Electrical - Lennox SL280DFNV Installation Instructions Manual

The furnace must be isolated from the gas supply system
by closing the individual manual shut-off valve during any
gas supply system at pressures greater than or equal to ½
psig. (3.48 kPa, 14 inches w.c.). This furnace and its com-
ponents are designed, manufactured and independent-
ly certified to comply with all applicable ANSI/CSA stan-
dards. A leak check of the furnace and its components is
not required
IMPORTANT
When testing pressure of gas lines, gas valve must
be disconnected and isolated. See FIGURE 19. Gas
valves can be damaged if subjected to pressures
greater than 1/2 psig (3.48 kPa, 14 inches w.c.).
MANUAL MAIN
SHUT-OFF VALVE
WILL NOT HOLD
NORMAL TEST
PRESSURE
1/8 NPT PLUG
CAP
FIGURE 19

Electrical

ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
CAUTION
Electrostatic
electronic components. Take precautions
to neutralize electrostatic charge by
touching your hand and tools to metal
prior to handling the control.
WARNING
Electric Shock Hazard. Can cause injury
or death. Unit must be properly grounded
in accordance with national and local
codes.
WARNING
Fire Hazard. Use of aluminum wire with this product
may result in a fire, causing property damage,
severe injury or death. Use copper wire only with
this product.
CAUTION
Failure to use properly sized wiring and circuit
breaker may result in property damage. Size wiring
and circuit breaker(s) per Product Specifications
bulletin (EHB) and unit rating plate.
ISOLATE
GAS VALVE
FURNACE
discharge can affect
The unit is equipped with a field make-up box on the left
hand side of the cabinet. The make-up box may be moved
to the right side of the furnace to facilitate installation. If
the make-up box is moved to the right hand side, clip the
wire ties that bundle the wires together. Secure the excess
wire to the existing harness to protect it from damage.
See figures 21, 22 and 23 for thermostat wiring in com-
municating applications. Table 10 shows DIP switch and
onboard link settings for non-communicating thermostat
applications. Typical wiring schematic is shown in figure
24.
INTERIOR MAKE-UP BOX INSTALLATION
Cut the two wire ties to extend power wires for right side only
1 - The power supply wiring must meet Class I
restrictions. Protected by either a fuse or circuit
breaker, select circuit protection and wire size
according to unit nameplate.
NOTE - Unit nameplate states maximum current draw.
Maximum over-current protection allowed is shown in ta-
ble 9.
SL280DF MODEL
060NV36B
080NV60C
2 - Holes are on both sides of the furnace cabinet to
facilitate wiring.
3 - Install a separate (properly sized) disconnect switch
near the furnace so that power can be turned off for
servicing.
4 - Before connecting the thermostat or the power wiring,
check to make sure the wires will be long enough for
servicing at a later date. Remove the blower access
panel to check the length of the wire.
5 - Complete the wiring connections to the equipment.
Use the provided unit wiring diagram and the field
wiring diagrams shown in table 10 and figure 24. Use
18-gauge wire or larger that is suitable for Class II
rating for thermostat connections.
Page 19
(Right Side)
MAKE-UP
BOX
FIGURE 20
TABLE 9
Maximum Over-Current
Protection (Amps)
15
20