Dehumidifying; Cooling Defrost - Hitachi RAS-25CNH1 Service Manual

Room temperature
30 sec.
judgement
Room temperature
Cooling preset
temperature
Start/Stop Switch
Operation lamp
Humidity judgement
High humidity
Thermostat judgement
Hi
5 min. OFF/1 min. ON
Indoor fan Med
Lo
15 sec.
Hi
Outdoor fan Med
Lo
Reversing valve
1 min.
3000
SDMAX
SDRPM
Note:
(1) 30 seconds after the operation is started, when the room temperature is (cooling preset temperature) – (1.33˚C) or less, the operation is done assuming as the preset
temperature = (room temperature at the time) – (2˚C).
(2) The indoor fan is operated in the "Lo" mode, OFF for 5 minutes and ON for 1 minute (at high humidity) or OFF for 6 minutes and ON for 1 minute (at low humidity),
repeatedly according to the humidity judgement when the thermostat is turned OFF.
(3) When the operation is started by the themostat turning ON, the start of the indoor fan is delayed 32 seconds after the start of compressor operation.
(4) The compressor is operated forcedly for 3 minutes after operation is started.
(5) The miniumu ON time and OFF time of the compressor are 3 minutes.

Dehumidifying

Room temperature
judgement
30 sec.
Low humidity
6 min. OFF/1 min. ON 32 sec.
15 sec.
1 min. 1 min.
TEIOF
TEION
Thermostat
judgement
Indoor fan
Outdoor fan
Compressor rotation
speed
32 sec.
15 sec. 15 sec.
1 min.

Cooling defrost

Indoor unit heat exchager temperature
Thermostat OFF
Hi
Refer to the basic operation.
Med
Lo
15 sec.
minimum 3 min.
Note: (1) Compressor stop time is 3 minutes minimum.
Note:
1. Refer to data in page 41 Table 1 for each constant shown by capital letters in the diagram.
1 min.
3000
min -
1
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