55
10.1 Testing For Gas Leaks And Purging The Gas
Supply
•
right 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. See Figure 9-3 Gas Valve. Verify gas supply is
ON. Open boiler service cock to purge.
• Retighten test port screw and test for gas leaks.
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.
• If you cannot reach your gas supplier, call the
!!
10 - OPERATING INSTRUCTIONS
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
temperature.
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.
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
•
initiated.
• 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 the air pressure switch, allowing power to
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
• There is no anti-cycling mode after a DHW call for
heat if there is demand.
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
because some gas is heavier than air and will
• Use only your hand to turn the gas shuto
valve. Never use tools. If valve will not turn
service technician. Force or attempted repair
• Do not use this appliance if any part
has been under water. Immediately call
appliance and to replace any part of control
system and any gas control which has been
under water.
!
240013375 REV A, [07/01/2021]
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