Operating instructions
1104UESAGBEN, page 23/31
11.2.1 Heat exchanger maintenance
This heater has a T-CORE
3 TM
heat exchanger (patent pending). Remove any exter-
nal dirt or dust accumulation. Visually check the heat exchanger for cracks and holes.
If a crack or hole is observed, replace the heat exchanger.
A T-CORE
3 TM
heat exchanger has a primary and a secondary heat exchanger,
check both sections.
Note :
Inspection of the lower portion of the heat exchanger is done with the burner removed.
See the Burner Service section below for information on inspecting the lower section
of the heat exchanger.
11.2 Maintenance
procedure
Figure 16b : Internal control panel assem-
bly located on a removable bracket
11.2.2 Burner maintenance
This heater has a unique one-piece T-CORE2® burner assembly designed to provide
controlled fl ame stability without lifting or fl ashback. The burner can be removed as a
unit for inspection or service : see below for removal instructions.
Inspect the burner/control compartment annually to determine if cleaning is necessary.
If there is an accumulation of dirt, dust, and/or lint, clean the compartment and follow
the instructions below to remove and clean the burner.
Caution : use of eye protection is recommended.
Instructions for burner removal
1. Outside the cabinet, shut the gas supply off at the manual service valve ahead of the
union
2. Turn off the electric supply.
3. Disconnect the gas supply at the union outside of the cabinet.
4. Open the access door.
5. Disconnect the manifold and move it out of the way. At the gas valve, mark and dis-
connect the connector. Carefully remove the burner orifi ce and orifi ce adapter lock-
ing nut. Slide the orifi ce adapter out through the bracket on the burner pushing the
manifold to the right. This will move the manifold out of the way.
Burner removal
6. Locate the burner body front support. Remove the screws that attach it to the sec-
ondary air shield (fi gure 18a).
7. Holding the venturi tube, slide the entire burner slightly to the right to disengage the
burner from the supports on the left. Then rotate the open end of the venturi tube
outward away from the heater. Carefully pull the burner assembly out of the cabinet
(fi g. 18b)
13) Control relay (ER)
14) Terminal blocks
15) Connector
16) Pressure switch (S3)
13
14
15
16