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ELECTRICAL
WIRING continuation
I
U"
13.
14.
I4a.
14b.
I4c.
l4d.
I4e.
I4f.
149.
18.
27.
28.
30.
31.
32.
35.
37.
38.
$2.
$4.
$5.
51.
Designation
Wiring colours
-Overheat sensor
Brown
-Electrical box
-Regulation
PCB
-Igniter
Red, Black
-Fuse 1.25 A
-Fuse 2A
-Power PCB
-Room thermostat
-Mains 230V 50 Hz
-Pressure switch
2: Black P: Orange
1: White
-Spark electrodes
White
-Ionisation probe
White
-Security solenoid (grey)
Grey
-2/3 gas stage solenoid
(black) Black
-l/3 gas stage solenoid (blue)
Blue
-Pump
-C/H thermistor
Violet
-DHW thermistor
Green
-3 way valve
White, Yellow, Orange
-DHW flow switch
Brown
-C/H flow switch
Red
-Fan
Brown. Blue
REGULATION
Temperature regulation for both C/H and
DHW circuits are controlled by 2 thermis-
tors. The C/H knob allows the adjustment
Df 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 Q at
25 "C
-2631 Q at
40°C
-620 52 at
80°C
-255 Q at
11o"c
FLOW SWITCHES
Flow in both D.H.W. and Heating circuits
are detected by 2 flow switches. A piston
with a magnet at the top operates a REED
switch. The piston is lifted by flow rates
listed below :
Flow rate threshold :
D.H.W.
120 I/h ?20 I/h
C/H
250 I/h *20 I/h
AIR PRESSURE SWITCH
The air flow rate is detected by a pressure
differential created by a venturi located in
the flue duct.
ON threshold
AP > 130 Pa
OFF threshold
AP < 100 Pa
ADJUSTMENTS
ON CONTROL
The following adjustments
are available on the regulation PCB. To
gain access to them, pivot down electrical box, remove the rear
cover and the rear panel of electrical box, unplug connectors from
regulation PCB and pull it toward you.
Heating output limitation :
- Functioning without limitation
plug C on "P MAX"
- Functioning at l/3 gas rate only
plug C on "P l/3"
Burner functioning:
- Regulation available 3/3, l/3, 0
- Functioning at full gas rate only
plug D on "NOR"
plug D on "TUR"
I
ROUTINE SERVICING
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 servi-
cing will depend upon the particular ins-
tallation 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
controls.
- Check combustion chamber insulation
panels for damage.
- Clean the burner.
- Clean the heat exchanger.
- Check the burner manifold injectors.
- Clean gas and water filters.
- Check expansion vessel charge pressu-
re.
- Clean and check operation of safety
valve.
Additional
Procedures
that may be
necessary:
- Check burner pressure and gas flow
rates.
- Check that the fan blades are clean.
- Check, clean and replace components
as
necessary.
- Carry out combustion test utilising the tes
points in the flue turret.
SUGGESTED
SEQUENCE
for SERVI-
CING
Before disconnecting
or removing any
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
0.7 bar cold
- Check operation of l/3 and 2/3 solenoids
- Check that the burner is extinguished
full:
when both solenoids are closed in both
DHW and C/H modes.
- Test ionisation functions and check that
lockout occurs by turning off gas tap.
-Whilst boiler is operating, check operatior
of primary flow switch by closing heating
flow valve and by pass screw (turn clockwi
se) noting the number of turns so that it
may be reset correctly.
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