Lennox ZGB Series - Blower Schematics and Wiring; Two-Speed Blower Schematic Details; Wiring Diagram Notes and Legend

Page 55
TYPICAL TWO-SPEED BLOWER SCHEMATIC
This schematic is typical. See the wiring schematic on the unit for actual unit wiring.
COOLING
REV. 1
J / P JACK / PLUG DESCRIPTION
HIGH SPEED PLUG
K250 K239
A
B
K37
A
B
K3
A
B
L34
9
1
3
2
7
1
4
1
3
3
6
9
1
4
7
DL50
DL3
K250-1
K250-2
K239-1
K3 - A
TB1 - W1
TB1 - Y1
TB1 - R
P3-4 MSAV - Y
L2 L3
T2 T3
K3
L2 L3
T2 T3
K37
350
BLOWER HI/LO MECHANICAL SWITCHING
351
BLOWER HI/LO MECHANICAL SWITCHING
TB1-C
L2
L1
L3
LOW SPEED PLUG
KEY COMPONENT
B3
MOTOR, BLOWER
K3, −1 CONTACTOR, BLOWER
DL50
DELAY, 1.5 SEC. DELAY ON MAKE
K37
RELAY, BLOWER
K239
RELAY, Y1/W1 HI−LO SWITCHING RELAY
K250
RELAY, Y2 HIGH SPEED BLOWER
L34SOLENOID, TWO STAGE COMPRESSOR
DL3
DELAY,GAS 2,180 SEC DELAY ON BREAK
S191 SWITCH, COMPRESSOR OPERATION
K249
CONTACTOR, COMPRESSOR OPERATION
DL55
DELAY, 2−STEP COMPRESSOR