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Test Mode Operation
FIGURE 12
Apply jumper to test pins for
longer than
0.5 seconds,
but less than 2 seconds.
Short cycle lockout and/or 3−strike pressure
fault lockout function are cleared, if applicable.
Unit continues operating in existing mode.
Short cycle lockout or 3−strike pressure fault
lockout function are cleared, if applicable.
COOLING MODE
HEATING MODE
DEFROST MODE
Remove and reapply test jumper
to return to test mode, if desired.
Controller will check ambient and coil temperature sen-
sors to see if sensors are open or shorted. If one of the
sensor circuits is open, the unit will remain in Heating
Mode. Remove and reapply test jumper to return to test
mode, if desired. If sensor circuits are closed, the unit
will go into Defrost Mode.
Defrost mode ends. Unit enters Heating
Mode with defrost timer set for 34 minute
test. Remove and reapply test jumper to
return to test mode, if desired.
Test jumper is applied longer than 5 seconds.
Test jumper is removed before 5 seconds.
Unit returns to Heating mode with defrost
timer set for 34 minute calibration defrost.
Remove and reapply test jumper to return
to test mode, if desired.
Unit remains in Defrost Mode until defrost
is terminated by time or temperature.
Y1 Active
To Engage Test Mode − Place the temperature select shunt (jumper) across the test pins.
Apply jumper to test pins for
more than
2 seconds.
