Purging Procedures, Leak Test, And Test Run; Relocation And Maintenance - Mitsubishi Electric MSZ-GS30NA2 Installation Manual

4. Purging Procedures, Leak Test, and Test Run

4. Purging Procedures, Leak Test, and Test Run
4-1. Purging Procedures and Leak Test 4-1. Purging Procedures and Leak Test
1) Remove service port caps from stop valves on both sides of refrigerant lines. (The stop 1) Remove service port caps from stop valves on both sides of refrigerant lines. (The stop
valves are fully closed when shipped.) Leave closed. valves are fully closed when shipped.) Leave closed.
2) Connect gauge manifold to ports of stop valves. 2) Connect gauge manifold to ports of stop valves.
3) Evacuate the system to 4000 microns from both service valves. System manifold gauges 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 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. 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 4) Evacuate the system to 1500 microns. Break the vacuum with Nitrogen(N2) into the
discharge service valve to 0 PSIG. discharge service valve to 0 PSIG.
5) Evacuate the system to 500 microns. 5) Evacuate the system to 500 microns.
6) Close gauge manifold valves, stop the pump, and conduct a 30 minute rise test. 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. 7) System should hold 500 microns for a minimum of 1 hour.
8) Fully open the valve stem of all stop valves on both sides of gas pipe and liquid pipe by the 8) Fully open the valve stem of all stop valves on both sides of gas pipe and liquid pipe by the
hexagonal wrench. If the valve stem hits the stopper, do not turn it any further. Operating hexagonal wrench. If the valve stem hits the stopper, do not turn it any further. Operating
without fully opening lowers the performance and this causes trouble. 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 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 sure to charge slowly with liquid refrigerant. Otherwise composition of the refrigerant in
the system may be changed and aff ect performance of the air conditioner. the system may be changed and aff ect performance of the air conditioner.
10) Remove gauge manifolds and replace service port caps and tighten. 10) Remove gauge manifolds and replace service port caps and tighten.
11) Leak test 11) Leak test
Stop valve cap Stop valve cap
Valve stem (inside) Valve stem (inside)
(Torque 15 to (Torque 15 to
22 ft-lb, 19.6 to 22 ft-lb, 19.6 to
Close Close
29.4 N•m, 200 29.4 N•m, 200
to 300 kgf▪cm) to 300 kgf▪cm)
Open Open
Hexagonal wrench Hexagonal wrench
Service port cap Service port cap
(Torque 10 to 13 ft (Torque 10 to 13 ft
-Ib, 13.7 to 17.7 N•m, -Ib, 13.7 to 17.7 N•m,
140 to 180 kgf•cm) 140 to 180 kgf•cm)
Precautions when using the control valve When attaching the control valve Precautions when using the control valve When attaching the control valve
Service port Service port
A A
Control valve Control valve
Open Open
Charge hose Charge hose
Close Close
Body Body

