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F80CSU and G80CSU: Installation, Start–Up, Operating and Service and Maintenance Instructions
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 gas valve mounting 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 6
for equipment electrical specifications.
Make all electrical connections in accordance with current edition of
National Electrical Code (NEC) NFPA 70 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
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 rapidly flash RED
and furnace will NOT operate.
Unit Size
Hertz- Phase
0401712
0601716
0802120
1002120
*. Permissible limits of the voltage range at which the unit operates satisfactorily.
†. Unit ampacity = 125 percent of largest operating component's full load amps plus 100 percent of all other potential operating components' (EAC, humidifier, etc.) full load
amps.
‡.
Length shown is as measured one way along wire path between unit and service panel for maximum 2 percent voltage drop.
**. Time-delay type is recommended
4. Remove and save two screws holding J-Box.
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, see
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.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 6
for wire size and fuse
Table 6 – Electrical Data
Operating Voltage
Volts-
Maximum
Minimum
115-60-1
127
115-60-1
127
115-60-1
127
115-60-1
127
Fig.
24.
NOTE: If factory location of J-Box is acceptable, go to next section
(ELECTRICAL CONNECTION TO J-BOX).
1. Remove and save two screws holding J-Box.
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.
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
Electrical Box on Furnace Casing Side
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.
*
Range
Maximum
Unit
Unit Amps
Ampacity
104
11.4
12.6
104
11.4
12.6
104
17.8
18.9
104
17.8
18.9
12. Complete electrical box wiring and installation. Connect line
voltage leads, see
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.
15
J-BOX RELOCATION
WARNING
!
Minimum
Maximum
Wire Size
Wire Length
†
AWG
ft
14
29
14
29
12
30
12
30
Fig.
23. Use best practices (NEC in U.S. for wire
Maximum
‡
Fuse or CKT
**
BKR
Amps
15
15
20
20
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