Hisense AMS-07UR4SNVT4 Service Manual page 90

8 . C H E C K I N G C
8 . C H E C K I N G C
Test system flow
Cooling mode
Test system
pressure.Does the low
pressure normal at
service part ?
The pressure on the
low side.
The system wants
refrigerant.The service
people must be ration
refrigerant(about 100g/
per)in the cooling
mode fixed
frequency.Is the low
pressure rise ?
NO
The refrigerant system
blocked.Please check
the Capillary Tube( or
electronic expansion
valve)Is it blocked?
yes
Unsolder the capillary tube
ASS'Y(or electronic expansion
valve).The capillary tube1 is blown
by N .
2
Heating mode
Test system
pressure.Does the
high pressure normal
at service part ?
The pressure on the
low side.
The system wants
refrigerant.The service
NO
people must be ration
refrigerant(about 100g/
per)in cooling mode fixed
frequency state .Is the
high pressure rise in
heating mode?
NO
If the pressure is close
to static pressure?
yes
4-way valve collude or
compressor exhaust every
ebb.
O M P O N E N T S
O M P O N E N T S
The pressure on the
high side.
Recharge refrigerant
after air purging with
the vacuum
pump.Does the low
pressure nomal over
again?
yes
Air remaining at the
refrigerant system.
yes
Recharge refrigerant .
NO
Check check valve and 4-
way valve.
The pressure on the
high side.
Recharge refrigerant
after air purging with
the vacuum
pump.Does the high
pressure normal over
again?
yes
Air remaining at the
refrigerant system.
yes
Recharge refrigerant
NO
If the pressure is
close to static
NO
pressure?
yes
4-way valve collude or
compressor exhaust very
ebb.
NO
Remove the back
panel."see"the
capillary tube1 and
capillary tube2.Is it
defrosting?
yes
The capillary tube
blocked.Unsolder the
capillary tube ASS'Y.The
capillary tube1 and capillary
tube2 is blown by N
Check heat exchanger and
4-way valve.
85
NO
.
2