Installer Manual
Contents
1. Commissioning For convenience the layout of this manual is in the same order as the steps listed above 4 Page Mounting the SMT 770 thermostat The SMT 770 can only be as accurate as the onboard temperature sensor or its optional remote temperature sensor s permit It is therefore essential that the SMT 770 be installed in a location that is typical of the ambient room temperature Do not install the thermostat in a draft near a floor behind doors or on a non insulated external wall Also avoid placing the thermostat in areas where the air movement is limited affected by direct sunlight or other areas not typical of the temperature of the room Further when mounting the SMT 770 is aware that drafts may travel down the inside of cavity walls especially if mounted on external walls and enter the back of the thermostat or sensor enclosure through the cable entry holes in the wall It is important to fully seal these holes to prevent any drafts affecting the internally mounted temperature sensor It is recommended to mount the SMT 770 or remote sensors between 1 5 amp 1 7 metres from the floor where possible Move the control wires through the large opening in the thermostat base plate then place the thermostat base on the wall and using appropriate screws firmly attach the thermostat base to the wall Block any holes where cables enter the back of the thermostat to prevent drafts entering through these holes affecting2. you should here faint clicks as the SMT 770 internal relays change the equipment fan speed should change accordingly Test heating and cooling if both fitted Turn the SMT 770 to Auto season change mode by tapping the mode button until the words Heat and Cool are shown on the LCD Using the temp A or Temp WY button set the desired temperature a few degrees below the ambient temperature After a few moments you will hear a click and the word Heat will change to Heating Verify that the heating system is on and operating 35 Page correctly If stage 2 heat is being called the full stop on the end of the word MODE will be seen to indicate 2 stage heat Stage 3 of heat is indicated by the full stop flashing Using the temp or Temp button set the desired temperature a few degrees above the ambient temperature After a few moments you will hear a click and the word Cool will change to Cooling Verify that the cooling system is on and operating correctly When stage 2 cool is being called the full stop on the end of word MODE mode will be seen to indicate 2 stage cool Tap the mode button turn the SMT 770 OFF After any necessary timers have expired all heating cooling and fan functions should stop Verify that the system has shut down Note in HP mode SW2 ON it is normal for the reversing valve to remain energised after the compressor has stopped This is
3. Established 1961 Installer Manual SMT 770 Chameleon Multifunction Thermostat DUNNAIR yx G Scart Temp S Svart Tanp Ver 3 0 Note DAT 770 is mode reference used by Dunnair SMT 770 and DAT 770 refer to same thermostat This document it not typically left with the user as it contains information on setting values which if not correctly set may damage the heating cooling or air conditioning system or seriously affect its performance or energy consumption Great effort has been taken to making the SMT 770 thermostat 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 This manual is to be used in conjunction with the supplied user manual 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 thermostat or the 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 770 thermostat or its components without notice All rights res
4. SMT 770 can use multiple sensors if required for averaging Drawings showing these various configurations are shown on page 37 of this manual 9 Page Outside Air Sensor Wiring Set TT OA in the advanced installer menu The SMT 770 can display the outside air temperature if SM 770 desired Some advanced control functions such as high T and low balance points rely on this sensor to be fitted T for correct operation Using a single pair of wires anononn connect the TT terminals in the SMT 770 to the two terminals in the Suicide air temperature sensor See figure 1 If the outside air sensor fails two dashes will be shown on the LCD where the outside air temperature would normally be displayed to alert you of the problem RS 01 Figure 1 RS 01 Remote Air Temperature Sensor Wiring Set TT RS in the advanced installer menu Default When you wish to measure the temperature from a T location distant from the SMT 770 simply connect a remote temperature sensor to the TT terminals in the SMT 770 This will automatically disable the sensor fitted to the SMT 770 and use the remote temperature sensor s to control the room temperature See figure 1 above Should you wish you can easily switch the remote temperature sensor on and off thereby switching temperature sensing locations between the remote temperature sensor and the SMT 770 temperature sensor when required Simply fit an inline switch in the senso
