Page 20
Ignition Control LED
The ignition control contains a green LED which indicates
the following:
TABLE 5
IGNITION CONTROL LED
LED UNIT OPERATION
Slow Flash* Normal Operation - No call for heat
Fast F;lash Normal Operation - Call for heat
2 Flashes System lockout - failed to detect or sustain ame
3 Flashes
Pressure switch failed closed before CAI
is energized or failed open after CAI is
energized
4 Flashes High limit (S10) or rollout switch open
5 Flashes Flame sensed and gas valve (GV1) not energized
6 Flashes On-board microprocessor fault.
7 Flashes Pressure switch (S18) closed with inducer o.
8 Flashes Rollout switch (S47/S195) open. Cycle-power to reset.
Steady On Control board (A3) failure
Steady O Internal control board (A3) failture or not power.
High Altitude Adjustments
In Canada, certication for installation at altitudes over
4500 feet (1372m) above sea level is the jurisdiction of
local authorities. Lennox recommends derating 4%/1000
feet above 4,500 feet. Refer to table 6 for natural gas
manifold pressures and the Engineering Handbook for
high altitude kit part numbers.
Units may be red at full input up to 2000 feet. (610m)
above sea level. Above 2000 feet (610m), manifold pres-
sure must be adjusted. Adjust pressure regulator to pres-
sure shown in table 6.
TABLE 6
CANADA - NATURAL GAS MANIFOLD PRESSURES
[inch w.g. (kPa)]
LF25
MODEL
Altitude in Feet (Meters)
0-2000
(0- 610)
2001-
4500
(610-
1372)
4501-
5500
(1372-
1676)
5501-
6500
(1677-
2012)
6501-
7500
(2012-
2286)
7501-
9500
(2286-
2896)
030, 045,
060, 075,
090, 105
3.5
(0.87)
3.3
(0.82)
3.0
(0.75)
2.8
(0.70)
2.5
(0.62)
See Kit
Instruction
125, 150,
175, 200
3.5
(0.87)
3.1
(0.77)
2.8
(0.70)
2.6
(0.65)
See Kit Instruction
250, 300,
350, 400
3.7
(0.92)
3.2
(0.80)
2.9
(0.72)
2.8
(0.70)
2.6
(0.65)
See Kit
Instruction
NOTE - A natural to LP/propane gas changeover kit is
required to convert the unit in the eld. Refer to the in-
stallation instructions supplied with the changeover kit for
conversion procedure.
In the US, units may be red at full input up to 2000 feet
(610m) above sea level. Above 2000 feet (610m), unit
must be de-rated by four percent per 1000 feet for in-
stallation above 2000 feet. The de-rate may be accom-
plished by adjusting the manifold pressure. Refer to table
7 for natural gas manifold pressures and the Engineering
Handbook for high altitude kit part numbers.
TABLE 7
US - NATURAL GAS MANIFOLD PRESSURES
[inch w.g. (kPa)]
LF25
MODEL
Altitude in Feet (Meters)
0-2000
(0- 610)
2001-3000
(610- 914)
3001-4000
(915- 1219
4001-5000
(1220-1524)
5001-10000
(1524-3048)
030, 045,
060, 075,
090, 105
3.5
(0.87)
3.1
(0.77)
2.9
(0.72)
2.6
(0.65)
See Kit
Instruction
125, 150,
175, 200
3.5
(0.87)
2.9
(0.72)
2.7
(0.67)
See Kit Instruction
250, 300,
350, 400
3.7
(0.92)
3.1
(0.77)
2.8
(0.70)
2.6
(0.65)
See Kit
Instruction
In some cases, it is necessary to change the pressure
switch to ensure proper operation at higher altitudes. See
EHB for high altitude pressure switch kits.
The combustion air inducer proving switch is factory set.
No adjustment is necessary.
Gas Flow
To check for proper gas ow to the combustion chamber,
determine the Btu input from the appliance rating plate. Di-
vide this input rating by the Btu per cubic feet of available
gas. Result is the required number of cubic feet per hour.
Determine the ow of gas through the gas meter for two
minutes and multiply by 30 to get the hourly ow of gas.
Gas Pressure Adjustment
1 - Check gas line pressure with unit ring at maximum
rate. A minimum of the following should be
maintained for proper unit operation:
030-105KBTUH - 5” (127mm) w.c. for natural gas
125-400KBTUH - 6” (152mm) w.c. for natural gas
030-105KBTUH - 10.5” (267mm) w.c. for LP/propane gas
125-400KBTUH - 11.0” (279mm) w.c. for LP/propane gas
2 - After line pressure has been checked and adjusted,
check regulator pressure. Correct manifold pressure
is shown on the unit rating plate. See gures 9 and
10 for gas pressure adjustment screw location.
A natural gas to LP/propane gas changeover kit
is required to convert the unit in the eld. Refer to
installation instructions provided with changeover kit
for conversion procedure.
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