Reznor CAUA Users Manual - Manual (Page 6)

Form O-CAUA, Page 6
CAUTION: Due to high voltage on the spark wire and electrode, do not
touch when energized. See Hazard Levels, Page 2.
Flame Sensor - On the left side of the burner rack, locate the flame sensor. Disconnect
the wire; remove the screw and the flame sensor. Clean with an emery cloth.
Ignition Control - The integrated ignition control module monitors the operation of the
heater including ignition. Do not attempt to disassemble the ignition control module.
However, each heating season the lead wires should be checked for insulation dete-
rioration and good connections.
Proper operation of the direct spark ignition system requires a minimum flame
signal of 1.0 microamps as measured by a microampmeter.
E
To clean the outer surfaces (circulating air side) of the heat exchanger, gain
access by removing the inspection panels in the ductwork or removing the ductwork.
Use a brush and/or an air hose to remove accumulated dust and grease deposits.
The inner surfaces of the heat exchanger can be reached for cleaning with the burner,
turbulators and venter assembly removed. Follow instructions in Paragraph 2.2.4 to
remove the burner (See FIGURE 3).
Remove the turbulators (Turbulators are the metal strips inside the heat exchanger
tubes). Clean the inside of the tubes with a long furnace brush or a heavy wire to which
steel wool has been attached. Brush inside each heat exchanger tube until all foreign
material is removed. A flashlight is helpful in examining the inside of the tubes. Clean
turbulator strips, slide into end of tubes, and re-attach using the screws removed.
If operating with natural gas, there should be no soot deposits. For operation with pro-
pane gas, if sooting exists, check for improper gas manifold pressure and for obstruc-
tions in the vent.
If the unit is installed as a power vent (drawing combustion air from inside the building)
and dirt is found in the tubes indicating a dirty environment, installation of a separated
combustion/venting system should be considered.
R
Remove dirt and grease from the motor housing. The venter motor is permanently
lubricated; do not lubricate. Carefully clean the venter wheel assembly, being cautious
not to bend the wheel.
S R
Check at least once a year. Inspection should include all joints, seams, and
the terminal caps. Clean any screens and grills. Replace any defective parts.
2.0 Maintenance
(cont'd)
2.2 Maintenance
Procedures
(cont'd)
2.2.5 Ignition System
(cont'd)
2.2.6 Cleaning
the Heat Exchanger
CAUTION: Eye
protection is
recommended.
2.2.7 Venter Motor and
Wheel
2.2.8 Vent or Vent/
Combustion Air System
2.2.9 Condensate Drain
E R
If the installation has condensate drains (burner, cooling coil, and/or flue
wrapper). Clean or replace parts as needed. Fill traps.
3.0 SERVICE - Control Location, Operation, and Service
WARNING
Service work on this heater should only be done by a qualified gas service technician. The service
information and the troubleshooting guides are intended as an aid to a qualified service technician
WARNING
Should overheating occur, or the gas supply fail to shut off, turn off the manual gas valve to the
appliance before shutting off the electrical supply.
WARNING
Do not use this appliance if any part has been under water. Immediately call a qualified service
technician to inspect the appliance and replace any gas control which has been under water.
WARNING
I f you turn off the power supply, turn off the gas. See Hazard Levels, Page 2.