58TN0B/58TN1B: 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.
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A190278
Fig. 28 – 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. 27.
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. 28. 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 9. 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. 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 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. 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, Fig. 25. Connect
terminal Y/Y2 as shown in Fig. 25 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.
TEMPERATURE SENSOR
The furnace comes with a Return Air Temperature (RAT) sensor
installed on the control board and a Supply Air Temperature (SAT) for
installation in the field.
Install Supply Air Temperature (SAT) Sensor
1. Locate SAT sensor in main supply trunk after furnace and cooling
coil. Placing the SAT sensor after the first bend in main supply
trunk will yield the best readings. If this is not possible, placing the
sensor farther down the main trunk will allow for more mixing and
better results.
2. Drill a 1/4-in. hole at location in supply trunk where sensor will be
installed.
3. Insert sensor in hole and use as a template to mark the two (2)
mounting holes.
4. Drill two (2) 1/16-in. holes to accept No. 8 screws through
pre-drilled holes in duct temperature sensor back plate.
5. Use two (2) provided No. 8 sheet metal screws to mount the supply
air temperature sensor to the system.
6. Route SAT wire leads into furnace blower compartment along with
the thermostat wires. Use provided grommet to protect the wires
through the furnace casing.
7. Connect sensor wire leads to furnace control at the screw terminal
marked SAT. If additional wire length is needed, thermostat wire
and wire nuts can be used to extend the wires.
NOTE: When communications with the thermostat is present, the green
COMM light on the furnace control will be on.
Temperature Display
The SAT and RAT temperatures can be displayed on the control board 3
digit display. On the 3 digit display, navigate to (t°) and select F or C
(Default is off). When enabled, the display will cycle through the current
operating mode, SAT, RAT, and temperature differential during heating,
cooling and heat pump operation. The temperatures will not be displayed
in other operating modes.
ACCESSORIES
1. Electronic Air Cleaner (EAC)
Connect an accessory Electronic Air Cleaner (if used) using 1/4-in
female quick connect terminals to the two male 1/4-in
quick-connect terminals on the control board marked EAC-1 and
EAC-2. The terminals are rated for 115VAC, 1.0 amps maximum
and are energized during blower motor operation, see Fig. 29.
2. Humidifier (HUM)
Connect an accessory 24 VAC, 0.5 amp. maximum humidifier
(if used) to the 1/4-in male quick-connect HUM terminal and
COM/24-V screw terminal on the control board thermostat strip.
The HUM terminal is energized when the blower is operating
during a call for heat, see Fig. 29.
NOTE: DO NOT connect furnace control HUM terminal to HUM
(humidifier) terminal on Thermidistat
©
, Zone Controller or similar
GROUND
NEUTRAL
LINE VOLTAGE
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