5. The lowest cooling value permitted to be set by the user Adjustable between 5 37c 41 98F CF C Temperature display Format Deg C or deg F display type effects all user and installer menu items C1i 0 0 Fitted Sensor Calibration Calibration offset for the internal sensor Adjustable range 4 5 deg C 9 F in 0 1 steps tC 12 Time Clock tC 12 12 Hour Time Clock tC 24 24 Hour Time Clock tC 0 No time clock shown Manual mode only SW6 off td 0 Temperature Display TD 00 The SMT 770 will display both the room amp set temperature TD 01 The SMT 770 will display set temperature only AH 2 After Hours Override Timer Start Stop Mode Commercial Thermostat Mode Sw6 on Sw8 off After hour run time period Adjustable range 0 off to 12 hours in 0 5 hour steps Setback 1 2 3 4 mode Residential programmable mode Sw6 on Sw8 on Temporarily program override period Off Override till next program change or 1 12 hours fixed time override 22 Page St Off Start Program temperature Commercial Mode Start stop mode Only Sw6 on Sw8 off This sets the default temperature that will be used each time the Start program begins regardless of any adjustments the user may have made previously Adjustable between OFF 15 35c 59 95F If set to off the user set point will not be automatically reset to a default value each day SC OFf _ Stop Cooling tempera
6. ange Back light Backlight life Adaptive recovery method Communications Protocol Fan speeds Approvals Warranty Sensor Reference Table 24VAC 50 60 Hz 15 24VAC 1Amp maximum per relay 0 50C 32 to 122F 0 95 non condensing 0 65C 32 to 150F 113 x 103 x 23mm 74x 55mm 10K NTC type 3 0 3deg C 25 C 77F Minimum temperature change over time method 5 90 minutes Off to 4 minutes Unlimited 30 10 or 6 Installer set 0 5 deg C 1F Off to 38c 100F 8 60c 17 140F Blue EL 3 000 hours to half brightness Time to start vs temp differential method updating ModBus contact Smart Temp for objects list Based on difference between room and set temp FCC Part 15 pending C tick 3 years RTB KQ 24 3 22 0 20 0 18 1 16 2 14 3 13 7 12 5 11 4 10 4 10 0 9 57 8 75 8 05 6 8 10 12 14 16 18 20 22 24 25 26 28 30 F 42 8 46 4 50 53 6 57 2 60 8 64 4 68 71 6 75 2 77 78 8 82 4 86 43 Page Troubleshooting Symptom Suspected Fault Suggested remedy Temperature display seems inaccurate Air from the wall cavity may be leaking into the rear of the thermostat sensor enclosure Plug holes in wall with tape to prevent leaks The internally fitted temperature sensor is folded back inside the Chameleon and not being exposed to the room air temperature Carefully move the room temperature
7. djacent wires Equipment wiring information can be found on page 12 of this manual A If using the ModBus communication capability of the SMT 770 ensure the A B amp T data wires are in the correct position as an error here may affect the communication of the entire network See page 38 for detailed wiring of the communications port of the SMT 770 Using masking tape or similar block the hole in the wall where the wiring enters the back of the thermostat to prevent drafts that may travel down the inside of the wall cavity affecting the accuracy of the internally fitted temperature sensor Figure 14 18 Page Remove and discard the plastic tab on the internally fitted backup battery so that the battery is now in circuit and operating Take care not to damage the battery holder when doing this When attaching the thermostat to the base avoid twisting the case as this may stress the LCD and cause it to crack Avoid running wiring near the internally fitted sensor Take care not to damage or crush the temperature sensor between the two half s of the case when you close the Chameleon case Check this sensor location Advanced Installer Settings The SMT 770 is fitted with many advanced functions that can be finetuned by the installer to specifically match the needs of the project of the user Normally these functions will not need to be altered from the factory default position however there may be times when
8. done to prevent de compression HISS and to limit the wear on the reversing valve 30 minutes after the last reversing valve use it will de energise to conserve power If commissioning mode has been used it is important that the function be turned OFF before handover to the user Using the User Manual as a guide set the real time clock and the preferred user programme if applicable Explain equipment amp thermostat operation to the user Commissioning is complete 36 Page Using Remote Temperature Sensors Figure 15 Single Sensor Twin Averaging Sensors Single or multiple room air temperature sensors can be connected to the SMT 770 TT terminals if temperature averaging over a larger area is desired 4 examples of commonly used sensor configurations are shown Note Either TT RS remote sensor or TT Av Averaging sensors value must be set in the advanced installer menu for these sensors to be used Four Averaging Sensors Please note the configuration of RS 01 amp RS 02 sensors in the examples provided above Other sensor configurations are also available 37 Page A typical maximum of 40 meters is permitted for sensor runs with unshielded cable If longer distances are required a larger diameter 0 3mm shielded cable should be used When used in Start Stop commercial programmable mode T SW6 on SW8 off the afterhours run timer can be toggled inline i P On Off on or off as r
