Purging Procedures, Leak Test, And Test Run; Relocation And Maintenance - Mitsubishi Electric MSZ-GS18NA Installation Manual

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
Valve stem (inside) (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
Service port
A
Control valve
Open
Close Charge hose
Body
3) Evacuate the system to 4000 microns from both service valves. System manifold gaug-
es 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 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 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

5. RELOCATION AND MAINTENANCE

5-1. REMOVING AND INSTALLING THE PANEL
ASSEMBLY
Removal procedure (Fig. 1)
1) Open the front panel.
3) Close the front panel.
Installation procedure (Fig. 2)
1) Install the panel assembly following the removal procedure in reverse.
2) Be sure to press the positions as indicated by the arrows in order to attach the
assembly completely to the unit.
* Do not hold the A part when installing/removing or carrying the panel, or the panel
might be damaged.
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 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.
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 (only
MSZ series) operation. Test run will be performed for 30
minutes. If the power lamp blinks every 0.5 seconds, inspect
the indoor/outdoor unit connecting 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 instructions for de-
tails.
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 per-
formed, 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. EXPLANATION TO THE USER
• Using the OPERATING INSTRUCTIONS, explain to the user how to use the air condition-
from the remote controller holder, cleaning methods, precautions for operation, etc.)
• Recommend that the user read the OPERATING INSTRUCTIONS carefully.
1
3
4
2
2
2
4
Fig. 1
Fig. 2
A part : lower part of air
outlet of the panel
Emergency
operation switch
(E.O. SW)