Operating Instructions; Testing For Gas Leaks And Purging Gas Supply; Boiler Operation; Central Heating Mode - ECR International Dunkirk DCBF-75 Manual

FOR YOUR SAFETY READ BEFORE OPERATING
!
WARNING
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.
! !
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
fire department.
10.1 Testing For Gas Leaks And Purging The Gas
Supply
• With boiler gas service valve closed (spindle flats
at right angles to valve). Pressure test gas supply
and inlet pipe work connection to boiler gas service
valve.
• 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 valve to purge.
• Retighten test port screw and test for gas leaks.
Close boiler gas shutoff valve.

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
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

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With demand for heating, pump circulates water
through the primary circuit.
After a 3 minute anti-short cycling delay the
combustion fan comes on at ignition speed, closing
the air pressure switch if applicable to model,
allowing power to spark generator and gas valve,
creating ignition in the combustion chamber.
Flame sensor acknowledges presence of flame in
combustion chamber sending 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.
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.
240013509 REV A, [03/15/2022]