SM-18006
3-117
TROUBLESHOOTING
3.4 Test Run
Check Item Contents
1 Damage Are the unit appearance and inside of the unit damaged?
2 Cooling Fan Is the fan installed in the correct position?
3 Fasteners
Are the screws loose due to vibration during transportation?
Check that the fasteners are secured rmly during installation, especially for electrical
wiring.
4 Refrigerant Leaks
Check that there are NO refrigerant leaks.
Flare connections may have become loose because of vibration during transportation.
5 DSW Setting Check that the DSW setting is the same as the factory setting. (Refer to Section 3.1.3.)
6 Insulation
1
Measure resistance between electrical component terminal and ground with a tester.
It is normal if the resistance is 1M
W
and over.
If 1M
W
or less, do not perform the operation due to insulation failure of electrical parts.
Do NOT apply power to the unit. (Control PCB may be damaged.)
7 Stop Valve Fully Open Prior to test run, check that the water source unit stop valve are completely open.
8 Power Supply Phase The operation is NOT possible with the incorrect or missing power phase order or
lacking phase.
• Alarm “03” or “05” is displayed on the LCD of the wired controller.
• Alarm “03” or “05” is displayed on the 7-segment display of the water source unit.
Check the power supply phase according to the caution label attached close to the
water source unit terminal block or inside of the service cover.
9 Turn ON Crankcase
Heater
2
After completion of item checks 1 to 8, turn ON the power supply of the water source
unit. Apply power to the water source unit(s) at least 12 hours prior to operation of the
system for preheating of the compressor oil..
10 Indoor and Entering
Water Temperature
<For Use in both Cooling and Heating Operation>
Are indoor and entering water temperature out of the working range
3
?
(Heating operation may not be possible due to the activation of the overload operation
prevention under the ambient temperature of 66
o
F (19
o
C) or over.)
To perform the test run, set the test run mode with the wired controller.
1: Insulation Resistance
l
If the unit has been turned OFF for long periods, insulation resistance may decrease to 1M
W
or less because
the refrigerant is retained in the compressor. Check the following points.
(a) Disconnect the cables of the compressor and measure the insulation resistance of the compressor itself.
If the resistance is 1M
W
or less, an insulation failure of another electrical charge part has occurred.
(b) If the resistance is 1M
W
or less, reconnect the compressor and turn ON the main power supply. The
compressor will warm up automatically. Check the insulation resistance again after applying current for at
least three hours. (Preheating time depends on the air condition, piping length or refrigerant condition.)
l
Before the GFCI is activated, check the rated capacity.
2: Stoppage of Compressor Operation
The compressor may NOT be operational for a maximum of four hours if the power supply is NOT turned ON in
advance.
At this time, the stoppage Code (d1-22) is displayed on the LCD of wired controller and the forced Thermo-OFF
function starts.
If operation of the compressor is necessary, turn ON the power supply of the water source unit, wait for 30
seconds and press PSW5 on the water source unit PCB for at least three seconds. The forced Thermo-OFF
function (d1-22) is cancelled and the compressor operation becomes available.
3: Working Range
Refer to Section 2.11 "Operation Temperature Range" in the Engineering Manual for Water Source Unit for
details.
NOTE:
Thermo-ON: The water source unit and some indoor units are running.
Thermo-OFF: The water source unit and some indoor units stay on, but don't run.
Before the test run, check that the unit is appropriately installed according to the Installation and Maintenance
Manual. After that, inspect the following items.
Turn OFF all the power supply switches.
Use a tester and make sure that all the switches are turned OFF.
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