Condensate Line Raised by Base
25-20-52
8. Checks and Adjustments
Startup
NOTE: Refer to the start-up procedures in the "User's Informa-
tion Manual" or to the "Operating Instructions Label" on the fur-
nace.
CAUTION
If any sparks, odors or unusual noises occur,
immediately shut OFF power to furnace. Check for
wiring errors or obstruction to blower.
4. For altitudes up to 2000', set pressure to value shown in
Table 6, _+0.3" (8mm) water column. For altitudes of 2000'
to 8000', see Section 5 for correct pressure setting.
Adjust Pilot Burner
The furnace has a pilot flame to light the main burner. The flame
should surround 3/8"to t/2" ofthe flame sensor. See Figure 39. To
adjust, remove cap from pilot adjusting screw on gas valve. Turn
screw counterclockwise to increase or clockwise to decrease
flame as required. Replace adjusting screw cap.
GasSupply Pressure
Gas supply pressure should be within minimum and maximum
values listed on rating plate. Pressures are usually set by gas sup-
pliers.
ManifoldGas PressureAdjustment
NOTE: Make adjustment to manifold pressure with burners oper-
ating.
Fire or explosion hazard.
Turn OFF gas at shut off before connecting
manometer.
Failure to turn OFF gas at shut off before
connecting manometer can result in death,
personal injury and/or property damage.
1. Remove the burner compartment door.
2. With gas OFE connect manometer to tapped opening on
gas valve. Use manometer with a 0 to 15" water column
range.
3. Turn gas ON and remove adjustment screw cover on gas
valve. Turn counterclockwise to decrease pressure and
clockwise to increase.
Pilot Burner
Proper Flame _ Flame Sensor
Adjustment _
3/8" to 1/2" /_
_ / _"_ Hot Surface
nte
10-11-65
MainBurnerFlameCheck
Allow the furnace to run approximately 10 minutes then inspect
the main burner and pilot flames. See Figure 40.
Check for the following (Figure 40):
• Stable and blue flames. Dust may cause orange tips or
wisps of yellow, but flames MUST NOT have solid, yel-
low tips.
• Flames extending directly from burner into heat ex-
changer.
• Flames do NOT touch sides of heat exchanger.
If any problems with main burner flames are noted, it may be nec-
essary to adjust gas pressures, or check for drafts.
44001 101004 [_
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