9. e Y terminal s only for cooling Heat Pump systems use the Y terminal s for BOTH heating and cooling the compressor The W1 terminal to control the reversing valve which determines heating or cooling mode Switch 3 Equipment Stages When it is necessary to control a single stage A C system fitted with auxiliary heating elements turn Sw3 OFF thereby selecting single stage mode Heating elements controlled by the W2 output are now assigned as stage 2 heat Switch 4 Reversing Valve or Fan Mode When the SMT 770 is set for Heat Pump mode Sw2 is on then this switch sets the reversing valve logic O B When the SMT 770 is set for Heat Cool mode Sw2 is off then this switch sets the mode for the Heater fan logic HG or HE mode 7 Page Switch 5 Anti Cycle Timer To protect some A C systems it is preferred that under no circumstances should the compressor start within 4 minutes of it switching off Note when power is first applied to the SMT 770 it assumes that the compressor has just stopped and applies this anti cycle delay time before starting Switch 6 Thermostat Operation To suit the varying requirements of the user the SMT 770 can be set as a programmable thermostat using the time clock to automatically control the building temperature to a programmed temperature profile or to the very simple to operate manual mode where the user turns the thermostat on or off and adjusts the temperature se
10. equired with a momentary press button on the Si In line Override Switch remote sensor See figure 17 As the SMT 770 Auto detects sensors connected to the TT terminals temperature sensors can also be switched on and off as required by placing a switch in the sensor wiring to open circuit the sensor loop See figure 16 Figure 47 Figure 16 Advanced Functions ModBus Communications The SMT 770 has integrated ModBus communications capabilities where using a remote PC or building Direct Digital Control DDC system may view or adjust many of the SMT 770 functions remotely It is not the scope of this manual to provide detail on the communication capability of the SMT 770 Detailed ModBus communications detail is available for download from the download page at www thermostat com au 38 Page The communications port of the SMT 770 has 3 terminals used for communication A B amp T Terminals A amp B are used for data communication the terminal T a shared terminal from the thermostat T T input is used as a Vss screen ground to protect the integrity E To Network of the communication signal T Figure 18 A maximum of 32 SMT 770s can be connected to any single hub Each SMT 770 on the hub must have a unique network address factory default is 7 These settings are adjustable from the advanced installer menu See page 19 for more detail on setting the communicatio
11. erved Smart Temp Australia P L 2011 Intellectual rights apply 2 Page Table of Contents Installation Mounting the wall controller Setting the hardware switches TT Terminal Functions Outside Air Sensor wiring re Remote Air Temperature sensor wiring Averaging Temperature sensors Remote ON OFF function Using the Occupancy Mode Supply Air Temperature Monitoring Typical Drawings Attaching the thermostat Advanced Installer Settings Commissioning Using Remote Temperature Sensors Advanced Functions sssecssseee Specifications Sensor Reference Table Troubleshooting 3 Page Installation As with any air conditioning project undertaken careful installation is the key to a successful outcome Time taken during this installation process will be rewarded with a happy customer and fewer call backs The steps required to install the SMT 770 thermostat are Oy Ce on NE 8 Read and understand this manual and the User manual Mount the SMT 770 back plate in a suitable location Set the 8 DIP switches to match the need of the project user Wire the optional remote temperature sensor s or switches if required Power up the air conditioning system Set the installer software options if required Program and set up the SMT 770 thermostat The User Manual will assist with this Test the heating cooling and other functions
