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Problem / Symptom Reason - Correction
Check drain valve and insure that water drains freely. If necessary,
clean or replace valve if defective.
Check water supply. If it is commercially softened, either increase the
drain threshold (R18) to 92% or reconnect the unit to raw water. Drain
and restart the unit. If the unit is connected to a hot water line,
reconnect to the cold water line.
If steam line is hard copper, drain cylinder and test unit operation
disconnected from steam line to insure flux from solder joints is not
causing foaming.
Water “foaming” inside the cylinder.
Observe the fill tee (GT-120). If water is going down the overflow and
the water level is low:
Check to insure that static pressure in the duct is not forcing water
down the overflow instead of allowing water to enter the cylinder.
Adjust the fill-metering valve to regulate the water flow to the cylinder.
( Figure 9)
Unit filling slower or at the same rate as it is boiling off, causing over
concentration and foaming. Fill rate must be increased. Open
metering valve.
If the fill valve is already fully open, get a water analysis and consult
the factory.
Check cylinder wiring (See Figure #11)
Check wiring of cylinder full interface.
If more than 1.9 mA AC is passing between the cylinder full electrode
and interface terminal #1, and when placing multimeter between
terminal #3 and ground yields approximately negative 11 VDC,
replace the interface.
Replace the circuit board.
Cylinder fills and overflows
Consult the factory after obtaining a water analysis
Use the “On-Off Drain” switch to drain the cylinder. Turn the capacity
adjustment pot (R39) on the main circuit board to 80% and restart the
humidifier.
Check the drain valve and clean or replace if necessary.
Unit turned on, fills to full amp draw, stops filling, and after a delay, the
circuit breaker trips and the service light comes on.
If the drain valve doesn’t come on before the service light illuminates,
replace the main circuit board.
Unit cycle “on” and “off” rapidly Check location and setting of high limit humidistat
Check for loose connections
Fill tube out of fill tee
Steam cylinder out of drain cup
Cabinet leaks
Cabinet drain backing up, kink in drain line
Non-Fault Activated Problems – Cont’d
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