SMART TEMP SMT-131 Hotel Touchscreen Thermostat User Manual

SMART TEMP SMT-131 Hotel Touchscreen Thermostat User Manual

Introduction

The Smart Temp SMT-131 thermostat has been designed for use in hotel rooms, guest accommodation and locations where the user will require a thermostat that is simple to use. Further, given the nature of the hospitality industry in general it is important that the thermostat be robust, flexible in function and attractive. The SMT-131 thermostat has been designed with these important goals is mind.
The SMT-131 also offers advanced energy conservation features such as set point limit control, automatic un-occupied heating and cooling settings as well as Modbus RTU communications for integration with the “Building Automation System” (BAS) or “Hotel Check In” system. Additionally, the SMT-131 seamlessly interfaces with the Smart Temp OC-3D occupancy detection system and HOT-242 “Door Station” system for added functionality.

Thermostat operation

The SMT-131 is an extremely simple thermostat to operate and has been designed to not require a user manual.
The diagram to the left shows all LCD elements and the 7 buttons (Up / Down / Make Up Room / Do Not Disturb / On – Off (mode) / Fan Mode / Deg C-F Select.
Depending on switch and installer menu settings not all LCD segments or buttons maybe shown.

On/Off (Mode)

Tap the On/Off button to turn the thermostat On or Off and if permitted to select heat only or cool only mode. (To ensure the simplest user operation on/off only Mode is set as default).
Note – for simplicity – If the thermostat is OFF by simply touching the thermostat display will turn it on.

Set Temperature

Adjust the target temperature with the Up or Down button. The range of temperature adjustment can be limited with the installer setting “heat and cool limit setting”. ( See page 16) __

Fan

Single fan speed mode (Sw1= Off) (See Dip switch settings page 5)
Tap the fan button to cycle between auto fan and continuous fan mode.
Three fan speed mode (Sw1= On) (See Dip switch settings page 5)
Tap the fan button to cycle between low, medium, high and auto fan speeds. Press and hold the fan button to turn the fan on continuously.
Note. Option 16 in the installer menu (See page 16) permits you to set the SMT-131 to automatically 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 if desired.
If Auto Fan mode is selected, then when the heating and cooling stops, so will the fan (after any purge periods have expired if set- see page 16)
If Fan On mode is selected, then the fan will continue to run after the heating and cooling stops to maintain ventilation.

Ventilation Mode

If permitted by DIP Sw7, (See page 5) the user can run the indoor fan only (Ventilation Mode) when the SMT-131 is off by tapping the fan button. Each tap of the fan button will cycle between all available fan speeds.

“Make up Room” & “Do Not Disturb” Buttons

When enabled by DIP Sw8, (See page 5) pressing these buttons will activate relevant LCD segments and backlight colour on the optional outside door station as well as write data to Modbus for monitoring by a BAS system.
Note – you do not need the outside door stations to be fitted if you simply wish this data to be presented to Modbus.

Installation – HVAC Control

System Design

Great effort has been taken to make the SMT-131 system intuitive, reliable and easy to install. Using a common-sense approach to the installation will ensure this product is installed easily and to the customer’s satisfaction. Please read and understand this instruction manual so that installation, testing and commissioning process is undertaken in an effective and efficient manner.

Opening Wall Controller

Open the SMT-131 wall controller by placing a flat blade screwdriver or coin in the slot on the bottom of the thermostat case (1) and
gently twist (2) to release the case locking clip. Gently pry the two case halves apart at the base taking care not to twist the case as this may crack the LCD.

Mounting wall Controller

The SMT-131 should be mounted in a convenient location at approximately 1.2 to 1.5 meters from the ground. It should be in a “typical” location where it will sense the accurate room temperature and not be affected by direct sunlight or drafts.
It is highly recommended that any penetrations in the wall where wiring may pass for example be sealed to prevent drafts from entering the rear of the thermostat and effecting the room temperature sensor accuracy.

Take care to ensure excess wiring is not trapped between the cases half’s when closing – push excess wires into the wall cavity. Never press on the LCD when closing the SMT-131 as it may crack. Always press on the SMT-131 plastic case only

DIP Switch Settings

Note: The SMT-131 reads the switch settings on power up only. If you change any DIP switch settings you must power cycle before these changes will take effect.
It is expected that only qualified people will make adjustment to these dip switch settings. Knowledge of the HVAC system under the control of the SMT-131 is essential prior to making adjustment to these DIP switch settings.

Caution Incorrect adjustment of these DIP switch settings could cause HVAC equipment damage. This would NOT be covered by warranty.

Wiring – HVAC Control Terminal Designations

OFF)
Med| Indoor Fan Medium Speed ( NOT Used in Single fan speed mode – Sw 1 = OFF)
Low| Indoor Fan Low Speed (Used in single & three fan speed mode)
Y| Compressor or Cool – (Based on Sw 2 setting)
W – O/B| Reversing Valve or Heat – (Based on Sw 2 setting)
A1 – Cool| 0-10V Output for Cooling (Typically used to control modulating valves)
A2 – Heat| 0-10V Output for Heating (Typically used to control modulating valves)
A3 – Fan| 0-10V Modulating Output for Indoor DC Fan
Com – 0V| 0V terminal – Used for 0-10V, sensor or digital inputs ground reference
A| Modbus Data A
B| Modbus Data B
SI| Remote temperature sensor input (Remote / average / Modbus data use)
DI| Digital (Switched input) for forced un-occupied or initiate doorbell function
WC| Window Contact – Forces SMT-131 OFF if window open > 5 min (Adjustable)
DS| Door Switch – Monitors room door status for occupancy detection (see page 11)
PIR| PIR (Movement sensor) input for occupancy detection (see page 11)

The SMT-131 is powered by 24VAC and requires the 24VAC active and neutral to be connected to the “R” (active) and “C” (Neutral) terminals for the SMT-131 to function. The 24VAC applied to the SMT-131 “R” terminal is switch back through the 2A relays to the equipment. Note the drawing provided here

Caution – Although the SMT-131 is a robust device, wiring errors can potentially damage the thermostat. Warranty does NOT cover this damage. Take care when wiring 24V near sensor inputs or the Modbus communications terminals.

