Typical Operating Characteristics; Blower Operation And Adjustment; External Static Pressure; Blower Speed Taps - Lennox EL180UHNE Series Unit Information

V-TYPICAL OPERATING CHARACTERISTICS
A-Blower Operation and Adjustment
NOTE- The following is a generalized procedure and
does not apply to all thermostat controls.
1 - Blower operation is dependent on thermostat control
system.
2 - Generally, blower operation is set at thermostat sub­
base fan switch. With fan switch in ON position, blower
operates continuously. With fan switch in AUTO position,
blower cycles with demand or runs continuously while
heating or cooling circuit cycles.
3 - Depending on the type of indoor thermostat, blower
and entire unit will be off when the system switch is in
OFF position.
B-Temperature Rise (Figure 21)
Temperature rise for EL180UHNE units depends on unit in­
put, blower speed, blower horsepower and static pressure
as marked on the unit rating plate. The blower speed must
be set for unit operation within the range of "TEMP. RISE
°F" listed on the unit rating plate.
TEMPERATURE RISE
Supply Duct Temperature
Return Duct Temperature
Temperature Rise =
Supply Air
Return Air
FIGURE 21
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C-External Static Pressure
1 - Tap locations shown in figure 22 .
2 - Punch a 1/4" diameter hole in supply and return air
plenums. Insert manometer hose flush with inside
edge of hole or insulation. Seal around the hose with
permagum. Connect the zero end of the manometer to
the discharge (supply) side of the system. On ducted
systems, connect the other end of manometer to the
return duct as above.
3 - With only the blower motor running and the evaporator
coil dry, observe the manometer reading. Adjust blow­
er motor speed to deliver the air desired according to
the job requirements. For heating speed external static
pressure drop must not be more than 0.5" W.C. For
cooling speed external static pressure drop must not
be more than 0.8" W.C.
4 - Seal the hole when the check is complete.

EXTERNAL STATIC PRESSURE

Supply Duct Static
Return Duct Static +
Total Duct Static =
(dry coil)
Supply Air
Return Air
FIGURE 22
D-Blower Speed Taps
Blower speed tap changes are made on the integrated con­
trol. See figure 3. The heating tap is connected to the
"HEAT" terminal and the cooling tap is connected to the
"COOL" terminal. The continuous blower tap is connected
to the "FAN" terminal. Unused taps must be secured on
dummy terminals labeled "PARK. To change out existing
speed tap, turn off power and switch out speed tap with tap
connected to "PARK". See blower speed tap table on unit
diagram for motor tap colors for each speed.
High
Low
or
+
-