Tempstar F8MTL, Руководство по установке

Страница: 20 / 52

20 441 01 2101 05
Specifications are subject to change without notice.
Figure 24 − Relocating J − Box
FACTORY
INSTALLED
LOCATION
ALTERNATE
FIELD
LOCATION
ELECTRICAL CONNECTION TO J − BOX
6. Reinstall cover to J − Box. Do not pinch wires between
cover and bracket.
Electrical Box on Furnace Casing Side. See Figure 25
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.
!
WARNING
Figure 25 − 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
Figure 24)
5. Pull furnace power wires out of 1/2 − inch (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 as shown in Figure 23. 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 7. Refer to power cord
manufacturer’s listings.
1. Remove cover from J − Box.
2. Route listed power cord through 7/8 − inch (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 as shown in Figure 23.
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 − inch (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 as shown in Figure 23.
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
Figure 23) Connect terminal Y/Y2 as shown in
Figure 26 − Figure 32 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.