Yellow
A
B
C
D
B
G
R
Y
C
W
O
Y1
R
Y2
Green
A
B
C
D
Indoor
Unit
B
G
R
Y
Ventilator
Connection
A
B
C
D
User
Interface
FUSE
Fig. 2 — Ventilator (HRV / ERV) Connection
A03143
A
B
C
D
B
G
R
Y
C
W
O
Y1
R
Y2
A
B
C
D
Furnace
B
G
R
Y
Ventilator
(if used)
C
W2
O
Y
R
1 Spd. Heat Pump
A
B
C
D
User
Interface
FUSE
YellowGreen
Fig. 3 — Variable-Speed Furnace with 1-Spd. Heat Pump (Dual Fuel)
A03144
Yellow
A
B
C
D
B
G
R
Y
C
W
O
Y1
R
Y2
Green
A
B
C
D
Indoor
Unit
B
G
R
Y
Ventilator
(if used)
C
W2
O
Y1
R
Y2
Outdoor 2-Spd.
AC or HP
(R-22 Series-A unit)
A
B
C
D
User
Interface
FUSE
Fig. 4 — 2-Spd Non-Communicating AC or HP (R-22 Series-A Unit)
with Variable-Speed Indoor Unit
A03145
—3—