  
Gas Fired Wall Mounted  
Condensing Combination Boiler  
Please keep these instructions safe.  
Should you move house, please hand  
them over to the next occupier.  
Legislation  
IMPORTANT - Installation, Commissioning, Service & Repair  
Baxi declare that no substances harmful to health are  
contained in the appliance or used during appliance  
manufacture.  
This appliance must be installed in accordance with the manufacturer’s instructions and  
the regulations in force. Read the instructions fully before installing or using the  
appliance.  
The appliance is suitable only for installation in GB and IE and  
should be installed in accordance with the rules in force, and  
only used in a suitably ventilated location.  
In GB, this must be carried out by a competent person as stated in the Gas Safety  
(Installation & Use) Regulations.  
In GB, the installation must be carried out by a CORGI  
Registered Installer. It must be carried out in accordance with  
the relevant requirements of the:  
Definition of competence: A person who works for a CORGI registered company and  
holding current certificates in the relevant ACS modules, is deemed competent.  
• Gas Safety (Installation & Use) Regulations.  
• The appropriate Building Regulations either The  
Building Regulations, The Building Regulations  
(Scotland), Building Regulations (Northern Ireland).  
• The Water Fittings Regulations or Water Byelaws in  
Scotland.  
In IE, this must be carried out by a competent person as stated in I.S. 813 “Domestic  
Gas Installations”.  
Lifting - This product should be lifted and handled by two people. Stooping should be  
avoided and protective equipment worn where necessary. Carrying & lifting equipment  
should be used as required, e.g. when installing in a loft space.  
• The Current I.E.E. Wiring Regulations.  
Where no specific instructions are given, reference should be  
made to the relevant British Standard Code of Practice.  
The addition of anything that may interfere with the normal operation of the appliance  
without express written permission from the manufacturer or his agent could invalidate  
the appliance warranty. In GB this could also infringe the Gas Safety (Installation and  
Use) Regulations.  
In IE, the installation must be carried out by a competent Person  
and installed in accordance with the current edition of I.S. 813  
‘Domestic Gas Installations’, the current Building Regulations and  
reference should be made to the current ETCI rules for  
electrical installation.  
Warning - Check the information on the data plate is compatible with local supply  
All systems must be thoroughly flushed and treated with  
inhibitor.  
conditions.  
Codes of Practice, most recent version should be used  
Benchmark Commissioning Checklist  
In GB the following Codes of Practice apply:  
Please ensure that your installer hands you the boiler Installation & Servicing Instructions  
with the Benchmark Commissioning Checklist sections completed. The details in the  
Checklist will be required in the event of any warranty work. Keep the instructions in a  
safe place and ensure that the Service Interval Record at the back is completed at each  
service visit.  
Standard  
BS 6891  
BS 5546  
Scope  
Gas Installation.  
Installation of hot water supplies for  
domestic purposes.  
BS 5449  
BS 6798  
BS 5440 Part 1  
BS 5440 Part 2  
BS 7074  
Forced circulation hot water systems.  
Installation of gas fired hot water boilers.  
Flues.  
Ventilation.  
Expansion vessels and ancillary equipment  
for sealed water systems.  
Treatment of water in domestic hot water  
central heating systems.  
BS 7593  
All CORGI registered installers carry a CORGI identification card and have a  
registration number. You can check your installer is registered by telephoning  
In IE the following Codes of Practice apply:  
Standard  
I.S. 813  
Scope  
0870 4012300 or writing to:-  
1 Elmwood,  
Domestic Gas Installations.  
The following BS standards give valuable additional information;  
BS 5546  
Installation of hot water supplies for  
domestic purposes.  
Forced circulation hot water systems.  
Expansion vessels and ancillary equipment  
for sealed water systems.  
Chineham Business Park,  
Crockford Lane,  
BS 5449  
BS 7074  
Basingstoke. RG24 8WG  
BS 7593  
Treatment of water in domestic hot water  
central heating systems.  
3
1.0 Warnings  
1.1  
In an Emergency  
If a water or gas leak occurs or is suspected, the boiler  
can be isolated at the inlet valves as follows;  
1. Turn off the electrical supply and turn the selector  
switch on the facia box to the OFF position.  
Gas Tap  
2. Using a suitable open ended spanner or screwdriver  
turn the square on the gas tap to the left to isolate the  
gas supply at the boiler (Fig. 1).  
3. The isolating valves are positioned under the boiler  
and can be closed by turning their taps to the right  
towards the wall (Fig. 2).  
