PAGE 24 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
•
Check for low voltage condition.
•
Verify free rotation of motor shaft and pump impeller.
ERROR 115
TRU-TEMP (LOW WATER TEMPERATURE):
See TRU-TEMPERATURE
DIAGNOSTIC SYSTEM section for more information.
Timed-Response-Under-
TEMPERATURE occurs when water temperature is unable to reach the setpoint
specified by the operator within 30 minutes of water pump operation. Failure of the
water temperature to reach a reasonable setpoint within 30 minutes, normally indicates a
problem in the Humidaire Unit's spray chamber.
Clogged water nozzles are a common problem in the spray chamber. Each time the water
pump turns on, or the operator adjusts the water temperature, the unit has 30 minutes to
approach the water temperature setpoint before shutting down due to ERROR 115.
A reasonable temperature range has been preset to fit most situations. If the operator
desires to fine tune maintenance practices with an adjustment to this range, please contact
the factory for assistance. Changing the allowed temperature deviation is done from the
SETUP screen. See
ADDITIONAL SETTINGS
section of manual for information on
adjusting the deviation value. The default value is 5
°
F.
Common problems that cause the TRU-TEMP ERROR are:
•
Water nozzles need cleaning. If several water nozzles are choked, water
temperature will fall and the Humidaire's performance will be impeded. With
the burner off, open spray chamber door and have a helper go to the TEST
PROGRAM section, then to MOD MOTOR section and press H20 PUMP
POWER to jog water pump on. Carefully examine each of the 28 nozzles to
determine that all are in good shape and have no clogs.
•
The water float valve can create this problem if it malfunctions, or is improperly
adjusted. The valve can pour cold fresh water into the tank, and subsequently
out the overflow, in a volume that prevents water temperature from reaching its
normal operating setpoint.
•
Remember that the water temperature can never go significantly above the air
temperature. The software limits the water temperature setting to no higher than
3 degrees above the air temperature setting. Maximum output from the
Humidaire Unit is obtained by setting the air and water temperatures
approximately equal to each other. Output is reduced by moving the
temperatures apart. Review the
“How Do I Control the Amount of Moisture
Output?”
section earlier in this manual for operating tips for the Humidaire Unit
or call the factory for advice on setting appropriate temperatures.
•
Worn water pump impeller.
•
Blockage of water pump inlet screen.
•
Failed Water Valve Motor (WVM) or Gas Valve Motor (GVM).
