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5 - After 10 seconds, the gas valve closes and steps 4
and 5 will repeat two additional times before locking
out the gas valve, which will be indicated by two
flashes on the LED.
6 - To restart the system, de-energize the thermostat call
for heat and follow the operating instructions under
“Unit Start-Up and Operation.“
REPAIR PARTS
When ordering repair parts, include the complete unit model number listed on the unit rating plate. For exam-
ple: LS25-125A-1. Contact the installing dealer, or visit www.lennox.com or call 1-800-9LENNOX for a list of
the Lennox dealers in the area. Include manufacturer’s or distributor’s name and address. It is a requirement
in the Z83.8 standard.
Electrical Connections Tight?
START-UP AND PERFORMANCE CHECKLIST
Job No.:
City:
City:
Serial No.:
Date:
State/Province:
Service Technician:
Air Shutters Properly Adjusted (If Installed)?
Flue Connections Tight?
THERMOSTAT
Calibrated?
Heat Anticipator Properly Set?
Level?
Manifold Pressure
Blower Motor Amps
Blower Motor Lubrication O.K.?
Gas Piping Connections Tight & Leak-Tested?
State/Province:
Fan Timer Operation Checked?
w.c.
Job Name:
Job Location:
Installer:
Unit Model No.:
Supply Voltage
Furnace Btu Input
Line Pressure
FAILURE TO OPERATE
If unit fails to operate check the following:
1 - Is thermostat calling for heat?
2 - Is main disconnect closed?
3 - Is there a breaker tripped or a fuse blown?
4 - Is gas turned on at meter?
5 - Is manual shutoff valve open?
6 - Is unit ignition system in lock out? If unit locks out
again, call service technician to inspect unit.
7 - Is pressure switch closed? Obstructed flue will
cause unit to shut off at pressure switch. Check flue
passage and outlet.
SAFETY SHUT-OFF VALVE TEST
The safety shut-off valve test procedure is as follows:
1 -
Turn off the manual gas valve.
2 - Set the thermostat to call for heat.
3 - System begins normal sequence of operation.
4 - After approximately 30 seconds (pre purge period)
the LED will fast flash indicating the gas valve is
powered.
FLUE PASSAGEWAY AND FLUE BOX
The flue passages and flue box should be inspected and
cleaned prior to each heating season. The sequence of
operation should be as follows:
1 -
Turn off both electrical and gas supply to unit.
2 - Disconnect combustion air inducer wiring.
3 - Remove combustion air inducer assembly. Remove
flue box. If necessary, remove inducer assembly
from flue box. Clean flue box with wire brush.
4 - Remove burners as described in “Burners” section.
5 - Clean tubes with a wire brush.
6 - Reassemble unit. The combustion air and flue box
gaskets should also be replaced during reassembly.
7 - Restore electrical power and gas supply. Follow
lighting instructions to light unit. Check operation of
unit.
COMBUSTION AIR INDUCER
Under normal operating conditions, the combustion air in-
ducer should be checked and cleaned prior to the heating
season with the power supply disconnected. Use a small
brush to clean inducer wheel.
ELECTRICAL
1 - Check all wiring for loose connections.
2 - Check for correct voltage at unit (unit operating).
3 - Check amperage draw.
FLUE AND CHIMNEY
Check all vent and vent connector joints for tightness. En-
sure that connections are sealed and that there are no
blockages.
Summary of Contents for LS25 Series
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