Reznor UDBS Unit Installation Manual - Manual (Page 37)

Form I-UDB, P/N 202658 R14, Page 37
Clean all foreign material from the burner and venturi. After the burner is thoroughly
clean, replace the end cap making certain that it is tight against the burner housing.
NOTE: If any of the burner components are damaged or deteriorated, replace the
burner assembly.
Re-Install the Burner Instructions to Re-Install the Burner (Refer to FIGURE 23)
1. Attach the Burner Assembly - Holding the venturi tube, slide the entire burner
assembly into position. Align the supports on the left side with the slots in the
burner shield; sliding the supports into the slots. On the right, re-attach each
burner body support to the secondary air shield.
2. Attach the Secondary Air Baffles (Sizes 60-400 only) - Re-attach the secondary
air baffles as marked. Baffles may be different sizes and each must be attached in
the correct location.
3. Attach the Control Assembly - Carefully slide the control assembly into position.
Re-attach with the same screws. Check to be sure all wire connections are secure.
4. Attach the Gas Train - Slide the gas train so that the orifice adapter is through
the bracket. Fasten the gas train to the bracket with the locking nut. Install the gas
orifice. Re-connect the wires to the gas valve.
5. Close the access panel.
6. Reconnect the gas supply at the union outside of the cabinet. Leak test the
connection with leak detecting solution.
7. Turn on the electric and the gas. Check for proper operation.
At the burner flame entrance of each tube, shine a bright light into each heat exchanger
section. With the light shining into the heat exchanger, observe the outside for visible
light. Repeat this procedure with each heat exchanger section. If any light is observed,
replace the heat exchanger.
10.2.3 Burner Orifice Burner orifice usually only needs to be replaced when installing a gas conversion kit. If
ordering a replacement orifice only, give BTUH content and specific gravity of gas, as
well as the model and serial number of the unit. When removing or replacing the burner
orifice, be careful not to damage the venturi tube and/or the bracket.
10.2.4 Ignition System DSI Integrated Control Module (circuit board) - See FIGURE 24. The module moni-
tors the operation of the heater including ignition. The only replaceable component is
the 3 amp Type ATC or ATO fuse. If the fuse is blown, the problem is most likely an
external overload. Correct the problem and replace the fuse.
Do not attempt to disassemble the control module. However, each heating season
check the lead wires for insulation deterioration 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.
FIGURE 24 - DSI
Integrated Control
Module (Circuit Board) Only
replaceable
part is a Type
ATC or ATO 3
amp fuse (Color
Code Violet),
P/N 201685
Ignitor - Refer to FIGURE 22 and locate the ignitor.
Disconnect the wire; remove the screw and the
ignitor. Clean the ignitor assembly with an emery
cloth.
Spark gap must be maintained to 1/8”. See
FIGURE
25.
Ignitor
For further information
and check out pro-
cedure on the direct
spark ignition system,
refer to Paragraph 8.3
and the Troubleshoot-
ing Flow Chart in Para-
graph 10.3.
CAUTION: Due to
high voltage on
the spark wire and
electrode, do not
touch when ener-
gized. See Hazard
Levels, page 2.
Inspect the Lower
Portion of the Heat
Exchanger (with burner
assembly removed)