Service manual

ESIE03–01 General Functionality
Part 2 – Functional Description 2–5
3
2
4
5
1
2 Indoor air
return
R1T Cooling P Thermostat control
P Start-up control expansion valve and outdoor
unit fan
P Outdoor fan speed control
Heating
P Thermostat control
P Start-up control expansion valve and outdoor
unit fan
P Integral capacity calculation (to determine
defrost)
P Peak cut-off
3 Outdoor
heat
exchanger
R2T Cooling P Optimise discharge temp. (cond. temp.)
P Outdoor fan speed control (O.L.)
Heating
P Optimise discharge temp. (evap. temp.)
P Defrost start/stop
4 Outdoor
air return
R1T Cooling
P Outdoor fan speed control
P Start-up control expansion valve and outdoor
unit fan
Heating
P Integral capacity calculation (to determine
defrost)
P Start-up control expansion valve and outdoor
unit fan
5 Discharge
pipe com-
pressor
R3T Cooling
P Cooling overload
P Check refrigerant shortage/too much refrigerant
P Expansion valve control
Heating
P Heating overload
P Check refrigerant shortage/too much refrigerant
P Expansion valve control
Ther-
mistor
Location
Wiring
symbol
Mode Function