PAGE 23 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
ERROR 112
LOW WATER PRESSURE:
Water pressure from the Humidaire Unit's water pump is
constantly monitored while the pump is running. The water pressure reading is taken
between the pump outlet and the butterfly water valve. If the water pressure is not above
the minimum limit at this location, the Humidaire Unit is shut down with ERROR 112.
This pressure can be read on a gage located in the middle compartment of the main
control cabinet. Possible causes of ERROR 112 follow:
•
Water level in the tank may be too low. Verify that the drain valve is
closed. Verify that the water supply is turned on.
•
Water pump may be running in reverse. Verify rotation.
•
Overload relay of pump motor starter may be tripped. Reset the water pump
motor overload relay (MOL).
•
Pump may be impeded with trash or sludge. Check cleanliness of tank and
water system.
•
Water nozzles may have been removed and not replaced. Verify presence of
all 28 water spray nozzles and end caps on nozzle header pipes.
•
Check the tube connected to the water pressure switch. In very cold weather,
water in it may be frozen which prevents the switch from working.
•
If all of the above are ok, check the adjustment of the Water Pressure Switch
(WPS).
ERROR 113
WATER PRESSURE SWITCH FAILURE:
Water pressure is being reported while the
water pump is not energized. Use the test program to verify proper operation of the
Water Pressure Switch (WPS). Input No. 26
(light #6 on the second input card with
switch in B position) should be off when the water pump is off or when pressure after the
pump but before the Water Butterfly Valve (WBV) is below 20 PSI. One easy way to
check adjustment on WPS is to momentarily reverse direction water pump rotates.
Pressure after pump will be slightly under 20 PSI and Input No. 26 should be off.
ERROR 114
WATER PUMP OVERLOAD RELAY TRIPPED:
This error may occur while the unit is
idle and first receives power, during normal operation, or during an automatic tank purge
operation. Reset the overload relay before clearing the error with the reset button. This
diagnostic is not active in the test program, although the overload relay continues to
protect the water pump motor. The following should be checked before continuing
operation following this error.
•
Verify setting of water pump motor overload relay MOL at 9.0 amperes
for 480V, or 11.5 amperes for 380V.
•
Verify voltage at one of the following, 380/50, 415/50, or 480/60.
