FIG. 15
HIGH LIMIT SWITCH
FIG. 16
RESET BUTTON
TERMINAL
MOUNTING
LEG
Transformer
The transformer receives 120 volts and
reduces it to 24 volts. The 24 volts is supplied
to the ignition controller to start the ignition
process. See Fig. 17.
-- If 24 volts is not supplied from the trans-
former to the ignition controller, the heater
will not operate.
Guardian LP or Natural Gas Heater
SENSING
SURFACE
FLAME
Owner's Manual • Guardian
FIG. 17
TRANSFORMER
24 VOLT OUTPUT
TERMINAL
Relay
(AW325)
The relay is responsible for supply of power
to the motor, and has numbers adjacent to
its male terminals for reference of voltage
received and supplied for troubleshooting.
Refer to Fig. 18 and the following
table for connection of wiring and voltage
checks.
Terminal Function
2
115 volts from relay to motor
4
115 volts to relay from power supply
6
115 volts from relay to motor
8
115 volts to relay from power supply
0
115 volts from ignition controller
to relay for relay coil closure
1
Neutral for relay
If the relay is receiving 115 volts at terminal 0
from the ignition control, along with incoming
power supply voltage on terminals 4 and 8,
but voltage is not supplied to the motor from
terminals 2 and 6, the relay is defective.
FIG. 18
2
0
4
6
8
21
1