Unit Start-Up - Lennox SL280DFNV Installation Instructions Manual

Unit Start-Up

WARNING
Do not use this furnace if any part has been
underwater. Immediately call a licensed professional
service technician (or equivalent) to inspect the
furnace and to replace any part of the control system
and any gas control which has been under water.
WARNING
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.
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.
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 on the SL280DFNV unit will be equipped
with either a gas control switch. Use only your hand to
move the control switch. Never use tools. If the switch will
not turn or 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:
SL280DFNV units are equipped with an automatic igni-
tion system. Do not attempt to manually light burners on
these furnaces. 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 units with an au-
tomatic ignition system.
WARNING
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 26)
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 switch on gas valve to OFF. Do not force. See
figure 26.
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.
MANIFOLD PRESSURE ADJUSTMENT
(TURN CCW TO INCREASE PRESSURE)
NEGATIVE AIR
PRESSURE PORT
INLET
SUPPLY
PRESSURE
TAP
8 - Move switch on gas valve to ON. Do not force. See
figure 26.
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 upper access panel.
4 - Move switch on gas valve to OF. Do not force. See
figure 26.
5 - Replace the upper access panel.
Failure To Operate
If the unit fails to operate, check the following:
1 - Is the thermostat calling for heat?
2 - Are access panels securely in place?
3 - Is the main disconnect switch closed?
4 - Is there a blown fuse or tripped circuit breaker?
Page 37
GAS VALVE
POSITIVE AIR
PRESSURE PORT
GAS VALVE SHOWN IN THE ON POSITION
FIGURE 26
OUTLET
MANIFOLD
PRESSURE TAP