Maintenance - Lennox EL180DFE Series Unit Information

TEMPERATURE RISE
Supply Duct Temperature
Return Duct Temperature
Temperature Rise =
Upflow Furnace Shown
Return Air
FIGURE 22
C-External Static Pressure
1 - Tap locations shown in figure 23 .
2 - Punch a 1/4" diameter hole in supply and return air ple­
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.
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.
D-Blower Speed Taps
Blower speed tap changes are made on the integrated con­
trol. See figure NO TAG. 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.
_
Supply Air
EXTERNAL STATIC PRESSURE
Supply Duct Static
Return Duct Static +
Total Duct Static =
(dry coil)
VI-MAINTENANCE
Annual Furnace Maintenance
At the beginning of each heating season, and to comply
with the Lennox Limited Warranty, your system should be
checked by a licensed professional technician (or equiva­
lent) as follows:
1- Check wiring for loose connections, voltage at indoor
unit and amperage of indoor motor
2- Check the condition of the belt and shaft bearings if ap­
plicable.
3- Inspect all gas pipe and connections for leaks
4- Check the cleanliness of filters and change if necessary
(monthly).
Cabinet Width
A (14-1/2")
B (17-1/2")
C (21")
Page 21
Upflow Furnace Shown
Supply Air
High
Low
Return Air
FIGURE 23
.
TABLE 15
Return Air Filter Size (inches)
14 x 25 x 1 (1)
16 x 25 x 1 (1)
20 x 25 x 1 (1)
or
+
-
.