Mitsubishi MXZ-4E80VAD, Installation Manual

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En-6
4-1. PURGING PROCEDURES AND LEAK TEST
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.
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. 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
Stop valve
for GAS
Gauge mani
-
fold valve (for
R410A)
Compound pressure
gauge (for R410A)
–0.101MPa
(–760 mmHg)
Handle
Low
Handle High
Vacuum pump
(for R410A)
Charge hose
(for R410A)
*Close
*Open
Hexagonal
wrench
*4 to 5 turns
Stop valve
for LIQUID
Pressure gauge
(for R410A)
Precautions when us
-
ing 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.
Service port
Charge hose
(for R410A)
Body Close
Open
Control valve
A
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.
Union
Stop valve
Liquid
pipe
Indoor
unit
Stop valve with
service port
Gas
pipe
Refrigerant gas
cylinder
operating valve
(for R410A)
Gauge manifold
valve (for R410A)
Charge hose
(for R410A)
Refrigerant gas cylinder for R410A with siphon
Electronic scale for refrigerant charging
Refrigerant (liquid)
Outdoor
unit
Union
Union
Union
4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN
Service port cap
(Torque 13.7 to
17.7 N•m, 140 to
180 kgf•
cm
)
Stop valve cap
(Torque 19.6 to
29.4 N•m, 200
to 300 kgf•cm)
Model
Indoor unit
MXZ-5E100VAD
A
–
E
MXZ-4E80VAD
A – D
4-3. LOCKING THE OPERATION MODE OF THE AIR CONDITIONER (COOL, DRY, HEAT)
COOL/DRY HEAT
• Description of the function:
With this function, once the operation mode is locked to either COOL/DRY mode
or HEAT mode, the air conditioner operates in that mode only.
* Changing the setting is required to activate this function. Please explain about
this function to your customers and ask them whether they want to use it.
[How to lock the operation mode]
1) Be sure to turn off the main power for the air conditioner before making the
setting.
2) Set the “3” of SW1 on the outdoor controller board to ON to enable this function.
3) To lock the operation mode in COOL/DRY mode, set the “4” of SW1 on the
outdoor controller board to OFF. To lock the operation in HEAT mode, set the
same switch to ON.
4) Turn on the main power for the air conditioner.
SW1
ON
1 2 3 4 5 6
SW1
ON
1 2 3 4 5 6
LED
SW1
SW871
SW2
WG79A696H02_en.indd 6 2016/04/21 14:46:40