Air Pressure Switch; Routine Servicing; Combustion Testing - Chaffoteaux & Maury Britony Combi SE Maintenance And Service Manual

P3
JP3
REGULATION
Temperature regulation for both C/H and
DHW circuits are controlled by 2 thermis-
tors. The C/H knob allows the adjustment
of temperature between 35 and 85°C. The
DHW temperature is limited to 60°C. DHW
and C/H thermistors are identical and
interchangeable.
Resistance value are
-5000 Ω at
25 °C
-2631 Ω at
40°C
-620 Ω at
80°C
-255 Ω at
110°C

AIR PRESSURE SWITCH

The air flow rate is detected by a pressure
differential created by a venturi located in
the flue duct.
∆P > 130 Pa
ON threshold
∆P < 100 Pa
OFF threshold

COMBUSTION TESTING

Nox Values
Britony SE Natural Gas G20
SE 80 95 ppm
SE 100 109 ppm
CO Values
Britony SE Natural Gas G20
SE 80 15 ppm
SE 100 21 ppm
ADJUSTMENTS ON CONTROL PCB
mini maxi
P3
Detail
(P3-P4-P5)
To ensure continued efficient operation of
the appliance, it is recommended that it is
checked and serviced as necessary at
regular intervals. The frequency of servic-
ing will depend upon the particular instal-
lation condition and usage, but in general,
once a year should be adequate.
It is the law that any service work must be
carried out by a competent person such
as your local Chaffoteaux Service Centre,
British Gas or other CORGI registered
personnel in accordance with the current
Gas Safety (Installation and Use)
Regulations.
The service schedule should include
the following operations:
- Check the pressure in the system.
- Check the correct operation of the
appliance.
- Check the correct operation of the gas
controls.
- Check the functions of the safety con-
trols.
- Check combustion chamber insulation
panels for damage.
- Clean the burner.
- Clean the heat exchanger.
- Check the burner manifold injectors.
- Clean gas and water filter.
- Check expansion vessel charge pres-
sure.
- Clean and check operation of safety
valve.
Additional Procedures that may be
necessary:
- Check burner pressure and gas flow
rates.
5
Adjustment on the PCB :
- P3 : potentiometer TAC (Temporisation Anti Cycle)
may be adjusted between 30 seconds and 3 min-
utes (see detail) (factory set at 3 minutes).
- JP3 : the spade connector allows the gas rate to be
reduced to 1/3 performance by positionning
spade across pins as shown A
Full performance across pins as shown B.(factory
set)
After completling adjustments replace rubber cover and
refit outer casing
A
P3
R85 R85
1/3

ROUTINE SERVICING

- Check that the fan blades are clean.
- Check, clean and replace components
as necessary.
- Carry out combustion test utilising the
test points in the flue turret.
SUGGESTED SEQUENCE for SERVIC-
ING
P3
Before disconnecting or removing any
3/3
parts, isolate the gas and electricity sup-
plies. Ensure that the appliance is cool.
(for detail please see section on Parts
Removal and Replacement)
Preliminary Checks
- Remove outer case
- Check the system pressure is at least
0.8 bar cold
- Check operation of solenoids.
- Check that the burner is extinguished
fully when solenoids are closed in both
DHW and C/H modes.
- Test ionisation functions and check that
lockout occurs by turning off gas tap.
CLEANING THE BOILER
Any cleaning work must only be done
when the boiler is switched off.
Under normal circumstances dusting
should be enough. An occasional wipe
over with a damp cloth will remove any
marks from the casing. On no account
use an abrasive cleaning powder or liq-
uid.
P3
1/3
B
P3
F1 F1 F1A F1A
3/3