Test Running; Preparation; Test Runing; Instructions After Test Running - Hitachi RCUE40AG1 Installation, Operation And Maintenance Instructions

TEST RUNNING

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7. TEST RUNNING

7.1. PREPARATION

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Tools and instruments
High Pressure Compound Gauge. Low Pressure
Compound Gauge. Electrical Tester and General Tools.
7.2. TEST RUNNING
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 it will be started
immediately and check the condition and operation state
of that.
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.
Test running should be accomplished as follows.
#
CAUTION:
When the unit is wired according to the HITACHI
standard wiring shown on the wiring label. Switch ON
the main power switch, and energise 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.

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:
#
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.
! 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.
! Set the switch at the desired temperature.
! Depress the "ON" push button, the condenser fans will
start to operate and the compressor will be started.
! Check the rotation direction of the condenser fans.
! After system operation becomes stabilised, check the
discharge and suction pressures by 7-segment on
control panel.
! Check to ensure that the thermostat functions properly.
! Check to ensure that the control and protective devices
function properly.
! Starting timer and unload-starting timer are set at five
(5), thirty (30) seconds and three (3) minutes,
respectively, in accordance with operation
characteristics. Therefore, local adjustment should be
avoided.
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.
#
CAUTION:
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.
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.