Unit Start-Up - Lennox SIGNATURE SLP99DFV 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. Should the gas
supply fail to shut off or if overheating occurs,
shut off the gas valve to the furnace before
shutting off the electrical supply.
CAUTION
Before attempting to perform any service or maintenance,
turn the electrical power to unit OFF at disconnect switch.
WARNING
During blower operation, the ECM motor emits
energy that may interfere with pacemaker operation.
Interference is reduced by both the sheet metal cabinet
and distance.
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 again 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.
BEFORE BEFORE PLACING THE UNIT INTO OPERA-
TION, 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
SLP99DFV is equipped with a gas control switch. Use only
your hand to move the control switch. Never use tools. If
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:
SLP99DFV units are equipped with an automatic ignition
system. Do not attempt to manually light burners on this
furnace. Each time the thermostat calls for heat, the burn-
ers will automatically light. The ignitor does not get hot
when there is no call for heat on units with this ignition
system.
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 51)
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 the gas valve switch to the OFF position. See
FIGURE 51.
7 - Wait five minutes to clear out any gas. If you then
smell gas, STOP! Immediately call the 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 the ON position. See
FIGURE 51. Do not force.
NEGATIVE AIR
PRESSURE PORT
INLET
SUPPLY
PRESSURE
TAP
GAS VALVE SHOWN IN THE ON POSITION
Page 50
WARNING
GAS VALVE
POSITIVE AIR
PRESSURE PORT
MANIFOLD
PRESSURE TAP
FIGURE 51
OUTLET