Note – When the SMT-131 calls heating or cooling the SMT-131 will drive both the relays and the 0-10V outputs simultaneously. This way the SMT-131 can call a circulating water pump via the relays as it controls room temperature with valves if needed.

0-10v Outputs

To permit the control of modulating heating and cooling valves as well as variable speed DC fan motors or variable capacity HVAC systems the SMT-131 has been fitted with 3 x 0-10V outputs.The 0-10V outputs in the SMT-131 are PI (Proportional Integral) controlled. This control method provides the most accurate and cost-effective way to control heating and cooling valves by ensuring set temperate are reached as quickly and efficiently as possible while reducing temperature overshoot.

As the SMT-131 is fitted with both relays as well as 0-10V outputs to control HVAC systems there may be some slight disparity between the thermostat display and the 0-10V outputs actions. The SMT-131 displays the relay actions more than the actions of the 0-10V outputs on the LCD. In most cases these are very closely matched however as the 0-10v outputs have the capability of providing finer control than do the ON/OFF relays the heating and cooling calls may have started slightly before indicated on the thermostat display. This is true of the fan also.

A1 – Cool

This output is used to control a cooling valve.

A2 – Heat

This output is used to control a heating valve.

A3 – Fan

This output is used to control a variable speed fan or a variable capacity AC system. If the fan mode is set to
Auto speed the 0-10V output will vary between these two values based on calculated demand. If the user selects LOW speed, the 0-10V output will be fixed at 3.3VDC, when Medium speed is selected the 0-10V output will be fixed at 6.6VDC. High speed is set to 10VDC
The installer menu provides the following settings for the control of the three 0-10V outputs.

Span

This is the value where the output is at maximum value. It sets how aggressive the 0-10V will move for a given temperature change. Range is 0-5C

Time Interval

Time interval sets the running average calculation time. The smaller the number the faster the 0- 10V output will respond to room temperature changes. Range is 10 – 300 seconds.

Direction

Forward action 0V = 0% open and 10V = 100% open; reverse action sets 0V = 100% open and 10V = 0% open.

Minimum Value

Rather than start the output at 0V, when the output is called it will immediately jump to this value. It will then vary the output to maximum. When approaching set point the value will drop from the minimum value to 0v in 1 step. This setting is particularly useful for fan control as it will not permit the fan to run too slowly when close to set point.

Maximum Value (Fan A3) output only

When controlling 0-10V fans sometimes it is necessary to limit the fan speed to reduce noise or to protect ducting. The fan output has a high voltage limit setting so regardless of the user selected speed (High, Medium or Low) or thermostat selected auto speed the 0-10V output will not exceed this pre-set high limit.
These settings can be found in the installer menu (starting on page 16)

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”.

The heating 0-10v output only is used in this mode
Information on the installer menu can be found on page 15 of this manual.
As with normal valves, the 0-10V heating and cooling span settings in the installer menu scale the heating and cooling outputs. Factory default is full heating and full cooling 1°C from set point. The heating and cooling span can be adjusted independently to a maximum of full heating and full cooling 3°C from set point. The output is linear.
Note When using “Belimo” ™ mode, both the A1 “cool” and the A2 “Heat” 0-10 output are used. Both will provide the same output to the value. (The A3 “fan” output will remain unchanged and can be used to control a DC fan or other devices).

2 Pipe Mode

The SMT-131 can measure water temperature via a sensor strapped to the water pipe and wired into the SMT-131 Sensor input terminals (SI and Com 0-10 input). Based on the pipe temperature, the room temperature and the set point the SMT-131 will control either the heating or the cooling outputs to maintain guest comfort. If the pipe temperature is above 30c, the 131 is in heating mode. If the pipe temperature is below 20c, cooling mode is used. Between 21 and 29 there are no calls. (Version V41.1 firmware and newer the heating and cooling thresholds are adjustable from within Installer Menu. Option 44 will adjust the heating mode threshold (default 30) and option 45 will adjust the cooling mode threshold (default 20).

When 2 pipe is mode is used, the SMT-131 will open the water valve for 30 seconds every 10 minutes to allow water to flow within the pipe so that the SMT-131 can sample pipe temperature to determine / confirm operation mode. (Version 41.0 or later firmware will open the valve 25% for 2 minutes every 10 minutes when heating or cooling is required to check if the water temp is suitable)
If mode selection is permitted, the SMT-131 will only permit the appropriate mode to be selected based on the pipe temperature.
To use the SMT-131 in 2 pipe mode set DIP 2 OFF and DIP 4 to the ON position. Set Installer menu option 27 “Si & Com 0-V” to option “3” – 2 Pipe Mode. (See page 17)

The pipe sensor needed for 2 pipe mode is the RS-1d sensor – available as an optional part from Smart Temp or an authorised distributor.

Klixon Mode / 2 pipe

The SMT-131 Heat and Cool mode can be changed by a remote manual mechanical switch or an automatic Klixon switch if required. ( A klixon switch is a mechanical temperature switch typically placed on a water pipe and use to detect water temperature, therefore selecting the correct thermostat mode based on the temperature of water in a fan coil).

