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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 tempera-
tures, refrigerant may spurt out
from the gap between the valve
stem and the valve body, result-
ing 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 conditioner
for cooling.
Note:
In case of adding refrigerant, comply with the quantity specified for the refrigerat-
ing 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.
4-3. REMOVING THE MAINTENANCE PANEL
The setting of Dip Switch on the outdoor controller board can be changed
without removing the front panel.
Follow the procedures below to remove the maintenance panel and set
the Dip Switch.
1) Remove screw(s) which fix the maintenance panel.
2) Remove the maintenance panel, and perform necessary settings.
3) Install the maintenance panel.
Note:
Make sure to fix the maintenance panel securely. Incomplete installation
could cause malfunction.
Open
Hexagonal wrench
Control
valve
Valve
Cap
body
Valve stem
Stop valve cap
(Torque 21.5 to
Close
Valve stem
27.5 N•m, 220
to 280 kgf•cm)
Service port cap
(Torque 13.7 to
17.7 N•m, 140 to
180 kgf•cm)
Stop valve
Stop valve
for LIQUID
for GAS
Close
Body
A
Open
Service port
Charge hose
(for R32,
R410A)
<R32>
Make sure to replace the cap after
the operation.
Union
Union
Union
Union
Refrigerant gas
cylinder operating
valve
(for R32, R410A)
Refrigerant gas cylinder for R32, R410A
with siphon
Refrigerant (liquid)
Maintenance panel
Compound pressure
gauge (for R32, R410A)
–0.101MPa
(–760 mmHg)
Pressure gauge
(for R32, R410A)
Gauge manifold
valve (for R32,
R410A)
Handle
Handle High
Low
Charge hose (for
R32, R410A)
Vacuum pump
(for R32, R410A)
Precautions when using the control
valve
When attaching the control valve
to the service port, valve core may
deform or loosen if excess pres-
sure 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
Outdoor
Indoor
unit
unit
Stop valve with
Gas
service port
pipe
Gauge manifold
valve (for R32,
Charge hose
R410A)
(for R32,
R410A)
Electronic scale for refrigerant charging
En-9
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