PAGE 32 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
started. This error occurs when the air thermocouple (TCA) connection is an open circuit
indicating a loose wire or a failed thermocouple sensor.
ERROR 166
SSOV1 PROOF OF CLOSURE SWITCH FAILED:
A Proof of Closure (POC) switch on
the bottom of first SSOV (“upstream” valve) that tells the PLC when the valve is closed
has failed. Check for loose wires and that SSOV valve is actually opening.
If the operator is aware of the safety issues involved in bypassing the function of the
Proof of Closure switch (POC), a temporary software bypass is available by pressing the
“BYPASS” button on the error screen.
ERROR 170
LOW PLC BATTERY:
The battery in the PLC is low and needs replacing. The Humidaire
will continue to operate with a low battery or without a battery, but all custom user
settings will be lost.
ERROR 172
FLAME LASTS TOO LONG AFTER SHUTDOWN:
This error means that flame is
detected for more than 12 seconds following closure of all gas valves. This indicates a
probable gas leak in the system. In the Test Program, use the Gas Low Pressure Switch
Test “GLP SWITCH” to determine the severity of the leak. Consult the factory for
service recommendations.
ERROR 174
PURGE SYSTEM OFF FOR 24 HOURS:
This error occurs when the purge system has
been disabled for more than 24 hours of pump run time. When treating the Humidaire
Unit with Powdered Acid Descaler, the purge system should be disabled to prevent debris
that is dislodged from plugging the water purge valve (WPV). This error will occur if the
operator forgets to enable the purge system after dumping the water and acid out after
descaling treatment.
ERROR 177
POWER FAULT DURING OPERATION STAGE:
This error means that electrical power
was disconnected while the burner was on or during the 10 minute leak test after
shutdown. Check for faulty supply wiring connections.
