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Test Running
Technical Catalogue
TCGB0051 rev 0 - 09/2009
48
7.1. Preparation
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Tools and instruments
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High Pressure Compound Gauge. Low Pressure Compound Gauge. Electrical Tester and General Tools.
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CAUTION:
Switch ON the main power switch, and energise the oil heater for 12 hours before start-up, to sufficiently warm the oil.
Check to ensure that valves are correctly opened. If not opened, serious damage will occur to the compressor due to an
abnormally high pressure.
Remove the foreign particles and substances from the water piping, without going through the water coolers and clearing
the water strainer filter before running. Check to ensure that no foreign particle and substance exists in the water piping.
7.2. Test running procedure
Test running should be performed as follows, when the unit is wired according to the HITACHI standard wiring label.
1. Switch ON the field-supplied pump and the cooling tower, and the pump and cooling tower will be started
immediately. Check the condition and operation state of these components (Cooling tower: In the case of water-
cooled)
2. Fully open the liquid outlet stop valve.
3. Set the operation switch to “ON”, and the compressor will be started in a few minutes after this operation,
according to the following Operation Sequence Chart (Refer to chapter 10).
Test running should be accomplished as follows.
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DANGER:
Switch OFF main interruptor (M.I) for any work inside Electrical Box.
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CAUTION:
When the unit is wired according to the HITACHI standard wiring shown on the wiring label. Switch ON the main power
switch, and energize the oil heater for 12 hours before start-up to sufficiently warm the oil.
Each rotation direction of two rotors in the compressor is fixed so that a reversal phase protection device is equipped.
However, the rotation direction should be checked with a following method:
Confirm that phases R, S and T for the compressor is correctly connected. The correct phase connection can be
checked by a phase sequence indicator. If not, the compressor does not start due to activation of the reversal phase
protection device.
Cut the main switch and interchange two of three terminals, R, S and T on the main terminals at the field connection
side in the unit.
1. Operate the pump for chilled water and other auxiliary equipment such as fan coil units and air handling units.Check
to ensure that the chilled water flows sufficiently and that other auxiliary equipment operate properly.
2. Set the switch at the desired temperature.
3. Depress the “ON“ push button, the compressor will be started. Refer to “Standard Operation Sequence” (Refer to
chapter 10).
4. After system operation becomes stabilized, check the discharge and suction pressures by 7-segment on control
panel. Refer to the discharge and suction pressure curves (Refer to chapter 11).
5. Check to ensure that the thermostat functions properly.
6. Check to ensure that the control and protective devices function properly (Refer to chapter 11)
7. Starting timer and unload-starting timer are set at five (5), thirty (30) seconds, respectively, in accordance with
operation characteristics. Therefore, local adjustment should be avoided.
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NOTE:
A loud sound occurs when this compressor is stopped after the normal operation. However, this sound indicates no
abnormalities and stops within a few seconds by the activation of the check valve. This sound is due to the reverse
rotation of the screw rotors, resulting from the pressure difference between the discharge and the suction pressure.
Each compressor may show the different values of running current due to individual capacity control for each
compressor. This is not abnormal.
7.3. Instructions after test running
When the test running is completed, please instruct customers about operation and periodic maintenance methods
before leaving the unit, by using Installation, operation and maintenance manual. A special attention is required to
the following caution:
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CAUTION:
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Do not cut off the power source switch during the operating season. When the power source switch is cut off, the oil
heater for screw compressor is not energised, and the compressor might be damaged due to oil foaming at starting.
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When the operation season starts after long disconnection of the power source switch, please turn on the power source
switch 12 hours before starting operation.