Unit Start-Up - Lennox DAVE SIGNATURE SL297UHNV Installation Instructions Manual

Unit Start-Up

FOR YOUR SAFETY READ BEFORE OPERATING
WARNING
Do not use this furnace if any part has been underwater.
A flood-damaged furnace is extremely dangerous.
Attempts to use the furnace can result in fire or explosion.
Immediately call a qualified service technician to inspect
the furnace and to replace all gas controls, control
system parts, and electrical parts that have been wet or
to replace the furnace if deemed necessary.
WARNING
Danger of explosion. Can cause injury or
product or property damage. If overheating
occurs or if gas supply fails to shut off, shut
off the manual gas valve to the appliance
before shutting off electrical supply.
CAUTION
Before attempting to perform any service or maintenance,
turn the electrical power to unit OFF at disconnect switch.
BEFORE LIGHTING the unit, smell all around the furnace
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 on the SL297UHNV is equipped with a gas
control switch (lever). Use only your hand to move switch.
Never use tools. If the the switch will not move by hand,
do not try to repair it. Force or attempted repair may result
in a fire or explosion.
Placing the furnace into operation: SL297UHNV units
are equipped with an automatic hot surface ignition sys-
tem. Do not attempt to manually light burners on this fur-
nace. Each time the thermostat calls for heat, the burners
will automatically light. The ignitor does not get hot when
there is no call for heat on these units.
Priming Condensate Trap: The condensate trap should
be primed with water prior to start-up to ensure proper
condensate drainage. Either pour 10 fl. oz. (300 ml) of
water into the trap, or follow these steps to prime the trap:
1 - Follow the lighting instructions to place the unit into
operation.
2 - Set the thermostat to initiate a heating demand.
3 - Allow the burners to fire for approximately 3 minutes.
4 - Adjust the thermostat to deactivate the heating
demand.
5 - Wait for the combustion air inducer to stop. Set the
thermostat to initiate a heating demand and again
allow the burners to fire for approximately 3 minutes.
6 - Adjust the thermostat to deactivate the heating
demand and wait for the combustion air inducer to
stop. At this point, the trap should be primed with
sufficient water to ensure proper condensate drain
operation.
If you do not follow these instructions exactly, a fire or
explosion may result causing property damage, personal
injury or death.
Gas Valve Operation (Figure 50)
1 - STOP! Read the safety information at the beginning
of this section.
2 - Set the thermostat to the lowest setting.
3 - Turn off all electrical power to the unit.
4 - This furnace is equipped with an ignition device
which automatically lights the burners. Do not try to
light the burners by hand.
5 - Remove the access panel.
6 - Move gas valve switch to OFF. See figure 50.
7 - Wait five 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.
8 - Move gas valve switch to ON. See figure 50.
NEGATIVE AIR
PRESSURE PORT
INLET
SUPPLY
PRESSURE
TAP
GAS VALVE SHOWN IN THE ON POSITION
9 - Replace the access panel.
10- Turn on all electrical power to to the unit.
11- Set the thermostat to desired setting.
NOTE - When unit is initially started, steps 1 through
11 may need to be repeated to purge air from gas
line.
12- If the appliance will not operate, follow the
instructions"Turning Off Gas to Unit" and call your
service technician or gas supplier.
Turning Off Gas to Unit
1 - Set the thermostat to the lowest setting.
2 - Turn off all electrical power to the unit if service is to
be performed.
3 - Remove the access panel.
4 - Move gas valve switch to OFF.
5 - Replace the access panel.
Page 47
WARNING
GAS VALVE
POSITIVE AIR
PRESSURE PORT
MANIFOLD
PRESSURE TAP
FIGURE 50
OUTLET