Function ‐ Available Equipment Modes; W2 Relay Function - Smart temp SMT?770 Installer Manual

Fn = A Function ‐ Available Equipment Modes
FN = A ‐ Select if controlling a Heating & Cooling system.
FN = C ‐ Select if controlling a Cooling only system. (disables heating menus)
FN = H ‐ Select if controlling a Heating only system. (disables cooling menus)
FN=‐‐ ‐ (Dash) This mode will set SMT‐770 to Heat only, Cool only or OFF .
(Emergency heat will also be selectable if fitted)
H3 = Of W2 relay Function
Only operates in single fan speed HP mode. (Sw1=off & 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 a Add On Heat system.
H3 = FF ‐ SMT‐770 set up in "Fossil Fuel" Mode (Comp stops with Aux heat)
H3 = AL ‐ SMT will permit both Aux heat & E. Heating mode (both use W2 relay)
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