PAGE 29 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
ERROR 143
NO FAN INTERLOCK, ARE ALL FANS ON?:
This error is caused when an attempt is
made to start or operate the burner when no fan interlock signal is present. A fan
interlock relay is supplied with the unit to provide instant shutdown when the fan(s) stop.
The installing electrician is responsible for wiring the coil of this relay (FIR) to the fan
circuit.
ERROR 144
EXCESSIVE FLAME FAILURES:
During ignition and operation, flame failures are
counted. When the total comes to 3, the PLC shuts the unit down on ERROR 144. Use
the error log to determine which alarms the flame failure triggered. Knowing which three
alarms caused the error will help determine the problem.
ALARM 146
BURNER FAILED TO IGNITE:
This ALARM means that the Humidaire burner failed to
light during its ignition sequence. See the maintenance tips later in this section.
ALARM 150
PURGE VALVE FAILED OR CLOGGED:
This error occurs when purge water is unable
to flow through the Water Purge Valve (WPV). When the purge system is enabled, the
PLC expects to see a periodic input, from the Water Flow Meter (FM2) located before the
purge valve, indicating water flow. Check that the solenoid on the WPV is operating. It
may be necessary to take the valve apart and clean it.
ALARM 151
FLAME FAILED DURING OPERATION:
This ALARM means that the Humidaire
burner failed after the flame had been established. See maintenance tips below.
TIPS
THE FOLLOWING MAINTENANCE TIPS WILL HELP TO MINIMIZE FLAME
FAILURE ALARMS:
•
Clean the spark plug if it appears dirty.
•
With the power off, scrape the flame electrode and wipe the ceramic insulator with
a clean cloth. Make sure the power is switched off before doing this.
