PG80VTLA: Installation, Start-up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
22
Electrical Connection to J-Box
Electrical Box on Furnace Casing Side
A190278
Fig. 27 – Field-Supplied Electrical Box on Furnace Casing
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.
4. Remove and save two screws holding J-Box. (See Fig. 26).
5. Pull furnace power wires out of 1/2-in. (12 mm) 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 into electrical box.
8. Remove cover from furnace J-Box.
9. Route field ground wire through holes in electrical box and casing,
and into furnace J-Box.
10. Reattach furnace J-Box to furnace casing with screws removed 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. (See Fig. 27). Use best practices (NEC in U.S. for
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 must be able to handle the electrical requirements
listed in Table 6. Refer to power cord manufacturer’s listings.
1. Remove cover from J-Box.
2. Route listed power cord through 7/8-in. (22 mm) diameter hole in
J-Box.
3. Secure power cord to J-Box bracket with a strain relief bushing or a
connector approved for the type of cord used.
4. Secure field ground wire to green ground screw on J-Box bracket.
5. Connect line voltage leads. (See Fig. 24).
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 7/8-in. (22 mm) diameter hole in J-Box.
3. Secure BX cable to J-Box bracket with connectors approved for the
type of cable used.
4. Secure field ground wire to green ground screw on J-Box bracket.
5. Connect line voltage leads. (See Fig. 24).
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. 24 -
Fig. 36). Connect terminal Y/Y2 as shown in Fig. 28 - Fig. 35 for 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. fuse of identical size.
A00275
Fig. 28 – Two-Stage Furnace with Single-Speed Air Conditioner
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.
GROUND
NEUTRAL
LINE VOLTAGE
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