TABLE 6 – Troubleshooting Guide (continued)
Problem Possible Cause Action
Water is flowing down drain
while humidifier is making
steam (Steam light illuminated
green or yellow).
O-ring is not properly inserted. Remove canister and make sure O-ring is seated in groove in drain valve.
Humidifier makes gurgling
sound.
Excess condensation in steam hose. Make sure steam hose has constant downward slope to humidifier or to tees
and traps in low spots of hose.
If hard pipe is used for dispersion system, make sure it is insulated.
Fill valve makes banging
sound.
Water hammer from line pressure. Make sure water supply line does not contact ductwork.
Install shock arrestor.
Install section of 1/4" braided fill line. Conform to local codes.
If water supply pressure is greater than 120 psi, install pressure reducer.
Humidifier will not fill. Saddle valve not open or pipe not
pierced.
Make sure saddle valve is properly installed and the valve is open.
Malfunctioning fill valve. Check valve function using the TEST MODE section of this manual.
Hoses are blocked. Check internal hoses and eliminate kinks or blockage.
Humidifier fills constantly. Internal wiring connections. Make sure blue/white wire jumpers (2) connecting Control PCB and Current Sensing
PCB are secure and properly oriented. See Wiring diagram Figure 10, 11 or 12.
Humidifier will not drain. Debris in drain valve blocking outlet port. Remove canister and clean debris from drain valve.
Malfunctioning drain valve. Check valve function using the TEST MODE section of this manual.
Water in duct from dispersion
tube.
Dispersion tube installed incorrectly. Install dispersion tube with tublets facing straight up.
Impurities in steam hose or pipe causing
foaming.
Rinse canister, fill hose and fill cup with clean water.
Service light flashing red
before end of humidification
season.
Canister full of mineral deposits. Remove canister and rinse with clean water.
Plumb humidifier to filtered water.
Plumb humidifier to softened water.
Humidifier runs in short cycles (does not
reach capacity).
Use blower activation feature on ADHC or run constant HVAC fan.
Yellow steam light. Humidifier operating below rated
capacity. (Normal operation for systems
plumbed to low conductivity water and
systems that operate for short cycles.)
Plumb humidifier to softened water.
Use blower activation feature on ADHC or run constant HVAC fan.
Operate humidifier on 240 volts.
To determine operating current, attach clamp-on ammeter to one of the
electrode wires on top of canister.
Dissolve one tablespoon of salt into one cup of hot water. Add to the fill cup in
1/4 cup increments until unit operates properly. Yellow steam light will clear
after first fill valve cycle at nominal amperage operation. Do not over salt.
System will drain and refill with clean water due to over current fault.
Humidifier is not satisfying
demand.
Control setting is too low. Adjust control to higher setting.
Control mounted in wrong location. See Installation Instructions with control for correct mounting location.
Short run times. Use blower activation feature on ADHC or run constant HVAC fan.
Humidifier capacity limited by input
power (120V).
Operate humidifier on 240 volts.
Increase capacity to 16.0 amps. Make sure breaker is appropriately sized.
Excess humidity. Control setting is too high. Adjust control to lower setting.
Control mounted in wrong location. See Installation Instructions with control for correct mounting location.
Solid red fill light. Fill valve has been filling for 40 minutes. Make sure high water pin electrode wire is securely installed.
High static pressure in the duct is causing
back pressure in the duct.
Make sure dispersion tube is not discharging into a duct with greater than 2.0
in.wg. static pressure.
Make sure dispersion tube tubelets are pointed up.
Solid red service light. Unit senses current 120% above nominal
and cannot lower amperage after three
drain cycles.
Rinse canister to remove mineral deposits or install a new canister.
CHECKING SYSTEM OPERATION & TROUBLESHOOTING (CONTINUED)
22
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