Hitachi RAM-90QH5, Service Manual, Page: 38 / 83

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RAM-90QH5
15 sec
30 sec
Heating
Heating
Unit 1
Unit 2
Compressor requirement
Unit 3
Unit 5
Unit 4
Unit 1
Unit 2
Request to Indoor
Reversing
valve
Unit 3
Unit 5
Unit 4
Outdoor fan
Compressor
rotation speed
Turns on
for heating
Defrosting signal
Defrost request Balancing request
Balancing request
Balancing request
Balancing request
Balancing period 3 min.
Target speed
1 room operation
2 rooms
operation
Auto-fresh inhibit period 15min Balancing period [TDF414]
Target speed
Reversing cycle period (max[DFMXTM])
Defrosting sequence
[DEFMAX]
[SDRCT2]
[DFCTPS$]
[TSKTM2]
Hold
480
Unit 1
Unit 2
Expansion valve
Unit 3
Unit 4
Unit 5
0
480
0
480
480
0
480
0
Hold
Hold
Hold
0 Pulse
0 Pulse
0 Pulse Hold
Hold
[DFSPPS$] pulse/[TDFSPT] sec
[DFPSMX$]
[T_TEISI_OPEN]
Hold
0
Hold
0 Pulse
Hold
Hold
[DFSTEP]min
—1
/[TDFSPT] sec