SYMPTOM
POSSIBLE
CAUSE
CHECK OR REMEDY
Unit in call for humidification,
humidifier will not operate
Humidifier not
receiving power
Verify ON/OFF/DRAIN switch is in ON position.
Check fuses or CB's and replace or reset if necessary.
Humidifier Contactor pulled in,
but no water enters canister
No water available
to unit
Check external water shut-off valves.
Clogged fill line
strainer
Clean or replaced fill line strainer
Excessive arcing in canister
Drain valve clogged
or defective
Verify that drain valve operates freely when activated. Clean valve and replace if defective.
Flush canister several times and replace if arcing persists.
Improper water
supply
If water is commercially softened, reconnect humidifier to raw water supply, drain canister
and restart. If connected to hot water supply, reconnect to cold water.
Insufficient drain
rate
Verify that drain valve operates freely when activated. Clean valve and replace if defective.
Flush canister several times and replace if arcing persists.
Excessive mineral
content in water
Analyze mineral content of water. If mineral content is excessive contact Vertiv™ Technical
Support.
Table 8.2 Steam generating humidifier troubleshooting guide
8.5.2 Humidifier Troubleshooting Steps
Auto On/Off/Drain switch in On position—unit will not fill:
When the On/Off control circuit is made and the Auto On/Off/Drain switch is pushed to On, the 24V
holding coil of the primary contactor should energize. The resulting magnetic pull closes the high-voltage
contacts with a distinct and audible “clunk.” If the contactor will not make the connection, then inspect
the following while referring to the wiring diagram:
• Check for 24V across terminals 18 and 26 on the PC board.
• The low-voltage 3A fuse located in the control box may be blown.
• The contactor holding coil may be open or shorted.
• The switch may be defective.
Recheck that the Auto On/Off/Drain switch is still On. If it is, shut off the main disconnect and check fuses
or breaker of the main disconnect. If they are serviceable, turn power back on.
To test for a defective Auto On/Off/Drain switch, connect a wire from the fuse directly to Terminal 6 on
the external controls strip. If the contactor activates, the On side of the switch is defective. If the contactor
does not activate, the PC board could be defective.
If the 3A control fuse blows when the wire from the fuse touches Terminal 6 on the external controls strip,
the contactor holding coil may be shorted. Replace contactor if necessary.
After the necessary components have been replaced and the contactor pulls in, there is line voltage to
the cylinder and the control sequence can begin.
Vertiv | Liebert CRV Installer/User Guide | 89
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