Look up DIP switch setting #6 for "O/B" reversing valve logic. The manual states that Trane heat pumps typically energize the reversing valve in Cooling mode (B terminal), whereas Carrier/Rheem energize in Heating (O terminal). If set wrong, the valve doesn't shift.
Before diving into the manual specifics, it is crucial to understand what the Tracer 100 is and what it is not. Trane Tracer 100 Manual
: While physical manuals for this legacy system may be out of print, newer service tools like provide updated user guides for modern Trane controllers. specific section Look up DIP switch setting #6 for "O/B"
The Trane Tracer 100 is a for small to medium-sized HVAC systems. It is commonly used for: Trane Tracer 100 Manual