Vacuum Pumping And Charging Refrigerant - Hisense AVW-48UESC Installation & Maintenance Manual

Spindle Valve Torque (N m)
Gas
4
<Gas Valve>
Do not apply two spanners
at this posotion.If applied,
leakage will occur
Check Joint
( )
Only the charging hose
can be connected
Tighten the cap with a
torque below.
.
Liquid Valve:16N m Cap
Tighten the cap with a
torque below.
(Attach this after work)
.
Gas Valve:49N m
.
Liquid Valve:37N m
O-Ring
(rubber)
Refrigerant Piping
Hexagonal
Wrench(Size:4mm)
( )
To open or close
spindle valve
Hexagonal Wrench Size (mm)
Gas
G Do not apply an abnormal big force to
the spindle valve at the end of opening
(5.0N-m or smaller).
The back seat construction is not provided.
G Do not loosen the stop ring. If the stop ring
is loosened, it is dangerous, since the
spindle will hop out.
(5) Connect the gauge mani-fold using
charging hoses with a nitrogen cylinder to
the check joints of the liquid line and the
gas line stop valves.
Perform the air-tight test.
Do not open the stop valves. Apply
nitrogen gas pressure of 4.15MPa.
(6) Check for any gas leakage at the flare nut
connections, or brazed parts by gas leak
detector or foaming agent.
(7) After the air tight test, release nitorogen
gas.
.
Liquid
open the stop valve spindle cap to make sure valve is closed
Use two spanners
here to squeeze
flare nut
Spindle Valve
Counterclockwise
. . ..
Open
. . ..
Clockise Close
Close before shipment
Ref.Pressure
Refrigerant Piping
Liquid Stop Valve
Liquid
After pipe and nut cap are connected,when test the air-tight ,
already(clock wise).
Tighten nut cap below torque,great torque will bring on
G
refrigerant leakage of valve spindle.
Pipe Diameter
Make air-tight test after valve spindle turn off closely.
G
Note:
Do not connect nut cap on test joint,supply for connecting
refrigerant charging hose.
capacity when connect jonit cap and valve cap opened
together "pu chi" light sound.
5.6 Vacuum Pumping and charge refrigerant
(1) Connect a mani-fold gauge to the check
joints at the both sides.
Continue vacuum pumping work until the
pressure reaches 756mmHg or lower for
one to two hours.
After vacuum pumping work, stop the
mani-fold valve's valve, stop the vacuum
pump and leave it for one hour. Check to
ensure that the pressure in the mani-fold
gauge does not increase.
Note:
1. This unit is only for the refrigerant R410A. The
manifold gauge and the charging hose should
be exclusive use for R410A.
2. If vacuum degree of -0.1MPa (756mmHg) is
not available, it is considered of gas leakage or
entering moisture. Check for any gas leakage
once again. If no leakage exists, operate the
vacuum pump for more than one to two hours.
(2) Connect adjusting valve and charge kettle to
check joint of liquid valve.
(3) Fully open the gas valve and liquid valve slowly.
(4) Open adjusting valve to add refrigerant (must be
refrigerant is liquid).
(5) Operate cool mode,charge stated refrigerant.
(6) Confirm the capacity of charging refrigerant with
Weighing meter.An excess or a shortage of
refrigerant is
(7) Fully open the liquid valve.
14
Tighten Torque
It has no effect for system
cause of trouble to the units.