Ignition Control; Relay; Transformer - L.B. White Premier 350 Owner's Manual And Instructions

24
Premier Ductable Heaters

Ignition Control

The control sends and receives voltages to operate or
verify operation of components. Refer to the following
and Fig. 22 to understand the ignition control's terminal
designators if doing voltage checks on the control.
L1: Main power supply voltage to control.
IND: Main power supply voltage from control to motor.
LED: Wire connection to red light of selector switch.
MV: 24 VAC from ignition control through both high
limit switches to gas control valve.
PS2: 24 VAC return from air proving switch back to
ignition control.
PS1: 24 VAC from ignition control to air proving switch.
W: 24 VAC return from thermostat to ignition control
FS: No terminal.
R: 24 VAC from ignition controller to thermostat.
X: 24 VAC from transformer to ignition controller
(without 24 VAC the contoller will not function.
C/COM: Earth ground for transformer and ignition
control.
Also refer to "Operation Sequence" within this manual
as needed to understand operation of the ignition
control during a call for heat.
FIG. 22

Relay

The relay is responsible for supply of power to the mo-
tor. Numbers adjacent to its male terminals for
reference of voltage received and supplied for trouble-
shooting. Refer to Fig. 23 and the following table for
connection of wiring and voltage checks.
Owner's Manual • Premier 350
Terminal Function
2 Not used.
4 Not used.
6 115 VAC from relay to start fan motor
8 115 volts to relay from power supply
0 Neutral for relay
1 115 VAC from ignition controller
(IND) to relay for coil closure
If the relay is receiving 115 volts at terminal 8 from
the the power supply, along with 115 volts from
the ignition control at terminal 1, but voltage is not
supplied to the motor from terminal 6, the relay is
defective.
FIG. 23
0
2
4
6
8
1

Transformer

The transformer reduces main power supply voltage
FIG. 24 to 24 VAC for operation of the the ignition
control.
Without 24 VAC from the transformer, the ignition
control will not function, nor will the heater operate.
FIG. 24