To activate Klixon mode

• Place a Klixon switch (or mechanical switch) between the DI and Com
• Turn On DIP switch 4 (Two pipe Mode = ON).
• Turn On DIP switch 6 ( Klixon mode = ON).
• Enter the installer menu and select option 2 (Klixon Mode) in menu item 29.

The SMT-131 will automatically change Installer Option 1 to function 2 (manual change over mode). The user will therefore only be permitted to turn the thermostat On or Off, adjust set temperature and fan modes (if applicable)
By default, heating mode will be selected if the switch is closed, and cooling mode will be selected if the switch is open. Should you wish to reverse this input logic adjust Installer Option number 40.

Ancillary Functions

The SMT-131 has several additional capabilities such as communications with Building Automation systems via its Modbus communications port. The SMT-131 will automatically control temperature set points based on occupancy of the room when a suitable door switch and movement sensor is fitted. The SMT-131 can even automatically shut down the air conditioning system if balcony doors or windows are left open when the optional door / window switch are fitted.
When you wish indication of the room status and an integrated doorbell from the hall way outside the room, the SMT-131 can be fitted with the optional “HOT-243” hall panel.

Complete System Overview

The SMT-131 is the hub of a compressive room comfort and energy control system. As shown in the picture the SMT-131 accepts door, window and PIR contact inputs to automatically control temperature set points. The HOT 243 wall controller mounted in the hallway outside of the room provides feedback of the guests needs to housekeeping plus provides a convenient button to
activate the SMT-131 internal door bell.
Regardless of the need to control conferential HVAC systems, 2 or 4 pipe fan coils with modulating valves the SMT-131 has the necessary outputs to achieve your control needs.

Occupancy Detection

The SMT-131 has sophisticated logic that when connected to your choice of movement sensors, door and window switches will automatically control the set point and mode of the SMT-131.
Using part or all the functions described below are completely optional. The SMT-131 will function
perfectly as a HVAC controller without the door, window or occupancy detection logic enabled.
There are two types of occupancy detection modes provided by the SMT-131, see latched occupancy detection on page 11 or PIR only occupancy detection on page 12 of this manual.

DO NOT APPLY EXTERNAL VOLTAGES TO THESE INPUTS

**Window Contact**

The window contact input (WC) is used to automatically disable the HVAC system if a window is left open. This is done to prevent energy waste by trying to heat or cool an open room.
The SMT-131 window input can be set for a Normally Open (switch open when window is closed) or normally closed logic (switch closed when window is closed). When the window is left open for longer than the pre-set time (0 to 300 seconds) the SMT-131 will automatically turn OFF. The text “OFF” will flash in the LCD to indicate that the remote window (or door switch) is holding the SMT-131 in off mode. The wall controller will prohibit all changes.
The SMT-131 will automatically restart once the window is closed.
The Installer menu option 28 “Window Input Logic” and option 29 “Window Input Delay” (page _17)_sets the window detection logic in the SMT-131.

Fault Indication

The SMT-131 can display the text “FLt” alternating with the temperature should you wish to alert the user of an external fault with the heating or cooling system.To enable this function, enter the installer menu and set the Window contact input setting 31 to option 3.  (See page 17 for this setting).
When the WC terminal and the Com-0V terminal are joined the SMT-131 will alternate “FLt” with the current room temperature.
Register 32 will permit a time delay to be set after the fault signal is received if necessary to reduce false trips.
The fault indication has NO effect on thermostat function

Door Switch

The Door switch input (DS) is used by the SMT-131 for 3 functions.

• To detect that the door has been opened and then closed to let somebody into or out of the
• To detect if the door has been left open.
• To use as an occupancy or Auto-Off timer in training rooms or

The SMT door switch input can be set for a Normally Open (switch open when door is closed) or normally closed logic (switch closed when door is closed) or OFF (input not used). The Installer menu 30 “Door Input Logic” and option 31“Door Input Delay” (page _17)_sets the door detection logic in the SMT-131.

Entering or exiting the room.

Once the door is opened and then closed the SMT-131 will begin its occupancy detection process using the PIR input described below. Based on the outcome of this process the SMT-131 will remain on and permit guest interaction with the SMT-131 (adjust mode and set point for example), or switch to “un-occupied” mode where the SMT-131 will substitute the guest set point and mode for the installer pre-set values.

Door Left Open

When the door is left open for longer than the pre-set time (0 to 300 seconds) the SMT-131 will automatically turn OFF. The text “OFF” will flash in the display to indicate that the remote door (or window switch) is holding the SMT-131 in off mode. This is done to prevent energy waste by trying to heat or cool an open room.
The SMT-131 will automatically restart once the door is closed.

PIR input

A PIR (passive infra-red) movement detector can be directly wired to the SMT-131 “PIR” input. As movement is detected by the PIR it will send multiple On/Off pulses to the SMT-131 every time it detects movement. The SMT-131 using this data (with or without a door switch) will determine the occupancy status of the room and behave accordingly. Note, the PIR must be separately powered, typically from a 12VDC supply. Consult the PIR manual for this information. Smart Temp do not provide a PIR sensor, and suitable alarm PIR sensor is suitable.

