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5.9 Domestic Hot Water Mode
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.
1.48 GA & 60 GA with indirect tank
• Priority is given to the domestic hot water supply. Demand at tap or shower will override any central heating requirement.
• Flow of water will operate the DHW flow switch which requests the 3 way valve to change position. This will allow the pump
to circulate the primary water through the DHW plate heat exchanger. (60 GA only)
• Combustion fan will then come on and begin to run at ignition speed.
• Once the fan reaches ignition speed the control board will allow power to flow to the spark generator and gas valve creating
ignition in the combustion chamber. The flame sensor will acknowledge the presence of the flame in the 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.
5.10 Frost Protection Mode
Frost protection mode is integrated into the appliance when power is supplied, regardless if boiler is in "OFF" or "ON" mode. If the
temperature falls below 41°F / 5° C boiler will fire on its minimum setting until flow temperature of 86°F / 30° C is reached.
5.11 Pump Protection
Pump will automatically operate for 1 minute in every 24 hours to prevent seizing.
FIGURE 5-6 Primary Secondary Piping
CH/System
Pump
Note
1
12" (305MM) MAXIMUM SEPARATION
240012485 REV C [06/30/2019]
WARNING
!
Cold Water
Supply
BOILER
ASME Relief
Valve
1
20
Purge Valve
Magnetic
Dirt
Separator
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