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FIVE WIRE
THREE-WIRE
HEATING-ONLY
BLOWER DOOR SWITCH
BLK
BLK
WHT
WHT
GND
AUXILIARY
115-V FIELD-
J-BOX
SUPPLIED
DISCONNECT
VOLTS
FURNACE
HERTZ
SIZE
PHASE
040---12/036040
115---60---1
060---12/036060
115---60---1
080---12/036080
115---60---1
080---16/048080
115---60---1
100---20/060100
115---60---1
120---20/060120
115---60---1
* Permissible limits of voltage range at which unit will operate satisfactorily.
† Unit ampacity = 125 percent of largest operating component's full load amps plus 100 percent of all other potential operating components' (EAC, humidifier,
etc.) full load amps.
‡ Length shown is a measured one way along wire path between unit and service panel for maximum 2 percent voltage drop.
** Time-delay type is recommended.
CAUTION
!
FURNACE MAY NOT OPERATE
Failure to follow this caution may result in intermittent
furnace operation.
Furnace control must be grounded for proper operation or
control will lock out. Control is grounded through
green/yellow wire connected to gas valve and burner
box screw.
115–V WIRING
Before proceeding with electrical connections, make certain that
voltage, frequency, and phase correspond to that specified on
furnace rating plate. Also, check to be sure that service provided
by power supply is sufficient to handle load imposed by this
equipment. Refer to rating plate or Table 6 for equipment
electrical specifications.
The furnace must be electrically grounded in accordance with
local codes; or in the absence of local codes, with the National
NOTE 2
W
C
R
W
C
R
O
N
T
GND
R
G
O
L
COM
NOTE 1
Y/Y2
24-V
TERMINAL
BLOCK
NOTES:
FURNACE
Fig. 31 - - Typical Heating and Cooling Application Wiring Diagram
Table 6 – Electrical Data
OPERATING VOLTAGE
MAX*
MIN*
127
104
127
104
127
104
127
104
127
104
127
104
FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-V WIRING
THERMOSTAT
G
Y
TERMINALS
CONDENSING
UNIT
TWO
WIRE
1.
Connect Y-terminal in furnace as shown for proper blower operation.
2.
Some thermostats require a "C" terminal connection as shown.
3.
If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire.
MAX
UNIT
UNIT
AMPACITY
AMPS{
FT (M)
8
10.8
34 (10.3)
9.4
12.5
29 (8.8)
9.4
12.5
29 (8.8)
9.6
12.8
29 (8.8)
12.1
15.9
36 (10.9)
12.1
15.9
36 (10.9)
Electric Code ANSI/NFPA 70 and/or the Canadian Electric Code,
CSA C22.1, Part I, if an external electrical source is utilized.
Use a separate, branch electrical circuit containing a properly
sized fuse or circuit breaker for this furnace. See Table 6 for wire
size and fuse specifications. A disconnecting means must be
located within sight from and readily accessible to furnace.
NOTE:
Proper polarity and proper grounding must be
maintained for 115-v wiring. If polarity is incorrect, control LED
status indicator will flash rapidly and furnace will NOT operate.
ELECTRIC
DISCONNECT
SWITCH
Fig. 32 - - Disconnect Switch and Furnace
- - 28 - -
FIELD-SUPPLIED
DISCONNECT
208/230- OR
460-V
THREE
PHASE
208/230-V
SINGLE
PHASE
GND
MAX
MAX
WIRE
FUSE/CKT
LGTH
BKR AMPS**
‡
15
15
15
15
20
20
COPPER
WIRE ONLY
ALUMINUM
WIRE
A99440
MIN
WIRE
GAGE
14
14
14
14
12
12
A93033
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