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7 - One line voltage "EAC" 1/4" spade terminal is
provided on the furnace integrated control. Any
electronic air cleaner rated up to one amp can be
connected to this terminal with the neutral leg of
the circuit being connected to one of the provided
neutral terminals. See FIGURE 50 for location of
terminal. This terminal is energized when the indoor
blower is operating.
8 - One line voltage "HUM" 1/4" spade terminal is
provided on the furnace integrated control. Any
humidifier rated up to one amp can be connected to
this terminal with the neutral leg of the circuit being
connected to one of the provided neutral terminals.
See FIGURE 50 for location of terminal. This
terminal is energized in the heating mode when the
indoor blower is is operating.
9 - One 24V "H" terminal is provided on the furnace
integrated control terminal block. Any humidifier
rated up to 0.5 amp can be connected to this
terminal with the ground leg of the circuit being
connected to either ground or the "C" terminal. See
FIGURE 50 for location of terminal.
10 - Install the room thermostat according to the
instructions provided with the thermostat. See
TABLE 15 for thermostat connections. If the furnace
is being matched with a heat pump, refer to the
instruction packaged with the dual fuel thermostat.
NOTE - The discharge air temperature sensor is intended
to be mounted downstream of the heat exchanger and air
conditioning coil. It must be placed in free airflow, where
other accessories (humidifiers, UV lights etc.) will not in-
terfere with its accuracy. Wiring distance between the fur-
nace and discharge air sensor should not exceed 10 ft.
when wired with 18-gauge thermostat wire.
TABLE 13
Run Length — Non Communicating
Wire Run Length
AWG#
Less than 100' (30m)
More than 100' (30m)
TABLE 14
Run Length — Communicating
Wire Run Length
AWG#
Maximum length
of wiring for all
connections on the
RSBus is limited
to 1500 feet (457
meters).
Insulation/Core Types
18
Color-coded, temperature
rating 95ºF (35ºC)
minimum, solid core. (Class
16
II rated wiring)
Insulation/Core Types
Color-coded, temperature
rating 95ºF (35ºC)
18
minimum, solid core. (Class
II rated wiring)
Thermostat Selection
The SLP99DFV is designed to operate in a variable
rate capacity mode using a two-stage thermostat. The
SLP99DFV will automatically adjust firing rate based upon
thermostat cycle times.
A communicating thermostat must be used in communi-
cating applications. Refer to the instructions provided with
the thermostat for installation, set-up and operation
For optimal performance in non-communicating applica-
tions, Lennox recommends use of a ComfortSense® 7500
high quality electronic digital thermostat or any other with
adjustable settings for 1st stage / 2nd stage on / off differ-
entials and adjustable stage timers.
Lennox recommends the following two-stage thermostat
set-up for optimal variable rate capacity mode: First heat
stage differential set to 1/2 to 1 degree F; second heat
stage differential set to 1/2 or 1 degree F; second heat
stage upstage timer disabled, or set to maximum (1 hr
minimum).
Indoor Blower Speeds
NOTE - When the SLP99DFV is used with a commincat-
ing thermostat, proper indoor blower speed selections are
made by the thermostat.
1 - When the thermostat is set to "FAN ON," the indoor
blower will run continuously at a percentage of
the second- stage cooling speed when there is
no cooling or heating demand. The percentage is
set using DIP switches 6 and 7. See TABLE 23 for
allowable circulatuion speeds.
2 - When the SLP99DFV is running in the heating
mode, the integrated control will automatically
adjust the blower speed to match the furnace firing
rate. This speed can be adjusted up or down by
7.5% or 15% using DIP switches 14 through 16 for
the low heat speed and 17 through 19 for the high
heat speed. See TABLE 23 for allowable heating
speeds.
3 - When there is a cooling demand, the indoor blower
will run on the cooling speed designated by the
positions of DIP switches 8 through 11.
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 + 10% (Range: 108
volts to 132 volts).
•
The furnace operates at 60 Hz + 5% (Range: 57 Hz
to 63 Hz).
•
The furnace integrated control requires both po-
larity and proper ground. Both polarity and proper
grounding should be checked before attempting to
operate the furnace on either permanent or tempo-
rary power.
•
Generator should have a wave form distortion of
less than 5% THD (total harmonic distortion).
Page 34
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