12. extremely tight temperature control can be achieved or a more energy efficient temperature control profile can be set In single set point mode sw8 off the individual heating and cooling set points are replaced by a Dead Band where the heating and cooling differential is controlled by a installer set value This is the simplest method of temperature control Further you are able to adjust how quickly the SMT 770 Chameleon thermostat responds to room temperature changes by adjusting the RS XX value in the installer menu The lower this setting the faster the thermostat will respond to room temperature fluctuations the larger this number the slower the thermostat will respond to changes in room temperature 33 Page Commissioning As with any thermostat commissioning ensures that the thermostat and the equipment connected to it are operating correctly and as expected Although the SMT 770 is a multifunctional thermostat commissioning is quite a simple process Follow the steps detailed below and use the troubleshooting guide on page 44 if you encounter a problem When the thermostat is fitted to the base plate and when 24VAC power is first applied the LCD should briefly show all available segments a LCD function test then display the software version number before showing the time and operating mode etc The SMT 770 is fitted with a number of safety and energy saving time delays If desired Lf these can be disabled
13. f 1 speed fan Sw2 On HP System Sw3 On Two Stage 7 Loll Sw4 On Heat B Off Cool O Com zav zsc p A y iN Sw5 Installer preference Sw6 User requirements Sw7 Installer preference Sw8 User requirements 1 1 Modbus See TT Terminals Port Options List E Heat Comp 21 RiValve Conp 1 Fan ji L Note Set W3 EH in the installer menu Equipment See TT Terminals Options List Figure 12 Switch Settings Sw1 Off 1 speed fan Sw2 Off HC System Sw3 Off Single Stage Sw4 Off HG Sw5 Installer preference Sw6 User requirements Sw7 Installer preference Sw8 User requirements Tip Set Installer menu Fn H 2 stage gas heat 2 stage add on cool See TT Terminals Options List Figure 13 Switch Settings Swi Off 1 speed fan Sw2 Off HC System Sw3 On Two Stage Sw4 Off HG Sw5 Installer preference Sw6 User requirements Sw7 Installer preference Sw8 User requirements 17 Page Attaching the thermostat Check that the position of the 8 DIP switches matches the requirements of the equipment being controlled and the specific requirements of the user Detailed information on the 8 DIP switches can be found on page 6 of this manual Check the wiring matches that of the equipment the SMT 770 is to control and that all wiring is tight and not likely to short between a
14. fault The reversing valve remains energised after the heating cooling has stopped to limit de compression hiss Reversing valve will de energise within 2 hours of the last call Spanner Symbol flashes on LCD This is not a fault Commissioning mode enabled Exit commissioning mode before handover to user See page 21 E Heat or E Heating is shown on LCD without manually selecting it This is not a fault LBP reached outside air too cold for reliable HP operation Set LBP with the LB XX value in the installer menu details on page 19 44 Page Symptom Suspected Fault Suggested remedy The word OFF is flashing in the LCD Mode button has no effect This is not a fault TT Of in advanced installer menu Some buttons do not appear to operate Padlock is show on LCD Key board lock is on LC XX value in advanced installer mode set the lock values see page 19 Cannot enter heat or cool modes SMT 770 thermostat set for Heating or cooling only modes Heating or cooling mode not available on your air conditioning system Cannot set heating and cooling to desired value Padlock symbol flashes This is not a fault HL XX heating set point limit and CL XX cooling set point limit restrict control range See page 19 for more detail Outside Air Temp display is showing dashes Outside air temperature air sensor has failed Check wiring and outside air sens
15. ference Sw6 User requirements Sw7 Installer preference Sw8 User requirements 1 stage heat pump 1 speed fan Switch Settings Sw1 Off 1 speed fan Sw2 On HP System Sw3 Off One Stage Sw4 On Heat B Off Cool O Sw5 Installer preference Sw6 User requirements Sw7 Installer preference Sw8 User requirements Note Set SW4 to suit the system Modbus See TT Terminals Options List Figure 8 Switch Settings Swi Off 1 speed fan Sw2 On HP System Sw3 Off One Stage Sw4 On Heat B Off Cool O Sw5 Installer preference Sw6 User requirements Sw7 Installer preference Sw8 User requirements Note Set SW4 to suit suit the system 1 stage heat pump 3 speed fan 24 24C B A T T Link Forrof Rvne coro f R e tefl ie i Equipment Figure 9 15 Page 1 stage heat pump with auxiliary heat Switch Settings 1 speed indoor fan Sw1 Off 1 speed fan Sw2 On HP System ENE Sw3 Off One Stage BA wi v E Ry 2ay aac BIA T T Sw4 On Heat B Off Cool O k Sw5 Installer preference Sw6 User requirements Sw7 Installer preference Factory Link Aux Heat R Valve com Fan R E Moys ag Triinul Sw8 User requirements J T Note Set SW4 to suit the Equipment system Figure 10 Switch Settings 2 stage heat pump with emergency heat Sw Of
