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12. Test run
12.1. Typical unit operation
Items to be checked before a test run
-
Warning:
source cable from the terminal block to measure the insulation resistance.
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:
The events listed in the table below are normal occurrences and do not represent operation problems.
Events
cooling or heating operation.
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 "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.
Indoor unit emits noise when switching from
heating to cooling and vice versa.
Immediately after startup, the indoor unit emits
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
(*2)
921
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
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.
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.
Normal display
heating mode or immediately after heating start-up/shutdown, the auto vane automatically
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.
"HO" or
System is performing the initial operating sequence. Remote controller will be operable again
"PLEASE WAIT"
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
problem.
Normal display
The LEV is slightly open for preventing any refrigerant, inside of the indoor unit that is not
Setting (LED3 display (*3))
Setting content
OFF (unlit)
LED1 display
Celsius
No. 934 ineffective
Continuous fan operation Intermittent fan operation
Setting content
–
–
–
–
Low-noise mode selection
–
Cause
ON (lit)
1
2
Fahrenheit
1
0
No. 934 effective
1
0
0
1
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
SW4 0: OFF, 1: ON
SWP01
3
4
5
6
7
8
9 10
0
1
1
0
0
1
1
1 (*4)
1
0
0
1
0
1
1
1 (*4)
1
0
0
1
0
1
1
1 (*4)
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)
25
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