Lennox SIGNATURE SLP99UH090XV48C - Unit Start-Up; Priming Condensate Trap; Gas Valve Operation (FIGURE 56)

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Unit Start-Up
FOR YOUR SAFETY READ BEFORE OPERATING
WARNING
Do not use this furnace if any part has been underwater.
A ood-damaged furnace is extremely dangerous.
Attempts to use the furnace can result in re or explosion.
Immediately call a qualied 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 o󰀨 or if overheating occurs,
shut o󰀨 the gas valve to the furnace before
shutting o󰀨 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 . 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 re 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 re 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 su󰀩cient water to ensure proper
condensate drain operation.
BEFORE PLACING THE UNIT INTO OPERATION, smell
all around the furnace area for gas. Be sure to smell next
to the oor because some gas is heavier than air and will
settle on the oor. The gas valve on the SLP99UHV 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 attempt-
ed repair may result in a re or explosion.
Placing the furnace into operation:
SLP99UHV 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.
WARNING
If you do not follow these instructions exactly, a re or
explosion may result causing property damage, personal
injury or death.
Gas Valve Operation (FIGURE 56)
1 - STOP! Read the safety information at the beginning
of this section.
2 - Set the thermostat to the lowest setting.
3 - Turn o󰀨 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 56.
7 - Wait ve 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 56. Do not force.
GAS VALVE
NEGATIVE AIR
PRESSURE PORT
POSITIVE AIR
PRESSURE PORT
MANIFOLD
PRESSURE TAP
INLET
OUTLET
SUPPLY
PRESSURE
TAP
GAS VALVE SHOWN IN THE ON POSITION
FIGURE 56