Lennox SL280DFNV Installation Instructions Manual page 21

Generator Use - Voltage Requirements
The following requirements must be kept in mind when
specifying a generator for use with this equipment:
• The furnace requires 120 volts (Range: 102 volts to 132
volts)
• The furnace operates at 60 Hz + 5% (Range: 57 Hz to
63 Hz)
Communicating Enabled Furnace and Non-
Communicating Outdoor Unit
OPTIONAL
DISCHARGE
AIR SENSOR
COMMUNICATING
THERMOSTAT
CLIP ON-BOARD LINK
W915 (Y1 TO Y2) FOR
TWO-STAGE OPERATION
Outdoor Unit
COMMUNICATING FURNACE
OPTIONAL
OUTDOOR
AIR SENSOR
NON-COMMUNICATING
OUTDOOR AIR
CONDITIONING UNIT -
1 OR 2 STAGE
nace/air handler control and four wires between the outdoor unit and the furnace/air
handler control. When a thermostat cable with more than four wires is used, the extra
wires must be properly connected to avoid electrical noise. The wires must not be left
disconnected.
Use wire nuts to bundle the four unused wires at each end of the cable. A single wire
should then be connected to the indoor unit end of the wire bundle and attached to the
"C" terminals as shown below.
Communicating Integrated Control
• The furnace integrated control requires both correct
polarity and proper ground. Both polarity and prop-
er grounding should be checked before attempting to
operate the furnace on either permanent or temporary
power
• Generator should have a wave form distortion of less
than 5% THD (total harmonic distortion)
Communicating Enabled Furnace and
Communicating Enabled Outdoor Unit
COMMUNICATING FURNACE
OPTIONAL
DISCHARGE
AIR SENSOR
OPTIONAL
OUTDOOR
AIR SENSOR
COMMUNICATING
THERMOSTAT
Figure 21
Page 21
DOOR AIR CONDITIONING
OR HEAT PUMP UNIT
Communicating Thermostat