Lennox EL195UHNE Series Manual page 44

E-Proper Combustion
Furnace should operate minimum 15 minutes with correct
manifold pressure and gas flow rate before checking com-
bustion. Take combustion sample beyond the flue outlet
and compare to the tables below.
TABLE 20
EL195
CO % For Nat
Model
2
040 6.3 - 7.8
060 6.5 - 8.2
080 7.2 - 8.4
100 7.3 - 8.5
The maximum carbon monoxide reading should not exceed 100ppm.
F- Proper Ground and Voltage
WARNING
Electric Shock Hazard. Can cause injury
or death. Unit must be properly grounded
in accordance with national and local
codes.
CHECK VOLTAGE BETWEEN LINE NEUTRAL
AND LOW VOLTAGE "C" TERMINAL
Red LED
CO % For LP
2
n/a
8.4 - 9.9
9.0 - 10.4
n/a
Recall
A poorly grounded furnace can contribute to premature
ignitor failure. Use the following procedure to check for
ground and voltage to the integrated control.
1 - Measure the AC voltage between Line Neutral
(spade terminals) and "C" terminal (low voltage
terminal block) on the integrated control. See figure
58. A wide variation in the voltage between Line
Neutral and "C" as a function of load indicates a
poor or partial ground. Compare the readings to the
table below. If the readings exceed the maximum
shown in table 21, make repairs before operating
the furnace.
2 - In addition, measure the AC voltage from Line Hot
to Line Neutral (spade terminals) on the integrated
control. See figure 58. This voltage should be in the
range of 97 to 132 Vac.
Furnace Status
Power On Furnace Idle
CAI / Ignitor Energized
Indoor Blower Energized
CHECK VOLTAGE BETWEEN LINE
HOT AND LINE NEUTRAL
Red LED
Recall
FIGURE 58
Page 44
TABLE 21
Measurement VAC
Expexcted Maximum
0.3
0.75
Less than 2
2
5
10