Lennox iComfort SL280UH070V36A Manual page 43

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.
SL280UHV(X) 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 or 18.
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.
WHITE RODGERS GAS VALVE
MANIFOLD
INLET PRESSURE POST
PRESSURE TAP
GAS VALVE SHOWN IN ON POSITION
FIGURE 17
HIGH FIRE ADJUSTMENT
SCREW
(under cap)
Page 43
HONEYWELL GAS VALVE
INLET PRESSURE TAP
ON SIDE
GAS VALVE SHOWN IN ON POSITION
FIGURE 18
8 - Move switch on gas valve to ON. Do not force. See fig­
ure 17 or 18.
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
formed.
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
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?
9 - Is the unit ignition system in lock out? If the unit locks out
again, call the service technician to inspect the unit for
blockages.
10 -Is pressure switch closed? Obstructed flue will cause
unit to shut off at pressure switch. Check flue and outlet
for blockages.
11 -Are flame rollout switches tripped? If flame rollout
switches are tripped, call the service technician for in­
spection.
C-Safety or Emergency Shutdown
Turn off unit power. Close manual and main gas valves.
HIGH FIRE
ADJUSTING SCREW
(under cap)
MANIFOLD
PRESSURE
TAP ON
SIDE