FusionModule1000A20 CT Solution
Maintenance Guide
3 Routine Maintenance
Issue 01 (2019-02-25)
Copyright © Huawei Technologies Co., Ltd.
39
Main
tenan
ce
Item
Operation
Check Standard
Troubleshooting
Ther
mal
expan
sion
valve
Check the
soldering
points on the
sensing bulb
and the
equalizer
pipe.
The sensing bulb is secure.
No fracture exists on the
sensing bulb and valve
capillary tubes.
No crack exists in the
equalizer pipe soldering
points.
For details, contact Huawei
technical support.
Sight
glass
Check the
color of the
sight glass.
The color is not yellow.
If the color is yellow, there is
too much water in the system.
Contact Huawei technical
support.
Check
whether
bubbles exist
in the sight
glass.
No bubble exists in the sight
glass.
If you find air bubbles with
the sight glass, the cooling
system lacks refrigerant.
Adjust the expansion valve or
fill in refrigerant.
a. The superheat degree is the saturation temperature minus the temperature where the
sensing bulb is installed. Measure the pressure at the needle valve for the suction pipe and
find out the saturation temperature by using the measured pressure as an approximate
pressure inside the evaporator.
3.6.3 Monitoring System
Table 3-16
Semi-annual maintenance checklist for the monitoring system
Check
Item
Operation
Check Standard
Troubleshooting
Smart ETH
gateway
Power input
Input voltage:
45–55 V DC
Check the input power cables if the
input voltage is abnormal.
Power output
Output voltage:
45–55 V DC
For details, contact Huawei technical
support.
PWR
indicator
Steady on: The
power supply is
normal.
Off: No power
supply is available.
Check the input power cables.