29
Pressure gauge - to indicate the system pressure to be
maintained.
6.7 Central Heating System
Boiler is designed for use in a sealed central heating system.
176°F (80° C), take pump head, expansion tank size, mean
radiator temperature, etc. into account.
Boiler is supplied with the following components: Pressure
relief valve - 30.0 psi (2.1 bar). Boiler internal pressure switch
/3.0 bar.
6.8 Domestic Hot Water Mode
Dunkirk Boiler DCCF-150 and DCBF-125 with indirect
the pump to circulate the primary water through the DHW
plate heat exchanger. (DCCF 150 only)
• Combustion fan will then come on and begin to run at
ignition speed.
• Once the fan reaches ignition speed the control board will
combustion chamber and send a signal to the control
board.
• Temperature sensors will send a signal to the control board
allowing the control board to increase/ decrease the speed
of the fan. The combustion fan will in turn modulate the
gas rate accordingly.
• When the domestic hot water demand ceases the burner
will extinguish, unless there is a demand for central
heating.
6.9 Frost Protection Mode
Frost protection mode is integrated into the appliance when
electricity is connected to the boiler, regardless if power is "on"
reached.
6.10 Pump Protection
Pump will automatically operate for 1 minute in every 24 hours
to prevent seizing.
FIGURE 6-6
6 - HYDRONIC PIPING
Cold Water
Supply
CH/System
Pump
tank
• Priority is given to the domestic hot water supply.
Demand at tap or shower will override any central heating
•
WARNING
Burn, Scald Hazard! Water temperature over 125°F
(51°C) can cause severe burns and scalding. See
User's Manual before setting water temperature.
Failure to follow these instructions could result in death
or serious injury.
!
240012564 REV A, [05/15/2019]
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