35
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
6.8 Central Heating System
Boiler is designed for use in a sealed central heating
temperatures of up to 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
bar and above 43.5 psi /3.0 bar.
6.9 Domestic Hot Water Mode
• Priority is given to the domestic hot water supply.
• Flow of water, certain minimums are required, will
3 way valve to change position. This will allow the
pump to circulate the primary water through the
DHW plate heat exchanger. (DCCF-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
and gas valve creating ignition in the combustion
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
86°F / 30° C is reached.
6.11 Pump Protection
Pump will automatically operate for 1 minute in every
24 hours to prevent seizing.
FIGURE 6-5
6 - HYDRONIC PIPING
Cold Water
Supply
CH/System
Pump
Demand at tap or shower will override any central
heating requirement.
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.
!
240013375 REV A, [07/01/2021]
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