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4. PURGING PROCEDURES, LEA TEST, AND TEST RUN
4-1. PURGING PROCEDURES AND LEA 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 side of the outdoor unit gas pipe.
3) Run the vacuum pump. (Vacuumize for more than 15 minutes.)
4) Chec the vacuum
ith gauge manifold valve, then close gauge manifold
valve, and stop the vacuum pump.
5) Leave as it is for one or t o minutes. Ma e sure the pointer of gauge manifold
valve remains in the same position. Confirm that pressure gauge sho s -14.7
psi [Gauge] (-0.101 MPa).
6) Remove gauge manifold valve quic ly 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
rench. If the valve stem hits the stopper, do not turn it any further. Operating
w ithout fully opening low ers the performance and this causes trouble.
8) Refer to 1-2., and charge the prescribed amount of refrigerant if needed. Be
sure to charge slow ly w ith liquid refrigerant. Otherw ise, 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
WARNING
W h e n o p e n i n g o r c l o s i n g t h e v a l v e
b e l o w
fre e z i n g t e m p e ra t u re s ,
re fri g e ra n t m a y s p u rt o u t fro m
t h e
g a p b e t w e e n t h e v a l v e s t e m
a n d t h e
v a l v e b o d y , re s u l t i n g i n i n j u ri e s .
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, hile operating the air conditioner for cooling.
N o t e :
In case of adding refrigerant, comply ith the quantity specified for the refrigerating cycle.
C A U T I O N :
When charging the refrigerant system w ith 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 slow ly, otherw ise the
compressor w ill be locked.
To maintain the high pressure of the gas cylinder, w arm the gas cylinder w ith w arm w ater (under
104
(40 C)) during cold season. But never use na ed fire or steam.
4-3. REMOVING THE MAINTENANCE PANEL
The setting of Dip Sw itch on the outdoor controller board can be changed
ithout removing the front panel.
ollo the procedures belo to remove the maintenance panel and set
the Dip Sw itch.
1) Remove scre (s) hich fix the maintenance panel.
2) Remove the maintenance panel, and perform necessary settings.
3) Install the maintenance panel.
N o t e :
Ma e sure to fix the maintenance panel securely. Incomplete installation
could cause malfunction.
Valve body
Cap
Valve stem
Valve stem
Stop valve cap
(Torque 19.6 to
Close
29.4 N•m, 200
Open
to 300 kgf•cm)
Hexagonal
w rench
Service port cap
(Torque 13.7 to
17.7 N•m, 140 to
180 kgf•cm)
Stop valve
for GAS
Precautions w hen us-
ing the control valve
Body
Close
A
Open
Control
Service port
valve
Charge hose
(for R410A)
Union
Union
Union
Union
Refrigerant gas
cylinder
operating valve
(for R410A)
Maintenance panel
Compound pressure
–0.101MPa
gauge (for R410A)
(–760 mmHg)
Pressure gauge
(for R410A)
Gauge manifold
valve (for R410A)
Handle High
Handle
Low
Charge hose
(for R410A)
Stop valve
Vacuum pump
for LIQUID
(for R410A)
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, ma e sure that the
valve core is in closed position, and
then tighten part A. Do not tighten
part A or turn the body
hen valve
core is in open position.
Stop valve
Liquid
pipe
Indoor
Outdoor
unit
unit
Stop valve ith
Gas
service port
pipe
Gauge manifold
valve (for R410A)
Charge hose
(for R410A)
Refrigerant gas cylinder for R410A w ith siphon
Refrigerant (liquid)
Electronic scale for refrigerant charging
e n
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