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912SD: Installation, Start-up, Operating and Service and Maintenance Instructions
WARNING
!
FIRE HAZARD
Failure to follow this warning could result in personal injury, death, or
property damage.
Do not connect aluminum wire between disconnect switch and furnace.
Use only copper wire. See
Fig.
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
FURNACE SIZE
30040E14
36040E17
36060E14
42060E17
48080E17
60080E21
60100E21
66100E21
60120E24
*. Permissible limits of the voltage range at which the unit operates 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
‡. Time-delay type is recommended.
**. Length shown is as measured one way along wire path between furnace and service panel for maximum 2 percent voltage drop.
CAUTION
!
FURNACE MAY NOT OPERATE HAZARD
Failure to follow this caution may result in intermittent furnace
operation.
Furnace control must be grounded for proper operation or else control
will lock out. Control must remain grounded through green/yellow wire
routed to gas valve and manifold bracket screw.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
36.
Table 10
for wire size and fuse
Table 10 – Electrical Data
OPERATING VOLTAGE
VOLTS-
*
RANGE
HERTZ-
PHASE
Maximum
Minimum
115-60-1
127
115-60-1
127
115-60-1
127
115-60-1
127
115-60-1
127
115-60-1
127
115-60-1
127
115-60-1
127
115-60-1
127
specifications. A readily accessible means of electrical disconnect must
be located within sight of the furnace.
FIVE WIRE
THREE-WIRE
HEATING-ONLY
BLOWER DOOR SWITCH
BLK
BLK
WHT
WHT
GND
GND
AUXILIARY
115-V FIELD-
J-BOX
SUPPLIED
DISCONNECT
FURNACE
Fig. 33 – Typical Single-Stage Wiring Diagram
ELECTRIC
DISCONNECT
SWITCH
Fig. 34 – Field-Supplied External Electrical Box on Furnace Casing
MAXIMUM
UNIT
UNIT
AMPACITY
AMPS
104
7.1
9.8
104
7.1
9.8
104
7.2
9.9
104
7.2
9.9
104
7.2
9.9
104
9.6
12.9
104
9.7
13.0
104
12.9
17.0
104
9.7
13.0
J-Box Installation
FIRE OR ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury, death, or
property damage.
High voltage field connections must be located in J-Box with furnace,
or in field supplied external disconnect mounted to furnace.
If field-supplied manual disconnect switch is to be mounted on furnace
casing side, select a location where a drill or fastener cannot damage
electrical or gas components.
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
25
FIELD 24-V WIRING
FIELD 115-, 208/230-, 460-V WIRING
FACTORY 24-V WIRING
FACTORY 115-V WIRING
NOTE 2
THERMOSTAT
W
C
R
G
Y
TERMINALS
W
C
R
O
N
T
R
G
O
L
COM
NOTE 1
CONDENSING
Y
UNIT
TWO
24-V
WIRE
TERMINAL
BLOCK
NOTES:
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.
COPPER
WIRE ONLY
ALUMINUM
WIRE
MAXIMUM
MINIMUM
WIRE
WIRE SIZE
LENGTH
†
AWG
‡
FT (M)
14
37 (11.5)
14
37 (11.5)
14
37 (11.4)
14
37 (11.4)
14
37 (11.4)
14
28 (8.7)
14
28 (8.7)
12
33 (10.3)
14
28 (8.7)
WARNING
!
FIELD-SUPPLIED
DISCONNECT
208/230- OR
460-V
THREE
PHASE
208/230-V
SINGLE
PHASE
GND
A190079
A190279
MAXIMUM
FUSE OR CKT
**
BKR AMPS
15
15
15
15
15
15
15
20
15
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