Functions Of Thermistors: Large Heat Pumps - Daikin Sky Air R-407C Service Manual

ESIE02–01
1.3

Functions of Thermistors: Large Heat Pumps

Locating the The thermistors on the illustration below are used to control the system. This control secures a proper
thermistors operation and prevents problems of the unit.
Outdoor unit
4
Functions of the The table below contains the thermistor functions of the large h/p.
thermistors
Ther-
mistor
1
2
Part 2 – Functional Description
3
p >
5
Wiring
Location Mode
symbol
Indoor R2T Cooling
heat
exchanger
Heat-
ing
Indoor air R1T Cooling
return
Heat-
ing
p <
Function
Optimise discharge temp. (evap. temp.)
Freeze-up thermostat
Optimise discharge temp. (cond. temp.)
Integral capacity calculation (to determine
defrost)
Hot start indoor fan
Peak cut-off
Outdoor unit fan control
Thermostat control
Start-up control expansion valve and outdoor
unit fan
Outdoor fan speed control
Thermostat control
Start-up control expansion valve and outdoor
unit fan
Integral capacity calculation (to determine
defrost)
Peak cut-off
General Functionality
2
Indoor unit
1
2
2–5
1
3
4
5