Chaffoteaux & Maury Britony combi 80 Maintenance And Service Manual page 4

"burner on" indicator
4 (21) will light and water temperature is controlled by the hot shuts off the gas. The red lockout indicate
the heating will be on.
water control thermistor 38 and the central bulb 0 22 will light.
When there is a need for hot water while heating control thermistor (37). This
SYS-
The central heating flow temperature i:
the heating is on, it is only necessary to turn tern anticipates the changes of temperatu- controlled by the central heating contra
on a hot tap. The heating will be
interrupted
re in the secondary heat exchanger and thermistor (37). The boiler has been desi
momentarily while the hot water is being ensures accurate temperature
regulation. gned to minimise cycling and will not attemp
delivered. The boiler will switch back auto-
matically to heating when the tap is turned
to relight for at least 3 minutes after the boi
When the tap is closed the burner is extin- ler thermostat has been satisfied. When the
Off.
guished and the pump stops. The boiler room thermostat is satisfied the burner wil
Note: If the boiler has been turned off for will now stay in the hot water mode for switch off and the pump will remain running
some time the first attempt to light it may three minutes to maintain temperature to for a further 3 minutes before it too stops.
result in a lockout @ (22) . If this happens
ensure a fast response in the event of a
press the reset button (23) and the boiler subsequent hot water demand.
NB
will light.
It is possible to override the 3 minute dela!
Priority will be given to a demand for hot by pressing the RESET button (23).
Domestic Hot Water Mode
water. This will interrupt the central hea-
To be able to supply hot water, the selector
ting for the duration of hot water delivery. Lock out procedure
switch 15 must be in either on ,:' or
Flame disappearance :
'1111 2
position. This will be confirmed
by Central Heating Mode
When the ionisation electrode (28) does no
the green indicator light 0 (20)
To be able to supply heating, the selector
detect flame presence. The orange indicate
switch (15) must be on
'Ill1
c? position.
lamp (21) extinguishes. A lighting cyck
When a tap or shower is turned on, the flow This will be confirmed by the green indica-
starts. If a flame is not detected before f
of mains water, above 2 litres per min., will tor light 0 (20).
seconds, the grey security solenoid (30) ark
activate the DHW flow switch (44) and
the blue i/3 solenoid (31) will close. The
allow the 3 way valve (42) to move to the
When there is a demand for heating
lock out red indicator (22) lights, the pump
DHW position. The pump can now circulate (either from the room thermostat or the
(35) runs and the 3 way valve (42) stays ir
Its position.
primary water heated by the main heat clock) the pump starts. If the boiler tempe-
exchanger through the secondary heat rature control is calling for heat and prima-
After a few seconds, it will become possibk
to reset the boiler by pressing the reset but
exchanger.
ry flow rate over 4 Itr/min, the central ton (23).
heating flow switch operates ailowing the
The first stage solenoid (31) (blue) and .
Ignition sequence to begin. The first stage Overheat detection :
security solenoid (30) (grey) open together
to allow gas to the burner. The ignition
solenoid (31) (blue) and security solenoid If an overheat is detected by the senso
sequence begins and a continuous high
(30) (grey) open together to allow gas to (13), the grey security solenoid (30) and the
speed spark ignites the gas. As soon as a the burner. The ignition sequence begins
blue i/3 (31) closes, the orange indicate
flame is detected the orange indicator bulb and a continuous high speed spark ignites
lamp (21) extinguishes. The ignitor is energi
h (21) will light and the second stage sole- the gas. As soon as a flame is detected
sed for 8 seconds and the red lockout indi
noid (32) (black) opens to allow the full gas the orange indicator bulb b (21) will light.
cator (22) ligths. If the burner cannot religh
the boiler will go to lockout.
rate. If a flame is not detected, after 8 After 45 seconds the second stage sole-
seconds, the security solenoid closes and noid (32) (black) opens to allow the full
shuts
Off
the gas. The red lockout indicator
gas
rate, lf a flame is not detected, after 8
bulb @ (22) will light. The domestic hot seconds, the security solenoid closes and
WIRING
rEiimiq
Plug for main power and Room
thermostat connection
I
1 2 3 4 5
El
1. Neutral
2. Phase
3. Room thermostat live
4. Accelerator resistor
5. Common for Accelerator and room
thermostat.
4