Typical Operating Characteristics; Blower Operation And Adjustment; External Static Pressure; Temperature Rise - Lennox EL296UH045XE36B Unit Information

V-TYPICAL OPERATING CHARACTERISTICS
A-Blower Operation and Adjustment
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 posi­
tion, 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 54)
Temperature rise for EL296UHE 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 = ________
FIGURE 54
C-External Static Pressure
1 - Tap locations shown in figure 55.
2 - Punch a 1/4" diameter hole in supply and return air ple­
3 - With only the blower motor running and the evaporator
4 - Seal the hole when the check is complete.
_
_____
SUPPLY
AIR
Temperature
s
RETURN AIR
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nums. Insert manometer hose flush with inside edge of
hole or insulation. Seal around the hose with perma­
gum. Connect the zero end of the manometer to the
discharge (supply) side of the system. On ducted sys­
tems, connect the other end of manometer to the return
duct as above.
coil dry, observe the manometer reading. Adjust blow­
er motor speed to deliver the air desired according to
the job requirements. For heating speed (second
stage heat speed) external static pressure drop must
not be more than 0.5" W.C. For cooling speed (second
stage cool speed) external static pressure drop must
not be more than 0.5" W.C.

EXTERNAL STATIC PRESSURE

Supply Duct Static ________
Return Duct Static + _____
Total Duct Static = ________ (dry coil)
Supply Air
Return Air
FIGURE 55
Duct Static
or