Latched Occupancy Detection Logic

(Typically used in Hotel applications) Latched occupancy detection requires a door switch and PIR input to be wired and working.
When the door is first opened the SMT-131 instantly enters “Occupied Mode” where the SMT-131 will permit the room occupant to set their desired temperature and mode of operation. Once the door is closed the SMT-131 will “look” for movement as detected by the PIR sensor wired to the PIR input. If no movement is seen within the installer pre-set seek time (installer adjustable 1 to 15 minutes) the SMT- 131 will return to “Un-occupied mode” where the users temperature and mode will be replaced with installer pre-set values. Should movement be detected within the installer pre-set seek time the SMT-131 will Latch into “Occupied Mode” and no longer rely on continued movement within

the room to remain in “Occupied Mode”. This ensures that the room remains a conditioned space even if the occupant stops moving or sleeps for example. Next time the door is opened and then closed again the SMT-131 will again begin its occupancy detection process.
Note – even when the SMT-131 is in “un-occupied mode” it will continue to use the PIR input to determine room occupancy. For example – in a hotel a couple may be staying in the room and one leaves the room leaving the other asleep in bed. As the door closes the SMT-131 will seek movement and when none is found it will enter “un-occupied mode”. As the sleeper wakes and then moves the SMT-131 will automatically re-enter “Occupied Mode” even though it may have been some time since the door was closed.
Installer option “PIR Input Delay” (page 17 ) sets the PIR mode (On or Off) and the seek time value (1 to 15 minutes).

Using a PIR Only for occupancy Detection

(Typically used in meeting or class room applications)
When you require the SMT-131 to turn the Heating and Cooling on when people enter a room and off when people exit the room such as maybe the case in a conference or class room.
Wire the PIR directly to the DS (door switch input) of the SMT-131. When movement is detected by the PIR sensor the SMT-131 will turn the Air conditioning on maintain the set point. After the last person has left the room the SMT-131 will wait an installer defined time and then switch to “Un- Occupied Mode”
Steps to use the SMT-131 in automatic occupancy detection mode.

1. Wire the PIR movement detector into the DS (Door Switch)
2. Set the PIR input delay period (See page 17 for information on setting the PIR input delay) to the number of minutes that you wish the Airconditioning to run after the last movement has detected in the space.
3. Place a link permanently shorting the PIR input to Com

Manual Occupancy Input

The DI (Digital Input) & Com 0-10 terminals within the SMT-131 can be used to instantly force the SMT-131 into “Un-occupied Mode”. This input can be wired to a simple card reader or other 3rd party system that may be pre-installed for room occupancy detection.
When the SMT-131 is in “Un-occupied Mode” the display will go completely blank except for the words “Unoccupied” in the top left corner. If the optional HOT-243 hall way panel is installed its display backlight will go out to let housekeeping know the room is empty. Modbus register 40004 also indicates occupancy status.

Doorbell

A built-in doorbell feature is included with the SMT-131 thermostat. This is normally activated by the optional outside door station as described above or via Modbus data link. In circumstances where this is not convenient the Digital Input (DI) terminals can be reassigned as a doorbell

activation switch with the digital input options detailed in the installer menu. (see page 17 ). Simply place a momentary volt free switch across “DI” and Com “0-V” terminals to activate the doorbell. Once pressed, the doorbell will chime for about 10 seconds.

Outside Door Station

When coupled with the optional Smart Temp door station the guest can 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 text information displayed on the door station LCD or the door station backlight colours.
Connection between the SMT-131 and the hotel door station is cable fitted with RJ12 plugs. Cables can be provided at additional cost at up to 15 metres maximum. Alternatively, custom cables can be produced. They are direct wired (not cross over).
When fitting the door station, the SMT-131 DIP Sw8 must be ON. The outside door station will flash all LCD segments if DIP Sw8 is in the wrong position.

Automatic Day Set Temperature

The SMT-131 can optionally reset the user set point and replace with an installer defined set point after the SMT-131 has been off for more than 6 hours. This will typically happen after one guest has checked and before the next guest checks in but will not generally affect a guest who may turn the thermostat off for a few hours or so or who may go out for the afternoon.
Option 40 in the installer menu defines this Function. Off or a value between 15 and 30c or 59- 86F

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 15 of this manual.

The SMT-131 uses a high-powered Maxim chipset that will “theoretically” permit the connection of up to 255 devices on a single Modbus node. RF noises and other interferences will reduce the real world permitted connections to a maximum of 150 ~ 200 in most cases.

Modbus and other communication protocol rely on the quality of cable and good installation practises to ensure reliable communications. Modbus requires the use of screen cable with the drain grounded in a single location.
When using a common power supply or when using a modbus master that also powers the SMT- 131, ensure the R (24v active), C (24v common) Data A & B wires are not crossed.
Hint! When the SMT-131 is connected to a working Modbus Network and receiving valid data, the decimal point in the temperature display will blink. If there is no communication or the SMT-131 is receiving corrupted data, this decimal point will remain on steady.

The Modbus data is provided in Addendum 1 at the back of this manual. (page 18 ).
Modbus relies on a series connection and will normally not tolerate “Star” wiring or “T” branches.

Remote Temperature sensors

Occasionally the room thermostat cannot be installed in the ideal location to measure the room temperature accurately. In these circumstances the SMT-131 can use optional remote temperature sensors. These are a two- wire resistive device,(10K Type II NTC) not polarity dependent and simply wired into the SMT-131 sensor inputs terminals (“SI” and “Com 0-V”). Depending on installer menu sensor settings, (shown on page 17) , remote sensor(s) will either override the SMT-131 onboard sensor or average with the onboard sensor.
Multiple sensors can be used for averaging over larger areas if necessary.
Wireless (RF) remote sensors are also available if fixed wiring cannot be installed economically. (P/N RS-W).

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 information card provided in the SMT-131 box provides details on how to enter the SMT-131 menu. If this is lost, please contact Smart Temp or an authorised distributor for support.

Navigating Through the Installer Mode Settings

The bottom right button steps forward through the menu options, the bottom left button steps you backwards.
Adjust your options with the up/down buttons.
Exit the menu saving changes by pressing and holding the bottom right or wait 3 minutes and the SMT-131 will automatically exit the installer menu.
The current menu option is shown between the left and right buttons. The example to the right shows option 3, select deg C (option 0) or F display (option 1).
Note. Option 3 in the installer menu described below sets the SMT-131 native temperature display format as deg C or Deg F modes. Temperature options in the installer options use the native temperature format.

