Publicité
Les langues disponibles
Les langues disponibles
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 side of the outdoor unit gas pipe.
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 -14.7
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) Leak 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.
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. 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.
Valve body
Cap
Valve stem
CAUTION
Valve stem
Stop valve cap
(Torque 19.6 to
Close
29.4 N•m, 200
Open
to 300 kgf•cm)
Hexagonal
wrench
Service port cap
(Torque 13.7 to
17.7 N•m, 140 to
180 kgf•cm)
Stop valve
for GAS
Precautions when 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, 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 R410A)
Charge hose
(for R410A)
Refrigerant gas cylinder for R410A with siphon
Refrigerant (liquid)
Electronic scale for refrigerant charging
en
6
Publicité
