Unit Start-Up - Lennox SL280UHNV 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 SL280UHNV unit will be equipped with a gas
control switch. Use only your hand to move the switch.
Never use tools. If the switch will not turn or if the control
switch will not move by hand, do not try to repair it.
Placing the furnace into operation:
SL280UHV 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. The Honeywell gas valve is rated
for ambient temperatures between -40
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.
F and +175 F.
o o
Page 39
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 upper access panel.
6 - Move gas valve switch to OFF position. 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
GAS VALVE SHOWN IN THE ON POSITION
FIgURE 26
8 - Move gas valve switch to ON position. Do not force.
See Figure 26.
9 - Replace the upper access panel.
10 - Turn on all electrical power 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 supplierTurning 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 gas valve switch to OFF position. 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?
5 - Is the filter dirty or plugged? Dirty or plugged filters
will cause the limit control to shut the unit off.
6 - Is gas turned on at the meter?
7 - Is the manual main shut-off valve open?
8 - Is the internal manual shut-off valve open?
GAS VALVE
POSITIVE AIR
PRESSURE PORT
OUTLET
MANIFOLD
PRESSURE TAP