Option List Table

| Option| Setting
---|---|---
0| Buttons Shown| 0: Both mode and fan buttons show (default)

1: Show mode but fan button hidden 2: Show fan but mode button hidden 3: Both mode and fan buttons Hidden

Note: If the mode button is hidden, the service and maintenance staff can turn the SMT-131 on or off by pressing and holding the lower left of the LCD for 15 seconds. 2 chirps indicate the SMT-131 has turned ON. 1 chirp indicates the

SMT-131 has turned off (ver 3.03+)

1| Permitted Modes| 0: Off / Auto

1: Off / Auto / Heat / Cool 2: Off / Heat /Cool

3: Off / Heat 4 Off / Cool

5: Off / Auto (Display current heating or cooling mode)

2| Room / Set display| 0: Show room and set temp (default)

1: Show set temp only

3| Native display format| 0: C (default)

1: F

4| C/F button shown on LCD| 0: Off(default)

1: On

Depending on Option 3 above.

Data format: Dead band * 10

8| Fan Purge / Run On Period| 0: OFF

1: Fan purge – 1 min

2: Fan purge – 3 min

3: Fan purge – 5 min

4: Fan purge – 10 min

5: Heat only fan purge – 1 min 6: Heat only fan purge – 3 min 7: Heat only fan purge – 5 min 8: Heat only fan purge – 10 min 9: Cool only fan purge – 1 min 10: Cool only fan purge – 3 min 11: Cool only fan purge – 5 min

12: Cool only fan purge – 10 min

9| Fan span| 0.5C-3.0C/1.0F-6.0F 0.1C/0.1F steps

Data format: Fan span * 10

10| 0-10V Fan Interval (PI)| 10-300 seconds 10 seconds’ steps (60 seconds default)
11| 0-10V Fan direction| 0: 0 – 10V – slow to fast (Forward Acting)

1: 10 to 0V – slow to fast (Reverse Acting)

12| 0-10V Fan minimum value (Starting fan voltage when

running)

| 0 -10V

Data format: 0-10V Fan minimum value * 10

13| 0-10V Fan Maximum value (Maximum  fan     voltage

when running)

| 0 -10V

Data format: 0-10V Fan minimum value * 10

14| Heat span| 0.5C-3.0C/1.0F-6.0F 0.1C/0.1F steps

Data format: Fan span * 10

15| 0-10V Heat interval (PI)| 10-300 seconds 10 seconds’ steps (60 seconds default)
16| 0-10V Heat direction| 0: 10V is 100% open (forward acting)

1: 0V is 100% open (reverse acting)

17| 0-10V      Heat      minimum

Voltage

| 0 -10V

Data format: 0-10V Heat minimum value * 10

18| Cool span| 0.5C-3.0C/1.0F-6.0F 0.1C/0.1F steps

Data format: Fan span * 10

19| 0-10V Cool interval (PI)| 10-300 seconds 10 seconds’ steps (60 seconds default)
20| 0-10V Cool direction| 0: 10V is 100% open (forward acting)

1: 0V is 100% open (reverse acting)

21| 0-10V       Cool      minimum

Voltage

| 0 -10V

Data format: 0-10V Cool minimum value * 10

22| Auto Off Timer| 0: No auto off timer

1-10hours 0.5 hour increments.

Data format: hour * 10

23| Un-occupied heat

Set point

| 0: OFF

5C-30C/41F-86F 0.5C/1F steps

24| Un-occupied cool

Set point

| 0: OFF

5C-30C/41F-86F 0.5C/1F steps

25| Un –Occupied fan mode| Fan 3 Speed mode

1: Low (Auto) (default) 2: Med (Auto)

3: High (Auto)

4: Low (ON)

5: Med (ON)

6: High (ON)

---|---|---
26| Backlight| 0: On with button press Only (Default > ver 3.1) 1: Always On high

2: Low when standby / high when active (Default < ver 3.1)

27| TT sensor (SI & Com)| 0: Remote – Use this sensor in place of the fitted sensor.

1: Average – Use both remote and fitted sensor and control to the average temperature of both sensors.

2: Data – Sensor value used for Modbus only.

3: Duct – Used for 2 pipe mode.

28| Temperature Calibration| +/- 10 deg (C or F)

Adjust to show correct room temp.

29| Digital Input| 0: Force Room to Unoccupied Mode 1: Chime Door Bell

2: Klixon Mode Enable

30| Digital Input Logic| 0: Normally Open

1: Normally Closed

31| Window Input Logic| 0: Normally Open

1: Normally closed

2: OFF (Input function disabled)

3:   Ver 3.3+ Show FLt (Fault) on LCD    (Toggles between

temperature display and “FLt”)

32| Window Input Delay| 0 – 300 seconds 30 seconds steps (30 seconds default)
33| Door Input Logic| 0: Off (default)

1: Normally open

2: Normally close

34| Door Input Delay| 0 – 300 seconds 30 seconds steps (180 seconds default)
35| PIR Input Delay| 0: Off (default)

1 – 15 minutes 1 minute steps (ver 3.3 changed 0-60min)

36| Reset Fan| 0: Off

1: On

(resets indoor fan to auto every time mode is set to off)

37| Belimo Mode| 0: Off 1: On
38| Modbus Address| 1-255
39| Baud rate| 1: 4800bps

2: 9600bps (default)

3:19200bps

40| Default Start Temp

Version Ver 3.3+

| 0=OFF (default) 15~35C or 59~86F
41| Beeper

Version Ver 3.9+

| 0: Off

1: On (default)

