Lennox DAVE LENNOX SIGNATURE SL297UHNV, Руководство по установке

Страница: 31 / 66

Page 31
Electrical
WARNING
ELECTROSTATIC
DISCHARGE
(ESD)
Precautions and
Procedures
Electrostatic discharge can affect
electronic components. Take care
during unit installation and service to
protect the unit’s electronic controls.
Precautions will help to avoid control
exposure to electrostatic discharge
by putting the unit, the control and the
technician at the same electrostatic
potential. Touch hand and all tools
on an unpainted unit surface before
performing any service procedure to
neutralize electrostatic charge.
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.
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 side, clip the wire
ties that bundle the wires together. The excess wire must
be pulled into the blower compartment. Secure the excess
wire to the existing harness to protect it from damage.
INTERIOR MAKE-UP BOX INSTALLATION
MAKE-UP
BOX
Right Side
FIGURE 45
Refer to figure 48 for unit schematic and field wiring. See
figures 46 and 47 for communicating thermostat wiring in
communicating applications. Table 11 shows DIP switch
and on-board link settings for non-communicating ther-
mostat applications. Typical wiring schematic is shown in
figure 48.
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.
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.
NOTE - Unit nameplate states maximum current draw.
Maximum over-current protection allowed is shown in ta-
ble 10.
TABLE 10
SL297UHN Model
Maximum Over-Current
Protection (Amps)
040NV36B , 060NV36B,
080NV48C
15
080NV60C 20
Holes are on both sides of the furnace cabinet to facilitate
wiring.
Install a separate (properly sized) disconnect switch near
the furnace so that power can be turned off for servicing.
Before connecting the thermostat or the power wiring,
check to make sure the wires will be long enough for ser-
vicing at a later date. Remove the blower access panel to
check the length of the wire.
Complete the wiring connections to the equipment. Use
the provided unit wiring diagram and the field wiring dia -
grams shown in table 11 and figure 48. Use 18-gauge wire
or larger that is suitable for Class II rating for thermostat
connections.
Electrically ground the unit according to local codes or, in
the absence of local codes, according to the current Na-
tional Electric Code (ANSI/NFPA No. 70). A green ground
wire is provided in the field make-up box.
NOTE - The SL297UHNV furnace contains electronic
components that are polarity sensitive. Make sure that the
furnace is wired correctly and is properly grounded.
One line voltage “ACC” 1/4” spade terminal is provided on
the furnace integrated control. Any electronic air cleaner
or other accessory rated up to one amp can be connect-
ed to this terminal with the neutral leg of the circuit being
connected to the one of the provided neutral terminals.
See figure 49 for control configuration. This terminal is en -
ergized when the indoor blower is operating.