16. for commissioning purposes by entering the installer mode and setting the CD 00 value to read CD 01 After exiting the installer menu you will note a Spanner icon flashing on the LCD to remind you that commissioning mode is Active After commissioning has been completed it _is important to disable commissioning mode by entering the installer menu once again and setting the CD 01 value back to CD 00 Note when in commissioning mode ALL time delays are either OFF or reduced to a extremely low value it is therefore normal to potentially call for 3 stage heating almost instantly 0 5deg below the heating set point 34 Page If you choose not to use commissioning mode you may see various words and Icons flashing in the LCD whenever a time period is in use For example the word HEAT may flash to indicate heating is required but being held off by the 4 minute anti cycle timer Or the word HEATING may be flashing to indicate set point has been achieved however heating is being held ON by the minimum run timer The golden rule with the SMT 770 is anything that flashes is a timer overriding what would normally be expected to occur either a function is being held on or off momentarily Please be patient Test fan operation With the thermostat OFF tap the mode button to show OFF in the LCD Simply tap the fan button to cycle through the available fan speeds As the LCD changes to show the fan speed or fan mode
17. h and Low balance points The SMT 770 is fitted with both High and Low Balance Point control capability For these functions to operate the Installer setting must be TT OA outside air temperature sensor fitted the outside air sensor must be installed and SW1 must be OFF Single fan speed mode High Balance point Set the installer menu value HB XX When the outside air temperature is above this value second or third stages of heating are held off regardless of the room and set temperature Set this function is designed to prevent the excessive consumption of energy for heating when the outside air temperature is warm Low Balance point SW2 on H3 EH Emergency Heat Mode Set the installer menu value LB XX When the outside air temperature is below this value the SMT 770 will automatically switch to emergency heat mode when heating is required If the outside temperature is above this LB XX value the emergency heat mode can be selected manually at anytime with the MODE button Setting up the Heat amp Cool Off functions To conserve energy the SMT 770 can suspend the heating or cooling functions if the outside air temperature is within a prescribed installer set range 41 Page If the outside air temperature is above the HO XX heating OFF value heating will not be called regardless of the room and set temperature If the outside air temperature is below the CO XX value cooling will not be called regardless of t
18. he room and set temperature Heat or Cool and the word Locked will flash on the LCD to show that these modes have been restricted Adaptive recovery Only available in programmable mode sw6 on The adaptive recovery function of the SMT 770 permits the user to program a time that a desired set temperature is required letting the thermostat calculate the most energy efficient time to turn on to achieve the desired temperature at the selected time If the user typically returns home at 5 00pm at the end of the work day setting program 3 if used in residential programmable mode to 5 00pm the SMT 770 will calculate the most energy efficient time based on the set and room temperatures as well as a history of temperature change to bring on the equipment prior to 5 00pm to meet the desired set temperature by 5 00pm For example when heating is required the heating may start at 4 32pm so that the set temperature is reached at 5 00pm Adaptive recovery may also prevent the SMT 770 from running for a few moments just prior to a program change occurs RECO is shown in the LCD when ever Adaptive recovery is being used 42 Page Specifications Input Voltage Relay rating Operating Temperature Operating RH Storage Temperature Size Display Size Temperature Sensor s Accuracy Stage Delays Timed upstage Delay Anti cycle Delay Maximum hourly cycles Display resolution Control Range Outside Air temp display r
19. me set points FO 3 Available only if in Programmable Mode Sw6 on This mode is the combination of option 1 and option 2 given above FP 0 Fan Purge Time Period Fan run on If fan mode is Auto Fan the indoor fan will run for FP XX minutes after heating or cooling has stopped to extract any stored energy in the coils etc Necessary for electric element heating Adjustable between off to 5 minutes in 1 minute intervals 24 Page Fn A Function Available Equipment Modes FN A Select if controlling a Heating amp Cooling system FN C Select if controlling a Cooling only system disables heating menus FN H Select if controlling a Heating only system disables cooling menus FN Dash This mode will set SMT 770 to Heat only Cool only or OFF Emergency heat will also be selectable if fitted H3 Of W2 relay Function Only operates in single fan speed HP mode Sw1 off amp Sw2 on H3 Of W2 relay is used as 2nd or 3rd stage Auxiliary heat H3 EH W2 relay is used to control an Emergency Heating system H3 AH W2 relay is used to control a Add On Heat system H3 FF SMT 770 set up in Fossil Fuel Mode Comp stops with Aux heat H3 AL SMT will permit both Aux heat amp E Heating mode both use W2 relay 25 Page tt RS TT terminal Function see page 9 for more detail on this function tt OA Connect the outside air temperature sensor to the TT ter