42| Fan Relay Lock (Version 40.1+)| 0:Off (default) 1: On

(This function locks the Fan relay logic to 0-10V outputs – if

enabled depending on other settings it may cause fan to start

1: Fast

2: Normal

3: Slow (Default)

4: Very Slow

44| Firmware Ver 41.1 +

2 Pipe heating threshold

| Range 5 to 50 (default 30c)
45| Firmware Ver 41.1 +

2 Pipe cooling threshold

| Range 5 to 50 (default 20c)
t| Temperature calibration Offset Ver 4.04+| -9.9c to +10c 0.0 (Default)

This permits you to apply a correction offset factor to the

room (or remote) temperature sensor used by the SMT-131.

r| Factory Reset| 0: NO

1:Yes (Exit to initiate)

Modbus Data – Addendum 1

The SMT-131 has integrated Modbus RTU communications. Using a Modbus master controller such as the Smart Temp 770-HMI many of the SMT-131 thermostat features can be centrally controlled and monitored.
Modbus is a simple protocol that is extremely popular due to its robustness and simple implementation. It is also a “forgiving” protocol and will tolerate many installation errors. This being stated however; correct wiring practices should be used to achieve maximum reliability. See page 10 for details on wiring Modbus networks.
The SMT-131 Modbus data is within the “40XXX” range, this being holding registers. Depending on your choice of Modbus Master you may need to enter the address using the full address – such as “40012” or by selecting “Holding Registers” and entering the address simply as “12”.
These modbus registers are shown as Base “1” (PLC addressing) format. Depending on your modbus master addressing format you may need to subtract 1 from these values to convert to base “0” (protocol addressing) format.
Note – The Modbus data layout may seem unorganised in this document, for example 0-10v for heat and cool is at register 40040 & 40041 while the 0-10V output for the fan is at register 40068. This is done to maintain backwards compatibility with the SMT-131 version 1 ModBus registers. All the new functions added to version 2 of the SMT-131 have their Modbus registers at the end of the version 1 SMT-131 Modbus register list.

Data Format

Protocol                           Modbus RTU (Slave)
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
---|---|---|---
40001| Read Only| Device ID| Always Returns “131”

Use as A Sentinel Point

40002| Read Only| Firmware Version| Divide By 100 (e.g. Version 2.36 = 236)
40003| Read Only| DIP Switch State| Binary Count

Sw 1 = 1, Sw2 = 2, Sw3 = 4, Sw 4 = 8 etc

40004| Read            /

Write

| Occupancy Status| 0 = Room is Unoccupied 1 = Room is Occupied

Note – Modbus can write “0” holding the room unoccupied regardless of the occupancy input.

Modbus cannot override the occupancy input

and hold the SMT-131 in occupied mode.

40005| Read Only| Bell Status| 0 = Bell Is Silent

1 = Bell Is Chiming

40006| Read            /

Write

| Door Station Status| 0 = Normal – No Activity

1 = “Make Up Room” Active

2 = “Do Not Disturb” Active

40007| Read            /

Write

| HVAC Status| 0 = Air Conditioning Off (1 or 3 Fan Speed)

1 = Low Speed Ventilation (1 or 3 Fan Speed) 2 = Med Speed Ventilation (3 Fan Speed Only) 3 = High Speed Ventilation (3 Fan Speed only)

4 = Air Conditioning ON (1 or 3 Fan Speed)

40008| Read            /

Write

| Fan Status| 3 Fan Speed Mode 0 = Low (Fan Auto) 1 = Med (Fan Auto) 2= High (Fan Auto)

3 = Auto Fan Speed (Fan Auto) 4 = Low (Fan On)

5 = Med (Fan On) 6 = High (Fan On)

7 = Auto Fan Speed (Fan On)

1 Fan Speed Mode

0 = Fan Auto

4 = Fan On

40009| Read            /

Write

| User Set Point| Deg C = 0.5°C Steps Deg F = 1°F Steps

Value / 10    ( e.g. 23.5°C = 235)

40010| 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 touching any button on SMT-131

40011| Read /Write (Read only

ver +4.04)

| Room Temperature| Value / 10 (e.g. 21.7c = 217)

(Writing to   the   room   temp   register   to

calibrate this value.)

---|---|---|---
40012| Read            /

Write

| Temperature

Display

| 0 = Show Room and Set Temperature

1 = Show Set Temperature Only

40013| Read            /

Write

| Native C/F Display| 0 = Deg C format

1 = Deg F format

40014| Read            /

Write

| User Set Point High

Limit

| 5°C to 30°C Range (41°F-86°F) in 1°C/F Steps

1:1

40015| Read            /

Write

| User Set Point Low

Limit

| 5°C to 30°C Range (41°f-86°F) in 1°C/F Steps

1:1

40016| Read            /

Write

| Dead Band| 0.5°C to 5.0°C in 0.5°C Steps 1.0°F to 10.0°F in 1°F Steps

Value / 10 (e.g. 1.5°C Dead Band = 15)

40017| Read            /

Write

| Relay Span| 0.5°C to 3.0°C in 0.5°C Steps 1°F to 10°F in 1°F Steps

Value / 10 (e.g. 1.0°C Span = 10)

Version 3 code has this function Inactive. Modbus will return valid data however this function is internally disabled. Register

provided for backwards compatibility only.

