Hitachi RAC-25YH4, Service Manual, Page: 55 / 121

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2min. 30sec.
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 temperature 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 12 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.
Sleep Lo
Notes:
(1) The sleep operation starts when the sleep button is pressed.
(2) When the sleep button is set, the maximum compressor speed is limited to WBEMAX, and the indoor fan is
set to "sleep Lo".
(3) The indoor fan speed does not change even when the fan speed mode is changed. (Sleep Lo)
(4) When defrosting is to be set during sleep oepration, defrosting is engaged and sleep operation is restored
after defrosting.
(5) If sleep operation is cancelled by the cancel button or sleep button, all data is cleared.
Reversing Valve Defrosting
Preheating released
Reversing valve
(cooling "on" model)
Heating Sleep Operation
Upper limit WBEMAX
Sleep button
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