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915SB: Installation, Start-up, Operating and Service and Maintenance Instructions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

A190079

Fig. 33 – Typical Single-Stage Wiring Diagram

A190279

Fig. 34 – Field-Supplied External Electrical Box on Furnace Casing

Table 10 – Electrical Data

115-V Wiring

Furnace must have a 115-v power supply properly connected and

grounded.

NOTE:

Proper polarity must be maintained for 115-v wiring. If polarity

is incorrect, control LED status indicator light will flash rapidly and

furnace will

NOT

operate.

Verify that the voltage, frequency, and phase correspond to that specified

on unit rating plate. Also, check to be sure that service provided by

utility is sufficient to handle load imposed by this equipment. Refer to

rating plate or

Table 10

for equipment electrical specifications.

U.S.A. Installations

: Make all electrical connections in accordance with

the current edition of the National Electrical Code (NEC) NFPA 70 and

any local codes or ordinances that might apply.

Canada Installations

: Make all electrical connections in accordance

with the current edition of the Canadian Electrical Code CSA C22.1 and

any local codes or ordinances that might apply.
Use a separate, fused branch electrical circuit with a properly sized fuse

or circuit breaker for this furnace. See

Table 10

for wire size and fuse

specifications. A readily accessible means of electrical disconnect must

be located within sight of the furnace

J-Box Installation

The J-Box must be used when field line voltage electrical connections

are made to the furnace wiring harness inside the furnace casing. The

J-Box cover is not required if a field-supplied external electrical box is

attached to the outside of the furnace casing. The field ground wire and

furnace main ground wire are grounded when the J-Box bracket is

attached to the furnace and the field ground wire and factory ground wire

are secured to the bracket grounding screw. If the J-Box cover is not

used, the field and factory spliced connections must be located inside the

external electrical box. Do not leave splice connections unprotected

inside the furnace.
The J-Box cover, mounting bracket and screws are shipped in the loose

parts bag included with the furnace. See

Fig. 35

for J-Box mounting

locations.
The J-Box mounting bracket and green ground screw is used as a

grounding point for all line voltage wiring options. The J-Box cover may

115-V FIELD-

SUPPLIED

DISCONNECT

AUXILIARY
J-BOX

24-V

TERMINAL

BLOCK

THREE-WIRE

HEATING-ONLY

FIVE WIRE

NOTE 1

NOTE 2

FIELD-SUPPLIED
DISCONNECT

CONDENSING
UNIT

TWO
WIRE

FURNACE

C
O
N
T
R
O

COM

GND

FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-V WIRING

208/230- OR
460-V
THREE
PHASE

208/230-V
SINGLE
PHASE

BLOWER DOOR SWITCH

WHT

BLK

WHT

BLK

NOTES:

Connect Y-terminal in furnace as shown for proper blower operation.
Some thermostats require a "C" terminal connection as shown.
If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire.

GND

THERMOSTAT
TERMINALS

1.
2.
3.

COPPER

WIRE ONLY

ELECTRIC

DISCONNECT

SWITCH

ALUMINUM

WIRE

FURNACE

SIZE

VOLTS-

HERTZ-

PHASE

OPERATING VOLTAGE

RANGE

*. Permissible limits of the voltage range at which the unit operates satisfactorily.

MAXIMUM

UNIT

AMPS

UNIT

AMPACITY

†

†. 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.

MINIMUM

WIRE SIZE

AWG

MAXIMUM

WIRE LENGTH

FT (M)

‡

‡. Length shown is as measured one way along wire path between furnace and service panel for maximum 2 percent voltage drop.

MAXIMUM FUSE

OR CKT BKR

AMPS