Non-Fault Activated Problems – Cont’d
Problem / Symptom | Reason - Correction |
Water “foaming” inside the cylinder. | 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 |
| 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 |
| ( 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. |
Cylinder fills and overflows | 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 |
Unit turned on, fills to full amp draw, stops filling, and after a delay, the | Use the |
circuit breaker trips and the service light comes on. | 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. |
Unit cycle “on” and “off” rapidly | Check location and setting of high limit humidistat |
Cabinet leaks | Check for loose connections |
| Fill tube out of fill tee |
| Steam cylinder out of drain cup |
| Cabinet drain backing up, kink in drain line |
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