Summary of SMT - 131
Page 1
Smt - 131 manual ver 1.1.
Page 2: Index
Page 2 revision history version 1 original document version 1.1 added mode select in modbus index index 2 introduction 3 thermostat operation 3 installation 4 wiring examples – hvac control 5 wiring examples – ancillary functions 7 installer options menu 10 modbus data 11 specifications 15.
Page 3: Introduction
Page 3 introduction the smart temp smt-131 thermostat has been designed for use in hotel rooms and other locations where the user may be unfamiliar with thermostat operations. In these applications it is important that the thermostat be very intuitive, robust and attractive. The smt-131 thermostat h...
Page 4: Installation
Page 4 note. Option 16 in the installer menu (see page 11) permits you to set the smt-131 to reset the indoor fan to automatic mode (cycle on and off with heating and cooling) every time the thermostat is turned off and then back on. Ventilation mode if permitted by dip sw7, (see page 5) the user ca...
Page 5
Page 5 dip switch settings switch function on off sw1 indoor fan mode 3 fan speed 1 fan speed sw2 equipment type heat pump heat cool sw3 hp mode (sw2= on) hc mode (sw2=off) rev valve heat (b) he – fan with heat rev valve cool (o) hg – no fan in heat sw4 not used sw5 comp protection delay 5 min anti ...
Page 6
Page 6 when using a separate power supply for the valve, please ensure both power supply’s 0 volt terminals are joined so the 0-10v signal has a return path. In this example, the relay “y” terminal could be used for a circulating water pump call if needed. Heat cool system - 1 fan speed switch setti...
Page 7
Page 7 belimo 6 way valve belimo manufactures an actuator that is in full cooling at 2v, off at 6v and full heating at 10v. To use this type of actuator with the smart temp smt- 131 you must enter the installer menu and set valve type to “belimo mode”. Information on the installer menu can be found ...
Page 8
Page 8 modbus wiring modbus communications unlock many additional functions within the smt-131 thermostat. It also permits all modes, functions and controls to be remotely supervised and adjusted from a central location if needed. Modbus object data can be found on page 10 of this manual. The smt-13...
Page 9
Page 9 outside door station when coupled with the optional smart temp door station the guest has the ability to set the room as “do not disturb”, call for housekeeping or be alerted to visiting guests with a pleasant doorbell chime. Hotel staff are informed about the room status or guest’s needs by ...
Page 10: Installer Options Menu
Page 10 installer options menu the smt-131 has an impressive list of options that can be installer selected. These options tune the thermostat’s performance as well as set energy conservation settings. This menu is deliberately hidden and difficult to enter to discourage unauthorised tampering. The ...
Page 11: Modbus Data
Page 11 9 auto off timer off, then 1 to 10 hours in 30 min intervals (default = off) 10 unoccupied heat set point off, then 5°c to 30°c (41°f to 86°f) (default = off) 11 unoccupied cool set point off, then 5°c to 30°c (4°f1 to 86°f) (default = off) 12 unoccupied fan mode 1 = low (auto) (default) 2 =...
Page 12
Page 12 data format protocol modbus rtu byte format 1 start bit, 8 data bits, 1 stop bit, no parity address 1 to 255 baud 4800 / 9600 / 19200 bps holding register type value comments 4000 1 read only device id always returns “131” use as a sentinel point 4000 2 read only firmware version divide by 1...
Page 13
Page 13 4000 9 read / write user set point deg c = 0.5°c steps deg f = 1°f steps value / 10 ( e.G. 23.5°c = 235) 400 10 read / write contact reception notification 0 = off 1 = show contact reception on lcd smt-131 lcd will flash “contact reception” on lcd and sound chime. User may accept alert by to...
Page 14
Page 14 400 23 read / write unoccupied cool set point 0 = off 5°c to 30°c in 0.5°c steps 41°f to 86°f in 1°f steps value / 10 ( e.G. 28.5°c unoccupied cool = 285) 400 24 read / write unoccupied fan mode 3 fan speed mode 1 = low (fan auto) 2 = med ( fan auto) 3 = high (fan auto) 4 = low (fan on) 5 = ...
Page 15: Specifications
Page 15 400 42 read only permitted modes (ver 2.1+ only) 0 = auto (heating and cooling called) 1 = heat only mode 2 = cool only mode specifications input voltage 24vac 50/60 htz +/- 15% operating temperature 0°c to 50°c (32°f to 122°f) operating rh 0-95% (non condensing) storage temperature 0°cto 65...
Page 16
Page 16 great care has been taken in the preparation of this manual. Smart temp australia p/l takes no responsibility for errors or omissions contained in this document. It is the responsibility of the user to ensure this controller or equipment connected to it, is operating to their respective spec...