Fig. 1  
4. Call your Installer or Service Engineer as soon as  
possible.  
Fig. 2  
Heating Flow, Heating Return and  
Mains Water Inlet  
Isolating Valves  
1.2  
In case of gas leaks  
1. If a gas leak is found or suspected, turn off the gas  
supply at the meter immediately and at the isolating  
valve on the boiler if possible. Contact your Gas Supplier  
immediately.  
1.3  
Servicing your Appliance  
1. For reasons of safety and economy your appliance  
should be serviced annually. Servicing must be  
performed by a competent person. Your Installer or  
Service Engineer will be able to advise you.  
2. Any purpose provided ventilation should be checked  
periodically to ensure that it is free from obstruction.  
1.4  
Electricity Supply  
1. THIS APPLIANCE MUST BE EARTHED.  
2. A standard 230V ~ 50Hz supply is required. The  
appliance must be protected by a 3 amp fuse.  
Never Hang Flammable Items Over The Appliance  
4
2.0 Introduction  
2.1  
Introduction  
1. Your Baxi Combi Instant 80 HE or 105 HE is a gas  
fired, room sealed, powered flue condensing combination  
boiler, providing central heating for your home and mains  
fed domestic hot water to taps and shower. It is fully  
automatic and does not have a pilot light.  
2. Priority is given to the hot water mode - when a hot  
water tap is turned on the supply of heat to the central  
heating circuit is interrupted.  
Hinged Lower  
Door Panel  
3. Due to the high efficiency and resultant low flue gas  
temperature when in condensing mode a white plume of  
condensate will be emitted from the terminal. This will be  
particularly evident during periods of low outside  
temperature.  
Facia Panel  
PREHEAT  
OFF  
30o 40o 50o 60o 70o 80o  
2
2.2  
Instant Domestic Hot Water  
Reset  
ON  
bar  
1. The boiler expansion vessel incorporates a small  
volume of stored primary hot water.  
2. When the boiler has been off and there is then a  
demand for domestic hot water the stored primary hot  
water ensures that domestic hot water is supplied  
instantly at temperature.  
1
2
3
4
5
6
7
8
9
10  
11  
Fig. 3  
3. The stored hot water is part of the primary circuit. This  
is not supplied as domestic hot water, which is fresh  
mains water heated by a heat exchanger within the boiler.  
30o 40o 50o 60o 70o 80o  
4. The stored primary hot water temperature is  
maintained whilst the boiler is in operation. During a  
period when there is no demand for heating or hot water  
the temperature of the stored primary hot water will  
eventually fall. The boiler will operate occasionally in  
order to maintain the temperature. This is indicated by  
the domestic hot water mode neon flashing (item 13 of  
Fig. 3).  
12  
13  
14  
15  
2.3  
Facia Panel  
1. The facia panel is behind the hinged lower door panel.  
As well as the on/off/reset selector switch, central heating  
temperature control knob, pre-heat control and pressure  
gauge, the facia incorporates ten neon indicator lights.  
KEY TO FACIA PANEL (Fig. 3)  
1.On/Off/Reset Selector Switch  
2.Central Heating Temperature Control  
3.Pre-Heat Control  
4.Central Heating System Pressure Gauge  
5.Optional Integral Timer Position  
Neon Indicators  
6.Flame Failure or Blocked Condensate Drain  
7.Safety Thermostat Activated (Boiler or Flue)  
8.Fault on Fan or Flue  
When neons 6 to 11 are  
constantly illuminated, they  
indicate the temperature of the  
central heating water.  
2. Neons 12 to 15 indicate the operational status of the  
boiler. Neons 6 to 11 have a dual function, indicating the  
temperature of the central heating water when constantly  
illuminated. If a fault develops the appropriate neon will  
begin to flash. Refer to Sections 3.3 to 3.7.  
9.Fault on Pump or Low System Pressure  
10.Fault on Hot Water Sensor  
11.Fault on Central Heating Sensor  
12.Power On  
13.Domestic Hot Water Mode  
14.Central Heating Mode  
15.Burner On  
5
3.0 Operating the Boiler  
3.1  
Operating the Boiler  
1. Ensure that the electricity and gas supplies are turned  
on. Check that the central heating pressure is between  
0.5 and 1.0 bar (Fig. 4).  
2. Turn the On/Off/Reset selector switch either anti-  
clockwise from the off position (Fig. 6) to both central  
heating and domestic hot water or clockwise to domestic  
hot water only.  
