Lennox EL195DF SERIES User Manual page 38

F− Proper Gas Flow (Approximate)
Gas Flow (Approximate)
TABLE 14
GAS METER CLOCKING CHART
Seconds for One Revolution
Natural
EL195
Unit 1 cu ft
Dial
−045 80
−070 55
−090 41
−110 33
Natural−1000 btu/cu ft
NOTE − To obtain accurate reading, shut off all other gas
appliances connected to meter.
Furnace should operate at least 5 minutes before check-
ing gas flow. Determine time in seconds for two revolu-
tions of gas through the meter. (Two revolutions assures a
more accurate time). Divide by two and compare to time
in table 14. If manifold pressure matches table 13 and rate
is incorrect, check gas orifices for proper size and restric-
tion. Remove temporary gas meter if installed.
Conversion Kit and Pressure Switch Requirements at Varying Altitudes
Natural to
LP/Propane
EL195
Unit
0 − 7500 ft
(0 − 2286m)
−045
−070
*69W73
−090
−110
* Conversion requires installation of a gas valve manifold spring which is provided with the gas conversion kit.
Pressure switch is factory set. No adjustment necessary. All models use the factory−installed pressure switch from 0−4500 feet (0−1370 m).
LP
2 cu ft 1 cu ft 2 cu ft
Dial Dial DIAL
160 200 400
110 136 272
82 102 204
66 82 164
LP−2500 btu/cu ft
High Altitude
Natural Burner
Orifice Kit
7501 − 10,000 ft
(2286 − 3038m)
73W37
G− Proper Combustion
Furnace should operate at least 15 minutes with correct
manifold pressure and gas flow rate before checking com-
bustions. Take sample beyond the flue outlet and
compare to table 15.
EL195
Unit
−045
−070
−090
−110
The maximum carbon monoxide reading should not exceed 50 ppm.
H− High Altitude
NOTE − In Canada, certification for installations at eleva-
tions over 4500 feet (1372 m) is the jurisdiction of local au-
thorities.
EL195DF units require no manifold pressure adjustments
for operation at altitudes up to 10,000 feet (3048 m) above
sea level. Units installed at altitude of 4501 − 10,000 feet
(1373 to 3048m) require a pressure switch change which
can be ordered separately. Table 16 lists conversion kit and
pressure switch requirements at varying altitudes.
The combustion air pressure switch is factory−set and re-
quires no adjustment.
NOTE − A natural to LP/propane gas changeover kit is nec-
essary to convert this unit. Refer to the changeover kit
installation instruction for the conversion procedure.
TABLE 16
High Altitude
LP/Propane
Burner Orifice Kit
7501 − 10,000 ft
(2286 − 3038m)
*68W68
Page 38
TABLE 15
CO % CO
2 For Nat
7.2 − 8.2
High Altitude Pressure Switch
4501 − 7500 ft 7501 −10,000 ft
(1373 − 2286m) (2286 − 3048m)
No Change 80W60
80W66 80W59
80W65 80W59
80W66 80W59
%
2 For LP
8.6 − 9.6