Hitachi RAS-20CNHZ2 - Page 53

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Defrosting signal
Unit 1
Unit 2
Unit 1
Unit 2
Unit 2
Unit 2
Unit 1
Unit 1
Turns on for
cooling
Cooling output
Heating output
Outdoor fan
Compressor
rotation speed
480
480
0
0
Electric expansion valve
Reversing
valve
Request
Compressor
Operation
Defrosting inhibit period
15sec.
Balancing period [TDF414] sec.
30sec.
TSKTM2
SDRCT2
Reverse cycle period (max. 12 minutes)
Defrosting sequence
DFSTEPrpm/
TDFSPT sec.
DEFMAX
Balancing period [TDF415] sec. TSKTM1
Start sequence
SDRCT1
PSTART
PSTART
DFCTPS
DFCTPS
DFCTPS
DFSPPS Pulse
Hold
Hold
Hold 500ms
Hold 500ms
DFSPPS Pulse
DFPSMX
DFPSMX
DFCTPS
Defrosting request
30sec.
Defrosting request
●
Time chart when executing defrost (both unit 1 and unit 2 operated)
Defrosting signal
Unit 1
Unit 2
Unit 1
Unit 2
Unit 2
Unit 2
Unit 1
Unit 1
Turns on for
cooling
Cooling output
Heating output
Outdoor fan
Compressor
rotation speed
480
480
0
0
Electric expansion valve
Reversing
valve
Request
Compressor
Operation
Defrosting inhibit period
15sec.
Balancing period [TDF414] sec.
30sec.
TSKTM2
SDRCT2
Reverse cycle period (max. 12 minutes)
Defrosting sequence
DFSTEPrpm/
TDFSPT sec.
DEFMAX
Balancing period [TDF415]sec. TSKTM1
Start sequence
SDRCT1
PSTART
DFCTPS
DFCTPS
DFSPPS Pulse
Hold
Hold 500ms
PCLOSH
PCLOSH
DFPSMX
30sec.
Defrosting request
●
Time chart when executing defrost (Only unit 1 operated, unit 2 stopped)