6
7
8
9
10 11  
30o 40o 50o 60o 70o 80o  
3. In either position the green power on indicator  
(
) will illuminate (Fig. 5).  
4. Position (i) In this position the central heating will  
operate according to demand or provide domestic hot  
water when a tap or shower is turned on (Fig. 7). Priority  
is given to domestic hot water. The central heating/hot  
2
water neon (  
) will illuminate (Fig. 5). Neons 6 to 11  
will illuminate as the temperature rises.  
Power On  
Neon  
Burner On  
Neon  
bar  
5. Position (ii) In this position hot water will be provided  
Fig. 5  
Domestic  
Hot Water  
Neon  
when a tap or shower is turned on  
Central  
Heating Neon  
(Fig. 8). The hot water neon (  
) will illuminate (Fig. 5).  
Central Heating System  
Pressure Gauge  
Fig. 4  
6. The boiler will light automatically on demand.  
PREHEAT  
OFF  
7. The orange burner on neon ( ) will illuminate when  
the boiler is operating and the main burner is on (Fig. 5).  
30o 40o 50o 60o 70o 80o  
2
Reset  
ON  
bar  
IMPORTANT: When the selector switch is in the ‘0’  
(Off) position the electrical supply to the boiler is  
isolated. The boiler will not operate and the integral  
timer (if fitted) will require resetting once the  
selector switch is set to either Position (i) or  
Position (ii).  
On/Off/Reset  
Selector Switch  
Reset  
Reset  
OFF Position  
Position (i)  
(Central Heating or Hot Water)  
Fig. 7  
Fig. 6  
Reset  
Position (ii)  
(Hot Water)  
Fig. 8  
6
3.0 Operating the Boiler  
3.2  
Temperature Control  
1. Central Heating: The central heating hot water flow  
temperature can be adjusted between 30° C ( 5° C)  
minimum and 85° C ( 5° C) maximum.  
2. Turn the control knob clockwise to increase the  
temperature (Fig. 9).  
3. In normal winter usage we recommend that the  
central heating temperature be set at maximum.  
4. Domestic Hot Water Pre-Heat: To enjoy optimum  
performance of the boiler the pre-heat control should  
be set fully clockwise to the ON position (Fig. 10).  
When there is a demand for hot water it will be supplied  
at approximately 65° C instantaneously.  
Fig. 9  
Central Heating  
Temperature Control  
5. Turning the control 15° clockwise from the OFF  
position will activate the pre-heat feature. Hot water will  
be supplied at approximately 35° C instantaneously.  
PREHEAT  
OFF  
PREHEAT  
OFF  
6. To increase the temperature turn the control further  
clockwise. For example, when set 90° clockwise the  
boiler will supply hot water at approximately 44° C  
instantaneously. At a position 180° from clockwise (i.e.  
straight down) the hot water will be supplied at 52° C  
instantaneously.  
ON  
ON  
Fig. 11  
Fig. 10  
Domestic Hot Water  
Pre-Heat Control  
Domestic Hot Water  
Pre-Heat Control  
7. When the control is set anywhere between 15°  
clockwise from the OFF position and the ON position,  
the pre-heat feature will operate.  
ON Position  
OFF Position  
8. With the control in the OFF position (Fig. 11) the pre-  
heat feature will not operate. Hot water will be supplied  
at approximately 50° C.  
Flame Failure  
Neon  
9. The pre-heat feature will function with the selector  
switch in either operating position. This is indicated by  
the domestic hot water mode neon flashing (Fig. 12).  
30o 40o 50o 60o 70o 80o  
10. The flow rate can be reduced down to as low as 2.5  
litre/min. The boiler will still recognise the need to heat  
the water.  
Fig. 12  
3.3  
Flame Failure Reset  
Domestic Hot  
Water Neon  
1. The red flame failure neon ( ) will illuminate in the  
event of the burner failing to light, when incomplete  
lighting of the burner occurs or blockage of the  
condensate drain (Fig. 12).  
2. Turn the selector switch fully anti-clockwise against  
the spring pressure to the ‘Reset’ position for at least  
two seconds and release (Fig. 13). Set the selector to the  
required position to light the boiler.  
Reset  
3. If the flame failure light illuminates repeatedly a fault is  
indicated with either the boiler, the gas supply or the  
condensate drain. Your Installer or Service Engineer  
should be called as soon as possible.  
