Mitsubishi Electric Mr. SLIM PEAD-SM71JA Manuel D'installation page 21

9. Test run
9.1. Before test run
 After completing installation and the wiring and piping of the indoor and
outdoor units, check for refrigerant leakage, looseness in the power supply
or control wiring, wrong polarity, and no disconnection of one phase in the
supply.
 Use a 500-volt megohmmeter to check that the resistance between the
power supply terminals and ground is at least 1.0 MΩ.
 Do not carry out this test on the control wiring (low voltage circuit)
terminals.
Warning:
Do not use the air conditioner if the insulation resistance is less than 1.0 MΩ.
Insulation resistance
After installation or after the power source to the unit has been cut for an extended
period, the insulation resistance will drop below 1 MΩ due to refrigerant
accumulating in the compressor. This is not a malfunction. Perform the following
procedures.
1. Remove the wires from the compressor and measure the insulation resistance of
the compressor.
2. If the insulation resistance is below 1 MΩ, the compressor is faulty or the
resistance dropped due the accumulation of refrigerant in the compressor.
9.2. Test run
9.2.1. Using wired remote controller
■ Make sure to read operation manual before test run. (Especially items to secure safety)
Step 1 Turn on the power.
• Remote controller: The system will go into startup mode, and the remote controller power lamp (green) and "PLEASE WAIT" will blink. While the lamp and message are
blinking, the remote controller cannot be operated. Wait until "PLEASE WAIT" is not displayed before operating the remote controller. After the power is turned on, "PLEASE
WAIT" will be displayed for approximately 2 minutes.
• Indoor controller board: LED 1 will be lit up, LED 2 will be lit up (if the address is 0) or off (if the address is not 0), and LED 3 will blink.
• Outdoor controller board: LED 1 (green) and LED 2 (red) will be lit up. (After the startup mode of the system finishes, LED 2 will be turned off.) If the outdoor controller board
uses a digital display, [- ] and [ -] will be displayed alternately every second.
If the operations do not function correctly after the procedures in step 2 and thereafter are performed, the following causes should be considered and eliminated if they are
found.
(The symptoms below occur during the test run mode. "Startup" in the table means the LED display written above.)
Symptoms in test run mode
Remote Controller Display
Remote controller displays "PLEASE WAIT", and
cannot be operated.
After power is turned on, "PLEASE WAIT" is
displayed for 3 minutes, then error code is
displayed.
No display appears even when remote controller
operation switch is turned on. (Operation lamp
does not light up.)
Display appears but soon disappears even when
remote controller is operated.
Step 2 Switch the remote controller to "Test run".
a Select "Test run" from the Service menu, and press the [SELECT] button. [Fig. 9-2-1] (P.10)
a Select "Test run" from the Test run menu, and press the [SELECT] button. [Fig. 9-2-2] (P.10)
a The test run operation starts, and the Test run operation screen is displayed.
Step 3 Perform the test run and check the airflow temperature.
a Press the [F1] button to change the operation mode. [Fig. 9-2-3] (P.10)
Cooling mode: Check that cool air blows from the unit.
Heating mode: Check that warm air blows from the unit.
Step 4 Confirm the operation of the outdoor unit fan.
The speed of the outdoor unit fan is controlled in order to control the performance of the unit. Depending on the ambient air, the fan will rotate at a slow speed and will keep
rotating at that speed unless the performance is insufficient. Therefore, the outdoor wind may cause the fan to stop rotating or to rotate in the opposite direction, but this is not
a problem.
Step 5 Stop the test run.
a Press the [ON/OFF] button to stop the test run. (The Test run menu will appear.)
Note: If an error is displayed on the remote controller, see the table below.
3. After connecting the wires to the compressor, the compressor will start to warm up
4. If the insulation resistance rises above 1 MΩ, the compressor is not faulty.
• The compressor will not operate unless the power supply phase connection
• Turn on the power at least 12 hours before starting operation.
- Starting operation immediately after turning on the main power switch can result in
OUTDOOR BOARD LED Display
< > indicates digital display.
After "startup" is displayed, only green lights up.
<00>
After "startup" is displayed, green(once) and
red(once) blink alternately. <F1>
After "startup" is displayed, green(once) and
red(twice) blink alternately. <F3, F5, F9>
After "startup" is displayed, green(twice) and
red(once) blink alternately. <EA. Eb>
After "startup" is displayed, only green lights up.
<00>
After "startup" is displayed, only green lights up.
<00>
after power is supplied. After supplying power for the times indicated below,
measure the insulation resistance again.
• The insulation resistance drops due to accumulation of refrigerant in the
compressor. The resistance will rise above 1 MΩ after the compressor is
warmed up for two to three hours.
(The time necessary to warm up the compressor varies according to
atmospheric conditions and refrigerant accumulation.)
• To operate the compressor with refrigerant accumulated in the compressor, the
compressor must be warmed up at least 12 hours to prevent breakdown.
Caution:
is correct.
severe damage to internal parts. Keep the power switch turned on during the
operational season.
• After power is turned on, "PLEASE WAIT" is displayed for 2
minutes during system startup. (Normal)
• Incorrect connection of outdoor terminal block. (R, S, T and S
S )
3
• Outdoor unit's protection devise connector is open.
• Incorrect wiring between the indoor and outdoor unit. (Polarity is
wrong for S , S , S )
1 2 3
• Remote controller transmission wire short.
• There is no outdoor unit of address 0. (Address is other than 0.)
• Remote controller transmission wire open.
• After canceling function selection, operation is not possible for
about 30 seconds. (Normal)
Cause
, S
1 2
21
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