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(N
0
Operating Switci". ON
and tap on.
Hot watet
Demand.
(Overrides central h=ating
mode and pump O\'errun
function.)
1 7.
Operational Flow Diagrams
Note. The alpha references in these charts are to be used for cross- referencing when fault finding. See Section 18 .
II
Pump on, or continue
from pump overrun
mode.
YES
Vlait for domestic hot
water temperature to
fall below set level.
(Pump remains on).
Main gas valve and
r--~~
piot valve remain open.
Fan remains on.
Signal
from
1---...J
Is central heating
flow switch.
interrupted?
DEMAND
indicator
illuminated
No Demand and
primary water
temperature above
60°C.
~
Pump on until primary
water temperature
falls below 60°C_
up sequence.
SEE
DE~AILED
SEQUENCE ABOVE.
3.
Pump
Overrun Function.
Fan off.
Domestic hot water
temperature monitored
by domestic hot
water sensor.
Domestic hot water
temperature rises above
pre·set level.
water temperature at
factory pre-set level.
2. Domestic Hot Water Mode.
Gas
to Water heat
excbang2r excess
temperature causes
boiler overheat
thermos~
to trip.
~
Gas valves and ian
shut down but pump
and indicator lights
rema:non
ill
Demand still
exists)
.--I
·-
Operating Switch OFF.
Tap off.
I
r--+
Monitor primary water
via central heating
sensor and continue
into central heating
mode.
~
EITHER
It
YES
Hot water
~
Is there a central
NO
-
Demand
heating Demand?
satisfied.
~
DEMAND indicator off.
Main gas valve and
pilot valve off.
Fan off.
Pump off, or continue
into overrun mode.
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