Herrmidifier Herrtronic AD Owner's Manual page 16

Problem / Symptom
Unit turned on. Unit cycles properly for short period of time. Then it
stops in the middle of a fill cycle and won't reset until boiling stops.
Water "foaming" inside the cylinder.
Cylinder fills and overflows
Unit turned on, fills to full amp draw, stops filling, and after a delay, the
circuit breaker trips and the service light comes on.
Unit cycle "on" and "off" rapidly
Cabinet leaks
NON-FAULT ACTIVATED PROBLEMS – CONT'D:
Herrtronic AD Series Installation, Operation and Service Manual
Reason - Correction
Check cylinder full interface connections. Make sure terminal
Check cylinder connections (See Figure #11)
Check items in next troubleshooting tip concerning foaming.
Check amperage between cylinder full electrode and cylinder full
interface terminal #1. If it is greater than 7.0 mA AC, take a fill water
sample and consult the factory.
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.
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.
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.
If the drain valve doesn't come on before the service light illuminates,
replace the main circuit board.
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 drain backing up, kink in drain line