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Operation explanation and applied data, etc.
12. Defrost
3) For the slave outdoor units
control
• The compressors 1 and 2 are kept on. Should
(reverse
defrost
• After the signal to finish the defrost operation
method)
• The capacity of the compressors is controlled
(5) SV41, 42 low-pressure release control
This prevents the low-pressure level relaxing during
the defrost control operation. The master outdoor
units and slave outdoor units have their own control
over this action when the defrost/heating operation
is in progress.
1) Control details
When PS pressure ≤ 0.5 kgf/cm
switches SV41 and SV42 on.
When PS pressure ≥1.0 kgf/cm
are switched off.
13. Cold draught
(1) During the heating operation, the indoor fan is
prevention
controlled according to the temperature that is
control
detected by TC2 (indoor heat exchange sensor).
(°C)
30
26
20
16
(1) To prevent the IDU heat exchanger remaining hot
14. IDU
exchanger
after operation has stopped the indoor fan operates
heat removal
in low fan speed for approximately 30 seconds.
Outline of Control
Outdoor Units
they be off they will be switched on.
is received from the master outdoor units, the
4-way valves become switched on.
according to the on/off signals from the master
outdoor units thereon.
A
A zone: set fan operation
B
B zone: low fan speed
C
C zone: OFF
41
2
G, the control
2
G, SV41, and 42
• "Preheat defrost"
light displayed
from the remote
controller
Remarks
11
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