5. Relocation and Maintenance

5. Relocation and Maintenance
5-1. Removing and Installing the Panel Assembly 5-1. Removing and Installing the Panel Assembly
Removal procedure (Fig. 1, 2) Removal procedure (Fig. 1, 2)
1) Remove the three screws that attach the panel assembly. 1) Remove the three screws that attach the panel assembly.
2) Open the front panel. 2) Open the front panel.
3) Remove the two screws that attach the panel assembly. 3) Remove the two screws that attach the panel assembly.
4) Close the front panel. 4) Close the front panel.
5) Remove the panel assembly. Be sure to remove its bottom end fi rst. 5) Remove the panel assembly. Be sure to remove its bottom end fi rst.
Installation procedure (Fig. 3, 4) Installation procedure (Fig. 3, 4)
1) Point the horizontal vane slightly downward. 1) Point the horizontal vane slightly downward.
2) Attach the bottom of the panel assembly under the horizontal vane. 2) Attach the bottom of the panel assembly under the horizontal vane.
3) Fit in the top of the panel assembly. 3) Fit in the top of the panel assembly.
4) Fit in the bottom of the panel assembly and tighten it using screws. 4) Fit in the bottom of the panel assembly and tighten it using screws.
5) Push the section of the front panel marked by the arrows to close the front panel securely. 5) Push the section of the front panel marked by the arrows to close the front panel securely.
* Do not hold the A part when installing/removing or carrying the panel, or the panel might * Do not hold the A part when installing/removing or carrying the panel, or the panel might
be damaged. be damaged.
Compound pressure gauge Compound pressure gauge
–14.7 psi [Gauge] –14.7 psi [Gauge]
(for R410A) (for R410A)
(–0.101 Mpa) (–0.101 Mpa)
Pressure gauge Pressure gauge
(for R410A) (for R410A)
Stop valve for LIQUID Stop valve for LIQUID
Gauge manifold valve Gauge manifold valve
(for R410A) (for R410A)
Handle Handle
Low Low
Handle High Handle High
Charge hose Charge hose
Stop valve for Stop valve for
(for R410A) (for R410A)
GAS GAS
Adapter for Adapter for
preventing the preventing the
back fl ow back fl ow
Vacuum pump (or the vacuum Vacuum pump (or the vacuum
pump with the function to pump with the function to
prevent the back fl ow) prevent the back fl ow)
to the service port, valve core may to the service port, valve core may
deform or loosen if excess pressure deform or loosen if excess pressure
is applied. This may cause gas leak. is applied. This may cause gas leak.
When attaching the control valve to When attaching the control valve to
the service port, make sure that the the service port, make sure that the
valve core is in closed position, and valve core is in closed position, and
then tighten part A. Do not tighten then tighten part A. Do not tighten
part A or turn the body when valve part A or turn the body when valve
core is in open position. core is in open position.
4-2. Test Run 4-2. Test Run
1) Insert power supply plug into the power outlet and/or turn 1) Insert power supply plug into the power outlet and/or turn
on the breaker. on the breaker.
2) Pressing the E.O. SW will perform a test run for 30 minutes. 2) Pressing the E.O. SW will perform a test run for 30 minutes.
(For MSZ, pressing the switch once will perform COOL (For MSZ, pressing the switch once will perform COOL
operation and twice will perform HEAT operation.) If the operation and twice will perform HEAT operation.) If the
left lamp of the operation indicator light blinks every 0.5 left lamp of the operation indicator light blinks every 0.5
seconds, inspect the indoor/outdoor unit connecting wire seconds, inspect the indoor/outdoor unit connecting wire
(A) for mis-wiring. After the test run, emergency mode (75°F (A) for mis-wiring. After the test run, emergency mode (75°F
[24°C]) will start. [24°C]) will start.
3) To stop operation, press the E.O. SW several times until 3) To stop operation, press the E.O. SW several times until
all LED lamps turn off . Refer to operating instructions for all LED lamps turn off . Refer to operating instructions for
details. details.
Checking the remote (infrared) signal reception Checking the remote (infrared) signal reception
Press the OFF/ON button on the remote controller and listen for an audible indicator from Press the OFF/ON button on the remote controller and listen for an audible indicator from
the indoor unit. Press the OFF/ON button again to turn the air conditioner off . the indoor unit. Press the OFF/ON button again to turn the air conditioner off .
• Once the compressor stops, the restart preventive device operates so the compressor • Once the compressor stops, the restart preventive device operates so the compressor
will not operate for 3 minutes to protect the air conditioner. will not operate for 3 minutes to protect the air conditioner.
4-3. Auto Restart Function 4-3. Auto Restart Function
This product is equipped with an auto restart function. When the power supply is cut off 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 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 instruc- the previous setting once the power supply is resumed. (Refer to the operating instruc-
tions for details.) tions for details.)
Caution: Caution:
• After test run or remote signal reception check, turn off the unit with the E.O. SW or the • 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, 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. the unit will automatically begin operation when power supply is resumed.
To the user To the user
• After installing the unit, explain to the user about auto restart function. • 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- • 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. resentative to deactivate the function. Refer to the service manual for details.
4-4. Explanation to the User 4-4. Explanation to the User
• Using the OPERATING INSTRUCTIONS, explain to the user how to use the air conditioner • Using the OPERATING INSTRUCTIONS, explain to the user how to use the air conditioner
(the remote controller, removing the air fi lters, placing or removing the remote controller (the remote controller, removing the air fi lters, placing or removing the remote controller
from the remote controller holder, cleaning methods, precautions for operation, etc.) from the remote controller holder, cleaning methods, precautions for operation, etc.)
• Recommend that the user read the OPERATING INSTRUCTIONS carefully. • Recommend that the user read the OPERATING INSTRUCTIONS carefully.
Fig. 1 Fig. 1
Fig. 3 Fig. 3
A part : lower part of air A part : lower part of air
outlet of the panel outlet of the panel
Emergency operation switch Emergency operation switch
(E.O. SW) (E.O. SW)
Fig. 2 Fig. 2
Horizontal vane Horizontal vane
Fig. 4 Fig. 4