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
B
Electronic expansion valve
C
Four-way valve
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
14-16HP
label
COMP(A)
●
●
COMP(B)
FANA
●
●
FANB
EXVA
●
●
EXVB
●
EXVC
●
●
ST1
●
●
SV4
●
●
SV5
●
●
SV6
●
●
SV7
●
SV8A
●
●
SV8B
SV9
18-28HP
30-32HP
●
●
Controlled according to load requirement
●
●
Controlled
●
●
temperature,
temperature,
●
●
requirement
●
●
Position (steps) from 0 (fully closed) to 480 (fully
open), controlled according to discharge superheat
●
●
Position (steps) from 0 (fully closed) to 480 (fully
open),
●
●
different between plate heat exchanger inlet and
outlet
On
●
●
Open regularly
●
●
Controlled according to ambient temperature,
discharge
●
●
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.
V6 VRF 50/60Hz
Control functions and states
according
to
outdoor
outdoor
heat
exchanger
discharge
pressure
controlled
according
to
pressure,
discharge
ambient
pipe
and
load
temperature
temperature,
39