Bx Cable Installation; 24-V Wiring; Accessories; Venting - Carrier 070-08/024070 Installation, Start-Up, Operating And Service And Maintenance Instructions

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Fig. 23--Field-Supplied Electrical Box on
Furnace Casing
3. Fasten the electrical box to casing by driving two field-
supplied screws from inside electrical box into casing steel.
4. Remove and save two screws holding J-Box. (See Fig. 22.)
5. Pull limlace power wires out of l/2-inch diameter hole in
J-Box. Do not loosen wires from strain-relief wire-tie on
outside of J-Box.
6. Route furnace power wires through holes in casing and
electrical box and into electrical box.
7. Pull field power wires intn electrical box.
8. Remove cover li"om limmce J-Box.
9. Route field ground wire through holes in electrical box and
casing, and into lurnace J-Box.
10. Reattach lilrnace J-Box to lurnace casing with screws re-
moved in Step 4.
11. Secure field ground wire to J-Box green ground screw.
12. Complete electrical box wiring and installation. Connect line
voltage leads as shown in Fig. 25. Use best practices (NEC in
U.S. and CSA C22.1 in Canada) lot wire bushings, strain
relief, etc.
13. Reinstall cover to J-Box. Do not pinch wires between cover
and bracket.
POWER CORD INSTALLATION IN FURNACE J-BOX
NOTE: Power cords nmst be able to handle the electrical require-
ments listed in Table 5. Reli:r to power cord manufacturer's
listings.
1. Remove cover li"om J-Box.
2. Route listed power cord through 7/8-inch diameter hole in
J-Box.
3. Secure power cord to J-Box bracket with a strain relief
bushing or a connector approved lbr the type of cord used.
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4. Secure field ground wire to green ground screw on J-Box
bracket.
5. Connect line voltage leads as shown in Fig. 25.
6. Reinstall cover to J-Box. Do not pinch wires between cover
and bracket.
BX CABLE INSTALLATION IN FURNACE J-BOX
1. Remove cover from J-Box.
2. Route BX cable into 718-inch diameter hole in J-Box.
3. Secure BX cable to J-Box bracket with connectors approved
lor the type of cable used.
4. Secure field ground wire to green ground screw on J-Box
bracket.
5. Connect line voltage leads as shown in Fig. 25.
6. Reinstall cover to J-Box. Do not pinch wires between cover
and bracket.
24-V WIRING
Make field 24-v connections at the 24-v terminal strip. (See Fig.
23.) Connect terminal Y/Y2 as shown in Fig. 24 lot proper cooling
operation. Use only AWG No. 18, color-coded, copper thermostat
wire.
The 24-v circuit contains an automotive-type, 3-amp fuse located
on the control. Any direct shorts during installation, service, or
maintenance could cause this fuse to blow. If fuse replacement is
required, use ONLY a 3-amp li_se of identical size.
ACCESSORIES
1. Electronic Air Cleaner (EAC)
Connect an accessory Electronic Air Cleaner (if used) using
l/4-in li:male quick connect terminals to the two male l/4-in
quick-connect terminals on the control board marked EAC-1
and EAC-2. The terminals are rated lor 115 VAC, 1.0 amps
maxinmm and arc energized during blower motor operation.
(See Fig. 24.)
2. Hnmidifier (HUM)
Connect an accessory 24 VAC, 0.5 amp maximum humidifier
(if used) to the l/4-in male quick-connect HUM terminal and
COM-24V SCreWterminal on the control board thern_ostat strip.
The HUM terminal is energized when gas valve relay (GVR)
is energized. (See Fig. 24.)
NOTE: A field-supplied, 115-v controlled relay connected to
EAC terminals may be added if hunfidifier operation is desired
during blower operation.
NOTF: DO NOT connect lilrnace control HUM terminal to HUM
(humidifier) terminal on Thermidistat _M,Zone Controller or simi-
lar device. See Thermidistat _M, Zone Controller, thermostat, or
controller manufacturer's instructions lk)r proper connection.
VENTING
The furnace shall be connected to a listed factory built chinmey or
vent, or a clay-tile lined masonry or concrete chinmey. Venting
into an unlined masonry chinmey or concrete chinmey is prohib-
ited.
When an existing Category I furnace is removed or replaced, the
original venting system may no longer be sized to properly vent
the attached appliances. An improperly sized Category I venting
system could cause the lbrmation of condensate in the furnace and
vent, leakage of condensate and combustion products, and spillage
of cnmbnstion products into the living space.