21
4. The primary heat exchanger tubes can be cleaned
using a round wire brush attached to a length of high
grade stainless steel cable, such as drain cleanout
cable. Attach a variable speed reversible drill to the
other end of the spring cable. Slowly rotate the cable
with the drill and insert it into one of the primary heat
exchanger tubes. While reversing the drill, work the
cable in and out several times to obtain sufficient
cleaning. Use a large cable for the large tube, and
then repeat the operation with a small cable for the
smaller tube. Repeat for each tube.
5. When all heat exchanger tubes have been cleaned,
replace the parts in the reverse order in which they
were removed.
6. To reduce the chances of repeated fouling of the
heat exchanger, perform the steps listed in “Startup,
Adjustments, and Checks”.
Burners
WARNING
To avoid personal injury or death due to electric shock, do
not remove any internal compartment covers or attempt
any adjustment. Contact a qualified servicer at once if an
abnormal flame should develop.
The Ultra low NOx models are equipped with premix
burner. The burner box is sealed to achieve safe and
reliable operation. The burner box should not have any
blockage near the air-gas mixer inlet.
CAUTION
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dangerous
operation.
CAUTION
Always verify proper operation after servicing.
For further information on the yearly inspection, consult the
User Manual. It is recommended that a qualified servicer
inspect and service the unit at least once each year.
Turn the unit on at the thermostat. Wait a few minutes,
since any dislodged dust will alter the normal flame
appearance. Flames should be predominantly blue and
directed into the tubes. They should not be yellow. They
should extend directly outward from the burner ports
without curling downward, floating or lifting off the ports.
ACCESSORIES AND FUNCTIONAL PARTS
Sheet Metal Accessories
Additional accessories can be purchased to fit specific
application needs. Parts and instructions are available from
your distributor.
Functional Parts
FUNCTIONAL PARTS
Auxiliary Limit Switch
Gas Orifice
Blower Housing
Gas Valve
Blower/Collector Box Gasket
Gas Manifold
Blower Wheel
Heat Exchanger
Burner Box
High Limit Switch
Burner Box Gasket
High Pressure Switch
Burner Temperature Switch
ID Plug
Capacitor
Igniter
Circulator Blower Motor
Ignition Control
Compressor
Induced Draft Blower
Condenser Coil
Pressure Sensor
Condenser Fan Blade
Pressure Sensor Hose
Condenser Fan Motor
Spark Igniter Module
Contactor
Thermostatic Expansion Valve
ECM Interface Module
Transformer
Evaporator Coil
Time Delay Relay
Flame Sensor
Low Pressure Switch
General Information
1. Refer to the description in Functional Parts List when
ordering any of the listed functional parts. Be sure to
provide the unit model and serial numbers with the
order.
2. Although only functional parts are shown, all sheet
metal parts, doors, etc. may be ordered by description.
3. Parts are available from your distributor.
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