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10 −Install the room thermostat according to the instruc-
tions provided with the thermostat. See table 13 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 inter-
fere with its accuracy. Wiring distance between the furnace
and discharge air sensor should not exceed 10 ft. when
wired with 18−gauge thermostat wire.
TABLE 11
Run Length Non Communicating
Wire Run Length
AWG #
Insulation/Core Types
Less than 100’ (30m)
18
Color−coded, temperature
rating 95
º
F (35
º
C) mini-
mum, solid core. (Class II
Rated Wiring)
More than 100’ (30m)
16
TABLE 12
Run Length Communicating
Wire Run Length
AWG #
Insulation/Core Types
Maximum length of wiring
for all connections on the
RSBus is limited to 1500
feet (457 meters).
18
Color−coded, temperature
rating 95
º
F (35
º
C) mini-
mum, solid core. (Class II
Rated Wiring)
Thermostat Selection
The SLP98UHV is designed to operate in a variable rate
capacity mode using a two−stage thermostat. The
SLP98UHV will automatically adjust firing rate based upon
thermostat cycle times.
The icomfort Touch
t
thermostat must be used in commu-
nicating 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
®
7000
high quality electronic digital thermostat or any other with
adjustable settings for 1st stage / 2nd stage on / off differen-
tials 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 mini-
mum).
Indoor Blower Speeds
NOTE − When the SLP98UHV is used with icomfort
Touch
t
thermostat, proper indoor blower speed
selections are made by the communicating thermo-
stat.
1 − When the thermostat is set to FAN ON," the indoor
blower will run continuously at a percentage of the sec-
ond−stage cooling speed when there is no cooling or
heating demand. The percentage is set using DIP
switches 6 and 7.
2 − When the SLP98UHV 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% us-
ing DIP switches 14 through 16 for the low heat speed
and 17 through 19 for the high heat speed.
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:
S
The furnace requires 120 volts + 10% (Range: 108
volts to 132 volts).
S
The furnace operates at 60 Hz + 5% (Range: 57 Hz to
63 Hz).
S
The furnace integrated control requires both polarity
and proper ground. Both polarity and proper grounding
should be checked before attempting to operate the
furnace on either permanent or temporary power.
S
Generator should have a wave form distortion of less
than 5% THD (total harmonic distortion).
