Smart temp SMT - 131 Manuale utente

SMT - 131

Manual

Ver 1.1

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

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

has been designed with these important goals is mind.

The SMT-131 also offers advanced energy conservation features such as set point limit control,

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 “Door

Station” system.

Thermostat operation

The SMT-131 is an extremely simple thermostat to

operate and does not normally require a user

manual or user training.

The diagram to the left shows all LCD elements and

the 6 buttons (Up / Down / Make Up Room / Do Not

Disturb / On –Off / Fan Mode.

Depending on switch and installer menu settings

not all LCD segments maybe shown.

On/Off

Tap the On/Off button to turn the thermostat On or Off. (To ensure the simplest user operation

the user cannot select heating or cooling Mode directly).

Set Temperature

Adjust the target temperature with the Up or Down button.

Fan

Single fan speed mode (Sw1=Off)

Tap the fan button to cycle between auto fan and continuous fan mode.

Three fan speed mode (Sw1=On)

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 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 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

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 efficient and effective

manner.

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 and push in gently inwards and twist to release the case

locking clip. Gently pry the two case halves apart at the base taking

care not to twist the case too hard as this may crack the LCD.

Terminal Identification

B Modbus Data “B”

A Modbus Data “A”

0 0-10V Zero Volt Terminal

H 0-10V Heat Output

C 0-10V Cool Output

- 24V Common

+ 24V Active

W Heat (Or Reversing Valve)

Y Cool (Or Compressor) D- Digital Input 0 Volt

3 Fan –High Speed D+ Digital Input Active

2 Fan –Medium Speed S- Sensor Input 0 Volt

1 Fan –Low Speed S+ Sensor Input Active

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

Not Used

Sw5

Comp Protection Delay

5 Min Anti Cycle

No Anti Cycle

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.

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

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

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 Settings

Sw1 = Off - 1 Fan speed

Sw2 = Off - HC Mode

Sw3 = On/HE Off/HG

Sw4 = N/A

Sw5 = On - Comp Delay

Sw6 = Customer Pref

Sw7 = Customer Pref

0-10V Heating Valve With Cool - 1 Fan Speed

Switch Settings

Sw1 = Off - 1 Fan Speed

Sw2 = Off - HC Mode

Sw3 = On/HE

Sw4 = N/A

Sw5 = On - Comp Delay

Sw6 = Customer Pref

Sw7 = Customer Pref

Line Powered Cooling Valve - 3 Fan Speed

Switch Settings

Sw1 = On - 3 Fan Speed

Sw2 = Off –HC Mode

Sw3 = On/HE

Sw4 = N/A

Sw5 = Off - No Delay

Sw6 = Customer Pref

Sw7 = Customer Pref

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 on page 10 of this manual.

Given the SMT-131 provides 2 x 0-10V outputs, when in “Belimo Mode”, the heating 0-10V

output controls the Belimo valve while the cooling 0-10V output provides a signal to drive a fully

modulating fan should it be required.

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.

Wiring Examples –Ancillary Functions

Additional capabilities can be used when wiring the SMT-131 to external devices. These include

BAS, room occupancy detection systems, door card readers and the optional Smart Temp outside

door stations.

Complete System Overview

As can be seen by the diagram to the left, the SMT-131

is the hub of a sophisticated hotel room HVAC control

and management system.

Connecting the SMT-131 to an automatic occupancy

detection system such as the Smart Temp OC-3D

(optional) permits you to precisely control HVAC energy

consumption by automatically selecting a more

economical room set temperature when the room is

unoccupied.

The optional door station connects quickly and easily to

the SMT-131. This provides the hotel guest with the

ability to request privacy or call for housekeeping when

needed. A doorbell function is also provided.

Network communications enables the room to be

“turned on” remotely as a guest arrives and “shut

down” at checkout –further saving money on energy

costs.

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-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 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.

Modbus relies on a series connection and

will normally not tolerate “Star” wiring or

“T” branches.

Occupancy Input

When the room is detected “unoccupied” by a third party

device or the optional Smart Temp OC-3D occupancy

detection system, the SMT-131 will replace the user set point

with installer pre-set temperatures or alternatively, turn the

thermostat off. The user settings will return when the room is

again occupied.

The Digital Inputs in the SMT-131 are volt free. To initiate the

“unoccupied” function simply bridge the D+ and D- terminals

through a clean contact (switch or relay terminal).

DO NOT APPLY ANY EXTERNAL VOLTAGES TO THIS INPUT.

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 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 by the supplied 1 metre cable

fitted with RJ12 plugs. Longer cables up to 10 metres maximum can be supplied at extra cost.

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.

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 device,

not polarity dependent and simply wired into the

SMT-131 sensor inputs terminals. Depending on

installer menu sensor settings, shown on page 11,

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 wiring cannot be installed economically.

Doorbell

A built in doorbell feature is included with the SMT-131 thermostat. This is normally activated by

the optional outside door station or via Modbus data link. In circumstances where this is not

convenient, the digital input terminals can be

assigned as a doorbell switch with the digital

input options detailed in the installer menu on

page 11. Simply place a momentary volt free

switch across the S+ and S- terminals to

activate the doorbell. Once pressed, the

doorbell will chime for 10 seconds.

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 2 steps to enter the installer menu are:

This section is removed for the web version of this manual to protect the security of

the thermostat. This information is only provided to our service agents or selected

trade customers. Please contact Smart Temp for further information.

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 (fan button) or waiting.

The SMT-131 will exit this menu automatically after 20 seconds.

Option List Table

Option

Setting

User Temperature Display

0 = Show Room and Set temperature (Default)

1 = Show Set Temperature Only

Temperature Format

C = Degrees Celsius (Default)

F = Degrees Fahrenheit

High Set Point Limit

Off, then 5°C to 30°C (41°F to 95°F) (Default = 30°C)

Low Set Point Limit

Off, then 5°C to 30°C (41°F to 95°F) (Default = 5°C)

User Set Point Dead Band

0.5°C to 5°C in 0.5°C Steps (Default = 1°C)

Span (Relays - Hysteresis)

0.5°C to 3°C in 0.5°C Steps (Default = 0.5°C)

Indoor Fan Purge

0 = Off (Default)

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

Note - A 15 second fan purge is applied in all modes

0-10 Volt Heat Span

0.5°C to 3°C in 0.5°C Steps (Default = 1°C)

0-10 Volt Cool Span

0.5°C to 3°C in 0.5°C Steps (Default = 1°C)

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