L.B. White Premier CS350DF 2.0 Owner's Manual And Instructions page 20

20
Premier Ductable Heater
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.
IND: Main power supply voltage to motor.
LED: Not used
MV: 24 VAC from ignition control through both high
limit switches to gas control valve.
PS2: 24 VAC return from air pressure switch.
PS1: 24 VAC to air pressure switch.
W: 24 VAC return from thermostat switch
FS: No terminal.
R: 24 VAC to thermostat switch
X: 24 VAC from transformer switch (without 24 VAC,
the controller 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 350DF 2.0
Relay
The relay is responsible for supply of power to the
motor. See Fig. 24 for connection of wiring.
Terminal Function
Power Supply Contact
COM
Load Contact
NO
Closes Contact COM & NO
COIL
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