Hitachi Set Free mini-HNRQ1 Series, Service Manual

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OPERATION
6. Test Run
Test run of outdoor units and indoor units should be performed one by one sequentially.
6.1 Before Test Run
(1) Do not operate the system until all the points have been examined and cleared.
●
Check to ensure that the refrigerant piping and transmission between outdoor unit and indoor units
are connected to the same refrigerant cycle. If not, it will cause an abnormal operation and a serious
accident.
●
Check to ensure that the resistance to ground is more than 1 megohm, 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 found and repaired. Do not impress the power supply wiring on the terminals for
transmission.
●
Check to ensure that the liquid stop valve and the gas stop valves are fully open.
●
Check to ensure that the power supply of air conditioning has been turn on for more than 12 hours, in
order to warm the compressor oil by the crankcase heater.
(2) Pay attention to the following items while the system is running.
●
Do not touch the compressor and the discharge gas pipes by hand, because their surface is very hot,
it may be lead to be scalded.
●
Do not touch any electrical components, otherwise, it may cause an electrical shock.
(3) Turn off the main power switch to the indoor unit and the outdoor unit and wait for more than 10 minutes
before electrical wiring work or a periodical check is performed.
6.2 Test Run by DIP Switch of Outdoor Unit
(1) Turn on the power supply of the outdoor and indoor units for more than 12 hours, the 7-segment display is
lighting.
(2) Check the 7-segment display of the outdoor unit. If there is any alarm code blinking, please examine
and clear it by referring to the table of alarm codes.
(3) Operate the air conditioning in the cooling or heating operation according to the ambient temperature.
The DIP Switch setting is shown as below. The operation will start in 1 minute after the DIP Switch setting
is done.
DIP Switch Original State Cooling Operation Heating Operation
DSW1
(4) The indoor unit automatically starts operating when the test run of the outdoor unit is set. The operation
continues for 2 hours without thermo-off, switch the DSW1 to the origin state, defrosting or a malfunction
has happened.
(5) During the test run, if any malfunction happens, please examine and clear it by referring to the table of
alarm codes.
(6) If the test run has been finished, please switch the DSW1 to the original state. Otherwise, the air
conditioning will not work normally.
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