Hitachi RAM-71QH5 Service Manual page 35

MODEL RAM-71QH5
• Time chart when executing defrost (Unit 1 and Unit 2 operated, Unit 3 and Unit 4 stopped)
Unit 1
Unit 2
Unit 3
Unit 4
Defrosting signal
Unit 1
Unit 2
Unit 3
Unit 4
Turn on
for heating
15 sec
Outdoor fan
Defrosting Balancing period
inhibit period [TDF414]
Compressor
rotation speed
480
Hold
0
480
Hold
0
30 sec
480
Hold
0
480
0
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30 sec
Reverse cycle period (max [DFMXTM])
Defrosting sequence
[TSKTM2]
[SDRCT2]
[DFCTPS$]
[DFCTPS$]
Hold
Heating
Heating
Defrost request
Defrost request
Balancing period [TDF415]
[DEFMAX]
—1
[DFSTEP]min
/[TDFSPT] sec
[DFPSMX$]
[DFSPPS$] Pulse/[TDFSPT] sec
[DFPSMX$]
[DFSPPS$] Pulse/[TDFSPT] sec
0 Palse
0 Palse
– 44 –
[T_4BEN_DEF]
Start sequence
[TSKTM1_W ]
*
[SDRCT1_W ]
*
[T_DFCTPS]
[PSTARTH2 ]
*
[DFCTPS$]
[PSTARTH2 ]
*
[DFCTPS$]
[PCLOSH$]
[PCLOSH$]