Mitsubishi Electric Mr.SLIM SEZ-M25DA, Installation Manual

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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. Test run
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
Cause
Remote Controller Display
OUTDOOR BOARD LED Display
< > indicates digital display.
Remote controller displays “PLEASE WAIT”,
and cannot be operated.
After “startup” is displayed, only green lights
up. <00>
• After power is turned on, “PLEASE WAIT” is displayed for
2 minutes during system startup. (Normal)
After power is turned on, “PLEASE WAIT” is
displayed for 3 minutes, then error code is
displayed.
After “startup” is displayed, green(once) and
red(once) blink alternately. <F1>
• Incorrect connection of outdoor terminal block (R, S, T and S
1
,
S
2
, S
3
.)
After “startup” is displayed, green(once) and
red(twice) blink alternately. <F3, F5, F9>
• Outdoor unit’s protection devise connector is open.
No display appears even when remote
controller operation switch is turned on.
(Operation lamp does not light up.)
After “startup” is displayed, green(twice) and
red(once) blink alternately. <EA. Eb>
• Incorrect wiring between the indoor and outdoor unit (Polarity
is wrong for S
1
, S
2
, S
3
.)
• Remote controller transmission wire short.
After “startup” is displayed, only green lights
up. <00>
• There is no outdoor unit of address 0. (Address is other than
0.)
• Remote controller transmission wire open.
Display appears but soon disappears even
when remote controller is operated.
After “startup” is displayed, only green lights
up. <00>
• After canceling function selection, operation is not possible for
about 30 seconds. (Normal)
8. Electrical work
Function table 1
Select unit number 00
Mode Settings
Mode no. Setting no. Initial setting Check
Power failure automatic recovery
(AUTO RESTART FUNCTION)
Not available
01
1 *2
Available *1 2 *2
Indoor temperature detecting Indoor unit operating average
02
1
Set by indoor unit’s remote controller 2
Remote controller’s internal sensor 3
LOSSNAY connectivity Not Supported
03
1
Supported (indoor unit is not equipped with outdoor-air intake) 2
Supported (indoor unit is equipped with outdoor-air intake) 3
Function table 2
Select unit numbers 01 to 04 or all units (AL [wired remote controller]/07 [wireless remote controller])
Mode Settings Mode no. Setting no. Initial setting Check
Filter sign 100 Hr
07
1
2500 Hr 2
No filter sign indicator 3
External static pressure 15 Pa
08
1
35 Pa 2
50 Pa 3
The same as setting of mode no.08
10
1
5 Pa (set mode no. 08 to 1) 2
*1 When the power supply returns, the air conditioner will start 3 minutes later.
*2 Power failure automatic recovery initial setting depends on the connecting outdoor unit.
Note: When the function of an indoor unit were changed by function selection after the end of installation, always indicate the contents by entering a or other mark in the
appropriate check filed of the tables.
3. After connecting the wires to the compressor, the compressor will start to warm
up 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.
4. If the insulation resistance rises above 1 MΩ, the compressor is not faulty.
Caution:
• The compressor will not operate unless the power supply phase connection
is correct.
• Turn on the power at least 12 hours before starting operation.
- Starting operation immediately after turning on the main power switch can result
in severe damage to internal parts. Keep the power switch turned on during the
operational season.