![ST-312](https://b3447975.smushcdn.com/3447975/wp-content/uploads/2011/05/ST-312.png?lossy=1&strip=1&webp=1)
ST-31
- 2-Digit Backlit LCD, Four Push-Buttons (up, down, mode, fan)
- 4 Digital Outputs (relay N.O.)
- On Board Temperature Sensor
The Smart Stat™ model 31 is a LonWorks® technology based thermostat controller using a Neuron® 3150® processor. Model 31 contains relays for local control of terminal units. It comes from the factory programmed to control a standard single stage rooftop unit. Other functional profiles can be downloaded into the thermostat for heat pump, multi-stage and user interface applications.
Factory programmed features include: local set point control with limits that can be changed via the network; four application control modes: auto, heat, cool, and off; manual fan control; network broadcast of local temperature, set point, and terminal unit status; set point, temperature offset, and control delta adjustment for the network; and button combination for logical installation.
The Smart Stat™ model 31 can be reprogrammed and has 56K bytes of user-programmable memory.
General
Processor: 3150 @ 10MHz
Memory: 56 Kbytes Flash EPROM, 2 Kbytes RAM (Neuron), 0.5 Kbytes EEPROM (Neuron)
Communications: LonWorks FTT-10A
Power Input: 21-28 VAC or 21-40 VDC
Environmental: 0 to 50°
Physical Dimensions: H 124mm xW 79mm xL 23mm, (4.9” x 3.125” x 0.925”)
Relay Output: 1A @ 24 VAC/DC max.
ST-30/31 – Model B
56K flash memory only
ST-30/31 – Model M
Standard model, selectable memory (flash, SRAM)
ST-30/31 – Model C
Real time clock with super cap back-up, selectable memory (flash, SRAM) and 8K serial EEPROM