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5.2. Dual Fuel System Start-Up Defrost Temperating Sensor
Placement and Checkout
5.2.1. Start-Up the System (All Models)
1. Adjust all thermostat settings so that no demand will occur.
2. Apply power to the zone panel transformer and to the furnace and observe the
following: all four diagnostic LEDs will light; then each individual diagnostic LED
will light in sequence; then all four diagnostic LEDs will light and extinguish.
3. Finally,thestatuslightwillbegintoash,indicatingproperoperation.Perform
the gas heating checks using the information in the following sections.
5.2.2. Defrost Temperating Sensor Placement
Install the defrost temperating sensor (if used) where shown in the following
illustration. For additional information, see the installation instruction that came
with the Defrost Temperating Kit (67M41).
plenum
coil
furnace
front
Typical Upflow
Furnace Shown
Defrost temperating sensor / limit control
(if used in Option 3)
Figure 33. Defrost Tempering Sensor Placement
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