Goodman GSM Installation & Operating Instructions Manual page 26

BLOWER OFF DELAY (GSMS ONLY)
In the heating mode, the time period between the extinguishing of the burners and the circulating
blower turning off, is known as the "Blower Off Delay." This time is factory preset at 150 seconds.
The 150 second delay can be changed to 120 or 90 seconds by changing the position of a jumper on
the Ignition Control.
HUMIDIFIER CONTROL (GSMS ONLY)
The screw terminal on the ignition control called "HUM" is designed to give a 24 VAC signal to a
humidistat in the heating mode. DO NOT USE ON HUMIDIFIERS WHICH USE 115 VAC.
ELECTRONIC AIR CLEANER CONTROL (GSMS ONLY)
The red-capped terminal on the ignition control marked "EAC" is to supply 115 VAC to an Electronic
Air Cleaner. This terminal is powered in both the heating and air conditioning modes when the
circulating blower is operating.
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