20. minals to display the outside Air Temperature Required for all outside air control functions to operate tt RS Connect the remote room temperature sensor to the TT terminals to measure the temperature at a remote location away from the SMT 770 Note This completely disables the temperature sensor fitted to the SMT 770 tt AV The TT terminals will average the temperature measured by the SMT 770 internal sensor and remote room temperature sensor s tt OF A closed contact on the TT terminals will switch the SMT 770 On or OFF More detail on this function provided on page 11 of this manual tt OC A closed contact on the TT terminals will switch the SMT 770 to Occupied Mode where the oC amp oH temperatures will replace the user set temperatures See page 11 of this manual for more detail on this function tt DA The SMT 770 will broadcast the measured temperature from the remote temperature sensor via ModBus It will not display this value on the LCD nor is it used for any control option This mode is intended to provide system feedback to the ModBus master only tt 2p The function is intended for controlling a 2 pipe fan coil The mode of the thermostat heating or cooling will be determined based solely on the temperature as measured by the remote sensor The remote sensor RS 1D is typically strapped to the fan coil water supply line The mode button only permits the user to select OFF or ON where on is ei
21. mp Oh Occupied Heating value settings will be used to control the room temperature 11 Page Supply Air Temperature Monitoring Set TT DA in the advanced installer menu In this mode the SMT 770 will broadcast this sensor temperature value to ModBus ONLY this value is not used by the SMT 770 nor is it displayed on the LCD It is expected that this information is used for supervisory functions or equipment control feedback Also as this is an analogue input by monitoring a switched resistor network your supervisory software can decode a number of digital states Typical Drawings The SMT 770 has the capacity to control a wide selection of heating cooling and air conditioning systems Using the 8 DIP switches and many installer software options the SMT 770 is capable of providing many different control methods from its 5 fitted relays Examples of only the most common types of control wiring have been provided below You may need to modify these drawings slightly to specifically suit your individual needs alternatively contact Smart Temp at support smarttemp com au or an authorised distributor for installation information specific to your application 12 Page Heat only system with fan control 1 1 1 1 1 w2 Y2 Rly G3 2 jw Y1 ct Com zav zac B A g T k k H Factory Link C O T Sea aaa 1 Modbus See TT Terminals Heat Fan c Port Opti
22. ns address A typical ModBus wiring example is given below If using a common power supply to power all thermostats on a network it is highly recommended that all thermostats power is wired in phase i e R to R and C to C and NOT crossed Master Figure 19 B At Vss Gnd Additional Thermostats In many cases where multiple thermostats are used in a single network or on a long network run the two DIP switched located between the R amp R Com terminals on the thermostat PCB should be switched on to improve network reliability 39 Page It is essential that the network be wired as a daisy chain as shown in fig 20 Correct Figure 20 Fig 21 amp 22 show examples of how NOT to wire a ModBus network Short communication runs 1mm 18 gauge twisted SMT 770 pair unshielded wire can be used however for Incorrect longer runs or where electrical noise may be present twisted pair with shield should be used Figure 21 Incorrect Factory Test Mode The SMT 770 is fitted with a simple factory Test Mode where you can confirm that all relays outputs functions and the current configuration of the thermostat Ts 0 Factory Test Function is OFF Ts 1 Display DIP switch configuration code Ts 2 Relay test mode All relays cycle on then off in an endless loop Ts 3 Factory Software reset Press Fan button to confirm Figure 22 40 Page Hig
23. on tt OA the outside temperature sensor must be fitted and Sw 1 off 2nd or 3rd stage heating is locked out when the outside air is above this temperature Adjustable between 0 37c 32 98F LB 9 5 15f Low Balance point See page 40 for more information tt OA the outside temperature sensor fitted H3 EH Sw 1 off and Sw2 on Outside temperatures below this value will automatically select Emergency Heat mode Adjustable between 9 5 25c 15 77F Ft off Filter warning time Return air filter cleaning warning time Adjustable between off and 900 hours Ad 07 _ ModBus Address See page 38 for more information ModBus communications address Bd 9 6 ModBus Baud Rate Bd 4 8 ModBus baud rate is 4 800 Baud Bd 9 6 ModBus baud rate is 9 600 Baud Bd 19 2 ModBus baud rate is 19 200 Baud 30 Page Cd 01 Commissioning Mode See page 38 for more information Cd 0 Commissioning mode is OFF Cd 1 All time delays are off or reduced to a very small value SS 0 Start Stop Mode Override Typically used by ModBus Master SS 0 User Start Stop program in use SS 1 Thermostat held in Start program typically via call from ModBus master SS 2 Thermostat held in Stop program typically via call from ModBus master OF Override Function Typically used by ModBus Master OF 0 The SMT 770 will control its own relays Default OF 1 The 5 SMT 770 relays a
