HEAD OFFICE: MITSUBISHI DENKI BLDG., 2-2-3, MARUNOUCHI, CHIYODA-KU,
TOKYO 100-8310, JAPAN
4
Release the hooks.
EMERGENCY
OPERATION switch
Mode
Operation Indicator lamp
1
COOL
(Light)
(Off)
2
STOP
(Off)
(Off)
EMERGENCY
OPERATION switch
Mode
Operation Indicator lamp
1
COOL
(Light)
(Off)
2
HEAT
(Off)
(Light)
3
STOP
(Off)
(Off)
Push
Go down
Indoor
unit
Union
Liquid pipe
Gas pipe
Stop valve
Outdoor
unit
Refrigerant gas cylinder
operating valve
Charge hose
Service port
Note: If the charge
hose is connected
to the service port,
be sure to remove
the GUARD before
servicing.
Refrigerant gas cylinder
SCALE
7. FOR MOVEMENT AND MAINTENANCE
7-1 REMOVING AND REINSTALLING THE FRONT PANEL
FRONT PANEL REMOVAL
FRONT PANEL REINSTALLATION
Note:
Do not open the front panel up beyond the level position.
The panel may come off in order to prevent it from being damaged.
1
Set the horizontal vane to the position as below before reinstalling the front
panel.
2
Attach the bottom of the front panel under the horizontal vane.
3
Fit in the top of the front panel.
4
Fit in the bottom of the front panel and tighten it using screws.
5
Push the section of the front panel marked by the arrow and fit the panel into the
air conditioner.
7-2 REMOVING THE INDOOR UNIT
Remove the bottom of the indoor unit from the installation plate.
1
Remove the front panel. (See FRONT PANEL REMOVAL shown above.)
2
Insert flat screwdrivers into the square holes at the left and right bottom of the
indoor unit and push them up; the bottom of the indoor unit goes down and the
hooks are released.
7-3 GAS CHARGE
1
Connect gas cylinder to the service port of stop valve (3-way).
2
Perform air purge of the pipe (or hose) coming from refrigerant gas cylinder.
3
Replenish specified amount of the refrigerant, while operating the air conditioner
for cooling.
CAUTION
Never charge liquid refrigerant, such as by inverting the gas cylinder while
charging, otherwise troubles may be generated.
To maintain the high pressure of the gas cylinder, warm the gas cylinder with warm
water (under 104
°
F) during cold season. But never use naked fire or steam.
Square hole
5
Push
Horizontal vane
3
2 4
1
Point the
horizontal
vane slightly
downward.
(R22) Gas charge
1
Remove the screw caps.
2
Remove three screws.
3
Pull the bottom.
Hold this concave section and pull the bottom
forward to remove the front panel.
6-4 TEST RUN
MS type
•
Before performing the test run, recheck any wrong wiring.
Wrong wiring prevents normal operation or results in blown fuse disabling
operation.
•
The test run can be started by pressing EMERGENCY OPERATION switch. When
the EMERGENCY OPERATION switch is once pressed, the unit will start the test
run (continuous operation) for 30 minutes.
A thermostat does not work during this time. After 30 minutes the unit will start the
EMERGENCY OPERATION at a fixed temperature setting of 75
°
F in COOL MODE.
•
Perform test run in the following procedure.
PROCEDURE
•
Press the EMERGENCY OPERATION switch.
1
Press it once, and after test run for 30 minutes the EMERGENCY COOL MODE starts.
If the left side lamp of the operation indicator blinks every 0.5 seconds, inspect
the indoor/outdoor connecting wire
A
for mis-wiring.
2
Press it once more, and the operation stops.
(The operation mode alternates between
1
and
2
every time the EMERGENCY
OPERATION switch is pressed.)
MSH type
•
Before performing the test run, recheck any wrong wiring.
Wrong wiring prevents normal operation or results in blown fuse disabling operation.
•
The test run can be started by pressing EMERGENCY OPERATION switch. When
the EMERGENCY OPERATION switch is once pressed, the unit will start the test
run (continuous operation) for 30 minutes.
A thermostat does not work during this time. After 30 minutes the unit will start the
EMERGENCY OPERATION at a fixed temperature setting of 75
°
F in COOL MODE
or HEAT MODE.
•
Perform test run in the following procedure.
PROCEDURE
•
Press the EMERGENCY OPERATION switch.
1
Press it once, and after test run for 30 minutes the EMERGENCY COOL MODE starts.
If the left side lamp of the operation indicator blinks every 0.5 seconds, inspect
the indoor/outdoor connecting wire
A
for mis-wiring.
2
Press it once more, and the EMERGENCY HEAT MODE starts.
3
Press it once more, and the operation stops.
(The operation mode changes in order of
1
~
3
every time the EMERGENCY
OPERATION switch is pressed.)
•
In starting the heating operation, indoor unit fan may not operate to prevent blowing
cool air. Please wait for a few minutes until the temperature of heat exchanger rises
and warm air blows out.
MS type and MSH type
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 condi-
tioner off.
If the indoor unit is operated with the remote controller, both the
test run and the emergency operation are released by commands
from the remote controller.
•
Once the compressor stops, the restart preventive device operates so the compres-
sor will not operate for three minutes to protect the air conditioner.
6-5 EXPLANATION TO THE CUSTOMER
•
Using the OPERATING INSTRUCTIONS, explain the following to the customer, how
to control temperature, how to remove the air filters, how to remove or put the re-
mote controller in the remote controller holder, how to clean, precautions for opera-
tion, etc.
•
Recommend the customer to read the OPERATING INSTRUCTIONS carefully.
1
2
3
1
Remove the fixing
screw.
2
Move the corner
box to right and
pull it downward.
3
Release the
bottom part of the
unit downward and
pull it forward.
