Lennox ZGB Series Unit Information page 55

TYPICAL TWO-SPEED BLOWER SCHEMATIC
This schematic is typical. See the wiring schematic on the unit for actual unit wiring.
1
HIGH SPEED PLUG LOW SPEED PLUG
K250-1
6
3 9
K250-2
L1
L2
L3
L2 L3
T2 T3
K3 - A
7
K239-1
4
TB1 - W1
TB1 - Y1
TB1 - R
7 4 9
3
P3-4 MSAV - Y
1 1 2
1
3
A A A
B B B
TB1-C
L2 L3
T2 T3
COOLING
Page 55
J / P JACK / PLUG DESCRIPTION
350 BLOWER HI/LO MECHANICAL SWITCHING
351 BLOWER HI/LO MECHANICAL SWITCHING
KEY COMPONENT
B3 MOTOR, BLOWER
DL3 DELAY,GAS 2,180 SEC DELAY ON BREAK
DL50 DELAY, 1.5 SEC. DELAY ON MAKE
DL55 DELAY, 2−STEP COMPRESSOR
K3, −1 CONTACTOR, BLOWER
RELAY, BLOWER
K37
K239 RELAY, Y1/W1 HI−LO SWITCHING RELAY
K249
CONTACTOR, COMPRESSOR OPERATION
K250 RELAY, Y2 HIGH SPEED BLOWER
L34 SOLENOID, TWO STAGE COMPRESSOR
S191 SWITCH, COMPRESSOR OPERATION
REV. 1