Mitsubishi Electric PXZ-4F75VG Manual De Instalación página 13

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) 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.
9) Tighten cap of service port to obtain the initial status.
10) L eak test
WARNING
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 *1.
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. 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.
*1. When connecting only the Cylinder unit / Hydrobox / DHW tank, perform cooling
according to the following procedure.
1) Turn off the breaker for outdoor unit and Cylinder unit / Hydrobox / DHW tank both.
2) Turn on 2 for SW2.
3) Turn on the breaker for outdoor unit and Cylinder unit / Hydrobox / DHW tank both.
4) After confirming that all the indoor units have stopped for more than 3 minutes,
press and hold the SW871 on the control board for 3 seconds.
5) To stop operation after refrigerant filling is complete, press and hold the SW871 on
the control board again for 3 seconds.
6) Turn off the breaker for outdoor unit and Cylinder unit / Hydrobox / DHW tank both.
7) Turn off 2 for SW2.
Note:
This function does not operate when the outside temperature is 0°C or below.
Make sure to indicate the followings with ineffaceable ink on the designated label / spec label.
(1) Precharged refrigerant amount – see spec label
(2) On site additionally charged amount
(3) Total refrigerant amount (1)+(2)
(4) (5) (6) CO equivalent
2
*2. This information is based on Regulation (EU) No.517/2014.
*3. According to IPCC 3rd edition, GWP is defined as 550.
Stop valve cap
(Torque 21.5 to
27.5 N•m, 220
Valve stem
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
Stop valve
for LIQUID
for GAS
Body
Close
A
Open
Service port
Control
valve
Charge hose
(for R32,
R410A)
Union
Union
Union
Union
Refrigerant gas
cylinder operating
valve
(for R32, R410A)
LED
SW871
(4) = (1) × 675/1000
(5) = (2) × 675/1000
(6) = (3) × 675/1000
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)
Vacuum pump
(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 pressure 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
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
SW1
SW2
en
11