Vertiv Liebert CW Series User Manual

Symptom
Possible
Causes
Check or Remedy
Actuator Motors
No24VAC
powerto
motor
Check for 24VACbetweenP22-3 andP22-5 (open), or P22-1 andP22-5 (closed).
Chilledwateror hot
water/steamvalve
not opening
Motor
operatesbut
valve won’t
open
Check linkage for adjustment andbe sure thatitistight onthe valve.
ModulatingMotors
No24VAC
powerto
motor
Check control fusesandpower atPCB andPCT.
Nosignal
from control
Check DCvoltage onprintedcircuitboardinmotor. TerminalNo. 1 isgroundedandNo. 3 ispositive. DCvoltage
shouldvary from0.8to2.0VDCoraboveastemperature control isvariedbelowroom temperatureoncooling
valve orabove roomtemperatureonheatingvalve.
Motor not
working
Removewiresonterminal No. 1 andNo. 3 fromthe motor (donotshort). With24VACpower fromTR toTRjumper
terminal 1 and2 onmotortodriveopen. Removejumper todriveclosed, if motorfailsto work, replace it.
Table 10.2 Chilled water troubleshooting
Symptom Possible Cause Check or Remedy
No
humidification
Humidifier pannot filling
Check watersupply.
Check fillvalve operation
Check drainstandpipe adjustment
Check for cloggedwaterline
Check floatorientation(see )
Control not callingfor
humidity
Check monitor status
Humidity contact not
pullingin
Check visually. If contact ismade, check line voltage aftercontactorandfusesorCBs.
Check for openhumidifier safety stat. JumperbetweenterminalsP35-6andP35-5. If contactor pullsin,
replace safety. Remove jumper.
Humidifier bulbburned
out
Replacebulb. Loosenleadonoldbulb. Trimexcessleadlengthonnewbulbtoavoidshorts.
Table 10.3 Humidifier—infrared troubleshooting
Vertiv | Liebert® CW™Installer/User Guide
78

Vertiv Liebert CW Series Specifications

General

Brand	Vertiv
Model	Liebert CW Series
Category	UPS
Language	English