Hitachi RAF-25NH5 Instructions De Service page 195

Time chart when executing defrost (both unit 1 and unit 2 operated)
Defrosting signal
Unit 1
Unit 2
Unit 1
Unit 2
Unit 1
Unit 2
Turns on for
cooling
Cooling output
Heating output
Outdoor fan
Defrosting inhibit period
Compressor
rotation speed
480
Unit 1
0
480
Unit 2
0
Time chart when executing defrost (Only unit 1 operated, unit 2 stopped)
Defrosting signal
Unit 1
Unit 2
Unit 1
Unit 2
Unit 1
Unit 2
Turns on for
cooling
15sec.
Cooling output
Heating output
Outdoor fan
Defrosting inhibit period
Compressor
rotation speed
480
Unit 1
0
480
Unit 2
0
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Defrosting request
Defrosting request
15sec.
Balancing period [TDF414] sec. Reverse cycle period (max. 12 minutes)
30sec. TSKTM2
SDRCT2
Hold 500ms
DFCTPS$
Hold
Hold 500ms
DFCTPS$
Hold
Defrosting request
Balancing period [TDF414] sec. Reverse cycle period (max. 12 minutes)
30sec. TSKTM2
SDRCT2
Hold 500ms
DFCTPS$
Hold
- 224 -
Balancing period [TDF415] sec.
Defrosting sequence
DEFMAX
DFSTEPmin -1 /
TDFSPT sec.
DFPSMX$
DFSPPS$ Pulse
DFPSMX$
DFSPPS$ Pulse
Balancing period [TDF415] sec.
Defrosting sequence
DEFMAX
DFSTEPmin -1 /
TDFSPT sec.
DFPSMX$
DFSPPS$ Pulse
30sec.
＊
TSKTM1_W
Start sequence
SDRCT1_W ＊
$
PSTARTH
DFCTPS$
PSTARTH$
DFCTPS$
30sec.
TSKTM1-W1
Start sequence
SDRCT1_W1
PSTARTH$
DFCTPS$
PCLOSH$