Placement; Start-Up; Heating System Service Checks - Lennox SL280DF060NV36B Instruction Manual

II-PLACEMENT AND INSTALLATION
Make sure unit is installed in accordance with installation
instructions and applicable codes.
III-START‐UP
A-Preliminary and Seasonal Checks
1 - Inspect electrical wiring, both field and factory installed
for loose connections. Tighten as required.
2 - Check voltage at disconnect switch. Voltage must be
within range listed on the nameplate. If not, consult the
power company and have voltage condition corrected
before starting unit.
B-Heating Start‐Up
WARNING
Shock and burn hazard.
SL280DFNV units are equipped with a hot surface
ignition system. Do not attempt to light manually.
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 - Turn switch on gas valve to OFF. Do not force. See
figure 17.
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 instruc­
tions. If you do not smell gas go to next step.
GAS VALVE
NEGATIVE AIR
PRESSURE PORT
INLET
SUPPLY
PRESSURE
TAP
GAS VALVE SHOWN IN THE ON POSITION
FIGURE 17
8 - Move switch on gas valve to ON. Do not force. See fig­
ure 17.
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.
Turning Off Gas To Unit
1 - Set thermostat to lowest setting.
2 - Turn off all electrical power to unit if service is to be per­
3 - Remove access panel.
4 - Move switch on valve to OFF. Do not force.
5 - Replace 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
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?
9 - Is the unit ignition system in lock out? If the unit locks out
10 -Is pressure switch closed? Obstructed flue will cause
11 -Are flame rollout switches tripped? If flame rollout
C-Safety or Emergency Shutdown
Turn off unit power. Close manual and main gas valves.
D-Extended Period Shutdown
Turn off thermostat or set to "UNOCCUPIED" mode. Close
all gas valves (both internal and external to unit) to guaran­
tee no gas leak into combustion chamber. Turn off power to
unit. All access panels and covers must be in place and se­
POSITIVE AIR
cured.
PRESSURE PORT
IV-HEATING SYSTEM SERVICE CHECKS
A-CSA Certification
All units are CSA design certified without modifications.
Refer to the SL280DFNV Installation Instruction.
OUTLET B-Gas Piping
MANIFOLD
If a flexible gas connector is required or allowed by
PRESSURE TAP
the authority that has jurisdiction, black iron pipe
shall be installed at the gas valve and extend outside
the furnace cabinet.
Do not over torque (800 in-lbs) or under torque (350
in-lbs) when attaching the gas piping to the gas
valve.
Page 28
formed.
cause the limit control to shut the unit off.
again, call the service technician to inspect the unit for
blockages.
unit to shut off at pressure switch. Check flue and outlet
for blockages.
switches are tripped, call the service technician for in­
spection.
CAUTION
WARNING