G6RA, G6RK Service Manual 25
Polarity and Ground
The G6 furnace will not operate if loss of ground occurs.
Every effort should be made at the installation to provide a
good ground. If old 2-wire romex exists it should be replaced
with a 2-wire w/ground. A cold water line could be used
provided that the connection or grounding occurs before any
di-electric fittings and provided no plastic pipe is used inside
or outside the building.
Blower Door Switch
The blower door switch is located near the center of the
furnace. (See Figure 25.) The switch is normally open and
closes with the proper installation of the bottom door of the
upflow models or top inside blower door on downflow models.
Its purpose is to break the 115 vac power supply when the
door is removed exposing the blower.
Check-out procedure (using ohm meter).
1. Turn off incoming power supply.
2. Disconnect the wires on the switch.
3. With the switch at rest, no continuity should be read.
4. Now depress the switch plunger, the OHM meter should
show continuity or 0 ohms. If not, replace switch.
The switch can also be checked with the 115 vac power
supply on. If the switch is manually depressed and 115 vac
is read across it, then the switch is bad and must be replaced.
Transformer (See Figure 26)
The transformer supplies control voltage (24 vac) by stepping
down the supply (primary) voltage from 115 vac to 24 vac
(secondary voltage). Transformers are rated by VA. VA is the
volt/amp or total wattage the secondary can handle. When a
transformer is replaced the VA should be of an equal or
greater value.
Figure 24. Polarity and Ground
Figure 25. Figure 26.
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