Lennox Allied Air EFV Series - Page 13

0650329-56 / 506265-03 Issue 1924 Page 13 of 13
Figure 5. Field Connections
Heat Pump with Electric Heat
Electric
FurnaceThermostat Heat Pump
R R
R
C1 C1
C
W2 EM
W1 W1
W
O O
O
Y2 Y2
Y/Y2
Y1 Y1
Y1
G G
Only for 2-Stage
Electric Heat
2-Stage System only;
for single-stage systems,
jumper Y1 to Y2
Air Conditioning with or without Electric Heat
Electric
FurnaceThermostat
Air
Condensing
Unit
R R
O
C C1
C
W2 EM
W1 W1
Y2 Y2
Y1 Y1
Y1
G G
2nd Stage Electric
Heat if used
1st Stage Electric
Heat if used
2-Stage System only;
for single-stage systems,
jumper Y1 to Y2
Connect O to R for proper
cooling blower delay
Y/Y2
Heat Only
Electric
FurnaceThermostat
R R
C C1
W2 EM
W1 W1
G G
2nd Stage
Electric Heat
if wired
Connect common wired to thermostat only if required. See thermostat instructions.