ESIE02–01 General Functionality
Part 2 – Functional Description 2–5
3
2
4
5
1
1.3 Functions of Thermistors: Large 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 thermistor functions of the large h/p.
p <
p >
1
2
5
3
4
Outdoor unit
Indoor unit
Ther-
mistor
Location
Wiring
symbol
Mode Function
1Indoor
heat
exchanger
R2T Cooling
■ Optimise discharge temp. (evap. temp.)
■ Freeze-up thermostat
Heat-
ing
■ Optimise discharge temp. (cond. temp.)
■ Integral capacity calculation (to determine
defrost)
■ Hot start indoor fan
■ Peak cut-off
■ Outdoor unit fan control
2Indoor air
return
R1T Cooling
■ Thermostat control
■ Start-up control expansion valve and outdoor
unit fan
■ Outdoor fan speed control
Heat-
ing
■ Thermostat control
■ Start-up control expansion valve and outdoor
unit fan
■ Integral capacity calculation (to determine
defrost)
■ Peak cut-off
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