40018| Read            /

Write

| Fan Purge Period| 0 = Off

1 = Fan Purge – 1 Min 2 = Fan Purge – 3 Min 3 = Fan Purge – 5 Min 4 = Fan Purge – 10 Min

5 = Heat Only Fan Purge – 1 Min 6 = Heat Only Fan Purge – 3 Min 7 = Heat Only Fan Purge – 5 Min 8 = Heat Only Fan Purge – 10 Min 9 = Cool Only Fan Purge – 1 Min 10 = Cool Only Fan Purge – 3 Min 11 = Cool Only Fan Purge – 5 Min

12 = Cool Only Fan Purge – 10 Min

40019| Read            /

Write

| 0-10V Heat Span| 0.5°C to 10°C in 0.5°C Steps 1°F to 20°F in 1°F Steps

Value / 10 (e.g. Heat Span of 1°C= 10)

40020| Read            /

Write

| 0-10V Cool Span| 0.5°C to 10°C in 0.5°C Steps 1°F to 20°F in 1°F Steps

Value / 10 (e.g. Cool Span of 1°C = 10)

40021| Read            /

Write

| Auto Off Timer| 0 = 0ff

1 to 10 Hours. (0.5 hour steps)

Value / 10 (e.g. 3 Hour Auto Off Timer = 30)

40022| Read /Write| Unoccupied Heat Set Point| 0 = Off

5°C to 30°C in 1.0°C Steps

41°F to 86°F in 1°F Steps

40023| Read / write| Unoccupied Cool Set Point| 0 = Off

5°C to 30°C in 1.0°C Steps

41°F to 86°F in 1°F Steps

40024| 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 = Med (Fan On) 6 = High (Fan On) 1 Fan Speed Mode 0 = Fan Auto

4 = Fan On

---|---|---|---
40025| Read            /

Write

| Backlight| 0 = On with Button Press only 1 = Always On (High)

2 = Always On Low – High With Button Press

40026| Read            /

Write

| Remote “SI & Com 0-V Temperature Input Function| 0 = Replace On Board Sensor with Remote 1 = Average On board Sensor with Remote

2 = Modbus Use Only (e.g. Coil Temp Monitor)

3: 2 pipe monitor

40027| Read            /

Write

| Digital Input Function| 0 = Occupancy Initiate 1 = Chime Door Bell

2 = Input Disabled (Ver 3.09+)

40028| Read            /

Write

| Reset Fan Mode| 0 = Leave fan mode unchanged

1 = Reset fan to Auto at switch off

40029| Read            /

Write

| Belimo Mode| 0 = Standard 0-10V Valve Logic

1 = Belimo 6V = Off 3 Way Valve Logic

40030| Read            /

Write

| Modbus Address| 1 to 255
40031| Read            /

Write

| Baud Rate| 1 = 4.8Kbs

2 = 9.6kbs

3 = 19.2Kbs

40032| Read Only| Digital Input Status| 0 = Open

1 = Closed

40033| Read Only| Internal Sensor

Value

| Value / 10 (e.g. 23.3°C = 233)
40034| Read Only| Remote Sensor

Value

| Value / 10 (e.g. 21.8°C = 218)
Version 3.09+ firmware provides the ability for Modbus to override all the SMT-131 outputs. (5 x relays & 3 x 0-10v).

Note – To protect equipment functions the following rules apply.

To override register 40035 (W relay).

The anticycle timer must be OFF. (SW 5=Off).

To override register 40036 (Y relay)

The mode must be Heat Cool (Sw2=OFF) and the anticycle timer must be OFF. (SW 5 = Off)

To override register 40037 (High fan relay)

Single fan speed (Sw1=OFF) must be selected and the mode must be Heat Cool (Sw2=OFF)

To override register 40038 (Med fan relay)

Single fan speed (Sw1=OFF) must be selected and the mode must be Heat Cool (Sw2=OFF)

To override register 40039 (Low fan relay)

The mode must be Heat Cool (Sw2=OFF)

The 3 x 0-10V ( 40040 (Heat) , 40041 (Cool) & 40068 (Fan)) , outputs can be controlled by Modbus at any time without restriction.

To permit Modbus to control the output first enter 1000 in the register you wish to override, it is then unlocked from SMT-131 control and you are then permitted to enter the value you wish the selected output to be; such as 0=relay OFF and 1 1=relay ON or 63 should you wish the 0-10v to output 6.3v.

To return the output to SMT-131 control simply enter 1001 into the register.

Please Note – Writing to the relays or 0-10V output via Modbus bypasses the SMT-131 internal memory protection logic. Changing these values regularly via Modbus may reduce the thermostats memory life to only a few years. Using this function will void the SMT-131

warranty for the memory chip within the thermostat.

40035| Read Only Read Write (3.09+)| W relay status| 0 = Off (under thermostat control)

1 = Energised (under thermostat control) 1000 = Held OFF by Modbus

1001 = Held ON by Modbus

40036| Read Only Read Write (3.09+)| Y Relay Status| 0 = Off (under thermostat control)

1 = Energised (under thermostat control) 1000 = Held OFF by Modbus

1001 = Held ON by Modbus

40037| Read Only Read Write (3.09+)| High Fan Relay Status| 0 = Off (under thermostat control)

1 = Energised (under thermostat control) 1000 = Held OFF by Modbus

1001 = Held ON by Modbus

40038| Read Only Read Write (3.09+)| Medium Fan Relay Status| 0 = Off (under thermostat control)

1 = Energised (under thermostat control) 1000 = Held OFF by Modbus

1001 = Held ON by Modbus

40039| Read Only Read Write (3.09+)| Low Fan Relay Status| 0 = Off (under thermostat control)

1 = Energised (under thermostat control) 1000 = Held OFF by Modbus

1001 = Held ON by Modbus

40040| Read  Only Read Write

(3.09+)

| 0-10V Heat Value| Value / 10 (e.g. 7.3V = 73)

(To write add 10 e.g. – to write 7.3v send

1073

40041| Read  Only Read Write

(3.09+)

| 0-10V Cool Value| Value / 10 (e.g. 2.1V = 21)

