Step 5: Remove Thermal Release Device Housing; Step 6: Locate And Discard Spring Clip; Step 7: Install New Trd Assembly; Step 8: Check Trd Positioning - Rheem Ruud TRD Technical Service Bulletin

How to Replace the Thermal Release Device (TRD)
5. Locate and remove the thermal release device housing. It
is in the middle of the combustion chamber toward the
rear. Grab the housing, push down and rotate it counter
clockwise 90 degrees. Lift, remove and discard.
6. Locate the spring clip. When the TRD failed, the glass
bulb ruptured allowing the spring to release. The spring is
located inside the combustion chamber. Look under the
floor shield above if not in plain view. Discard used
spring clip.
7. Place the TRD assembly over the damper rod. Line up the
shut off plate rod with the hole in the bottom of the TRD
assembly. Press down firmly until the rod seats. Rotate
the TRD installation tool 90 degrees clockwise. Lock the
TRD assembly into the flanges of the mounting bracket.
8. Check positioning of the TRD assembly. It should not
move. Shut off plate rod should not be visible.
9. Replace the gasket and burner access door assembly.
(Note door gasket color may vary.)
1446 How to Replace the Thermal Release Device (TRD).docx
TECHNICAL SERVICE DEPARTMENT
Technical Service Bulletin
1-800-432-8373
Rheem Guardian System
Technical Competence, Product Confidence
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