Mitsubishi Electric Mr.Slim MXZ-2A20NA, Руководство по установке

Страница: 7 / 20

7
5-5 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] (–30 in. Hg).
Pipe length up to 40 m (131 ft.)
No gas charge is needed. Pipe length exceeding 40 m (131 ft.)
Charge the prescribed amount of
gas. (refer to 5-1)
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.
Tighten the cap to the service port to obtain the initial status.
Retighten the cap.
Leak test
(or the vacuum
pump with the
function to prevent
the back flow)
Gauge manifold
valve (for R410A)
Pressure gauge
(for R410A)
Compound pressure
gauge (for R410A)
-0.101MPa
(-30 in. Hg)
Handle
Low
Handle High
Window
Charge hose (for R410A)
Vacuum
pump
Adapter for
preventing
the back flow
Charge hose
(for R410A)
Stop valve
(gas side)
Service port
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 ft·lb
Cap for service port 13.7 to 17.7 10 to 13
Cap for stop valve 19.6 to 29.4 15 to 22
5-6 GROUNDING 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.