Page 40
An unpowered, normally open (dry) set of contacts with
connections and may be connected to 24V or 120V. Any
the circuit can be connected to one of the provided neutral
terminals. This terminal is energized in the heating mode.
Install the room thermostat according to the instructions
-
ing connections in varying applications. If the furnace is
being matched with a heat pump, refer to the instruction
packaged with the dual fuel thermostat.
Thermostat Selection
CAUTION
Field wiring for both communicating and non-
communicating applications is illustrated in diagrams,
which begin on the next page.
Non-Communicating
In non-communicating applications the EL297UHV
is designed to operate in a SINGLE-STAGE mode or
TWOSTAGE mode using a conventional thermostat.
For optimal performance in non-communicating applica-
tions, Lennox recommends use of a ComfortSense
®
7000
high quality electronic digital thermostat or any other with
-
entials and adjustable stage timers.
Communicating
In communicating applications a communicating thermo-
stat must be used. Refer to the instructions provided with
the thermostat for installation, set-up and operation. In
communicating system all unused thermostat wire in the
wire bundle needs to be terminated inside and out. The
extra wires can terminate on the ‘C” terminal of the termi-
terminal and wire nut all the extra wires together. Termina-
tion on the outdoor control must match the indoor control.
Indoor Blower Speeds
Non-Communicating
When the thermostat is set to “FAN ON,” the indoor blower
the second-stage cooling speed when there is no cooling
or heating demand. The factory default setting is 38% of
cool speed. When the EL297UHV is running in the heat-
ing mode,the indoor blower will run on the heating speed
designated by the positions of DIP switches 11, 12 and 13.
When there is a cooling demand, the indoor blower will
run on the cooling speed designated by the positions of
DIP switches 5 and 6. First stage cooling will run at 70%
cool speed.
Communicating
NOTE - When the EL297UHV is used with a communicat-
ing thermostat, proper indoor blower speed selections are
made by the thermostat.
When the thermostat is set to “FAN ON,” the indoor blow-
-
tion. See TABLE 24 on page 72 for allowable circulation
speeds.
When there is a heating demand the fan will run on heat-
-
ing speed set using the thermostat in the installer setup
mode. The factory default is based upon 400 CFM a ton.
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)
• The furnace integrated control requires both correct
polarity 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)
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