Auto Restart Function - Mitsubishi Electric MSZ-FE18NA Installation Manual

3=3. PIPE CONNECTION
• Fasten flare nut with a torque wrench as specified in the table above.
• When fastened too tight, flare nut may eventually break and cause refrigerant leakage.
indoor unit connection
Connect both liquid and gas piping to indoor unit.
• Apply a thin coat of refrigerant oil (J) on the seat surface of pipe.
• To connect, first align the center, then tighten the first 3 to 4 turns of flare nut.
• Use tightening torque table in (3-2.) as a guideline for indoor unit side joints, 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 following the same procedure
detailed in Indoor unit connection.
• For tightening, use a torque wrench or spanner.
3-4. INSULATION AND TAPING
t) Cover piping joints with pipe cover.
2) For outdoor unit side, insulate the piping, including valves.
3) Apply piping tape (G) starting from the connection on the outdoor unit.
• When piping has to be installed through a ceiling, closet or where the temperature and
humidity are high, use additional field-supplied insulation to prevent condensation.
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 valves are fully closed and covered in caps in 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 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
in the same position. Confirm that pressure gauge shows 0.101 MPa [Gauge] ( 30
in.Hg [-760 mmHg]).
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 t-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 to 5 turns
*Close
*Open _-*
Hexagonal wrench
Stop valve cap 0.101 MPa Compound pressure gauge
(Torque 19.6 to (-30 in.Hg (for R410A)
29.4 N,m. 15 to [ 760 mmHg]) Pressure gauge
22 Ibfoft [200 to Stop valve €' (for R410A)
300 kgf-cm]) for LIQUID
Gauge manifold valve
Handle (for R410A)
Low
Stop valve for
Service port cap
(Torque 13.7 to Adapter for pre-
17.7 N,m, 10 to 13 venting the back
Ibf,ft [140 to 180 flow
kgf,cm])
Handle High
e hose
(for R410A)
Vacuum pump (or the vacuum
pump with the function to
prevent the back flow)
-Precautions when usin the control valve] When attachinq the control valve
to the service port, valve core may
seClose \ g
Body
deform or loosen if excess pressure
is applied. This may cause qas 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.
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 connecting wire
(A). 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 de-
tails. \ Emergency
operation switch
(E.O. SW)
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 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 cut off
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, 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
conditioner (the remote controller, removing the air filters, placing or removing the re-
mote controller from the remote controller holder, cleaning methods, precautions for
operation, etc.)
• Recommend that the user read the OPERATING INSTRUCTIONS carefully.