Form I-UDA, P/N 195673 Rev 13, Page 3
10..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..4 Ignition System
DSI Integrated Control Module (circuit board)
- See
FIGURE 0
. 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 0 - DSI
Integrated Control
Module (Circuit Board)
Only
replaceable
part is a Type
ATC or ATO 3
amp fuse (Color
Code Violet),
P/N 01685
FIGURE 1 - Ignitor
showing required
Spark
Gap measurement
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Ignitor -
Refer to
FIGURE 18
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 1
.
IMPORTANT:
When re-assembling, the brown ground wire must remain attached to
the ignitor.
Ignitor
CAUTION: Due to
high voltage on
the spark wire and
electrode, do not
touch when ener-
gized. See Hazard
Levels, page .
Flame Sensor
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.
Flame Sensor
- Refer to
FIGURE 18
and locate the flame sensor. Disconnect the wire;
remove the screw and the flame sensor. Clean with an emery cloth.
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 ori
-
fice. 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 con
-
nection with leak detecting solution.
7.
Turn on the electric and the gas. Check for proper operation.
10. Maintenance
and Service
(cont’d)
10.. Burner Maintenance (cont’d)
Re-Install the Burner (cont’d)
10. Maintenance
Procedures
(cont’d)
