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99
VAPOR-LOGIC
®
VERSION 6 INSTALLATION AND OPERATION MANUAL
Table 99-1:
Troubleshooting guide (continued)
Heating issues
Issue
Possible causes
Actions
Heater burnout
• Water level is too low
• Replace probes .
• Improper wiring
• Verify proper voltage applied to heater .
• Verify proper electrical connections .
• Mineral buildup on heaters
• The humidifier may be undersized . Increase humidifier
capacity or replace with larger humidifier . Consult DriSteem .
• Inspect tank for severe mineral buildup on or around heater .
Increase skim duration, frequency of drain cycle, and/or
frequency of cleaning . Use softened makeup water .
• Contactors failed to open
• Replace .
• SSR failed closed
• Replace SSR controller .
• Heater corrosion
• Inspect heater for surface corrosion or pitting . Before replacing
burned-out heater verify chloride content in supply water is
very low .
Tank does not heat up .
• Over-temperature thermostat switch located
under heater wiring cover tripped
• Reset thermostat switch .
• Humidifier cover interlock switch
(Vaporstream models only)
• Humidifier cover not wired; adjust interlock switch .
• Combustion air switch or power vent switch
(GTS systems only)
• Check venting system and combustion dampers .
• Verify wiring and connections on switches are properly
connected .
• Incorrect or nonexistent control voltage
• Check for proper supply voltage on electrical diagram .
• Verify proper transformer voltage characteristics .
• Verify proper wiring of transformer .
• Check for control circuit voltage on electrical diagram . If
voltage is not present, troubleshoot boards and wiring system
for potential short circuit .
• Incorrect or nonexistent supply voltage to the
unit
• Check main line fuse .
• Check main line safety switch .
• Check heater fuses and wiring diagram .
• Duct RH above high limit set point
• Check for duct airflow .
• Verify operation of duct high limit switch or transmitter .
• No demand signal
• Check signal by others .
• Check for miswired connection .
• Verify in the Setup menu that humidifier is configured for
demand signal .
• Humidifier is in Standby mode
• Change mode to Auto .
Humidifier tank has proper
water level and is always
warm .
• Aquastat
• This is normal; the aquastat is maintaining a certain tank water
temperature within range of 40 ºF to 180 ºF (4 ºC to 82 ºC) .
• Readjust aquastat temperature to a lower set point .
• SSR power controller
• SSR control devices shorted closed; check/replace .
• Phase-to-phase wiring crossed .
• Contactor
• Contactor shorted closed; replace .
Continued
Troubleshooting guide
OPERATION