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No. Parts Items Estimation standard
SV1：
1. 6A unloading valve,3-core, red（discharging
from high pressure side of oil segregator to low
pressure side of gas segregator），after system
being electrified, pipe become hot, under the
situation that unloading valve be close for long
time, check the temp. behind unloading valve, if
the temp. is close to ambient temp., the valve is
normal, if the temp. is too high, the valve leaks
2. basic control
before compressor startup, unloading valve
open, after compressor startup, unloading valve
close
Toi l≤Ps＋15ºC and Td≥90 ºC----open; Toil≥Ps
＋20ºC or Td<90ºC------close
in heating mode: Ps≤1.6KG---open,
Ps>2.5KG---close;
in cooling mode: Ps≤0.8KG---open,
Ps>1.2KG----close
1
Solenoi
d 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
SV3：
1. 2A spraying valve,3-core, white（from high
pressure accumulator to compressor suction
pipe）, it will get cool after being electrified;
under the situation that spraying valve be close
for long time, check the temp. behind spraying
capillary, if the temp. is close to ambient temp,
the valve is normal, if the temp. is rath.er low
then the valve leaks
2. basic control
in cooling mode,TD>105ºC—open ,
TD<100ºC----close;
in heating mose,TD>109ºC---open,
TD<105ºC---close
Toi l≥70ºC---open , Toil≤65ºC---close
Part 2
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