Reset Position  
Fig. 13  
7
3.0 Operating the Boiler  
Pump/Low  
Pressure Neon  
Air Flow  
Monitor Neon  
3.4  
Safety Thermostats  
Sensor Fault  
Neons  
Safety  
1. Your Baxi Combi Instant 80 HE or 105 HE is fitted  
with additional safety devices, which shut down the  
boiler in the event of the system, the boiler or the flue  
overheating. The safety thermostat neon ( ) will light  
in this instance (Fig. 14).  
Thermostat  
Neon  
30o 40o 50o 60o 70o 80o  
2. To reset: Turn the selector fully anti-clockwise against  
the spring pressure to the ‘Reset’ position for at least  
two seconds and release (Fig. 15). Set the selector to the  
required position to light the boiler.  
3. If after turning the selector to the ‘Reset’ position the  
boiler does not relight or the safety thermostat operates  
repeatedly, causing boiler shutdown, a fault is indicated.  
Your Installer or Service Engineer should be contacted as  
soon as possible.  
Fig. 14  
3.5  
Air Flow Monitor  
1. The boiler is fitted with an air pressure sensing device.  
This monitors the flue system.  
2. If the neon illuminates (  
) it indicates that the flue  
or flue terminal is blocked or obstructed in some way, or  
that there is an internal fault. If there is no external  
blockage of the flue terminal that can be easily removed  
contact your Installer or Service Engineer (Fig. 14).  
Reset  
3.6  
Pump Fault or Low Pressure  
1. The neon ( ) will illuminate if the circulating pump  
is faulty or the system pressure drops below the  
minimum requirement (Fig. 14).  
Reset Position  
Fig. 15  
2. Check the pressure gauge as described in Section 3.9.  
If the pressure is in the normal range, a pump fault is  
indicated. Contact your Installer or Service Engineer to  
determine the nature of the fault.  
Reset  
3.7  
Sensor Fault  
) or (  
1. When the (  
) neon is illuminated a fault  
on the hot water or central heating temperature sensor  
is indicated (Fig. 14). Contact your Installer or Service  
Engineer.  
Fig. 16  
3.8  
Pump Protection  
1. With the selector switch in either Position (i) or  
Position (ii) (Figs. 16 & 17) the pump will automatically  
operate for 1 minute in every 24 hours to prevent  
sticking.  
Reset  
Fig. 17  
8
3.0 Operating the Boiler  
Pressure Gauge  
3.9  
Central Heating System Pressure  
2
1. The water pressure in the central heating system is  
indicated by the pressure gauge.  
bar  
2. With the system cold and the boiler not operating  
the pressure should be between 0.5 and 1.0 bar. During  
operation the pressure should not exceed 2.5 bar, and  
will normally be between 1.0 and 2.0 (Figs. 18 & 19).  
Fig. 18  
Normal Pressure (when cold)  
3. A pressure of 3 or greater indicates a fault. The safety  
pressure relief valve will operate, at a pressure of 3  
(Fig. 20). It is important that your Installer or Service  
Engineer is contacted as soon as possible.  
2
bar  
4. The MINIMUM pressure for correct operation is 0.5.  
If the pressure falls below 0.5, this may indicate a leak  
on the central heating system (Fig. 21).  
Fig. 19  
Normal Pressure (operating)  
3.10  
To Shut Off the Boiler  
2
1. For short periods: Turn the selector switch to the  
OFF position (Fig. 22).  
bar  
2. For long periods: Turn off the selector switch  
Fig. 20  
(Fig. 22), electricity and gas supplies.  
Fault  
If your home is to be left unoccupied for long  
periods during cold weather the boiler and whole  
system should be drained unless there is additional  
frost protection.  
2
bar  
3. Your installer will advise you about frost protection  
and draining the system.  
Fig. 21  
IMPORTANT: When the selector switch is in the  
‘0’ (Off) position the electrical supply to the boiler  
is isolated. The boiler will not operate and the  
integral timer (if fitted) will require resetting once  
the selector switch is set to either Position (i) or  
Position (ii).  
Below Minimum  
ON/OFF  
Selector Switch  
3.11  
Frost Protection Mode  
1. The frost protection feature will operate when the  
selector switch is in the central heating and domestic  
hot water mode.  
Reset  
The gas and electrical supplies to the boiler must be on  
and the system pressure must be within the range  
described in Section 3.9.  
2. If the system temperature falls below 5°C, then the  
boiler will fire until the water temperature has been  
raised.  
Fig. 22  
OFF Position  
3. Further frost protection can be incorporated by using  
a frost thermostat to protect the whole system.  
