36
6 - HYDRONIC PIPING
Pressure gauge - to indicate the system pressure to be
maintained.
By-pass (115,125)- Boiler incorporates an automatic
thermostatic radiator valves, an external by-pass must be
6.8 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
• Flow of water, certain minimums are required, will operate
change position. This will allow the pump to circulate the
primary water through the DHW plate heat exchanger.
(DCC 115, 150 & 205 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.
6.10 Frost Protection Mode
Frost protection mode is integrated into the appliance when
electricity is connected to the boiler, regardless if power is "on"
reached.
6.11 Pump Protection
Pump will automatically operate for 1 minute in every 24 hours
of inactivity to prevent seizing.
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.
!
• Priority is given to the domestic hot water supply.
Demand at tap or shower will override any central heating
requirement.
FIGURE 6-6
6.9 Domestic Hot Water Mode
Dunkirk DCC-115, 150 & 205 and DCB 100, 125 & 165
with indirect tank
240013360
REV A [07/01/2021]
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