Delta HCH1850 User Manual page 55

Abnormal
No.
phenomenon
7 The set point
cannot be reached.
8 There is a water
stain in the cabinet.
9 There is water
leakage at the
cabinet bottom.
Possible cause
The fans are old or
abnormal.
The sensor detection is
abnormal.
The PID parameters are
wrong.
The heat load exceeds
the cooling capacity.
The coil is blocked.
temperature is too high.
The control module is
wrong.
The actuator is abnormal.
The humidity is too high.
The inlet water
temperature is too low.
The fan speed is too low.
The drain pump is
abnormal.
The piping is abnormal.
The condensed water
51
Chapter 7
Elimination method
Inspect the fans and change abnormal
ones if necessary.
Inspect the sensors.
Refer to 4.7 PID Setting.
Reduce the heat load or increase cooling
units.
Carry out the coil washing procedures.
the chiller (5~15 degrees are ideal).
Repair or replace the control box.
Repair the actuator.
Use an external de-humidifier to control
the data center's humidity or enable
the force mode to reduce the internal
humidity of the data center.
Adjust the water supply temperature of
the chiller (5-15 degrees are ideal).
Adjust the fan speed.
Confirm the functions of the drain pump
are normal.
Inspect if the chilled water pipeline and
other pipelines are normal.
O b s e r v e i f t h e w a t e r l e v e l i n t h e
condensed water pan is too high, inspect
the condensed water pump or make
sure the condensed water pipe (without
bending, damage or blockage) is correctly
connected and the draining is normal.
If upper piping with condensed water
pump is adopted, the vertical lift shall not
Troubleshooting