(To write add 10 e.g. – to write2.1v send 1021

40042| Read Only| Permitted Modes (ver 2.1+ only)| 0 = Auto (Heating and cooling called) 1 = Heat Only Mode

2 = Cool Only Mode

Values below only apply to version 2 hardware only, Firmware version 3+
40043| Read            /

Write

| 2 pipe mode

changeover

| 0 = Heat

1 = Cool

40044| Read            /

Write

| Thermostat

Displaying

| 0 = Deg C

1 = Deg F

40045| Read            /

Write

| Buttons shown on display| 0: Both mode and fan buttons show (default) 1: Show mode but hide fan button

2: Show fan but hide mode button

40046| Read Write| /| Permitted Modes| 0: Off / Auto

1: Off / Heat / Cool / Auto 2: Off / Heat / Cool

3: Off / Heat 4: Off / Cool

5: Off / Auto – (display current mode in LCD)

---|---|---|---|---
40047| Read

Write

| /| Swap C/F display

shown on display

| 0: C/F Button hidden

1: C/F button shown

40048| Read

Write

| /| Fan Span| 0.5C-10 C 0.5C step 1.0F-20 F 1F steps

Data format: Fan span * 10

40049| Read

Write

| /| 0-10 Fan Interval| 10-300 seconds   in   10   second   steps

seconds default.

| (60
40050| Read

Write

| /| 0-10 Fan Direction| 0: 10V is 100% open (forward acting)

1: 0V is 100% open (reverse acting)

40051| Read

Write

| /| 0-10 Fan Minimum

Voltage.

| 0-10v (Fan value x 10)
40052| Read

Write

| /| 0-10 Heat Interval| 10-300 seconds   in   10   second   steps

seconds default.

| (60
40053| Read

Write

| /| 0-10 Heat Direction| 0: 10V is 100% open (forward acting)

1: 0V is 100% open (reverse acting)

40054| Read

Write

| /| 0-10 Heat

Minimum Voltage

| 0-10v (Heat value x 10)
40055| Read

Write

| /| 0-10 Cool Interval| 10-300 seconds   in   10   second   steps

seconds default.

| (60
40056| Read

Write

| /| 0-10 Cool Direction| 0: 10V is 100% open (forward acting)

1: 0V is 100% open (reverse acting)

40057| Read

Write

| /| 0-10 Cool Minimum

Voltage

| 0-10v (Cool value x 10)
40058| Read Write| /| Window input logic| 0: Normally Open

1: Normally closed

2: Off (input disabled)

3: Shows FLT (FAULT) shown on alternating with temperature display.

|

LCD

40059| Read

Write

| /| Window input

Delay

| 0-300 seconds in 30 second steps
40060| Read Write| /| Door input logic| 0: Off

1: Normally Open

2: Normally closed

40061| Read

Write

| /| Door input Delay| 0-300 seconds in 30 second steps
40062| Read

Write

| /| PIR input Delay

(Seek Time)

| 0: Off

1-60 minutes in 1-minute steps

40063

40064

| Read

Write

| /| Unit run time log| 0-9999.9 hours
Register 40063 & 40064 are to be used together to determine the total Heat & Cool run time in

0.1 hours.

For example, for a total run time of 15643.4 hours     register 40064 will show 434 and register

40063 will show 156

40065| Read Only| Window Input

Status

| 0: Open

1: Closed

40066| Read Only| Door Input Status| 0: Open

1: Closed

---|---|---|---
40067| Read Only| PIR Status| 0: No Movement detected

1: Movement detected

40068| Read Only Read Write

(3.09+)

| 0-10V Fan Value| Value / 10 (e.g. 2.1V = 21)

(To write add 10 e.g. – to write2.1v send 1021

40069| Read Only| 0-10V Fan Max

Value

| 0-10v (@*10)
40070| Read            /

Write

| Digital Input logic| 0: Normally Open

1: Normally Closed

40071| Read            /

Write

| Default Start Temp

Ver 3.3 firmware +

| 0: Off

15-35c     or 59-86F

40072| Read            /

Write

| Beeper| 0: Beeper OFF

1: Beeper On (Default)

40073| Read            /

Write

| Fan Relay Lock (Version 40.1+)| 0: Off (default)

1: On

This function locks the Fan relay logic to 0-10V outputs – if enabled depending on other settings it may cause fan to start and run before heat or cool calls from the W & Y

relays.

40074| Read            /

Write

| Temperature calibration offset (Version 40.4+)| -9.9 to +10c

This register permits the room temperature to be offset to correct for perceived room temperature sensor inaccuracies.

40075| Read            /

Write

| Temperature sensor  speed  of response.

(Version 40.4+)

| 0: Very Fast

1: Fast

2: Normal

3: Slow (Default)

4: Very Slow

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°C (32°F to 150°F) Size  =113 x 103 x 25mm.
Display Size                                       69.5 x 46.3mm.
Backlight                                            White LED (Other Colours Available Upon Request)
Display Type                                      STN Touch Panel
Relay Rating                                      30V @ 1Amp Max
0-10V Output Load                          10mA Max
Control Range                                   5°C to 30°C (41°F to 86°F)
Memory Type                                   Non-Volatile – Settings Do Not Require Battery Backup
Communications                              Modbus RTU 4 .8K / 9.6K / 19.2 K
1 Stop Bit, 8 Data Bits, 1 Start Bit. No Parity.
Plastic                                                 ABS / Poly Blend – UV Stabilised and Fire Rated
Warranty                                           3 Year RTB

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 specifications and in a safe manner.
Due to ongoing product improvement Smart Temp Australia P/L reserves the right to change the specifications of the SMT-131 thermostat (or its components) without notice.
All rights reserved. © Smart Temp Australia P/L 2011 Intellectual rights apply.

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