PAGE 28 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
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 136
GAS LEAK UPSTREAM – CHECK SSOV1:
This is a serious ERROR caused by a leak in
the first SSOV (this is the "upstream" gas valve). The Test Program may be run to
determine the severity of the leak. This ERROR is normally a result of contamination
under the valve seat of SSOV. If severe contact the factory for service.
ERROR 137
GAS LEAK DOWNSTREAM – CHECK PV & SSOV2:
The PLC has detected a possible
gas leak on the down-stream side. If this problem persists, try the following: Check that
second SSOV (this is the “downstream” valve) and PV are not leaking. Check for down-
stream gas leaks in gas train. Check for contamination in valve seats of SSOV and PV.
Refer to Test Program section “GLP SWITCH” for actuating the individual gas valves.
ERROR 140
NO GAS LEAK TEST PERFORMED, LAST 6 SHUTDOWNS:
Automatic gas leak testing
has been interrupted for the past 6 shutdowns. Each time the Humidaire Unit is turned
off, the PLC attempts to spend about 10 minutes performing an automatic leak check on
the gas valve assembly. These tests can be interrupted by simply turning off the power or
restarting the Humidaire Unit before the 10 minutes has ended. The PLC demands
however, that a leak test be performed at least once every 7 shutdowns. If each of the
past 6 shutdowns have had the leak test interrupted, the PLC will not start until the OK
button is pressed.
ERROR 141
FAN INTERLOCK BYPASSED:
Samuel Jackson Humidaire Units are provided with a fan
interlock relay (FIR) to provide immediate shutdown of the Humidaire Unit when the
humid air fan is turned off. This error indicates that an electrical signal is being received
through the fan interlock with no airflow present, effectively bypassing this important
safety feature.
ERROR 142
AIRFLOW SWITCH (AFS) BYPASSED:
This error indicates that an electrical signal is
being received from the air flow switch with no fan interlock signal present 10 minutes
after turning the Humidaire Unit off, effectively bypassing this important safety feature.
Check the adjustment of the air flow switch (AFS) and verify its operation.
