危
险
！
CAUTION
Vacuum
Pumping
Do use Nitrogen.
Air tight procedure
Completion
of
Ref
.
Piping
Repairing
of
Leakage
Part
Check of
Pressure
Decrease
Applying
Nitrogen
Gas
Pass
Procedure
Connect the gauge manifold using charging hoses with a nitrogen
cylinder to check joints of the liquid line and the gas line stop
valves
.
Perform the air
-
tight test
.
Don
'
t
open
the gas line stop valves
.
Apply nitrogen gas pressure of 4
.
15MPa
.
Check
any
gas
leakage
at
the
flare
nut connections
,
or brazed
parts by gas leak detector or foaming agent
.
Gas pressure doesn’t decrease is OK.
After
the
air
tight
test
,
release
nitrogen gas.
6. Vacuum
pumping
and
charge
refrigerant
(1) Each
pipelines
needs
to be evacuated individually.
(2) An
excess
or
a
shortage
of
refrigerant
is
the
main cause
of
trouble
to
the
unit
.
Charge
the
correct
refrigerant
quantity
according to
the
description
of
label
at
the
inside
of
the
manual
.
(3) Check
refrigerant
leakage
in
detail
.
If
a
large refrigerant
leakage
occurs
,
it
will
cause
difficulty with
breathing
or
harmful
gases
will
occur
if
a fire
is
being
used
in
the
room
.
Vacuum pump
-0.101MPa
(-760 mmHg)
manifold gauge
Charge hose
(for R32)
(1) Remove the service port cap of the stop valve on the gas pipe
side of the outdoor unit.
(2) Connect the manifold gauge and vacuum pump to the service port
of the stop valve on the gas pipe side of the outdoor unit.
(3) Run the vacuum pump. (Work for more than 15 minutes)
(4) Check the vacuum with the gauge manifold valve, then close the
gauge manifold valve and stop the vacuum pump.
(5) Leave it as is for one or two minutes. Make sure the pointer of the
manifold gauge remains in the same position. Confirm that the
pressure gauge shows -0.101MPa (or -760mHg).
(6) Remove the manifold gauge quickly from the service port of the
stop valve.
(7) After refrigerant pipes are connected and evacuated, fully open
all stop valves on both sides of gas pipe and liquid pipe.
(8) Open adjusted valve to add refrigerant
(
must be refrigerant
is
liquid
).
(9) Tighten the cap to the service port.
(10) Retighten the cap.
(11) Leak test foam with halogen leak detector to check the flare nut
and brazing Carolina Department leaks. Use foam that not
generates ammonia (NH3) in the reaction.
5. Air Tight Test
Installation instructions
Additional
refrigerant charge
The unit has been filled with refrigerant.
Please according “Piping Requirement” to calculate additional charge.
After vacuum pump procedure has been finished, first exhaust air
from charge hose, then open valves, charge
refrigerant as “liquid” type through Liquid stop valve.
At the end, please close valves and record
the
refrigerant
charging
quantity
.
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