Trane TCONT900AC43UA - Demand Defrost Control Checkout; Board Variations

HP - B 9
Control Boards
Demand Defrost Control Checkout
Service Facts shipped with the outdoor unit contains
a check out procedure table. The check out procedure
table can also be found in the Reference section of
this book.
Board Variations
There are some variations between control boards for
different communicating product models. Variations
are shown here.
16 SEER Control Board
20 SEER Control Board
OUTDOOR CONTROL
BOARD - PIN
IDENTIFICATION
PIN IDENTIFICATION (SEE FIGURE 6.)
1. TEST_COMMON (Shorting any of the other pins to this pin causes the
function of the other pin to be executed. Leaving this pin open results in the
normal mode of operation.)
2. TST = Test (Shorting TEST_COMMON to this pin speeds up all defrost
board timings.)
3. FRC_DFT = Forced Defrost (Short TEST_COMMON to this pin for two [2]
seconds to initiate a forced defrost. Remove the short after defrost
initiates.)
FIGURE 6.