Wiring Examples – Hvac Control; Dip Switch Settings; Heat Pump System - 3 Fan Speed - Smart temp SMT - 131 Manual

DIP Switch Settings

Switch Function
Sw1 Indoor Fan Mode
Sw2 Equipment Type
Sw3 HP Mode (Sw2= ON)
HC Mode (Sw2=OFF)
Sw4 Not Used
Sw5 Comp Protection Delay
Sw6 Not Used
Sw7 Ventilation Mode
Sw8 Door Station (Optional)
Note: The SMT-131 reads the switch settings on power up only. If you change any DIP switch
settings you must cycle power or press the reset button before these changes will take effect.
Wiring Examples – HVAC Control
Caution - Although the SMT-131 is a robust device, wiring errors can potentially
damage the thermostat. This damage is NOT covered by warranty. Take care when
wiring 24V near sensor inputs or the modbus communications terminals.
Provided below are a few typical examples of wiring. These can be adapted to meet specific
project or user needs. For example, heat pump 3 speed fan and heat pump single speed fan are in
essence the same wiring except for DIP switch 1 position and the fan med and high speed
terminal wiring.

Heat Pump System - 3 Fan Speed

On
3 Fan Speed
Heat Pump
Rev Valve Heat (B)
HE – Fan With Heat
5 Min Anti Cycle
Permitted
Fitted
Page 5
Off
1 Fan Speed
Heat Cool
Rev Valve Cool (O)
HG – No Fan In Heat
No Anti Cycle
Not Permitted
Door Station Not Used
Switch Settings
Sw1 = On - 3 Fan Speed
Sw2 = On - HP Mode
Sw3 = On/B Off/O
Sw4 = N/A
Sw5 = On - Comp Delay
Sw-6 = Customer Pref
Sw7 = Customer Pref