V6-i VRF 50/60Hz
39
P
art
3
- Con
tr
ol
Table 3-5.2: Component control during heating operation
Component
Wiring
diagram
label
8-12HP 14-18HP 20-24HP 26-28HP 30-32HP
Control functions and states
Inverter compressor A
COMP(A)
●
●
●
●
●
Controlled according to load requirement
Inverter compressor B
COMP(B)
●
●
●
DC fan motor A
FANA
●
●
●
●
●
Controlled according to outdoor ambient
temperature, outdoor heat exchanger pipe
temperature, discharge pressure and load
requirement
DC fan motor B
FANB
●
●
●
Electronic
expansion
valve A
EXVA
●
●
●
●
●
Position (steps) from 0 (fully closed) to 480
or 3000 (fully open), controlled according to
discharge superheat
Electronic
expansion
valve C
EXVC
●
●
●
●
●
Position (steps) from 0 (fully closed) to 480
(fully open), controlled according to
temperature different between plate heat
exchanger inlet and outlet
Four-way valve
ST1
●
●
●
●
●
On
Solenoid
valve
(oil
balance)
SV4
●
●
●
●
●
Open regularly
Solenoid
valve
(fast
defrosting (in cooling)
and
unloading
(in
heating))
SV5
●
●
●
●
●
Controlled
according
to
ambient
temperature, discharge pressure, discharge
temperature,
compressor
running
frequency and discharge superheat
Solenoid valve (EXV
bypass)
SV6
●
●
●
●
●
Off
Solenoid valve (indoor
units bypass)
SV7
●
●
Controlled according to load requirement
Solenoid valve (inverter
compressor A vapor
injection)
SV8A
●
●
●
●
Controlled according to inverter compressor
A on/off
Solenoid valve (inverter
compressor B vapor
injection)
SV8B
●
●
Controlled according to inverter compressor
B on/off
Solenoid valve (inverter
compressor B pressure
balance)
SV9
●
●
●
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.
