57
10 - OPERATING INSTRUCTIONS
WARNING
If you do not follow these instructions exactly,
a re or explosion may result causing property
damage, personal injury or loss of life.
• This appliance is equipped with an ignition device
which automatically lights burner. Do NOT try to
light this burner by hand.
• Before operating smell all around appliance area for
• Use only your hand to turn the gas shuto
valve. Never use tools. If valve will not turn by
technician. Force or attempted repair may result in
• Do not use this appliance if any part has been
under water.
technician to inspect appliance and to replace any
part of control system and any gas control which
has been under water.
!
FOR YOUR SAFETY READ BEFORE OPERATING
CAUTION
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use
any phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
•
department.
!!
10.1 Testing For Gas Leaks And Purging The Gas
Supply
•
angles to valve). Pressure test gas supply and inlet pipe
work connection to boiler gas service cock for soundness.
• Loosen screw of pressure inlet gas test port on gas valve.
boiler service cock to purge.
• Retighten test port screw and test for gas leaks. Close
10.2 Boiler Operation
Domestic hot water supply always takes priority over central
heating.
Demand for hot water required during central heating period,
boiler automatically switches to hot water mode until demand
This interruption in central heating is only when demand for
hot water is present and should not be noticed by the User.
10.3 Central Heating Mode
1.
With demand for heating, pump circulates water through
the primary circuit.
2.
After a 3 minute anti-short cycling stage the combustion
fan comes on at ignition speed, closing the air pressure
switch, allowing power to spark generator and gas valve,
creating ignition in the combustion chamber.
3.
combustion chamber sending a signal to the control board.
4.
After initial stabilization period the control board monitors
supply and return temperatures and modulates fan speed
and gas rate accordingly.
5.
shutdown and enter 3 minute anti-cycling mode. The
boiler pump will operate for 3 minutes to dissipate any
residual heat.
If there is a subsequent CH call for heat, boiler will wait 3
minutes to operate.
10.4 Domestic Hot Water Mode
•
• Water in the boiler is diverted from central heating system
to domestic hot water heat exchanger to heat incoming
domestic water.
• Combustion fan will come on at ignition speed, closing
spark generator and gas valve, creating ignition in the
combustion chamber.
•
combustion chamber and send a signal to the control
board.
• After initial stabilization period, the control board monitors
supply and return temperatures and modulates fan speed
and gas rate accordingly.
• Domestic call for heat ends when tap is closed and DHW
• There is no anti-cycling mode after a DHW call for heat.
240013360
REV A [07/01/2021]
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