GRD.
LUG
CONTACTOR
GRD.
SCREW
M
T1
L1
L2
OUTDOOR UNIT
THERMOSTAT
INDOOR UNIT
T2
POWER WIRING
208/230-1-60
POWER WIRING
24V CONTROL WIRING
(NEC CLASS 2)
CIRCUIT
Jumper terminals E and W to
heat on first stage during
Emergency Heat.
LOW VOLTAGE TERMINAL BLOCK
IN AIR HANDLER WITH ELECTRIC HEAT
Check the low voltage terminal block on the indoor unit for the actual arrangement of the terminals.
BREAKER***
ALL WIRING TO BE IN ACCORDANCE WITH NATIONAL ELECTRIC CODE AND/OR LOCAL CODES
Connect power wiring to terminal block 3TB on units without electric heat or circuit breaker.
3,4
1
3
4
Terminal not used on all thermostats.
2
Y
O
W1 or 66
W
DEFROST
CONTROL
R
C
53 or W3
R
60 or W2
G
O
B or C
66 or W1
W
Y
R
O
G
W
Y
7 WIRES
RED
NOT USED
ADD WHEN STAND-BY
HEATER IS USED
B or C
L or X
T
E
FIELD
INSTALLED
JUMPER
1
2
2
BLK
YEL
ORG
WHT
BRN
X
FIGURE 4 - TYPICAL 1-Ø FIELD WIRING (Air Handler / Electric Heat)
Y
O
W1 or 66
W
GRD.
LUG
DEFROST
CONTROL
CONTACTOR
GRD.
SCREW
M
R
C
53 or W3
R
60 or W2
G
O
B or C
66 or W1
W
Y
R
O
G
W
Y
7 WIRES
OUTDOOR UNIT
THERMOSTAT
INDOOR UNIT
POWER WIRING
208/230-3-60
460-3-60
POWER WIRING
24V CONTROL WIRING
(NEC CLASS 2)
LOW VOLTAGE TERMINAL BLOCK **
IN AIR HANDLER WITH ELECTRIC HEAT
**Check the low voltage terminal block
on the indoor unit for the actual
arrangement of the terminals.
ALL WIRING TO BE IN ACCORDANCE WITH NATIONAL ELECTRIC CODE AND/OR LOCAL CODES
RED
NOT USED
ADD WHEN STAND-BY
HEATER IS USED
POWER
SUPPLY
208/230-3-60
460-3-60
B or C
L or X
Jumper terminals E and W to
heat on first stage during
Emergency Heat.
Terminal not used on
all thermostats.
T
E
FIELD
INSTALLED
JUMPER
1
1
2
2
2
BLK
YEL
ORG
WHT
BRN
X
FIGURE 5 - TYPICAL 3-Ø FIELD WIRING (Air Handler / Electric Heat)
515.26-N5Y
Unitary Products Group
5
