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DEFROST
Reversing valve defrost system is employed: it consists of balancing period reversing cycle period balancing period.
When all the following conditions are established defrost is executed:
Normal operation
Defrost start condition
(1)
Defrost inhibit period linked to outdoor temperature has passed.
Heat exchange temperature is within defrost range specified by outdoor temperature and heat exchange temperature.
1
3
2
If any one of the following conditions is established, defrost is released:
Defrost release condition
(2)
Outputs during defrost
(3)
Indoor defrost request: Transmitted to all units being operated in heating mode.
Electric expansion valve
Unit being stopped : [FULL CLOSE] 30 seconds after balancing period has passed [FULL CLOSE] during
reversing cycle period [PCLOSH$] 15 seconds before balancing period is finished
Unit being operated : [DFCTPS] 30 seconds before balancing period is finished Synchronized with step-up
of rotation speed of compressor, opened by [DFSPPS] pulses and reaches MAX opening
degree [DEFSMX] when rotation speed of compressor reaches [DEFMAX].
Compressor : Balancing period for [TDF414] seconds Starting of reversing cycle period by [SDRCT2] min
-1
for
Released by condition 1 or 2 during reversing cycle period: [TDF415] Shifted to balancing period.
[TSKTM2] seconds Accelerating by [DFSTEP]min
-1
/[TDFSPT] seconds in remaining reversing cycle
period until defrost MAX speed [DEFMAX] is reached Balancing period for [TDF415] seconds
Released by condition 1 during balancing period: When remaining balancing period has elapsed, returned to initial
condition (ASTUS=0).
above graph is showing the ideal value by micon program.
Heat exchange temperature returns (heat exchange temperarure
≥
DEFOFF).
Defrost max time of 12 minutes has elapsed.
1
2
RAM-130QH5 DEFROST TEMPERATURE
OUTDOOR (˚C)
-20
-10
10
20
0
0
-10
10
-20
20
HEA
T EXCHANGER (˚C)
DEFROST
START
TEMPERATURE
DEFROST END
TEMPERATURE
Summary of Contents for RAM-130QH5
Page 10: ... 11 SIX ROOM SYSTEM MULTI R A C RAM 130QH5 CONNECTING POSISION TO BE ABLE TO INSTALL ...
Page 20: ... 22 CAPACITY DIAGRAM RELATED TO THE PIPING LENGTH MODEL RAM 130QH5 ...
Page 25: ... 29 6V01 ...
Page 26: ... 31 ...
Page 28: ... 35 ...
Page 33: ... 41 Outdoortemperature STAROTP_C TSKTM1_C1 Outdoortemperature STAROTP_C TSKTM1_C2 ...
Page 34: ... 43 ...
Page 35: ... 45 ...
Page 36: ... 47 ...
Page 37: ... 49 ...
Page 47: ... 59 5A ...
Page 54: ... 66 ...
Page 55: ... 67 5 Reversing valve control circuit Fig 5 1 ...
Page 77: ... 92 TROUBLESHOOTING OF THE SYSTEM POWER MODULE ...
Page 78: ... 93 ...
Page 79: ... 94 ...
Page 83: ... 98 ...
Page 84: ...HITACHI PM NO 0000 Printed in Malaysia RAM 130QH5 ...