Daikin Sky Air R-407C Service Manual page 220

Overview of the heating mode functions
1
Starting and ending
conditions:
RY35-45E(A)Z7V1
2
3
Hot start after
4
defrosting
Used input
5
2–40
Starting conditions
The defrosting starts when all of the following conditions are fulfilled:
The compressor has been running over 40 min
If Ta ≥ 5˚C, outdoor heat exchanger temperature < -3˚C
Outdoor heat exchanger temperature < (Ta x 0,4) - 5˚C.
Ending conditions
The defrosting stops when one of the following conditions is fulfilled:
Defrosting has been running over 10 min, or
Outdoor heat exchanger temperature > 12.5˚C, or
High-pressure switch has been activated, or
Indoor unit has been switched OFF, or
Unit is in another mode than heating.
The hot start function is activated:
40 s after the defrosting ending, or
When Tc > 34˚C (indoor heat exchanger temperature).
The defrost control uses the following inputs:
Input
Outdoor thermistor
Outdoor heat exchanger thermistor
Discharge pipe thermistor
Defrosting start temperature changeover switch
Defrosting forced time changeover switch
Connection on Connection on
indoor PCB outdoor PCB
— R1T
— R2T
— R3T
— DS1-2
— DS2-1
Part 2 – Functional Description
ESIE02–01