Test Run; Typical Unit Operation; Outdoor Unit Function Setting - Mitsubishi Electric City Multi PUHY-P72TKMU-A 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
A specific indoor unit is not performing the
cooling or heating operation.
Auto vane automatically switches air flow
direction.
Fan speed automatically changes during
heating operation.
Fan stops during heating operation.
Fan does not stop even if unit is not operating.
At initial start in heating operation, fan cannot
be manually set.
Indoor unit remote controller displays "H0"
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.
Indoor unit emits noise when switching from
heating to cooling and vice versa.
Immediately after startup, the indoor unit emits
the sound of the refrigerant flow.
Warm air is omitted from an indoor unit that is
not performing the heating operation.

12.2. Outdoor unit function setting

Function settings can be made by setting SW4, SW6, and SWP01 on the outdoor unit control board.
• To make function settings, set the 10th bit of SW6 to ON, and then set SW4. To change the setting, press SWP01 for two seconds or longer. The switch settings can
be checked on LED3. (The item No. will be displayed on LED1.)
Write down the switch settings on the electrical wiring diagram label on the control box panel for future reference when the control board needs to be replaced.
<SW4 setting item list>
Setting item No.
Item Setting content
(*2)
921 LED1 display
Setting
933 Snow sensor setting
(*1)
934 Snow sensor setting
*1 Check on LED3 that the switches are set correctly.
*2 Change the setting item No. when the 10th bit of SW6 is set to ON.
*3 This will blink while the system is starting up.
*4 After setting the setting item No., press SWP01 for two seconds or longer.
<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 Low-noise mode selection
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:
• Do not change the factory settings of SW5-3 through SW5-8.
• Unless otherwise specified, leave the switch to OFF where indicated by "-," which may be set to OFF for a reason.
Display on
remote controller
"Cooling" Because other indoor unit in the same refrigerant system is performing the heating or cooling
or "heating" operation, the cooling or heating operation for the indoor unit in question is not operating.
flashes
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.
Normal display Unit fan operates in ultra-low speed when thermostat is turned off; automatically changes
over to set value via timer or refrigerant temperature when thermostat is turned off.
Defrost display Fan does not operate when unit is in defrost mode.
No display When in heating mode, fan still runs for 1 minute after unit stops to exhaust any residual heat.
Heat ready Fan automatically runs in ultra-low speed for 5 minutes after system is turned on, or until
refrigerant temperatures rises to 35°C [95°F], and runs in low-speed operation for 2 minutes
thereafter until set temperature is reached.
"H0" or System is performing the initial operating sequence. Remote controller will be operable again
"PLEASE WAIT" after "H0" 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 This is a normal sound of the refrigerant circuit operating properly.
Normal display Unstable flow of the refrigerant emits a sound. This is temporary and does not imply a
problem.
Normal display The LEV is slightly open for preventing any refrigerant, inside of the indoor unit that is not
performing the heating operation, from being liquefied. This does not imply a problem.
Setting (LED3 display (*3))
OFF (unlit)
Celsius
No. 934 ineffective
Continuous fan operation Intermittent fan operation 0
Setting content
–
–
–
Standard static pressure
–
Performance priority
Low-noise (Night)
–
Diagnostic display
Cause
SW4 0: OFF, 1: ON
ON (lit) 1 2 3 4 5 6
Fahrenheit 1 0 0 1 1 0
No. 934 effective 1 0 1 0 0 1
1 1 0 0 1
SW6 setting
OFF ON
– –
– –
– –
High static pressure
60 Pa 30 Pa
– –
Low-noise priority Any time after being energized (*2)
Demand
– –
Function detail setting Any time after being energized (*2)
SWP01
7 8 9 10
0 1 1 1 (*4)
0 1 1 1 (*4)
0 1 1 1 (*4)
Switch setting timing
–
–
–
Before being energized (*1)
Before being energized (*1)
–
Before being energized (*1)
–
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