Purging Procedures, Leak Test, And Test Run - Mitsubishi Electric MSY-A24NA Installation Manual

3-3. PIPE CONNECTION
* Fasten flare nut with a torque wrench as specified in the table.
* When fastened too tight, flare nut may brake after a long period and cause refrigerant
leakage.
Indoor unit connection
Connect both liquid and gas pipings to indoor unit.
* Apply a thin coat of refrigeration oil (J) on the seat surface of pipe.
* For connection, first align the center, then tighten the first 3 to 4 turns of flare nut.
* Use tightening torque table below as a guideline for indoor unit side union joint section,
and tighten using two wrenches. Excessive tightening damages the flare section.
Outdoor unit connection
Connect pipes to stop valve pipe joint of the outdoor unit in the same manner applied for
indoor unit.
* For tightening, use a torque wrench or spanner and use the same tightening torque ap-
plied for indoor unit.
3-4. INSULATION AND TAPING
1) Cover piping joints with pipe cover.
2) For outdoor unit side, surely insulate every piping including valves.
3) Using piping tape (G), apply taping starting from the entry of outdoor unit.
* Stop the end of piping tape (G) with tape (with adhesive agent attached).
* When piping have to be arranged through above ceiling, closet or where the temper-
ature and humidity are high, wind additional commercially sold insulation to prevent
condensation.
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. (The
stop valve will not work in its initial state fresh out of the factory, totally closed with cap
on.)
2) Connect gauge manifold valve and vacuum pump to service port of stop valve on the
gas pipe side of the outdoor unit.
0.101 MPa Compound pressure gauge
"4 to 5 tums
Stop valve cap
(-30 in.Hg
(for R410A)
(Torque 19.6 to
[-760 mHg])
Pressure gauge
*Close
*Open '|
Ss
Hexagonal wrench
29.4 Nem, 200
to 300 kafricm) St valve
for QUID
# (for R410A)
Gauge manifold valve
(for R410A)
Handle High
te= Charge hose
(for R410A)
Service port cap
(Torque 13.7 to
pump with the function to
prevent the back flow)
When attaching the control valve
to. the service port, valve core may
deform or loosen if excess pressure
is applied. This may cause gas leak.
[Precautions when using the control valve}
t g When attaching the control valve to
/ Service port the service port, make sure that the
Control wave a valve core is in closed position, and
then tighten part A. Do not tighten
Open ch Charge hose part A or turn the body when valve
ose Body 9 core is in open position.
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. Test run will be performed for 30
minutes. If the left side lamp of the operation indicator
blinks every 0.5 seconds, inspect the indoor/outdoor unit
corinecting wire (A) for mis-wiring. After the test run,
emergency COOL mode (75°F [24°C] COOL) will start.
3) To stop operation, press the E.O. SW several times until
all LED lamps turn off. Refer to operating instructions for
details.
Emergency operation switch
(E.0. SW)
Checking the remote (infrared) signal reception
Press the ON/OFF button on the remote controller and check that an electronic sound is
heard 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 compressor
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 stopped
during operation, such as during blackouts, the function automatically starts operation 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, tum off the unit with the E.O. SW or
the remote controller before turning off the power supply. Not doing so will cause the
unit to start operation automatically when power supply is resumed.
To the user
* After installing the unit, make sure to explain the user about auto restart function.
+ f auto restart function is unnecessary, it can be deactivated. Consult the service rep-
resentative to deactivate the function. Refer to the service manual for details.
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 pointer gauge manifold valve remains
in the same position. Confirm that pressure gauge shows ~0.101 Mpa [Gauge] (~30
in.Hg [~760 mmHgJ).
6) Remove gauge manifold valve quickly 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 without fully opening lowers the perform-
ance and this causes trouble.
8) Refer to 1-3., 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
4-4, EXPLANATION TO THE USER
* Using the OPERATING INSTRUCTIONS, explain to the user how to use the air condi-
tioner (how to use the remote controller, how to remove the air filters, how to remove or
put the remote controller in the remote controller holder, how to clean, precautions for
operation, etc.)
* Recommend the user to read the OPERATING INSTRUCTIONS carefully.