Mitsubishi Electric MXZ-2B20NA Manual De Instalación página 7

4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN
—0.101MP.
1. PURGING PROCEDURES AND LEAK TEST Stop valve cap GAQIMEa | Compound pressure
i
: :
*4 to 5 turns
(Torque 19.6 to
gauge (for R410A)
1) Remove service port cap of stop valve on the side of the outdoor unit 49 4 Nem 200 to (-30 in.Hg)]
gas pipe. (The stop valve will not work in its initial state fresh out of Close 300 kgfecm, 15 to Pressure gauge
(for R410A)
the facto! Y: totally closed wit cap oO ) ©
© Gauge manifold
2) Connect gauge manifold valve and vacuum pump to service port of 'ny
stop valve on the gas pipe side of the outdoor unit.
3) Run the vacuum pump. (Vacuumize for more than 15 minutes.) ?
Hexagonal! wrench
22 ft-lb)
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 pointer gauge mani-
Charge hose
Service port cap
fold valve remains in the same position. Confirm that pressure gauge (Torque 13.7 to
shows —0.101 MPa [Gauge] [-760 mmHg(-30 in.Hg)]. 17.7 Nem, 140 to ~
6) Remove gauge manifold valve quickly from service port of stop 180 kgfecm, 10 to MUTT
valve. 13 ftelb) Stop valve bait Vacuum pump
7) After refrigerant pipes are connected and evacuated, fully open all for GAS (for R410A)
stop valves on both sides of gas pipe and liquid pipe. Operating with-
out fully opening lowers the performance and this causes trouble. Precautions when usin .
8) Refer to 1-3., and charge the prescribed amount of refrigerant if the control valve 9 When attaching the control valve to
needed. Be sure to charge slowly with liquid refrigerant. Otherwise,
composition of the refrigerant in the system may be changed and af-
fect performance of the air conditioner. , { 4
9) Tighten cap of service port to obtain the initial status. i eS <Service port
10) Leak test
form or loosen if excess pressure is
applied. This may cause gas leak,
<a When attaching the control valve to
== the service port, make sure that the
Charge hose valve core is in closed position, and
(forR410A) then tighten part A. Do not tighten
part A or turn the body when valve
Fy " core is in open position.
Perform gas charge to unit. Stop valve
1) Connect gas cylinder to the service port of stop valve. Liquid pipe
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.
Outdoor
unit
Note: Indoor
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 composi-
tion of the refrigerant in the system and affect normal operation of the air
conditioner. Also, charge the system slowly, otherwise the compressor
will be locked.
To maintain the high pressure of the gas cylinder, warm the gas cylinder Refrigerant gas
with warm water [under 40°C(140°F)] during cold season. But never use cylinder
naked fire or steam. operating valve
(for R410A) \
Stop valve with
service port
Gas pipe
~<a Refrigerant gas cylinder
for R410A with siphon
Refrigerant (liquid)
L>—<—J ~toneee Flectronic scale for
refrigerant charging