Mitsubishi Electric MSZ-FS18NA Manuel D'installation page 7

3-3. PIPE CONNECTION
• Be sure to wrap insulation around the piping. Direct contact with the bare piping may result
in burns or frostbite.
Indoor unit connection
Connect both liquid and gas pipings to indoor unit.
frigeration oil on screw threads. Excessive tightening torque will result in damage on the
screw.
• Use tightening torque table above as a guideline for indoor unit side joints, and tighten
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.
When installing the unit, securely connect the refrigerant pipes before starting
the compressor.
3-4. INSULATION AND TAPING
1) 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
4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN
4-1. PURGING PROCEDURES AND LEAK TEST
1) Remove service port caps from stop valves on both sides of refrigerant lines. (The stop
valves are fully closed when shipped.) Leave closed.
2) Connect gauge manifold to ports of stop valves.
Stop valve cap
*4 to 5 turns
(Torque 15 to
22 ft-lb, 19.6 to
*Close
29.4 N•m, 200
*Open
Hexagonal wrench
Service port cap
(Torque 10 to 13 ft
-Ib, 13.7 to 17.7 N•m,
140 to 180 kgf•cm)
Precautions when using the control valve When attaching the control valve to
Service port
A
Control valve
Open
Charge hose
Close
Body
3) Evacuate the system to 4000 microns from both service valves. System manifold gauges
must not be used to measure vacuum. A micron gauge must be used at all times. Break
the vacuum with Nitrogen(N2) into the discharge service valve to 0 PSIG.
4) Evacuate the system to 1500 microns. Break the vacuum with Nitrogen(N2) into the
discharge service valve to 0 PSIG.
5) Evacuate the system to 500 microns.
6) Close gauge manifold valves, stop the pump, and conduct a 30 minute rise test.
7) System should hold 500 microns for a minimum of 1 hour.
8) 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.
9) Refer to 1-3 and charge the prescribed amount of additional 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.
10) Remove gauge manifolds and replace service port caps and tighten.
11) 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 for COOL, and twice for HEAT operation.
Test run will be performed for 30 minutes. If the left lamp of the
operation indicator blinks every 0.5 seconds, inspect the indoor/
outdoor unit connecting wire (A) for mis-wiring. After the test run,
emergency mode (set temperature 75°F [24°C]) 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.
WARNING
Compound pressure gauge
–14.7 psi [Gauge]
(for R410A)
(–0.101 Mpa)
Pressure gauge
(for R410A)
Stop valve for LIQUID
Gauge manifold valve
(for R410A)
Handle
Low
Handle High
Charge hose
Stop valve for
(for R410A)
GAS
Adapter for
preventing the
Vacuum pump (or the vacuum
pump with the function to
the service port, valve core may de-
form 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.
-
Checking the remote (infrared) signal reception
Press the ON/OFF button on the remote controller (3) 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 rep-
resentative to deactivate the function. Refer to the service manual for details.
4-4. SETTING THE INSTALLATION POSITION
Be sure to set the remote controller in accordance with the installed position of the indoor
unit.
Installation position:
Left: Distance to objects (wall, cabinet, etc.) is less
than 19-11/16 in. (50 cm) to the left
Center: Distance to objects (wall, cabinet, etc.) is
more than 19-11/16 in. (50 cm) to the left and right
Right: Distance to objects (wall, cabinet, etc.) is less
than 19-11/16 in. (50 cm) to the right
Note:
The installation position can be set only when all the following conditions are met:
• The remote controller is powered off.
• Weekly timer is not set.
• Weekly timer is not being edited.
1) Hold down on the remote controller for 2 seconds to enter the position setting mode.
2) Select the target installation position by pressing
3) Press to complete the position setting.
Installation position
Remote controller
display
4-5. EXPLANATION TO THE USER
• Using the OPERATING INSTRUCTIONS, explain to the user how to use the air conditioner
the remote controller holder, cleaning methods, precautions for operation, etc.)
• Recommend that the user read the OPERATING INSTRUCTIONS carefully.
Emergency
operation
switch
(E.O. SW)
(Left) (Center)(Right)
. (Each press of the
Left Center
displays
Right