Mitsubishi Electric MXZ-3F54VF Notice D'installation page 10

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) Fully open all stop valves on the gas pipe and the liquid pipe. Oper-
ating 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
To avoid risk of fire, make sure that there are no flammable
hazards or ignition risks before opening the stop valves.
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. Adding gas refrigerant may change the composition of the refriger-
ant 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 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.
En-9
WARNING
Stop valve cap
*4 to 5 turns
(Torque 21.5 to
27.5 N•m, 220
*Close
to 280 kgf•cm)
*Open
Hexagonal wrench
Service port cap
(Torque 13.7 to
17.7 N•m, 140 to
180 kgf•cm)
Stop valve
for GAS
Close Body
A
Open
Service port
Control
valve
Charge hose
(for R32,
R410A)
<R32>
Make sure to replace the cap after
the operation.
Union
Union
Union
Union
Refrigerant gas
cylinder operat-
ing valve
(for R32,R410A)
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)
Stop valve
Vacuum pump
for LIQUID
(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
* D unit is for
4F72VF only.
Gauge manifold
valve (for R32,
R410A)
Charge hose
(for R32,
R410A)
Refrigerant gas cylinder for R32, R410A
with siphon
Refrigerant (liquid)
Electronic scale for refrigerant charging