PAGE 38 of 84 HU-SOUTHWEST-1480 GAS-FIRED HUMIDAIRE UNIT
© SAMUEL JACKSON, INCORPORATED 2005 ALL RIGHTS RESERVED
MOD MOTOR
The operation and adjustment of the Gas Valve Motor (GVM) and Water Valve Motor
(WVM) are checked here. The water pump is also jogged on here to check pump rotation.
If pump rotation is wrong, kill 3 phase electrical power to the unit with the disconnect
located on the side of the cabinet, verify that no voltage is present, then reverse two of the
3 phase leads going to the pump’s Motor Contactor (MC).
Refer to Water Valve Linkage Adjustment Drawing CAT2571A later in this manual for
adjustments to linkages between Water Butterfly Valve (WBV) and Water Valve Motor
(WVM). The PLC will supply 4mA VDC control signal to the WVM to close the valve
and 20 mA VDC control signal to open the valve.
Press these buttons to
toggle between closed
and open to check the
operation and adjustment
of the gas and water
valves.
Press this button to jog water pump on.
