Daikin FHC45BZ7V1, Service Manual

Page: 219 / 304

ESIE02–01 Overview of the heating mode functions
Part 2 – Functional Description 2–39
3
2
4
5
1
Defrost control
RYP71-250B The illustration below shows the defrost control.
Defrost ending
RYP71-250B The defrost operation ends:
■
After 10 min, or
■
As soon as one of the following conditions is met after 1 min or more:
- Outdoor heat exchanger temp.
≥
10˚C
- Discharge pipe temp. > 120˚C.
Note Control and time Description
1 Motorized valve control
during defrost operation After a defrost activation, the defrost motorized valve is at
480 pulses for a certain amount of time, and is then closed
gradually to 100 pulses.
Only when the discharge pipe temperature is high during
defrost, the motorized valve opens at intervals.
2 Motorized valve control
after defrost operation The motorized valve is controlled to an optimum opening
and the most suitable operating speed, according to the
operating conditions at defrost activation.
3 Outdoor unit fan
after defrost operation The fan operates at optimum fan tap, according to the oper-
ating conditions at defrost activation.
4 Hot start after defrost The unit remains in the hot start standby (indoor unit fan
OFF) mode for:
■
40 s after defrost ending, or
■
Until the indoor heat exchanger temperature increases.
10˚C
480
400
300
200
100
Defrosting start Defrosting ending
Outd. unit heat
exchager temp. (Tc)
Compressor
4-way valve
Motorized valve
Outd. unit fan
Ind. unit fan
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Note 4
Note 3
Note 1
Note 2