Vertiv Liebert PEX+ Series User Manual

Vertiv | Liebert PEX+ Chilled Water | User Manual 96
Diagnosis and Troubleshooting
8.2. Fault Diagnosis and Treatment of Infrared Humidifier
8.2.1. Infrared Humidifier Troubleshooting
Refer Table 8-2 for diagnosis and treatment of the infrared humidifier.
Table 8-2 Diagnosis and Treatment of Infrared Humidifier
Symptom Potential Causes Items to be Examined or Handled
Humidification
ineective
No water in water
pan
Check the water supply is normal
Check whether the water supply solenoid valve is working
Check the state of the high water-level switch and the water level regulator
Check whether the water supply pipe is not clogged
The humidification
contactor does not
close
Check the contactor, and check the circuit voltage of the contactor
Check the opened safety devices of the infrared humidifier: Water pan over-
temperature protection switch and lamp over-temperature protection switch.
Humidifier main
power failure
Check whether the humidifier MCB is closed. In humidifier contactor closed
state, check whether L1, L2 and L3 voltages are normal.
Infrared humidifier
lamp burned
Replace the lamp.
8.3. Refrigeration System - Fault Diagnosis and Treatment
Refer Table 8-3 for fault diagnosis and refrigeration system.
Table 8-3 Refrigeration System Fault Diagnosis and Treatment
Symptom Potential Causes Items to be Examined or Handled
No cooling or
dehumidification
Control panel failure
Check if there is 24 Vac voltage between P51-1 and E1, P52-1 and E1. If
there is not, then the control panel has failures
Failure to turn on the water
valve
Check if there is 10 Vdc voltage between water valve Vdc/mA and E5
terminal. If there is, then the water valve has failures. Please replace
the water valve.
Contactor closed,
no heating eect
Power supply failure of
electrical heater
Check if the electrical heater MCB is turned-on.
When the heating contactor is closed, check if the L1, L2 and L3
voltages of contactor are normal
Electrical heater burnout
Turn-o the power supply and check the condition of the electrical
heater

Vertiv Liebert PEX+ Series Specifications

General

Brand	Vertiv
Model	Liebert PEX+ Series
Category	Air Conditioner
Language	English