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37
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'11 • KX-T-166
(1)
Make sure that a measurement between the power supply terminal block and ground, when measured with a 500V megger tester, is greater than 1 MΩ.
When the unit is left for a long time with power OFF or just after the installation, there is possibility that the refrigerant is accumulated in the compressor and the insulation
resistance between the contact terminals for power supply and grounding decreases to 1MΩ or around.
When the insulation resistance is 1MΩ or more, the insulation resistance will rise with crank case heater power ON for 6 hours or more because the refrigerant in the
compressor is evaporated.
(2) When the resistance of the signaling line terminal block is 100Ω or less before turning the power on, the power cables may be connected to the signaling line terminal block.
Check the wiring referring to the standard resistance value of 6-3.
(3)
Be sure turn ON the power supply to supply power to the crank case heater 6 hours before operation.
After supplying the power to the crank case heater, the compressor may not start unless the time mentioned above elapses. (For protection of compressor)
In such occasion, the 7-segment LED shows “dL
○○○○
”. Wait till the temperature in the compressor rises sufficiently after turning power on to the crank case heater,
before starting the test run.
(4)
Make sure that the bottom of the compressor casing is warm
.
(5) Be sure to fully open the service valves (liquid, gas) for the outdoor unit.
Operating the outdoor unit with the valves closed may damage the compressor.
(6)
Confirm that the power is supplied to all indoor units. It could cause trouble if there is any indoor unit which is not powered.
8. TEST OPERATION AND TRANSFER
9. CAUTIONS FOR SERVICING (for R410A and compatible machines)
(1) To avoid mixing of different types of oil, use separate tools for each type of refrigerant.
(2) To avoid moisture from being absorbed by the ice machine oil, the time for when the refrigerant circuit is open should be kept as short as possible.
(Within 10 min. is ideal.)
(3) For other piping work, airtighteness testing , vacuuming, and refrigerant charging, refer to section 4, REFRIGERANT PIPING.
(4) Diagnostic Inspection Procedures
For the meanings of failure diagnosis messages, please refer to the technical manual.
(5) 7-segment LED indication
Data are indicated when so chosen with the indication selector switch. For the details of indication, please refer to the technical manual.
(6) Internal wiring
After maintenance, all wiring, wiring ties and the like, should be returned to their original state and wiring route, and the necessary clearance from all metal parts should be
secured.
(2) Method of starting a test run for a cooling operation from an outdoor unit: please operate a remote control unit according to the following steps.
(a) Start of a cooling test run
○
Operate the unit by pressing the START/STOP button.
○
Select the “COOLING” mode with the MODE button.
○
Press the TEST RUN button for 3 seconds or longer.
The screen display will be switched from “Select with ITEM ”
→
“Determine with SET ”
→
“Cooling test run
▼
.”
○
When the SET button is pressed while “Cooling test run
▼
” is displayed, a cooling test run will start. The screen display will be switched to “COOLING TEST RUN.”
(b) Termination of a cooling test run
○
When the START/STOP button or the “TEMP SET ” button is pressed, a cooling test run will be terminated.
(1) Test run from an outdoor unit.
Whether CnS1 is set to ON or OFF, you can start a test run by using the SW5-1 and SW5-2 switches provided on the outdoor unit PCB.
Select the test run mode first.
Please set SW5-2 to ON for a cooling test run or OFF for a heating test run. (It is set to OFF at the factory for shipment)
Turning SW5-1 from OFF to ON next will cause all connected indoor units to start.
When a test run is completed, please set SW5-1 to OFF.
Note: During a test run, an indoor unit cannot be operated from the remote control unit (to change settings). (“Under centralized control” is indicated)
CAUTION
Please make sure that the service valves (gas, liquid) are full open before a test run. Conducing a test run with any of them
in a closed position can result in a compressor failure.
●
After completing the installation and test run, explain methods of use and maintenance to the customer, referring to the Instruction Manual. Ask the customer to keep the
installation manual safely together with the Instruction Manual.
●
Instruct the customer that the power should not be turned off even if the unit is not to be used for a long time. This will enable operation of the air conditioner any time.
(Since the compressor bottom is warmed by the crank case heater, seasonal compressor trouble can be prevented.)
8-1. Before starting operation
8-2. Test run
(When washing pipes using the re-fresh kit, refer to the instruction manual packed with the ref-fresh kit for the procedures, etc.)
8-3. Transfer