24. ons List i i 3 Equipment i Figure 4 Switch Settings Sw1 Off 1 speed fan Sw2 Off HC System Sw3 Off Single Stage Sw4 Off HG Sw5 Installer preference Sw6 User requirements Sw7 Installer preference Sw8 User requirements Tip Set Installer menu Fn H Cool only system with 1 speed fan 4 4 1 1 4 w2 Y2 Rly A 2al wi 1 G1 Com zav 24c B A T T Factory Modbus See TT Terminals Cool Fan R Port Options List Figure 5 Switch Settings Sw1 Off 1 speed fan Sw2 Off HC System Sw3 Off Single Stage Sw4 N A Sw5 Installer preference Sw6 User requirements Sw7 Installer preference Sw8 User requirements Tip Set Installer menu Fn C 13 Page 1 heat with add on cool 1 i i w2 Y2 Riy G3 a wi Y1 G1 Ea zv zc e alr r Figure 6 Modbus See TT Terminals Port Options List Switch Settings Sw1 Off 1 speed fan Sw2 Off HC System Sw3 Off Single Stage Sw4 Off HG Sw5 Installer preference Sw6 User requirements Sw7 Installer preference Sw8 User requirements 2 stage gas heat 1 stage add on cool 1 1 1 1 w2 Y2 G3 G2 zav aac 8 a r See TT Terminals Options List Figure 7 Switch Settings Sw1 Off 1 speed fan Sw2 Off HC System Sw3 On Two Stage Sw4 Off HG Sw5 Installer pre
25. ooling stages the SMT 770 will wait the minimum Su value before bringing on extra stages This delay provides time for the thermostat to determine whether additional stages are needed or if the current stages will bring the room to set point in a reasonable period of time dt 30 Upstage delay time Time in minutes before next stage of heating or cooling is to be called Delay only operates if stage trip temperature has not yet been reached Adjustable between 10 90 Minutes in 5 minute steps oS 0 Optimised Start stop Adaptive Recover OS 0 Optimised start stop function Off OS 1 Optimised start stop function running See page 42 for more information on this function C2 0 0 Calibration Remote Sensor 28 Page Calibration Offset for the TT terminal temperature sensor Adjustable range 4 5 deg C 9 F Co 5 41F Cooling OFF temperature See page 41 for more detail Only operates if tt OA and outside temperature sensor is fitted Outside air temperature below this value will force the cooling function OFF Adjustable between 0 37c 32 98F 29 Page Ho 35 95F Heating OFF temperature See page 41 for more detail Only operates if tt OA and outside temperature sensor is fitted Outside air temperature above this value will force the heating function OFF Adjustable between 0 37c 32 98F HB 37 98F High Balance Point See page 40 for more informati
26. or Replace outside air sensor No outside air sensor fitted Change TT AO to TT RS in advanced installer menu Heat or Cool is flashing in the LCD Heating or cooling has not started This is not a fault Heating or cooling will start shortly Anti cycle delay in progress This can be disabled if required for commissioning See page 21 The Fan runs on for some time after the heating or cooling stops even when turn the SMT 770 OFF This is not a fault The fan purge mode is set FP XX value SMT 770 displays wrong mode C or F The SMT 770 can operate in both Deg C and Deg F mode as set in installer menu See page 19 for changing the CF XX value Cannot select multiple fan speeds SMT 700 set for single fan speed Sw OFF Turn SW1 to ON NOTE 3 fan speed mode can only be used on single stage systems 45 Page Smart Temp Head Office Email info smarttemp com au Unit 20 1488 Ferntree Gully Road Web www smarttemp com au Knoxfield 3180 Victoria Australia Phone 61 3 9763 0094 Fax 61 3 9763 0098 This product has been manufactured by Smart Temp Australia Intellectual rights apply all rights reserved This product is Patent Pending 46 Page
27. r wiring or order Smart Temp part number RS 015 sensor See Figure 2 SMT 770 Switch Figure 2 10 Page Averaging Temperature Sensors Set TT AV in the advanced installer menu The SMT 770 can average the sensed temperature equally between the remote temperature sensor s and the one fitted to the SMT 770 if required See figure 1 on the previous page for details on wiring the sensor The SMT 770 will auto detect this sensor and automatically average the two sensors values to control the room temperature SMT 770 On OFF Switch Remote ON OFF Function TH T Set TT OF in the advanced installer menu Figure 3 The SMT 770 can be connected to an external dry contact When this contact is closed the SMT 770 will turn OFF See figure 3 When the SMT 770 has been switched OFF via the TT terminals the word OFF will flash in the LCD to indicate that this has been the shutdown method The SMT 770 will return to the user settings when this switch is open Using the Occupancy Mode Set TT OC in the advanced installer menu The SMT 770 can alternate between the user preferred set points and an installer pre programmed set point when required Simply wire a remote switch to the SMT 770 TT terminals see figure 3 When the switch is open the user settings will control the room temperature When the switch is closed the Installer Oc Occupied Cooling value a
