Smart temp SMT - 131 Manuel utilisateur

SMT - 131

Manual

Ver 2.1

Page 2

Revision History

Version 1 Original Document

Version 1.1 Added Mode select in Modbus

Version 2.0 Based on version 2 Hardware (firmware 3.0+)

Version 2.1 Added temperature calibration, DI logic and High fan limit.

Index

Index 2

Introduction 3

Thermostat operation 3

Installation - HVAC Control 4

DIP Switch Settings 5

Wiring –HVAC Control 5

0-10v Outputs 7

Belimo ™ 6 Way Valve 8

2 Pipe Mode 8

Ancillary Functions 9

Occupancy Detection 9

Doorbell 11

Outside Door Station 11

Modbus Wiring 12

Remote Temperature sensors 13

Installer Options Menu 13

Modbus Data –Addendum 1 16

Specifications 21

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Introduction

The Smart Temp SMT-131 thermostat has been designed for use in hotel rooms and other

locations where the user will require a thermostat that is simple to understand and functions in a

logical manner. Further, given the nature of the hospitality industry in general it is important that

the thermostat be very intuitive, robust 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 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 14)

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.

Page 4

Note. Option 16 in the installer menu (See page 15)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.

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.

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 located in a “typical” location where it will sense the accurate room

temperature and not be effected 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 entering the rear of the thermostat and effecting the room temperature

sensor.

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.

Page 5

DIP Switch Settings

Switch

Function

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

2 / 4 pipe mode

2 pipe mode

4 pipe Mode

Sw5

Comp Protection Delay

5 Min Anti Cycle

Immediate Compressor start

Sw6

Not Used

Sw7

Ventilation Mode

Permitted

Not Permitted

Sw8

Door Station (Optional)

Fitted

Door Station Not Used

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.

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

Terminal

Function

24V Neutral

24V Active - This voltage is switched back through the relays

Indoor Fan High Speed (NOT Used in Single fan speed mode - Sw 1 = 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)

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

Modbus Data A

Modbus Data B

Remote temperature sensor input (Remote / average / Modbus data use)

Digital (Switched input) for forced un-occupied or initiate doorbell function

Window Contact - Forces SMT-131 OFF if window open > 5 min (Adjustable)

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

Page 6

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. This damage is NOT covered by warranty. 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 the valves if needed.

Page 7

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 heating and cooling may have started slightly

before indicated on the 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.

Page 8

Maximum Value (Fan A3) output only

When controlling 0-10V fans sometimes it is necessary to limit the fan spped 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 14)

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 13 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 our other device).

2 Pipe Mode

The SMT-131 can measure pipe temperature via a remote sensor 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 mode selection is on, 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 26 “Si & Com 0-V” to option “3” – 2 Pipe Mode. (See page 15)

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.

Page 9

Ancillary Functions

The SMT-131 has a number of 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 of 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.

DO NOT APPLY EXTERNAL VOLTAGES TO THESE INPUTS

Page 10

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”

(page15)sets the window detection logic in the SMT-131.

Door Switch

The Door switch input (DS) is used by the SMT-131 for 2 functions.

1) To detect that the door has been opened and then closed to let somebody into or out

of the room.

2) To detect if the door has been left open.

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). The Installer menu 30 “Door Input

Logic” and option 31“Door Input Delay” (pageError! Bookmark not defined.)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 along with door switch data will determine the

occupancy status of the room and behave accordingly. Note, the PIR must be separately

powered, typically from a 12VDC supply.

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