Purging Procedures, Leak Test, And Test Run; Auto Restart Function - Mitsubishi Electric MSZ-GA24NA Installation Manual

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.
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 15 minutes or more.
4) Check the vacuum with the gauge manifold valve, then close it and shut off the vacuum
pump.
5) Leave as it is for one or two minutes. Make sure pointer gauge manifold valve remains
6) Quickly remove gauge manifold valve from service port of stop valve.
7) After refrigerant pipes are connected and evacuated, fully open all stop valves on both
sides of gas pipe and liquid pipe. Operating the unit without fully opening the valves
lowers the performance and causes problems.
8) Refer to 1-3. SPECIFICATIONS, 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.
10) Conduct a leak test
4-2. TEST RUN
1) Insert power supply plug into the power outlet and/or
turn on the breaker.
2) Press the E.O. SW once. Test run will be performed
for 30 minutes. If the left operation indicator light blinks
every 0.5 seconds, inspect the indoor/outdoor unit con-
necting wire (A). After the test run, emergency COOL
mode (75ºF [24ºC] COOL) will start.
3) To stop operation, press the E.O. SW several times
until all LED lamps turn off. Refer to operating instruc-
tions for details.
Checking the remote (infrared) signal reception
Press the ON/OFF button on the remote controller and listen for an audible indicator
from the indoor unit. Press the ON/OFF button again to turn the air conditioner off.
• Once the compressor stops, the restart preventive device operates so the compres-
sor will not operate for 3 minutes to protect the air conditioner.

4-3. AUTO RESTART FUNCTION

This product is equipped with an auto restart function. When the power supply is cut off
during operation, such as during blackouts, the function automatically starts opera-
tion in the previous setting once the power supply is resumed. (Refer to the operating
instructions for details.)
Caution:
• After test run or remote signal reception check, turn off the unit with the E.O. SW
or the remote controller before turning off the power supply. If this procedure is
not performed, the unit will automatically begin operation when power supply is
resumed.
To the user
• After installing the unit, explain to the user about auto restart function.
• If auto restart function is unnecessary, it can be deactivated. Consult the service
representative to deactivate the function. Refer to the service manual for details.
4-4. EXPLANATION TO THE USER
• Using the OPERATING INSTRUCTIONS, explain to the user how to use the air con-
controller from the remote controller holder, cleaning methods, precautions for opera-
tion, etc.)
• Recommend that the user read the OPERATING INSTRUCTIONS carefully.
*4 to 5 turns
Emergency operation switch
(E.O. SW)
Stop valve cap
(Torque 19.6 to
*Close
29.4 N•m, 200
Stop valve
*Open to 300 kgf•cm)
for LIQUID
Hexagonal wrench
Service port cap
(Torque 13.7 to
17.7 N•m, 140 to
180 kgf•cm)
Precautions when using the control valve When attaching the control valve
Service port
A
Control valve
Open
Charge hose
Close
Body
Compound pressure gauge
(for R410A)
Pressure gauge
(for R410A)
Gauge manifold valve
(for R410A)
Handle
Low
Handle High
Charge hose
Stop valve for
(for R410A)
GAS
Adapter for pre-
venting the back
Vacuum pump (or the vacuum
pump with the function to
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.