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No. Parts Items Estimation standard
SV4: 2A, 4-core, yellow (from air
discharging pipe to the top of compressor);
SV5: 2A, 4-core, yellow ( from the top of
compressor to air suction pipe）；
when SV4 open and SV5 close, compressor
runs with full load, when SV4 close SV5
open, compressor runs with half load,
current of full load running is over than
running with half load
master unit SV6：
1. two 6A valve body, 4-core, blue(at the
balance pipe of gas-liquid separator)
2. basic control: close during cooling, open
during normal heating, close during oil
equalization in heating
1
Solenoid
valve
If there is wrong
installation of coil
or valve body,
electrify the unit
and check if the
valve body or the
connected pipe
is blocked, or if
there is plenty of
refrigerant enter
compressor due
to the valve body
can not be
closed
master unit SV7: 2A valve body, 3-core,
yellow wire with white terminals（oil return
capillary of gas segregator ）
slave unit SV7: 2A, 4-core, blue(oil return
capillary of gas segregator）
In operation, compressor will run; in unit
stop, compressor will stop too. In running,
capillary temperature behind the valve
should be lower than ambient temp., or the
capillary is blocked or the valve does not
open
No. Parts Items Estimation standard
Part 2
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