Robertshaw Smart Sense Series Installation Manual page 30

FN = D-: Do not use.
H3 = OF W2 RELAY FUNCTION
Only operates in single fan speed HP mode (Sw1 = OFF and Sw2 = ON)
H3=OF: W2 relay is used as 2nd (or 3rd) stage Auxiliary Heat
H3=EH: W2 relay is used to control an Emergency Heating system
H3=AH: W2 relay is used to control an Add On Heat system
H3=AL: Will permit both Auxiliary Heat and Emergency Heating mode (both
use W2 relay)
H3=FF: Set up in Fossil Fuel Mode (Compressor stops with Auxiliary heat)
TT = RS TT TERMINAL FUNCTION FOR REMOTE SENSORS
(See PAge 39)
TT = OA: Connect the outside air temperature sensor to the TT terminals to
display the outside Air Temperature. Required for all outside air
control functions to operate.
TT = RS: Connect the remote room temperature sensor to the TT terminals
to measure the temperature at a remote location away from
the thermostat. Disables the temperature sensor fitted to the
thermostat.
TT = AV: The TT terminals will average the temperature measured by the
thermostat internal sensor and remote room temperature sensor(s).
TT = OF: A closed contact on the TT terminals will switch the thermostat ON
or OFF. More detail on this function provided on page 43.
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