Lennox International Inc. TUA125S User Manual
Page14
START-UP AND OPERATION
Unit Start-Up
FOR YOUR SAFETY READ BEFORE LIGHTING
Electric shock hazard. Can cause
injury
or death. Do not use this heater if
any
part has been under water.
Immediately
call a qualified service technician to in-
spect the furnace and to replace any part
of the control system and any gas con-
trol which has been under water.
spect the furnace and to replace any part
of the control system and any gas con-
trol 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
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
electri-
cal 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
!
Danger of explosion and fire. Can
cause
injury or product or property
damage. You
must follow these instructions exactly.
WARNING
!
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.
for gas. Be sure to smell next to the floor because some
gas is heavier than air and will settle on the floor.
Use only your hand to push in or turn the gas control
knob. Never use tools. If 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.
knob. Never use tools. If 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.
These unit heaters are equipped with an automatic
spark ignition system. There is no pilot. In case of a
safety shutdown, move thermostat switch to OFF, then
return the thermostat switch to HEAT position.
spark ignition system. There is no pilot. In case of a
safety shutdown, move thermostat switch to OFF, then
return the thermostat switch to HEAT position.
Operation for Honeywell VR8205 Series Gas Valve
(Figure 11)
(Figure 11)
1- STOP! Read the safety information at the beginning
of this section.
2- Set thermostat to lowest setting.
1
HONEYWELL VR8205 SERIES GAS VALVE
GAS VALVE SHOWN IN OFF POSITION
MANI-
FOLD
PRESS-
URE
TAP
FOLD
PRESS-
URE
TAP
ON
OFF
FIGURE 11
MANIFOLD PRESSURE ADJUSTMENT SCREW
INLET
PRESSURE
TAP
PRESSURE
TAP
3- Turn off all electrical power to appliance.
4- This appliance is equipped with an ignition device
4- This appliance is equipped with an ignition device
which automatically lights burners. DO NOT
attempt to light the burners manually.
attempt to light the burners manually.
5- Turn the manual knob on gas valve clockwise to
OFF. Do not force.
6- Wait five (5) minutes to clear out any gas. If you
then smell gas, STOP! Immediately call your
gas supplier from a neighbor's phone. Follow the
gas supplier's instructions. If you do not smell
gas, go to next step.
gas supplier from a neighbor's phone. Follow the
gas supplier's instructions. If you do not smell
gas, go to next step.
7- Turn manual knob on gas valve counterclockwise
to ON.
8- Close the unit door.
9- Turn on all electric power to unit.
10- Set thermostat to desired setting.
11- The combustion air blower will start. The burners
9- Turn on all electric power to unit.
10- Set thermostat to desired setting.
11- The combustion air blower will start. The burners
will light within 40 seconds.
12- If unit does not light first time (gas line not fully
purged) it will attempt up to two more ignitions
before locking out.
before locking out.
13- If lockout occurs, repeat steps 1 through 10.
14- If appliance still will not operate, follow the
14- If appliance still will not operate, follow the
instructions “To Turn Off Gas to Unit" and call
your service technician or gas supplier.
your service technician or gas supplier.