Electrical Connections; 115−V Wiring; J−Box Relocation; Electrical Connection To J−Box - Arcoaire N8MSN Series Installation Instructions Manual

ELECTRICAL CONNECTIONS

WARNING
!
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow safety warnings could result in
dangerous operation, serious injury, death or property
damage.
Improper servicing could
operation, serious injury, death or property damage.
S
Before servicing, disconnect all electrical
power to furnace.
S
When servicing controls, label all wires prior
to disconnecting. Reconnect wires correctly.
S
Verify proper operation after servicing.
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 NFPA 70−2011 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
20
result in dangerous
factory and field electrical
Specifications are subject to change without notice.
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) NFPA 70−2011 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.
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.
441 01 1402 06