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23.2.
Test run
Test run is testing whether the unit can run normally via preoperation. If the unit cannot run normally, find and
solve problems until the test run is satisfactory. All inspections must meet the requirements before performing
the test run. Test run should follow the content and steps of the table below:
The following procedure should be executed by experience and qualified maintenance men.
No.
Notice: before test, ensure that all power must be cut off, including the far- end power switch, otherwise, it may cause
casualty.
1
Ensure that the compressor of the unit is preheated for 8h.
Caution: heat the lubricating oil at least 8h in advance to prevent refrigerant from mixing with the lubricating oil, which
may cause damage to the compressor when starting up the unit.
Check whether the oil temperature of the compressor is obviously higher than the outdoor ambient
2
temperature.
Caution: if the oil temperature of the compressor is obviously higher than the outdoor ambient temperature, it means
that the heating tape of compressor is damaged. In that case, the compressor will be damaged easily. Therefore, repair
the heating tape before using the unit.
Check whether the phase sequence of the main power supply is correct. If not, correct the phase
3
sequence
firstly.
Recheck the phase sequence before start-up to avoid reverse rotation of the compressor which may damage the unit.
Apply the universal electric meter to measure the insulation resistance between each outdoor phase
4
and earth
as well as between phases.
Caution: defective earthing may cause electric shock.
No.
Cut off all temporary power supply, resume all the insurance and check the electricity for the last time.
1
Check the power supply and voltage of the control circuit;
rated
operating power.
No.
1
Check all the conditions needed to start up the unit: oil temperature, mode, required load etc.
Start up the unit, and observe the operation of compressor, electric expanding valve, fan motor and water
pump etc.
2
Note: the unit will be damaged under abnormal running state. Do not operate the unit in states of high
pressure and high current.
Others:
Estimation or suggestion on the general running situation: good, modify
Identify the potential problem (nothing means the installation and debugging are in accordance
with the requirements.)
a. problem of power supply and electric control system:
b. problem of load calculation:
Items for
c. outdoor refrigerant system:
acceptance
d. noise problem:
after
e. problem of indoor and piping system:
debugging
h. other problems:
During operation, it is needed to charge for the maintenance due to non-quality problems such as
incorrect installation and maintenance.
Is the user trained as required? Please sign. Yes( ) No( )
Start up the pretest procedure
Ready to start
Start up the unit
Acceptance
49
V must be ±10% within the range of
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