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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
psi [Gauge] (
0.101 MPa).
–
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. 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) L eak test
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 conditioner for cooling.
Note:
In case of adding refrigerant, comply with the quantity specified for the refrigerating cycle.
CAUTION:
When charging the refrigerant system with additional refrigerant, be sure to use liquid refrigerant.
Adding gas refrigerant may change the composition of the refrigerant in the system and affect
normal operation of the air conditioner. Also, 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
104°F (40°C)) during cold season. But never use naked fire or steam.
4-3. LOCKING THE OPERATION MODE OF THE AIR CONDITIONER (COOL, DRY, HEAT)
• Description of the function:
With this function, once the operation mode is locked to either COOL/DRY mode or HEAT mode,
the air conditioner operates in that mode only.
* Changing the setting is required to activate this function. Please explain about this function to
your customers and ask them whether they want to use it.
[How to lock the operation mode]
1) Be sure to turn off the main power for the air conditioner before making the setting.
2) Set the "3" of SW1 on the outdoor controller board to ON to enable this function.
3) To lock the operation mode in COOL/DRY mode, set the "4" of SW1 on the outdoor controller
board to OFF. To lock the operation in HEAT mode, set the same switch to ON.
4) Turn on the main power for the air conditioner.
en-7
14.7
–
Valve body
Cap
Valve stem
Valve stem
Service port cap
Close
(Torque 10 to 13 ft-lb,
13.7 to 17.7 N•m, 140
to 180 kgf•cm)
Open
Hexagonal
wrench
Stop valve
for GAS
Precautions when us-
ing the control valve
Body
Close Open
Control valve
A
Charge hose
(for R410A)
Service port
Union
Union
Union
Union
Refrigerant gas
cylinder
operating valve
(for R410A)
SW871
SW2
SW1
ON
1 2 3 4 5 6
COOL/DRY
Compound pressure
gauge (for R410A)
–14.7 psi
Pressure gauge
(–0.101MPa)
(for R410A)
Gauge mani-
fold valve (for
R410A)
Handle
Handle High
Low
Charge hose
(for R410A)
Stop valve cap
(Torque 15 to
Stop valve
22 ft-lb, 19.6 to
for LIQUID
Vacuum pump
29.4 N•m, 200
(for R410A)
to 300 kgf•cm)
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
Stop valve with
Gas
service port
pipe
* D unit is for
4C36NA4 only.
Gauge manifold
valve (for R410A)
Charge hose
(for R410A)
Refrigerant gas cylinder for R410A with siphon
Refrigerant (liquid)
Electronic scale for refrigerant charging
LED
SW1
SW1
ON
1 2 3 4 5 6
HEAT
unit
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