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C-Supply Air Blower
1 - Check and clean blower wheel.
2 - Motors used on the Lennox ML180DF series units
are permanently lubricated and need no further lu
brication.
D-Flue and Chimney
Flue must conform to local codes. In the absence of local
codes, flue must meet the National Fuel Gas Code
ANSI-Z223.1 venting requirements. Flue pipe deteriorates
from the inside out and must be disconnected in order to
check thoroughly. Check flue pipe, chimney and all con
nections for tightness and to make sure there is no block
age or leaks.
E-Electrical
1 - Check all wiring for loose connections.
2 - Check for the correct voltage at the furnace (furnace
operating). Correct voltage is 120VAC +
10%
3 - Check amp-draw using a true RMS meter on the blow
er motor with blower access panel in place. See figure
19.
Furnace Nameplate__________Actual__________
FIGURE 19
kVAr
kWh
COMM
V3
V1
V2
P
OFF
MR
EX
−
1
W
3
2
Check Motor AMP Draw
(upflow furnace shown)
True RMS Meter
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