9
4.0 Clearances and Check List  
20mm/5mm Min  
see *NOTE:  
450mm  
5mm Min  
4.1  
Clearances around the Boiler  
(Figs. 23 & 24)  
1. The minimum clear spaces needed around the boiler  
measured from the casing are as follows:  
200mm Min  
Top  
-
-
-
-
-
-
200mm  
200mm  
5mm  
20mm/5mm  
5mm  
Bottom  
Left Side  
Right Side  
Front  
(In Operation)  
(For Servicing)  
450mm  
* NOTE: The boiler can be operated with a clearance  
of 5mm at the right. This is also sufficient for routine  
maintenance. However a clearance of 20mm is  
required if it is necessary to remove the secondary  
heat exchanger. This should be considered when siting  
the appliance and in the event of any subsequent  
alteration in the area of installation.  
780mm  
2. These areas must not be obstructed in any way.  
Blocking the clearance spaces may result in the boiler  
overheating and damage may occur.  
3. The gas burning compartment of your boiler is  
completely sealed from the room in which it is fitted.  
Products from the combustion of gas are vented to the  
outside through the flue terminal which must be kept free  
from obstruction as this would interfere with the correct  
operation of the boiler.  
200mm Min  
4. The boiler may be installed in a cupboard if these  
minimum clearances are kept. The compartment should  
be large enough to house the boiler and ancillary  
equipment only.  
Fig. 23  
5. IT SHOULD NOT BE USED AS A STORAGE  
CUPBOARD.  
4.2  
Check List  
1. If a fault develops, or is suspected, call your Installer or  
Service Engineer as soon as possible.  
2. Go through the following check list before you make  
contact.  
450mm Min  
a) Is the electricity supply on ?  
b) Is the selector switch on (giving a green “Power ON”  
neon) and set for both Central Heating and Domestic  
Hot Water ?  
For Servicing  
Purposes  
c) Is the red “Flame Failure” neon lit ? Turn the  
On/Off/Reset selector fully anti-clockwise.  
d) Is the gas supply on ?  
e) Is the mains water supply turned on ?  
f) Is the system pressure correct ?  
g) Are the boiler temperature controls set high enough ?  
h) Is the time clock (if fitted) calling for central heating ?  
i) Is the room thermostat (if fitted) set high enough ?  
j) Are the radiator valves open ?  
5mm  
In Operation  
Fig. 24  
10  
5.0 Cleaning, Spares & Guarantee  
5.1  
Cleaning the Outercase  
The painted panels should be wiped with a damp cloth  
and then dried completely. DO NOT USE ABRASIVE  
CLEANING AGENTS.  
5.2  
Spare Parts  
IMPORTANT - Only a competent person should be  
used to service or repair this boiler.  
1. Any repairs to the boiler will usually be the  
responsibility of the Installer during the guarantee period  
after which spare parts may be obtained through  
approved Baxi stockists if required.  
2. Quote the appliance name, model number and where  
possible the part number when ordering spares. A short  
parts list is included in the Installation and Servicing  
Instructions.  
3. The name, model number and serial number can be  
found on the information label on the back of the hinged  
lower door panel (see back page).  
5.3  
Guarantee  
1. Your Baxi Combi Instant 80 HE or 105 HE is designed  
and produced to meet all the relevant Standards.  
2. Baxi provide a 12 month guarantee on the boiler. The  
guarantee operates from the date installation is  
completed for the customer who is the original user.  
3. To maximise the benefit from our guarantee we urge  
you to return the reply-paid guarantee registration.  
4. This does not in any way prejudice your rights at  
Common Law. Such rights between the customer and  
the installer or supplier from whom the unit was  
purchased remain intact.  
Any component or part which becomes defective  
during the guarantee period as a result of faulty  
workmanship or material whilst in normal use will be  
repaired or replaced free of charge.  
11  
When contacting Baxi Potterton please have the following  
information to hand:  
Appliance Name  
Model Number  
Serial Number  
A label giving these details is situated on the rear of the  
hinged lower door panel attached to the users operating  
instruction label.  
Users Operating  
Instruction Label  
Lower Door  
Panel  
Label  
BAXI POTTERTON  
A Trading Division of Baxi Heating UK Ltd  
923.611.2  
Brownedge Road Bamber Bridge Preston Lancashire PR5 6UP  
After Sales Service 08706 096 096 Technical Enquiries 08706 049 049  
o
Comp N 5111808 - Iss 2 - 03/05  

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