Test Run; Before Test Run - Hisense Hi-FLEXi S Series Technical, Installation, Maintenance

Test Run

7. Test Run
Test run should be performed according to this section.
● Do not operate the system until all the check points have been cleared.
As for the test run of indoor unit and water module, check Technical Catalog attached to the indoor unit and water module.

7.1 Before Test Run

(1) Check to ensure that the refrigerant piping and transmission between outdoor unit, SW BOX, indoor units or water
modules are connected to the same refrigerant cycle. If not, it will cause an abnormal operation and a serious accident.
Check that the DIP switch setting of the refrigerant cycle number and the unit number for the indoor units and water
modules apply to the system. Confirm that the DIP switch setting on the printed circuit board of the indoor units, water
modules and the outdoor units are correct. Especially pay attention to the setting of lift between indoor units and outdoor
unit, the refrigerant No. and the terminal resistance.
(2) Check to ensure that the electrical resistance is more than 1MΩ, by measuring the resistance between ground and the
terminal of the electrical parts. If not, do not operate the system until the electrical leakage is located and fixed (Refer to
"Caution for Insulation Resistance" for details.). Do not impress the voltage on the terminals for transmission.
(3) Check to ensure that each wire, L1, L2, L3 is correctly connected at the power source. If incorrectly connected, the unit
will not operate and the remote control switch will indicate the alarm code "05". In this case, check and change the phase
of the power source according to the attached sheet on the reverse side of the service cover.
(4) Check to ensure that the switch on the main power source has been ON for more than 4 hours to warm up the
compressor oil by the heater. When powered, the outdoor units will not operate (Stoppage Code d1-22) immediately if it
is in protection status due to low compressor oil temperature. In case of operating within 2 hours, release the protection
control as follows:
* Supply power to the outdoor unit.
* Wait for 30 seconds
* Push PSW5 on the outdoor PCB more than 3 seconds in order to release the d1-22.
* In case of using remote control switch for release, push "Air Flow" and "Auto Louver" simultaneously for 3 seconds.
(5) Main Unit Label
In case of the combination of basic units, attach the main unit label on a visible spot of the main unit (outdoor unit A), so
that the outdoor unit A can be identified easily. Do not attach the main label on the sub unit (outdoor unit B, C and D).
(6) Water circuit check before test run (In case of the water module is utilized in the system)
●Before the test run, please check again if all the water pipe construction is in the proper state.
●Inject water into the water module and make sure that the plate type heat exchanger is filled with cycling water; open the
water pump and exhaust valve and make sure that air in the unit and pipeline is already exhausted.
●Force the running of the water pump, read the value on the pressure gauge and confirm the action of the flow switch to
check if the water cycle system is properly installed. (Refer to installation manual of water module)
●After the initial test run, please clean the water filter and make sure that the filter mesh is clean and free of impurities.
Caution for Insulation Resistance:
If total unit insulation resistance is lower than 1MΩ, the compressor insulation resistance may be low due to retained
refrigerant in the compressor. This may occur if the unit has not been used for a long period.
(1) Disconnect the cables to the compressor and measure the insulation resistance of the compressor itself. If the resistance
value is over 1MΩ, then insulation failure has occurred for other electrical parts.
(2) If the insulation resistance is less than 1MΩ, disconnect the compressor cable from the inverter PCB. Then, turn on the
main power to apply current to the crankcase heater. After applying current for more than 3 hours, measure insulation
resistance again. (Depending on the air conditions, pipe length or refrigerant conditions, it may be necessary to apply the
current for a longer period of time.) Check the insulation resistance and reconnect the compressor.
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