Trane TAMXB0A24V21DB Installation, Operation And Maintenance Manual page 68

T T r r o o u u b b l l e e s s h h o o o o t t i i n n g g
Verify that OD
condenser coils
are clean
Add refrigerant
until subcooling
reaches ~10F
Recheck
superheat
Replace EEV
NO
Stepper Motor
68
Superheat above 30F at OD unit
Verify line set is
properly sized for NO
application
EEV and coil are working.
Replace AHC
Check operation
YES
Does suction
pressure go
down?
NO
Ohm coil per Stepper
Motor Tables
Is ohm reading
correct?
YES
Replace EEV
Check operation
HIGH SUPERHEAT
Start Here
Is subcooling at
the outdoor unit YES
between 8-12F?
indoor unit within 8ºF of
Diagnostics Mobile App
Perform
"CLOSE VALVE"
YES
from Diagnostics
Mobile App
Perform
temperature
sensor check
Is liquid line
NO
temperature at the
outdoor liquid line
temperature?
The system is running at
maximum capacity and
YES
thismay be causing the
highsuperheat. Wait until
Perform
theindoor temperature is
"OPEN VALVE"
less that 80F and check
test from
Does
superheat drop
NO
below 30F?
NO
Verify line set size
and charge is
correct
thesuperheat again.
YES
Is indoor
temperature
>85F?
18-GJ89D1-1F-EN