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Vol. 2.6 © 2020 Hanbell Precise Machinery Co., Ltd. All rights reserved
Confirmation
before start-up
1. Oil pump steering test: Use motor rear cap oil sight
glass to observe whether there is intake of
lubricating oil.
2. Motor Steering Test: After starting the push button,
observe the motor rear cap oil sight glass. The
steering direction should be in counterclockwise.
3.Check the following before starting the compressor :
a. Actuator=5%.
b. Hot gas bypass valve (HGBP)=100%
c. Medium pressure valve =0%
1. Motor fluid spray volume can be
observed from the display under
the motor rear cap. The
refrigerant level should not be
higher than the coil to avoid oil
agitating and spilling, and further
cause damage of the motor coils.
2. During compressor stable
operation, the oil level should be
controlled between M ~ H scale
on the oil display.
Start-up process
test and check
1.Load test:
a. After the previous start-up process is completed,
actuator opening should be from 5
→
10%, medium
pressure valve should be 0
→
100%, hot gas bypass
valve will still maintain at 100%.
b. Adjust the capacity according to the normal loading
and unloading control logic. Then the hot gas bypass
valve can be closed.
c. Ensure that the lubricant oil temperature of the
cooler outlet is 30 to 45 °C. Check the cooling
medium flow if the temperature is not within the
range.
d. Make sure feedback motor temperature of Pt100 (or
Pt1000) is at 30 ~ 90
℃
to avoid condensation at the
outer side of the motor.
e. After flooded chiller is fully loaded, observe the
condition of the refrigerant in the evaporator, the
copper tubes must be slightly visible, and the
bubbles created by evaporation of the refrigerant
can be seen.
f. Super heat temperature of discharge is appropriate
and should be at Tc +5 ~ 10
℃.
g. Measurement and recording on vibration and noise
h. Unloading test: Testing the load change is to test the
relationship between hot gas bypass valve opening
and safety margin line (or the inverter surge line).
1. The maximum liquid level of the
liquid refrigerant in the
economizer should not be
exceeding 1/2 of the economizer
muffler to avoid liquid
compression (or to install addition
liquid level protection switch or
delay pressure valve turning on).
2. Medium pressure sensor (or
external pressure gauge) and
medium pressure inlet gas
temperature sensor shall be
provided to calculate super heat
temperature of medium pressure
inlet. It is recommended to be
between 0 and 0.5
and
℃
observe the state of refrigerant in
the gas inlet sight glass.
3. If the operating current is greater
than the maximum continuous
operating current during loading,
the compressor should be
unloaded (IGV
↓
) to avoid
overloading the compressor
(over current protection).
4.Vibration measurement (new
machine overall capacity) :
Motor end
：≦
1.8 mm/s
Gear end
：≦
0.8 mm/s
Noise level
：＜
88 dB(A)
＊＊
Please refer to 6.7Compressor
vibration measuring point
Shut down process
test and check
1. Increase the temperature of chilling water and lower
the temperature of the cooling water (can be
determined and adjusted through pressure ratio
change trends).
a. Firstly turn on the hot gas bypass valve: 0%
→
100%
b. The Actuator is adjusted downward according to the
capable operation pressure ratio Pr (max) obtained
from safety margin equation.
c. The oil pump will delay 3 seconds to turn off after
shutdown of compressor.
2.Verify if the compressor motor stops rotating within
30 seconds; if not, please check whether pressure
ratio is a little higher and adjust opening of the hot
gas bypass valve as reference.
1. Time interval between re-start
and shutdown should not be less
than 20 minutes and ensure
motor temperature should not
exceed 70
℃.
