Sequence Of Operation; Heating And Cooling Operation - Tekmar Invita Installation, Operation And Maintenance Manual

Sequence of Operation

Heating and Cooling Operation

• The Heat On symbol is shown on the display when the thermostat is heating .
• Heating for freeze protection is provided whenever the air or floor temperature falls below 40°F (4 .5°C),
regardless of operating mode .
• The Cool On symbol is shown on the display when the thermostat is cooling .
The thermostat supports two heating system types: 1) conventional, or 2) heat pump .
Conventional Systems
A conventional heating system includes: furnaces, air conditioners, hydronic heating systems with
baseboards, radiant floors, or fan coils and electric heating .
The thermostat supports up to two heating stages, two cooling stages, a fan and two accessory relays .
EQUIPMENT SETTING
First stage heating
Second stage heating
First stage cooling
Second stage cooling
Fan
Accessory 1
Accessory 2
Heat Pump Systems
A heat pump system may include additional heat sources as backup . The thermostat supports up to
four heating stages, two cooling stages, a reversing valve, a fan and one accessory relay .
EQUIPMENT SETTING
First stage heating
Second stage heating
Third stage heating
Fourth stage heating
First stage cooling
Second stage cooling
Fan
Accessory 1
Accessory 2
1H/1C
W1
-
Y1
-
Choice of: Humidifier, Dehumidifier, HRV/ERV
Choice of: Humidifier, Dehumidifier
1HP 1HP/1AUX
Y1 Y1
- W1
- -
- -
Y1 Y1
- -
Choice of: Humidifier, Dehumidifier, HRV/ERV ventilator
Reversing valve O relay remains closed during cooling.
Reversing valve B relay remains closed during heating.
1H/2C 2H/1C
W1 W1
- W2
Y1 Y1
Y2 -
G
1HP/2AUX 2HP
Y1 Y1
W1 Y2
W2 -
- -
Y1 Y1
- Y2
G
2H/2C
W1
W2
Y1
Y2
2HP/1AUX 2HP/2AUX
Y1 Y1
Y2 Y2
W1 W1
- W2
Y1 Y1
Y2 Y2
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