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 furnace gas control valve and
accessible manual shutoff valve before test. After all connections
have been made, purge lines and check for leakage.
The gas supply pressure shall be within the maximum and
minimum inlet supply pressures marked on the rating plate with
the furnace burners ON and OFF.
Step 7—Electrical Connections
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. Failure to follow this
warning could result in personal injury or death.
See Fig. 22 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.
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, conduit approved for electrical ground or a
listed, grounded power cord (where permitted by local code)
when installed in accordance with existing electrical codes.
Refer to the power cord manufacturer’s ratings for proper
wire gage. Do not use gas piping as an electrical ground.
Failure to follow this warning could result in electrical shock,
fire, or death.
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 5 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 instal-
lations, all electrical connections must be made in accordance with
Canadian Electrical Code CSA C22.1 or authorities having juris-
diction.
Do not connect aluminum wire between disconnect switch
and furnace. Use only copper wire.
Use a separate branch electrical circuit with a properly sized fuse
or circuit breaker for this furnace. See Table 5 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 (J-Box Cover Installation).
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 screws holding auxiliary J-box. (See Fig. 23.)
2. Cut wire tie on loop in wires to J-box.
3. Locate box to desired location.
4. Fasten J-Box to casing with screw.
5. Route J-box wires within furnace away from sharp edges and
hot surfaces.
ELECTRICAL CONNECTION TO J-BOX
If manual disconnect switch is to be mounted on furnace,
select a location where a drill or fastener will not contact
electrical or gas components.
1. Attach electrical box to J-Box bracket.
2. Route wires through hole in electrical box and J-Box bracket.
3. Secure ground wire to green screw on J-Box bracket.
4. Connect line voltage leads as shown in Fig. 22.
FOR POWER CORD INSTALLATION
Power cords must be able to handle the electrical requirements
listed in Table 5. Refer to power cord manufacturer’s listings.
1. Route listed power cord through hole in J-Box.
2. Secure power cord to J-Box bracket with a strain relief
bushing or a connector approved for the type of cord used.
3. Secure ground wire to green screw on J-Box bracket.
Fig. 21b—Typical Gas Pipe Arrangement
A02035
UNION
SEDIMENT
TRAP
MANUAL
SHUTOFF
VALVE
(REQUIRED
GAS
SUPPLY
16
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