Daikin Sky Air R-407C, Service Manual, Page: 185 / 304

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
1 Indoor
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
2 Indoor 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