PAGE 55 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
ADJUSTMENT
The 14900A Lint Flue Scanner has been adjusted at the factory, but may require further adjustment. If
further adjustment is necessary:
1. Insure that 14900A has been wired into the system correctly. Apply power.
2. With the 14900A installed correctly in the lint flue and with cotton coming through the lint
flue, the red "LIGHT" LED should be on. The yellow "OPERATION" LED should be on and
remain on until cotton is no longer present and the time delay has timed out. If the "LIGHT”
LED fails to turn on with cotton in the system, turn the sensitivity adjustment clockwise until
"LIGHT" comes on. This adjustment is located on top of the 14900A.
3. When no cotton is present in the lint flue the "LIGHT" LED should be off. If the "LIGHT"
LED fails to turn off, adjust sensitivity counterclockwise until it goes off.
4. Set the sensitivity pot midway between the two operating points determined in steps 3 and 4 for
optimum operation. Make sure the green "STABILITY" light illuminates in both detecting and
non-detecting. The off time delay is set to maximum (12 seconds) and should not need further
adjustment. This prevents cycling the water pump.
TROUBLESHOOTING
If the control does not operate properly, follow the steps below (An AC voltmeter is the only test
equipment needed).
1. Remove the scanner from its mount. Look through the window and see if cotton can be seen
going past the window. If not, the scanner and mount must be moved to a better location.
2. Make certain that window glass and lenses of the control are clean and dry. An accumulation
of dust or lint on the window glass next to the control can affect its operation.
3. Check power to 14900A, by removing switch from mount, then remove top cover. Connect a
voltmeter across terminals 1 and 2. With the Humidaire Unit on and running, there should be
95 to 130 volts present.
4. With the scanner seeing cotton, the same voltage should appear across terminals 4 and 2. If no
voltage can be found, then trouble lies elsewhere in the circuit, not in this control.
5. If control does not respond to cotton properly, see Adjustment steps 2 to 4 above.
6. If, when the switch is tested, the yellow "OPERATION" LED comes on and the water pump
stays off, check the pump wiring and overload.
The maximum load for the relay contacts in the scanner is 3 amperes at 240 volts AC. The circuits of
Humidaire Units and Lint Slide Sprayers are within this limit. If used for other applications with a load
greater than this, interpose a contactor or relay between the scanner and the load. The voltage of the power
supply for the load can be different from that supplied to the scanner on terminals 1 and 2.
