Controls At Mode Changing / Start-Up; 3 Minutes Stand-By - Daikin Altherma EKHBH Series Service Manual

Outdoor Unit Functional Concept
3.4

Controls at Mode Changing / Start-up

1
Four way valve
operation
compensation
2
3

3 minutes stand-by

4
Compressor
protection function
5
2–16
Heat pump
At the beginning of the operation as the four way valve is switched, acquire the differential pressure
required for activating the four way valve by having output the operating frequency, which is more than
a certain fixed frequency, for a certain fixed time.
Starting conditions
The MRC/W turns ON when the compressor starts for heating after the MRC/W has been OFF with
compressor halted.
The MRC/W turns OFF when the compressor starts for cooling after the MRC/W has been ON with
compressor running.
The compressor starts for the first time after reset.
The compressor starts after suspension caused by the trouble of cooling/heating changeover. Set
the lower limit frequency to 48 Hz for 70 seconds with any conditions 1 through 4 above.
Prohibit to turn ON the compressor for 3 minutes after turning it off. Except when defrosting.
When turning the compressor from OFF to ON, the upper limit of frequency must be set as follows.
The function must not be used when defrosting.
FCG 3
FCG 2
FCG 1
Frequency
FCG3
FCG2
FCG1
TCG120 sec
85
70
55
Time
TCG200 sec TCG470 sec
ESIE06-03
Part 2 – Functional Description