Hitachi RAM-60QH4 Manuel De Service page 60

• 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
Cooling output
Heating output
Outdoor fan
Defrosting inhibit period
Compressor
rotation speed
480
Unit 1
0
480
Unit 2
0
15sec.
Balancing period [TDF414] sec.
30sec.
Hold 500ms
DFCTPS$
Hold
Hold 500ms
Hold
15sec.
Balancing period [TDF414] sec.
30sec.
Hold 500ms
DFCTPS$
Hold
Defrosting request
Defrosting request
Reverse cycle period (max. 12 minutes)
Defrosting sequence
DEFMAX
TSKTM2
DFSTEPmin /
-1
TDFSPT sec.
SDRCT2
DFSPPS$ Pulse
DFCTPS$
DFSPPS$ Pulse
Defrosting request
Reverse cycle period (max. 12 minutes)
Defrosting sequence
TSKTM2 DEFMAX
DFSTEPmin -1
/
TDFSPT sec.
SDRCT2
DFSPPS$ Pulse
– 72 –
30sec.
Balancing period [TDF415] sec. TSKTM1_W＊
SDRCT1_W＊
DFPSMX$
PSTARTH$
DFCTPS$
DFPSMX$
PSTARTH$
DFCTPS$
30sec.
Balancing period [TDF415] sec. TSKTM1-W1
SDRCT1_W1
DFPSMX$
PSTARTH$
DFCTPS$
PCLOSH$
Start sequence
Start sequence