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When radiant floor heating is installed, it is always the first stage of heating, followed
by the heat pump, and lastly any backup heating. This allows the floor to remain
warm in the heating season.
Equipment Setting
1HP
1HP/
1Aux
1HP/
2Aux
2HP
2HP/
1Aux
2HP/
2Aux
First stage heating
Y1
W1
W1
Y1
W1
W1
Second stage heating -
Y1
Y1
Y2
Y1
Y1
Third stage heating
-
-
W2
-
Y2
Y2
Fourth stage heating
-
-
-
-
-
W2
First stage cooling
Y1
Y1
Y1
Y1
Y1
Y1
Second stage cooling -
-
-
Y2
Y2
Y2
Fan
G
Accessory 1
Choice of: Humidifier, Dehumidifier, HRV/ERV ventilator
Accessory 2
Reversing valve O or B.
O relay remains closed during heating operation.
B relay remains closed during cooling operation.
Heating Differentials
The first stage heat turns on when the air temperature falls 1.5°F (1°C) below the
Heat To setting and shuts off when the air temperature reaches the Heat To setting.
The second, third and fourth stage heat each have an adjustable differential and time
delay setting to determine when the stage turns on, and shut off when they reach 1.5,
1.0, and 0.5°F (0.75, 0.5, and 0.25°C) of the Heat To setting respectively.
Radiant Floor Heating
Radiant floor heating is operated differently than other heating types due to the large
time delays to heat and cool the slab. When Radiant Floor Heating is selected in the
setup menu, the W1 relay operates using Pulse Width Modulation. This improves
comfort for radiant systems with high mass floors.
• 100% on time at Heat To setting -1.5°F
• 50% on time at Heat To setting
• 0% on time at Heat To s 1.5°F
Room Sensor and Averaging
The room temperature can be measured using a combination of the built-in and
auxiliary sensors.
• Built-in room sensor only
• Built-in room sensor with auxiliary rooom sensor(s) (temperature is averaged)
• Auxiliary room sensor only
Floor Sensor for Radiant Floor Heating
If a floor sensor is connected, floor minimum and maximum settings are available.
For a combination of air and floor temperature control, leave the internal air sensor on
in the setup menu. A floor minimum can be used to prevent a fast drop in temperature
caused by receding solar exposure. This operation is recommended for areas heated