IO137 24
BLOWER OFF DELAY
In the heating mode, the time period between the extinguishing of the burners and the circu-
lating 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
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
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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