EN-6
4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN
CN105
CN104
3-5.
CONNECTING THE INTERFACE/CONNECTOR CABLE TO THE AIR CONDITIONER
• Connect the INTERFACE/CONNECTOR CABLE to the Indoor electronic control P.C. board of the air conditioner with the connecting cable.
• Cutting or extending the connecting cable of the INTERFACE/CONNECTOR CABLE results in defects in connecting.
Do not bundle the connecting cable together with power supply cord, Indoor/outdoor connecting wire, and/or earth wire.
Keep as much distance as possible between the connecting cable and those wires.
• The thin part of the connecting cable should be stored and placed where customers cannot touch it.
1) Remove the panel and the lower right corner box.
2) Open the covers of the Indoor electronic control P.C. board.
3) Connect the connecting cable to CN105 and/or CN104 on the Indoor elec-
tronic control P.C. board.
Pass the thin part of the connecting cable through the rib as shown in the
figure.
4) Attach the cable clamp provided with Interface to the thick part of the con-
necting cable with a screw 4×16 as shown in the figure.
5) Pass the connecting cable through the rib as shown in the figure.
6) Close the covers of the Indoor electronic control P.C. board.
Be careful not to catch the thin part of the connecting cable in the cover.
Reinstall the panel and the lower right corner box.
WARNING
Fix the connecting cable at the prescribed position securely.
Incorrect installation may cause electric shock, fire, and/or malfunction.
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 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.
Stop valve for
GAS
Stop valve cap
(Torque 19.6 to
29.4 N•m, 200
to 300 kgf•cm)
Vacuum pump (or the vacuum
pump with the function to
prevent the back flow)
Gauge manifold valve
(for R32, R410A)
Compound pressure gauge
(for R32, R410A)
–
0.101 MPa
(
–
760 mmHg)
Handle
Low
Handle High
Adapter for
preventing the
back flow
Charge hose
(for R32, R410A)
*Close
*Open
Hexagonal wrench
Precautions when using the control valve
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.
Service port
Body
Close
<R32>
Open
Control
valve
A
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.
Service port cap
(Torque 13.7 to
17.7 N•m, 140 to
180 kgf•cm)
*4 to 5 turns
3) Run the vacuum pump. (Vacuumize until 500 microns is achieved.)
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 pointer 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.
Stop valve
for LIQUID
Pressure gauge
(for R32, R410A)
Charge
hose
Make sure to re-
place the cap after
the operation.
WARNING
To avoid risk of fire, make sure that there are no flammable
hazards or ignition risks before opening the stop valves.
7) After refrigerant pipes are connected and evacuated, fully open
all stop valves on both sides of gas pipe and liquid pipe. Operat-
ing without fully opening lowers the performance and this causes
trouble.
8) Refer to 1-3., and charge the prescribed amount of refrigerant if
needed. Be sure to charge slowly with liquid refrigerant. Otherwise,
composition of the refrigerant in the system may be changed and
affect performance of the air conditioner.
9) Tighten cap of service port to obtain the initial status.
10) Leak test
Connecting
In case of simultaneous connection of CN104 and CN105.
Air conditioner
Thin part of the connecting cable.
Place this part where customers cannot touch it.
Thick part of the
connecting cable
Indoor electronic
control P.C. board
CN105 for INTERFACE
CN104 for CONNECTOR CABLE
Bundle CN105 and CN104
cables with cable tie.
Clamp to CN105 and fix it
with a screw.
CN105
CN104
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