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8.11 DHW Indirect Water Heater
Connect DHW indirect tank sensor or thermostat (TS) to
"T dhw" terminals on control board.
8.12 Frost Protection
Frost protection in combination with ON/Off
thermostat.
• If ON/Off thermostat is used, protect any rooms where
there is a risk of freezing by using freeze thermostat
(FT). Radiator valves or zone where there is risk of
freezing must be open.
• Connect frost thermostat in parallel with On/Off room
thermostat (RT) to ON/Off_OT terminals of control
board connection.
Frost protection in combination with outdoor
temperature sensor.
• Heating system can be protected against freezing in
combination with outdoor temperature sensor. Radiator
valve or zone must be open where there is a risk of
freezing.
• Connect outdoor temperature sensor to "T out"
terminals of control board.
• Frost protection activates when outdoor temperature
sensor reads a temperature lower than 10°F (-10°C ).
This can be adjusted using parameter P30. Circulation
pump will switch on and operate continuously until
the outdoor temperature increases past value set on
parameter P30.
8 - ELECTRICAL CONNECTIONS
FIGURE 8-12 Indirect Water Heater Thermostat
FIGURE 8-13 Frost Protection in Combination with
ON/OFF Thermostat
49
P/N 240011654, Rev. C [06/08/2017]
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