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Table 6—Maximum Capacity of Pipe*
NOMINAL
IRON
INTERNAL
PIPE
DIAMETER
SIZE
(IN.)
(IN.)
1/2
0.622
3/4
0.824
1
1.049
1-1/4
1.380
1-1/2
1.610
* Cubic ft of natural gas per hr for gas pressures of 0.5 psig (14–in. wc) or less
and a pressure drop of 0.5–in wc (based on a 0.60 specific gravity gas).
Ref: Table 12.2 ANSI Z223-2002/NFPA 54-2002.
→ Fig. 21a—Right Side Gas Entry Example
GAS
SUPPLY
MANUAL
SHUTOFF
VALVE
(REQUIRED
SEDIMENT
TRAP
UNION
Fig. 21b—Typical Gas Pipe Arrangement
ELECTRICAL CONNECTIONS
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in serious personal
injury or death.
Blower access panel door switch opens 115-v power to
control. No component operation can occur. Do not bypass or
close switch with panel removed.
See Fig. 25 for field wiring diagram showing typical field 115-v
wiring. Check all factory and field electrical connections for
tightness.
Field-supplied wiring shall conform with the limitations of 63°F
(33°C) rise.
LENGTH OF PIPE (FT)
10
20
30
40
175
120
97
82
360
250
200
170
680
465
375
320
1400
950
770
660
2100
1460
1180
990
A02327
A02035
ELECTRICAL SHOCK AND FIRE HAZARD
Failure to follow this warning could result in serious injury,
death, or property damage.
50
The cabinet MUST have an uninterrupted or unbroken ground
according to NEC ANSI/NFPA 70-2002 and Canadian Elec-
73
trical Code CSA C22.1 or local codes to minimize personal
151
injury if an electrical fault should occur. This may consist of
285
electrical wire, conduit approved for electrical ground or a
580
listed, grounded power cord (where permitted by local code)
900
when installed in accordance with existing electrical codes.
Refer to the power cord manufacturer's ratings for proper
wire gauge. Do not use gas piping as an electrical ground.
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FURNACE MAY NOT OPERATE
Failure to follow this caution may result in furnace operation
stopping and water pipes freezing during cold weather.
Furnace control must be grounded for proper operation or
control will lock out. Control is grounded through
green/yellow wire routed to gas valve and manifold bracket
screw.
115-V Wiring
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 7 for equipment electrical
specifications.
U.S. installations: Make all electrical connections in accordance
with National Electrical Code (NEC) ANSI/NFPA 70-2002 and
any local codes or ordinances that might apply.
Canadian installations: Make all electrical connections in accor-
dance with Canadian Electrical Code CSA C22.1 or authorities
having jurisdiction.
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FIRE HAZARD
Failure to follow this warning could result in serious injury,
death, or property damage.
Do not connect aluminum wire between disconnect switch
and furnace. Use only copper wire.
Use a separate, fused branch electrical circuit with a properly sized
fuse or circuit breaker for this furnace. See Table 7 for wire size
and fuse specifications. A readily accessible means of electrical
disconnect must be located within sight of the furnace.
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.
J-BOX RELOCATION
NOTE: If factory location of J-Box is acceptable, go to next
section (Electrical Connection to J-Box).
NOTE: On 14" wide casing models, the J-Box shall not be
relocated to other side of furnace casing when the vent pipe is
routed within the casing.
1. Remove and save two screws holding J-box. (See Fig. 22.)
→
NOTE: The J-Box cover need not be removed from the J-Box in
order to move the J-Box. Do NOT remove green ground screw
inside J-Box. The ground screw is not threaded into the casing
flange and can be lifted out of the clearance hole in casing while
swinging the front edge of the J-Box outboard of the casing.
19
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