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10 - OPERATING INSTRUCTIONS
FOR YOUR SAFETY READ BEFORE OPERATING
If you do not follow these instructions exactly, a fire 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 gas. Be sure to smell next to floor because some
gas is heavier than air and will settle to the floor.
• Use only your hand to turn the gas shutoff valve. Never use tools. If valve will not turn by hand,
do not try to repair it, call a qualified service technician. Force or attempted repair may result in fire or
explosion.
• Do not use this appliance if any part has been under water. Immediately call a qualified service
technician to inspect appliance and to replace any part of control system and any gas control which has
been under water.
• 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 gas supplier's instructions.
• If you cannot reach your gas supplier, call the fire department.
10.1 Testing For Gas Leaks And Purging The Gas Supply
• With boiler gas service cock closed (spindle flats at 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 section 13.4 Gas Valve. Verify gas supply is ON. Open boiler
service cock to purge.
• Retighten test port screw and test for gas leaks. Close boiler gas shutoff device.
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 is
satisfied i.e. storage water is to required 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.
Flame sensor acknowledges presence of flame in 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.
Once boiler satisfies CH call for heat, the unit will 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
• When a tap is opened and water flow is sensed by DHW flow switch, domestic hot water call for heat is 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 flow to spark generator and gas
valve, creating ignition in the combustion chamber.
• Flame sensor will acknowledge presence of flame in 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 flow switch does not see water flow.
• There is no anti-cycling mode after a DHW call for heat if there is demand.
10.5 Frost Protection
Boiler monitors supply and return water temperatures to enable frost protection which automatically turns boiler and pump on.
If water in boiler falls below 41°F (5°C), providing boiler is connected to power, boiler will operate until water temperature in the
system reaches approximately 86°F (30°C).
Frost protection is for boiler only and not for complete Central Heating System.
10.6 Pump
If electricity is connected to the boiler, regardless if power is "On" or "Off" and has not operated for 24 hours for heating or hot water,
boiler pump will operate automatically for one minute every 24 hours.
10.7 Low Water Pressure Sensor (Internal)
This device protects primary exchanger from damage. It will not allow boiler to run in a LOW water pressure situation. Low water
condition occurs when water pressure drops below 7.0 psi (0.5 bar).
240012485 REV C [06/30/2019]
WARNING
!
CAUTION
!
WHAT TO DO IF YOU SMELL GAS
50
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