Piping should be pressure and leak tested in accordance with
NFGC in the United States or NSCNGPIC in Canada, local, and
national plumbing and gas codes before the furnace has been
connected. If pressure exceeds 0.5 psig (14-in. wc), gas supply
pipe must be disconnected from furnace and capped before
pressure test.
If test pressure is equal to or less than 0.5 psig (14-in. wc), turn off
electric shutoff switch located on gas valve before test. It is
recommended that ground joint union be loosened before pressure
testing. After all connections have been made, purge lines and
check for leakage at furnace prior to placing it into service.
The gas supply pressure shall be within the maximum and
minimum inlet supply pressures marked on the rating plate with
the furnace burners ON at HI-HEAT and OFF.
Step 8—Electrical Connections
See Fig. 28 for field wiring diagram showing typical field 115-v
and 24-v wiring. Check all factory and field electrical connections
for tightness.
Blower access door switch opens 115-v power to furnace
control. No component operation can occur. Do not bypass or
close switch with panel removed. Failure to follow this
warning could result in personal injury or death.
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. Failure to follow this caution will result in intermittent
unit operation.
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 4 for equipment electrical
specifications.
Make all electrical connections in accordance with National
Electrical Code (NEC) ANSI/NFPA 70-2002 and any local codes
or ordinances that might apply. For Canadian installations, all
electrical connections must be made in accordance with Canadian
Electrical Code CSA C22.1 or authorities having jurisdiction.
Field-supplied wiring shall conform with the limitations of 63°F
(33°C) rise.
Use a separate branch electrical circuit containing a properly sized
fuse or circuit breaker for this furnace. See Table 4 for wire size
and fuse specifications. A disconnecting means must be located
within sight from and readily accessible to furnace.
NOTE: Proper polarity must be maintained for 115-v wiring. If
polarity is incorrect, furnace control status code indicator light will
flash rapidly and furnace will NOT operate.
The cabinet MUST have an uninterrupted or unbroken ground
according to NEC ANSI/NFPA 70-2002 and Canadian Elec-
trical Code CSA C22.1 or local codes to minimize personal
injury if an electrical fault should occur. This may consist of
electrical wire or conduit approved for electrical ground when
installed in accordance with existing electrical codes. Do not
use gas piping as an electrical ground. Failure to follow this
warning could result in electric shock, fire, or death.
J-Box Relocation
1. Remove 2 screws holding auxiliary J-box. (See Fig. 30.)
2. Rotate J-box 180° and attach box to left side, using holes
provided.
Fig. 27—Typical Gas Pipe Arrangement
A93324
UNION
SEDIMENT
TRAP
MANUAL
SHUTOFF
VALVE
(REQUIRED)
GAS
SUPPLY
Table 4—Electrical Data
UNIT
SIZE
VOLTS—
HERTZ—
PHASE
OPERATING
VOLTAGE RANGE
MAXIMUM
UNIT
AMPS
MINIMUM
WIRE
SIZE
MAXIMUM WIRE
LENGTH (FT)‡
MAXIMUM FUSE OR
CKT BKR AMPS**
Maximum* Minimum*
040-14 115—60—1 127 104 8.9 14 31 15
060-14 115—60—1 127 104 8.9 14 31 15
080-14 115—60—1 127 104 8.9 14 31 15
080-20 115—60—1 127 104 13.8 12 32 20
100-20 115—60—1 127 104 13.8 12 32 20
120-20 115—60—1 127 104 13.8 12 32 20
* 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 as measured 1 way along wire path between unit and service panel for maximum 2 percent voltage drop.
** Time-delay type is recommended.
20
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