Lennox 97G2DFV Installation Instructions Manual page 37

Indoor Blower Speeds
1. When the thermostat is set to "FAN ON," the indoor
blower will run continuously at approximately 50%
of the second stage cooling speed when there is no
cooling or heating demand. See Table 19 for allowable
continuous circulation speeds.
2. When this unit is running in the heating mode, the
indoor blower will run on the heating speed designated
by the positions of DIP switches 1 (A,B,C,D) of the
HEAT jumper plug. When the heat demand is satisfied,
the indoor blower will continue to run at the low stage
heat cfm for the duration of the user-selected heat
blower off delay. The user can select one of the four
preset heat blower off delays (60/90/120/180 sec) by
repositioning the movable shunt on the 5-pin header
on the ignition control.
60
90
120
180
Figure 56. Heat Blower Off Delay Moveable Shunt
3. When there is a cooling demand, the indoor blower will
run on the cooling speed designated by the positions
of DIP switches (A, B, C, D) of the COOL jumper plug.
See Figure 58.
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 polarity
and proper ground. Both polarity and proper 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).
508405-01
Heat Blower OFF
Delay Moveable
Shunt
Electrical Wiring
Risk of electrical shock. Disconnect electrical power
at the circuit breaker or service panel before making
electrical connections. Failure to disconnect power
supplies can result in property damage, personal injury,
or death.
The furnace must be grounded and wired in accordance
with local codes or, in the absence of local codes, with the
National Electrical Code ANSI/NFPA No. 70 (latest edition)
and/or CSA C22.1 Electrical Code (latest edition) if an
external electrical source is utilized.
In all instances, other than wiring for the thermostat,
the wiring to be done and any replacement of wire shall
conform with the temperature limitation for Type T wire
–63°F (35°C) rise.
Connect a sufficiently sized wire with ground to the
furnace's line voltage connections and ground wire. Refer
to the furnace rating plate for electrical characteristics
to be used in sizing field supply wiring and overcurrent
protection.
The line voltage supply should be routed through a readily
accessible disconnect located within sight of the furnace. A
junction box on the furnace side panel is provided for line
voltage connections. Refer to the furnace wiring diagram
for specific connection information.
Proper polarity of the supply connections ("HOT" and
"NEUTRAL") must be observed to ensure that safety
controls provide the protection intended.
A connection to the unit's ground wire and actual earth
ground (typically a ground stake or buried steel pipe) must
be maintained for proper operation.
Thermostat
Install a room thermostat according to the instructions
furnished with it. Select a location on an inside wall that
is not subject to drafts, direct sunshine, or other heat
sources. The initial heat anticipator setting should be equal
to the total current draw of the control circuit. Low voltage
thermostat connections are to be made to the integrated
ignition/blower control board as indicated on the wiring
diagram.
NOTE: The automatic heat staging option allows a single
stage thermostat to be used with two stage furnace models.
To activate this option, move the jumper pin (see Figure 57)
to desired setting (5 minutes or 10 minutes). The furnace
will start on 1st stage heat and stay at 1st stage heat for
the duration of the selected time before switching to 2nd
stage heat. W1 on the control board must be connected to
W1 on the thermostat.
Issue 2341
WARNING
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