Daikin Sky Air R-407C - Functions of Thermistors: Small Heat Pumps

General Functionality ESIE02–01
2–4 Part 2 – Functional Description
3
1
2
4
5
1.2 Functions of Thermistors: Small Heat Pumps
Locating the
thermistors
The thermistors on the illustration below are used to control the system. This control secures a proper
operation and prevents problems of the unit.
Functions of the
thermistors
The table below contains the functions of the small h/p.
1
2
3
4
Outdoor unit
Indoor unit
Ther-
mistor
Location
Wiring
symbol
Mode Function
1Indoor heat
exchanger
R2T Cooling Freeze-up thermostat
Heating
■ Hot start indoor fan
■ Peak cut-off
2Indoor air
return
R1T Cooling Thermostat control
Heating Thermostat control
3 Outdoor heat
exchanger
R2T Cooling Not used
Heating
■ Frost prevention and overload prevention
■ Defrost initiation and termination
4 Outdoor air
return
R1T Cooling Low ambient control
Heating
■ Frost prevention
■ Defrost initiation