Test Run; Typical Unit Operation; Outdoor Unit Function Setting - Mitsubishi Electric Y Series Installation Manual

12. Test run

12.1. Typical unit operation

Items to be checked before a test run
• Measure the insulation resistance between the power supply terminal block and the ground with a 500 V ohmmeter, and check that it reads at least 1.0 MΩ.
- If the insulation resistance is 1.0 MΩ or below, turn on the main power to the unit and energize the compressor for at least 12 hours.
Warning:
• The compressor is energized when the main power to the unit is turned on. Make sure to turn off the power before disconnecting the compressor power
source cable from the terminal block to measure the insulation resistance.
• If the insulation resistance is 1.0 MΩ or below, do not operate the unit.
• Turn on the power at least 12 hours before performing a test run.
- Doing so will energize the compressor and evaporate the refrigerant in the compressor.
Caution:
• Insufficient energizing may result in compressor damage.
The events listed in the table below are normal occurrences and do not represent operation problems.
Events
Auto vane automatically switches air flow
direction.
Indoor unit remote controller displays "HO"
or "PLEASE WAIT" for about 5 minutes after
turning on the universal power supply.
Drain pump continues to operate even after
the unit has been turned off.
Immediately after startup, the indoor unit emits
the sound of the refrigerant flow.

12.2. Outdoor unit function setting

Function settings can be made by setting SW6 on the outdoor unit control board.
<SW6 setting item list>
Item Switch
SW6-1
SW6-2
SW6-3
SW6-4 High static pressure setting (unit model selection)
SW6-5 High static pressure setting (selection of 60 Pa or 30 Pa)
Setting
SW6-6
SW6-7
SW6-8 Selection of Low-noise or Demand
SW6-9
SW6-10 Selection of Diagnostic display or Function detail setting
*1 The DIPSW setting can be made before the unit is energized.
*2 The DIPSW setting can be made any time after the unit is energized.
Note:
• Unless otherwise specified, leave the switch to OFF where indicated by "-," which may be set to OFF for a reason.
Display on
remote controller
Normal display
The auto vane may switch over to horizontal air flow operation from vertical air flow operation
in cooling mode if the vertical air flow operation has been running for 1 hour. At defrost in
heating mode or immediately after heating start-up/shutdown, the auto vane automatically
switches to horizontal air flow for a short time.
"HO" or System is performing the initial operating sequence. Remote controller will be operable again
"PLEASE WAIT" after "HO" or "PLEASE WAIT" stops flashing and disappears.
flashes
No display After turning off the cooling operation, unit continues to operate the drain pump for 3 minutes,
then shuts it off.
Unit also continues to operate drain pump if condensate has been generated.
Normal display Unstable flow of the refrigerant emits a sound. This is temporary and does not imply a
problem.
Setting content
–
–
–
–
Low-noise mode selection
–
Cause
SW6 setting
OFF ON
–
–
–
Standard static pressure High static pressure
60 Pa 30 Pa
–
Performance priority Low-noise priority
Low-noise (Night) Demand
–
Diagnostic display Function detail setting
Switch setting timing
– –
– –
– –
Before being energized (*1)
Before being energized (*1)
– –
Any time after being energized (*2)
Before being energized (*1)
– –
Any time after being energized (*2)
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