Gas Heat Start-Up - Lennox LHT/LDT024 Installation Instructions Manual

Gas Heat Start-Up (LDT Units)
FOR YOUR SAFETY READ BEFORE LIGHTING
WARNING
Electric shock hazard. Can cause injury
or death. Do not use this unit if any part
has been under water. Immediately call
a qualified service technician to inspect
the unit and to replace any part of the
control system and any gas control
which has been under water.
WARNING
Danger of explosion. Can cause injury
or product or property damage. If over­
heating occurs or if gas supply fails to
shut off, shut off the manual gas valve
to the appliance before shutting off
electrical supply.
WARNING
Electric shock hazard. Can cause
injury or death. Before attempting to
perform any service or maintenance,
turn the electrical power to unit OFF at
disconnect switch(es). Unit may have
multiple power supplies.
WARNING
SMOKE POTENTIAL
The heat exchanger in this unit could be a source of
smoke on initial firing. Take precautions with re­
spect to building occupants and property. Vent ini­
tial supply air outside when possible.
BEFORE LIGHTING smell all around the appliance area
for gas. Be sure to smell next to the floor because some
gas is heavier than air and will settle on the floor.
The gas valve may be equipped with either a gas control
lever or gas control knob. Use only your hand to push
the lever or turn the gas control knob. Never use tools. If
the the lever will not move or the knob will not push in or
turn by hand, do not try to repair it. Call a qualified
service technician. Force or attempted repair may
result in a fire or explosion.
WARNING
Danger of explosion. Can cause injury or
death. Do not attempt to light manually.
Unit has a direct spark ignition system.
This unit is equipped with an automatic spark ignition
system. There is no pilot. In case of a safety shutdown,
move thermostat switch to OFF and return the thermostat
switch to HEAT to reset ignition control.
A-Placing Unit In Operation
Danger of explosion and fire. Can cause
injury or product or property damage.
You must follow these instructions
exactly.
Gas Valve Operation (figure 23)
1- Set thermostat to lowest setting.
2- Turn off all electrical power to appliance.
3- This appliance is equipped with an ignition device
which automatically lights the burner. Do not try to
light the burner by hand.
4- Open or remove the control access panel.
WHITE RODGERS 36J54 GAS VALVE
INLET
PRESSURE
TAP
Gas valve switch is shown in OFF position.
5- Move gas valve switch to OFF. See figure 23.
6- Wait five (5) minutes to clear out any gas. If you then
smell gas,
gas supplier from a neighbor's phone. Follow the gas
supplier's instructions. If you do not smell gas, go to
the next step.
7- Move gas valve switch to ON. See figure 23.
8- Close or replace the control access panel.
9- Turn on all electrical power to appliance.
10- Set thermostat to desired setting.
NOTE - When unit is initially started, steps 1 through 9
may need to be repeated to purge air from gas line.
11- The ignition sequence will start.
Page 34
WARNING
Two-Stage
MANIFOLD HIGH FIRE
ADJUSTMENT
PRESSURE TAP
LOW FIRE
ADJUSTMENT
FIGURE 23
STOP! Immediately
LHT/LDT024, 036, 048, 060
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