Hitachi RAS-50YH4 Service Manual page 49

Reversing Valve Defrosting
TDF 431
TDF TDF TDF
413 TDF421 1 min
411 412
WMAX
DFMAX
TDF
422 STARCPL
WMIN
Notes:
(1) The defrosting inhibit period is set as shown in the diagram below. When defrosting has
finished once, the inhibit period is newly set, based on the outdoor temperature when the
compressor was started. During this period, the defrost signal is not accepted.
(2) If the difference between the room and outdoor temperatures is large when defrosting is
finished, the maximum compressor speed (WMAX) or (WMAX2) can be continued for 120
minutes maximum.
(3) The defrosting period is 20 minutes maximum.
(4) When operation is stopped during defrosting, it is switched to auto refresh defrosting.
(5) Auto refresh defrosting cannot be engaged within 15 minutes after operation is started or
defrosting is finished.
Setting Defrosting Inhibit Period
D F T I M 3
D F T I M 2
– 1 0 – 5˚C 0˚C
Notes:
(1) The first inhibit time after operation start is set to DFTIM1.
(2) From the second time onwards, the inhibit time is set according to the time required for
defrosting.
Reverse cycle operation time ≥ [DEFCOL] : DEFTIM1 is set.
Reverse cycle operation time < [DEFCOL] : The time corresponding to outdoor tempera-
ture is set.
-1 -1
4000min 4000min 4000min
STARCPL
D F T I M 1
Outdoor temperature
Heating Sleep Operation
0.5hr
Set to 7 hours
Sleep key
Operation lamp
[SLEEP] on the remote
controller is lit
Timer lamp
Hi
Med
Indoor fan
Lo
Silent
See basic
Sleep operation
See basic
Med
operation
Outdoor fan
Facing up
Vertical air
Horizontal
deflector
Shut
Maximum speed = WBEMAX
Compressor speed
Notes:
(1) The sleep operation starts when the sleep key is pressed.
(2) When the sleep key is set, the maximum compressor speed is limited to WBEMAX, and the indoor fan
is set to "Sleep Silent" (FWSOY).
(3) If the operation mode is changed during sleep operation, the changed operation mode is set and sleep
control starts.
(4) The indoor fan speed does not change even when the fan speed mode is changed. (Lo)
(5) When defrosting is to be set during sleep operation, defrosting is engaged and sleep operation is restored
after defrosting.
(6) When operation is stopped during sleep operation, the set temperature when stopped, as well as the time,
continue to be counted.
(7) If the set time is changed during sleep operation, all data including set temperature, time, etc. is cleared
and restarted.
(8) If sleep operation is cancelled by the cancel key or sleep key all data is cleared.
(9) There is no preset temperature shift due to time elapse.
NOTE
1. Refer to the PWRITE-ZU data for the constants expressed by capital alphabet letters
in the drawing.
6.5hr
Lo
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