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Installation Instructions
Bosch 96% AFUE Condensing Gas Furnace - BTC 770503101 J (06.2023)
15.5 Ignitor (Qualied Service Technicians Only)
If the ignitor and the surrounding air are at about 70°F and the
ignitor wires are not connected to any other electrical components.
the resistance of the ignitor should not exceed 200 ohms. If it
does? the ignitor should be replaced
15.6 Burners
WARNING: FIRE, EXPLOSION, ELECTRICAL SHOCK OR
CARBON MONOXIDE POISONING HAZARD
f To avoid personal injury or death. Do not remove
any internal compartment covers or attempt any
adjustment. Electrical components are contained in both
compartments. Contact a qualified service agent at once if
an abnormal flame appearance should develop.
Periodically during the heating season， perform a visual check of the burner flames.
Turn the furnace on at the thermostat. Wait a few minutes， since any dislodged
dust will alter the normal flame appearance. Flames should be stable， quiet， soft
and blue with slightly orange tips. They should not be yellow. They should extend
directly outward from the burner ports without curling downward， floating or lifting
off the ports. See Figure 40 (page 48). Contact a qualified service agent at once
if an abnormal flame appearance should develop or the burners have a heavy
accumulation of soot and carbon.
WARNING:
f Only a qualified contractor, installer or service agency can
clean the burners.
15.7 Inspecting the Heat Exchanger (Qualied Service Technicians Only)
NOTICE:
f If the heat exchangers get a heavy accumulation of soot
and carbon, they must be replaced rather than cleaning
them. A heavy build-up of soot and carbon indicates that
a problem exists which needs to be corrected, such as
improper adjustment of manifold pressure, insufficient
or poor quality combustion air, incorrect size or damaged
manifold orifice(s), improper gas, or a restricted heat
exchanger. In these scenarios, the heat exchanger must be
replaced
Inspect the heat exchanger for excessive rust, cracks, or holes. Visual inspection
is always best, but requires training and practice. There are tools (field supplied)
available to assist, such as inspection cameras and dye penetration inspection
systems. Inspect the metal flue for rust or holes, and make sure it’s supported
properly.
15.8 Condensate Drain
f Inspect all condensate drain tubes and condensate trap assembly for
leaks and proper drainage.
15.9 Repair and Replacement Parts
f When ordering any of the listed functional parts, be sure to provide the
furnace model and serial numbers with the order.
f Parts are available from your distributor.
f Flame sensors and ignitors are considered serviceable items.
16 Before Leaving Installation
f Cycle the furnace with the thermostat at least three times. Verify
cooling (if applicable) and fan only operation.
f Review the manual with the homeowner and discuss proper furnace
operation and maintenance.
f Leave literature packet near furnace.
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