L.B. White Premier Owner's Manual And Instructions page 20

20
Premier Ductable Heaters
Ignition Control
The control sends and receives voltages to operate or
verify operation of components. Refer to the following
and Fig. 23 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. 23
Owner's Manual • Premier 350 2.0
Relay
The relay is responsible for supplying power to the
motor. See Fig. 24 for connection of wiring.
Terminal Function
COM Power Supply Contact
NO Load Contact
COIL Closes Contact COM & NO
FIG. 24
Transformer
The transformer, Fig. 25, reduces the main power
supply voltage to 24 VAC for operation of the ignition
control.
Without 24 VAC from the transformer, the ignition
control will not function, nor will the heater operate.
FIG. 25