Mitsubishi Electric MXZ-3A54VA Manual De Instrucciones página 7

5-4 PURGING PROCEDURES • LEAK TEST
• Perform the manifold valve work securely according to the installation manual of the manifold valve.
PURGING PROCEDURES
Connect the refrigerant pipes (both liquid pipe and gas pipe) between the indoor and
the outdoor unit.
Remove the service port cap of the stop valve on the gas pipe side of the outdoor unit.
(The stop valve will not work in it initial state fresh out of the factory [totally closed with
cap on].)
Connect the gauge manifold valve and the vacuum pump to the service port of the stop
valve on the gas pipe side of the outdoor unit.
Run the vacuum pump. (Vacuumize for more than 15 minutes.)
Check the vacuum with the gauge manifold valve, then close the gauge manifold valve
and stop the vacuum pump.
Leave it as is for one or two minutes. Make sure the pointer of the gauge manifold
valve remains in the same position. Confirm that the pressure gauge shows –0.101
MPa [Gauge] (–760 mmHg).
Charge hose (for R410A)
Remove the gauge manifold valve quickly from the service port of the stop valve.
After refrigerant pipes are connected and evacuated, fully open all stop valves on both
sides of gas pipe and liquid pipe.
Operating without fully opening lowers the performance and this causes trouble.
Pipe length up to 40 m
No gas charge is needed.
Tighten the cap to the service port to obtain the initial status.
Compound pressure
-0.101MPa
gauge (for R410A)
(-760 mmHg)
Pressure gauge
(for R410A)
Gauge manifold
valve (for R410A)
Handle
Handle High
Stop valve
Low
(gas side) Charge hose
(for R410A)
Vacuum
pump
(or the vacuum
Service port
Window pump with the
function to prevent
Adapter for
the back flow)
preventing
the back flow
Pipe length exceeding 40 m
Charge the prescribed
amount of gas. (refer to 5-1)
Retighten the cap.
Leak test
WARNING:
When installing or moving the unit, do not mix anything other than specified refrigerant (R410A) into
the refrigerating cycle.
If air is mixed, it may cause the refrigerating cycle to get abnormally high temperature, causing a risk of
burst.
Tightening torque
N·m
Cap for service port 13.7 to 17.7 140 to 180
Cap for stop valve 19.6 to 29.4 200 to 300
5-5 EARTHING WORK
Put the earth circuit to the ground in accordance with "Technical Standards for Electrical Installation".
CAUTION:
Do not connect the earth cable to any gas pipe, water pipe, lightening rod or telephone earth cable.
If there is some deficiency in earthing work, it may cause a risk of electric shock.
The product incorporates a frequency inverter and so requires earthing in order to observe electric charge and
noise caused by static electricity.
5-6 LOCKING THE OPERATION MODE OF THE AIR CONDITIONER (COOL,
DRY, HEAT)
• Description of the function:
With this function, you can lock the operation mode of the
outdoor unit. Once the operation mode is locked to either
COOL/DRY mode or HEAT mode, the air conditioner oper-
ates in that mode only.
* Initial setting is required to activate this function. Please ex-
plain 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 2nd Dip Switch 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 1st
Dip Switch 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.
7
kgf·cm
ON
ON ON
COOL/DRY HEAT