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Table 3-5.2: Component control during heating operation
Component
Inverter compressor A
Inverter compressor B
DC fan motor A
DC fan motor B
Electronic
expansion
valve A
Electronic
expansion
valve C
Four-way valve
Solenoid valve (liquid
refrigerant injection)
Solenoid
valve
(oil
balance)
Solenoid
valve
(fast
defrosting (in heating)
and
unloading
(in
cooling))
Solenoid
valve
(EXV
bypass)
Solenoid valve (indoor
units bypass)
Solenoid valve (inverter
compressor
A
vapor
injection)
Solenoid valve (inverter
compressor
B
vapor
injection)
Solenoid valve (inverter
compressor B pressure
balance)
Wiring
diagram
8-12HP
14-18HP
label
COMP(A)
●
●
COMP(B)
FANA
●
●
FANB
EXVA
●
●
EXVC
●
●
ST1
●
●
SV2
SV4
●
●
SV5
●
●
SV6
●
●
SV7
●
SV8A
●
●
SV8B
SV9
20-24HP
26-28HP
30-32HP
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
45
Control functions and states
Controlled according to load requirement
Controlled according to outdoor ambient
temperature, outdoor heat exchanger pipe
temperature, discharge pressure and load
requirement
Position (steps) from 0 (fully closed) to 480
or 3000 (fully open), controlled according to
discharge superheat
Position (steps) from 0 (fully closed) to 480
(fully
open),
controlled
temperature different between plate heat
exchanger inlet and outlet
Off
Only open if discharge temperature > 100
Open regularly
Controlled
according
temperature, discharge pressure, discharge
temperature, compressor running frequency
and discharge superheat
Off
Controlled according to load requirement
Controlled according to inverter compressor
A on/off
Controlled according to inverter compressor
B on/off
Open before compressor B startup and close
after compressor B running for 15 seconds.
Open after compressor B stop 10 seconds
and keep open 60 seconds.
according
to
C
o
to
ambient
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