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4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN
4-1. PURGING PROCEDURES AND LEAK TEST
1) Remove service port cap of stop valve on the side of the outdoor unit gas
pipe. (The stop valves are fully closed and covered in caps in their initial
state.)
2) Connect gauge manifold valve and vacuum pump to service port of stop
valve on the gas pipe side of the outdoor unit.
3) Run the vacuum pump. (Vacuumize for more than 15 minutes.)
4) Check the vacuum with gauge manifold valve, then close gauge manifold
valve, and stop the vacuum pump.
5) Leave as it is for one or two minutes. Make sure the pointer of gauge manifold
valve remains in the same position. Confirm that pressure gauge shows
-0.101 MPa [Gauge] (-760 mmHg).
6) Remove gauge manifold valve quickly from service port of stop valve.
7) After refrigerant pipes are connected and evacuated, fully open the valve stem
of all stop valves on both sides of gas pipe and liquid pipe by the hexagonal
wrench. If the valve stem hits the stopper, do not turn it any further. Operating
without fully opening lowers the performance and this causes trouble.
8) Refer to 1-2., and charge the prescribed amount of refrigerant if needed. Be
sure to charge slowly with liquid refrigerant.
9) Tighten cap of service port to obtain the initial status.
10) L eak test
WARNING
To avoid risk of fire, make sure that there are no flammable hazards or
ignition risks before opening the stop valves.
WARNING
When opening or closing the valve
below freezing temperatures,
refrigerant may spurt out from the
gap between the valve stem and the
valve body, resulting in injuries.
4-2. GAS CHARGE
Perform gas charge to unit.
1) Connect gas cylinder to the service port of stop valve.
2) Perform air purge of the pipe (or hose) coming from refrigerant gas cylinder.
3) Replenish specified amount of the refrigerant, while operating the air condi-
tioner for cooling.
Note:
In case of adding refrigerant, comply with the quantity specified for the refrig-
erating cycle.
CAUTION
When charging the refrigerant system with additional refrigerant, be sure
to use liquid refrigerant. Charge the liquid refrigerant slowly, otherwise
the compressor will be locked.
To maintain the high pressure of the gas cylinder, warm the gas cylinder
with warm water (under 40°C) during cold season. But never use naked
fire or steam.
Make sure to indicate the followings with ineffaceable ink on the designated
label / spec label.
(1) Precharged refrigerant amount – see spec label
(2) On site additionally charged amount
(3) Total refrigerant amount (1)+(2)
(4) (5) (6) CO
equivalent
2
*1. This information is based on Regulation (EU) No.517/2014.
*2. According to IPCC 3rd edition, GWP is defined as 550.
Valve body
Cap
Valve stem
Model
Indoor unit
A – E
MXZ-5F102VF2
A – D
MXZ-4F83VF2
Valve stem
Service port cap
Close
Open
(Torque 13.7 to 17.7 N•m,
140 to 180 kgf•cm)
Hexagonal
wrench
Stop valve
for LIQUID
Stop valve
for GAS
Precautions when using
the control valve
Body
Close
Open
Control valve
A
Charge hose
(for R32,
Service port
R410A)
<R32>
Make sure to replace the cap after
the operation.
Union
Union
Union
Union
Refrigerant gas
cylinder
operating valve
(for R32, R410A)
Refrigerant (liquid)
(4) = (1) × 675/1000
(5) = (2) × 675/1000
(6) = (3) × 675/1000
Compound pressure
gauge (for R32, R410A)
–0.101MPa
(–760 mmHg)
Pressure gauge
(for R32, R410A)
Gauge manifold
valve (for R32,
R410A)
Handle High
Handle Low
Charge hose (for
R32, R410A)
Stop valve cap
(Torque 19.6 to
29.4 N•m, 200 to
300 kgf•cm)
Vacuum pump
(for R32, R410A)
When attaching the control valve
to the service port, valve core may
deform or loosen if excess pressure
is applied. This may cause gas leak.
When attaching the control valve to
the service port, make sure that the
valve core is in closed position, and
then tighten part A. Do not tighten part
A or turn the body when valve core is
in open position.
Stop valve
Liquid
pipe
Indoor
Outdoor
unit
unit
Stop valve with
Gas
service port
pipe
Gauge manifold
valve (for R32,
R410A)
Charge hose (for
R32, R410A)
Refrigerant gas cylinder for R32, R410A with
siphon
Electronic scale for refrigerant charging
en
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