Electrical Connections; 115−V Wiring; J−Box Relocation; Electrical Connection To J−Box - International comfort products N8MSN Installation Instructions Manual

ELECTRICAL CONNECTIONS

WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in 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 Figure 26 for field wiring diagram showing typical field
115−v wiring. Check all
connections for tightness.
WARNING
!
ELECTRICAL SHOCK AND FIRE HAZARD
Failure to follow this warning could result in personal
injury, death, or property damage.
The cabinet MUST have an uninterrupted or
unbroken ground according to NEC ANSI/NFPA
70−2008 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 gauge. Do not
use gas piping as an electrical ground.
CAUTION
!
FURNACE MAY NOT OPERATE
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.
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.
Make all electrical connections in accordance with National
Electrical Code (NEC) ANSI/NFPA 70−2008 and any local
codes or ordinances that might apply.
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.
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.
20
factory and field electrical
NOTE: Proper polarity must be maintained for 115−v wiring.
If polarity is incorrect, control LED status indicator light will
flash a status code 10 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−in. (356 mm) 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
Figure 23)
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.
2. Cut wire tie on loop in furnace wires attached to J−box.
3. Move J−Box to desired location.
4. Fasten J−Box to casing with two screws removed in
Step 1.
5. Route J−Box wires within furnace away from sharp
edges, rotating parts and hot surfaces.
ELECTRICAL CONNECTION TO J−BOX
Field−Supplied Electrical Box on Furnace J−Box Bracket See
Figure 24.
1. Remove cover from furnace J−Box.
2. Attach electrical box to furnace J−Box bracket with at
least two field−supplied screws through holes in elec-
trical box into holes in bracket. Use blunt−nose screws
that will not pierce wire insulation.
3. Route furnace power wires through holes in electrical
box and J−Box bracket, and make field−wire connec-
tions in electrical box. Use best practices (NEC in U.S.)
for wire bushings, strain relief, etc.
4. Route and secure field ground wire to green ground
screw on J−Box bracket.
5. Connect line voltage leads as shown in Figure 26.
6. Reinstall cover to J−Box. Do not pinch wires between
cover and bracket. Electrical Box on Furnace Casing
Side See Figure 24.
WARNING
!
FIRE OR ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury, death, or property damage.
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.
1. Select and remove a hole knockout in the casing
where the electrical box is to be installed.
NOTE: Check that duct on side of furnace will not interfere
with installed electrical box.
2. Remove the desired electrical box hole knockout and
position the hole in the electrical box over the hole in
the furnace casing.
3. Fasten the electrical box to casing by driving two field
supplied screws from inside electrical box into casing
steel.
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