Mitsubishi Electric CITY MULTI PURY-HP-TNU-A1 Manuel D'installation page 42

11. Test run
11-1. Before a test run
After the wiring work has been completed, measure the insulation resistance, and make sure that it reads at least 1 MΩ.
- Failure to do so may result in electric leakage, malfunction, or fire.
Turn on the power at least 12 hours before starting operation. Keep the power turned on throughout the
operating season.
- Insufficient energizing will result in malfunction.
・Before performing a test run, turn off the power to the outdoor unit, and disconnect the power cable from the power supply terminal block to
measure the insulation resistance.
・Measure the insulation resistance between the power supply terminal block and the earth with a 500 V ohmmeter, and make sure it is at least 1 MΩ.
・If the insulation resistance is 1 MΩ or above, connect the power cable to the power supply terminal, and turn on the power at least 12 hours
before starting operation. If the insulation resistance is below 1 MΩ, do not operate the unit, and check the compressor for a earth fault.
・While the unit is turned on, the compressor will remain energized even when it is stopped.
・The insulation resistance between the power supply terminal block and the earth may drop to near 1 MΩ immediately after installation or when
the main power to the unit has been turned off for a long time because of the stagnation of refrigerant in the compressor.
・By turning on the main power and energizing the unit for 12 hours or longer, the refrigerant in the compressor will evaporate and the insulation
resistance will rise.
・Do not apply an ohmmeter voltage to the terminal block for transmission cables. Doing so will damage the control board.
・Do not measure the insulation resistance of the transmission terminal block of the unit remote controller.
・Check for refrigerant leakage and for loose power cables and transmission cables.
・Check that the high-pressure side and low-pressure side service valves are fully open. Tighten the valve caps.
・Check the phase order of the power supply and the interphase voltage. If the voltage is out of the ±10% range, or if the voltage imbalance is more
than 2%, discuss the countermeasure with the customer.
・When a transmission booster unit is connected, turn on the transmission booster unit before turning on the outdoor unit. If the outdoor unit is
turned on first, the refrigerant circuit connection information will not be properly verified. If the outdoor unit is turned on first, turn on the
transmission booster unit and then power reset the outdoor unit.
・When a power supply unit is connected to the centralized control transmission cable, or when power is supplied from a system controller with a
power-supply function, perform a test run with the power supply unit being energized. Leave the power jumper connected to CN41.
・When power is turned on or after power recovery, performance may degrade for approximately 30 minutes.
11-2. Function setting
Make function settings by setting the dipswitches SW4, SW6, and SWP3 on the main board.
Write down the switch settings on the electrical wiring diagram label on the control box front panel for future reference when the control box needs
to be replaced.
・Take the following steps to make temperature unit (ºC or ºF) settings.
① Set the 10th bit of SW6 to ON.
② Set SW4 as shown in the table below to select the setting item No.921. (The setting item No. will be displayed on LED1.)
③ Press SWP3 for two seconds or longer to change the settings. (The settings can be checked on LED3.)
Setting item No.
Temperature unit
921
setting
*1 Make the SW4 setting after the unit is energized.
*2 This will blink while the system is starting up.
・Make various function settings by setting SW5 and SW6, referring to the table below.
Setting content
SW5-1 Centralized control switch
SW5-2 Deletion of connection information
SW5-3
SW5-4
SW5-5
SW5-6
SW5-7
SW5-8
WT10508X02
SW4 0: OFF, 1: ON *
1 2 3 4 5 6
1 0 0 1 1 0
Without connection to the
centralized controller
Normal control
–
–
–
–
–
–
1
7 8 9 10
0 1 1 1
Setting
OFF ON
With connection to the centralized
controller
Deletion
Preset before shipment
GB-40
Setting (LED3 display) *
2
Unlit
ºC
Switch setting timing
Before being energized
Before being energized
–
–
–
–
–
–
Lit
ºF