FAN-OFFTIMEADJUSTMENT
60sec. 90sec. 120sec. 180sec.
To adjust fan-off timing,flip dip switch to desired setting,
FIGURE 25
Temperature Rise
Check the temperature rise and, if necessary,adjust the
blower speed to maintainthe temperature rise withinthe
rangeshown on the unit ratingplate.
Thermostat Heat Anticipation
Set the thermostatheat anticipation:
0,50 amps White Rodgers gasvalves
0.70 amps Honeywellgas valves
Electrical
1 - Check all wiring for loose connections.
2 - Check for the correctvoltageat thefurnace (furnace
operating).
3 - Check amp-drawon the blowermotor.
Motor Nameplate Actual
Blower Speeds
NOTE - CFM readingsare takenexternaltounit with a dry
evaporatorcoiland withoutaccessories.
1 - Turn off electricalpower tofurnace.
2 - Remove unitaccess panel.
3 - Disconnectexistingspeedtap at control board speed
terminal.
NOTE - TERMINATION OF ANY UNUSED MOTOR
LEADS MUST BE INSULATED.
4 - Referto blower speedselectionchartonunitwidngdia-
gramfor desiredheatingor coolingspeed.
5 - Connect selected speed tap at control board speed
terminal.
6 - Resecure unitaccess panel.
7 - Turn on electricalpower tofurnace.
Electronic Ignition
The SureLightTM integratedcontrolhasan addedfeatureof
an internalwatchguardcontrol.Thefeatureservesasan au-
tomaticresetdevicefor ignitioncontrolslocked-outbecause
theburnerhasfailed to lighLThistype ofnuisancelockoutis
usuallyattributedto lowgas linepressure.Afterone hourof
continuousthermostatdemandforheat,the watchguardwill
break and remake thermostat demand to the furnaceand
automaticallyreset the controlto relightthe furnace.
Flue And Chimney
1 - Checkfluepipe,chimneyandall connections for tight-
ness and tomake sure there is no blockage.
2 - Check unit forproper draft.
3 - Is pressureswitchclosed?Obstructed flue wi]]cause
unittoshutoffat pressure switch.Check flue and out-
letfor blockages.
4 - Reset manualflame rollout switches on burner box
cover.
Burner Flame Adjustment
The G24M burner flame is not adjustable; however, the
flame shouldbe inspectedat thebeginning of eachheating
season.If necessary,clean the burners.The burnerflame
shouldbe blue when burning naturalgas, and blue/yellow
when burningpropanegas. See figure 26.
Burner Flame
FLAME APPEARS BLUE IF
BURNING NAT. GAS; BLUE/
YELLOW FOR PROPANE,
-- VEST
PANEL
FIGURE 26
Turbulator
G24M(X) sedes unitsincludea ceramic fiber turbulator in
each heat exchanger inlet. The turbulators lower nitrogen
oxide emissions.Prior to unit start-up, inspect the turbula*
tors for shipping damage. The turbulators are fragile; they
should be removed only if it is necessary to replace them.
Failure To Operate
Ifthe unitfails to operate,checkthe following:
1 - Is the thermostatcallingfor heat?
2 - Are access panelssecurely in place?
3 - Is the main disconnectswitchclosed?
4 - Is there a blownfuse?
5- Isthe flltardirtyer plugged?Dirtyor ptuggedfilterswill
cause the limit controlto shutthe unitoff.
6 - Is gas turnedonat the meter?.
7 - Is the manualmainshut-offvalve open?
8 - Is the internalmanual shut--offvalveopen?
9 - Is the unitignitionsystem in lockout? If the unitlocks
outagain, call the servicetechnician to inspecttheunit
for blockages.
Page26
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