Reznor X - 10.2.3 Cleaning Pilot and Main Burners; 10.2.4 Cleaning the Heat Exchanger

Form I-X, P/N 150491 R7, Page 25
4) If the manometer does not indicate gas pressure, slowly open the eld-installed
manual gas valve. After the manometer's indicated gas pressure has reached
equilibrium, close the manual shutoff valve. Observe the gas pressure. There
should be no loss of gas pressure on the manometer. If the manometer indicates
a loss of pressure, replace the combination gas valve before placing the heater in
operation.
In the event the pilot ame is short and/or yellow, check the pilot orice for blockage
caused by lint or dust accumulation. Remove the pilot orice and clean with air pres-
sure. DO NOT REAM THE ORIFICE. Check and clean the aeration slot in the pilot
burner.
Clean the metal sensing probe and the pilot hood with an emery cloth and wipe off the
ceramic insulator. Check the spark gap; spark gap should be maintained to 7/64". After
the pilot is cleaned, blow any dirt away with compressed air. (See ignition requirements
in Paragraph 8.5.)
Clean main burners and burner orices using air pressure. Use an air nozzle to blow
out scale and dust accumulation from the burner ports. Alternately blow through the
burner ports and the venturi. Use a ne wire to dislodge any stubborn particles from the
burner ports. Do not use anything that might change the port size.
Clean the burner rack carryover systems with air pressure.
10.2.3 Cleaning Pilot
and Main Burners
10.2.4 Cleaning the
Heat Exchanger
Outer Surfaces - To clean the outer surfaces (circulating air side) of the heat exchanger,
gain access by removing the inspection panels in the ductwork or remove the duct-
work.
There are bafes between the heat exchanger tubes as shown in FIGURE 25. (NOTE:
If the heater has been converted to high CFM (see APPENDIX, page 28, and Label
on the unit), these bafes will have already been removed.) To clean the outside of the
tubes and the bafes, remove each bafe individually. Remove the screws marked "A"
in FIGURE 29, and slide each bafe forward. Use a brush and/or an air hose to remove
accumulated dust and grease deposits from the heat exchanger tubes and the bafes.
Re-install the bafes by sliding them into the rear slot and replacing the screw.
10.2.2 Burner Rack
Removal Instructions
1. Turn off the gas supply.
2. Turn off the electric supply.
3. Remove control access side panel.
4. Disconnect the pilot tubing & thermocouple or ame sensor lead.
5. Mark and disconnect electric valve leads.
6. Uncouple the union in the gas supply.
7. Remove sheetmetal screws in the top corners of the burner rack assembly.
8. Pull "drawer-type" burner rack out of the furnace.
To disassemble the burner rack:
1. Remove Carryover System --
Natural Gas - remove the ash carryover system from the "manifold end" of the
burner rack.
Propane - break the lighter tube connection at the regulator and remove the lighter
tube orice supply tubing; remove the retaining screws in the drip shield and the
shield; remove the retaining screws and slide out the lighter tube.
2. Pull main burners horizontally away from injection opening and lift out.
3. Remove manifold bracket screws and remove manifold.
4. Remove main burner orices.
5. Remove screws and lift out pilot burner.
Follow the instructions in Paragraph 10.2.3 to clean. To re-assemble and replace,
reverse the above procedures being careful not to create any unsafe conditions.