28. re being controlled via a ModBus master only No buttons will function and all programming and control information is suppressed The word Override will flash on the LCD during this mode The SMT 770 will automatically exit this mode if no valid ModBus signals have been received for 5 mins RS 40 Thermostat sensor response time to room temperature changes Adjustable from RS 10 very fast to RS 90 very slow Default is RS 40 tS 0 Factory test mode See page 40 for more information TS 0 Factory test Mode OFF TS 1 Display configuration code TS 2 Step cycle all relays in sequence 12 3 4 5 etc TS 3 Reset software to factory default Press Fan button to initiate this table is available from the download section at www thermostat com au 31 Page 32 Page Control logic Single Set Point mode Two Set Point mode This simple diagram right Cool Stage 2 On Cool Stage 2 On provides a general insight Coo Stage 1 on Cool Stage 1 On into the control logic of the Cool OFF Cool Set point Cool OFF SMT 770 thermostat It Set Point attempts to describe the Heat OFF gme Heat Set point Heat OFF action of the DB XX the Heat Stage 1 On H n pan t Heat Stage 1 On SP XX and SD XX advanced Heat Stage 2 On I Heat Stage 2 On installer control capabilities in both two set point and single set point mode By adjusting these three values to suit the needs of the user or equipment
29. red PIN for future entry into the Installer menu Range 00 to 99 in 01 steps To prevent accidental PIN changes you must press and hold the A or W buttons for longer than 1 second to change the PIN value Caution if you change this value and forget your new PIN you may need to return the SMT 770 to place of purchase for unlocking there may be a fee for this service LC 0 Keyboard Lock level Programmable Mode SW6 ON LC 00 Key board Lock OFF LC 01 All buttons are locked except the Temperature buttons LC 02 All buttons are locked except the O Ride button amp Temp buttons LC 03 Fan and Program buttons are locked LC 04 Fan Program and Override buttons are locked LC 05 All buttons locked except O Ride LC 06 All Buttons locked Manual Mode SW6 Off LC 00 Key board Lock OFF LC 01 All buttons are locked except the Mode button LC 02 All buttons are locked except the Mode and temperature button LC 03 Fan amp O ride buttons are locked Mode button can only select Auto Heat amp Cool and off LC 04 O Ride Button is locked Mode button can only select Auto Heat amp Cool and off Note the temp buttons range can be limited in the HL amp CL menu 21 Page HL 49 120F Heating Limit or High Limit The highest heating value permitted to be set by the user Adjustable between 0 35c 32 95F CL 5 41F Cooling Limit or Low Limit
30. sensor bead so that it is just behind the sensor opening in the case External heat or cool source such as lamps televisions or drafts from open doors affecting the accuracy of sensor Move lamps vents or other sources of abnormal temperature away from sensors Sensor calibration may setting are incorrect Adjust C1 XX value in installer mode to correct perceived sensor inaccuracy Page19 Locked appears on LCD and heating or cooling will not operate This is not a fault Outside air temp to high to require heating Outside air temp to low to require cooling The Ho XX amp or Co XX value is inhibiting heating or cooling calls Change these values in the installer menu details on page 19 Heating or cooling runs in dead band SMT 770 incorrectly set to HP mode SMT 770 keeps reversing valve energised after heating cooling has stopped to limit decompression noise from AC system Set SW2 OFF and retest heating amp cooling operation Minimum run period has not yet expired Words Heating or Cooling flash in the LCD Sw7 sets minimum run period from 2 or 6 minutes Compressor and reversing valve wiring crossed in HP mode sw2 on Check W1 amp Y1 Y2 for correct connections SMT 770 has no display Power failure or faulty SMT 770 Check for 24VAC on the 24 amp 24C terminals Reversing valve remains energised after heating or cooling has stopped This is not a
31. t point manually Switch 7 Minimum Run Time To conserve energy and protect the A C system it is recommended to limit the number of times the heating and or cooling system can run in 1 hour This switch sets the minimum heating and cooling equipment to a minimum run time of 2 or 6 minutes Once the heating or cooling has started it must run for this minimum set time The LCD will flash the word Heating or Cooling whenever this timer is in effect 8 Page Switch 8 Thermostat Control Logic This switch also has two functions based on the position of switch 6 When the SMT 770 is set as a programmable thermostat switch 8 determines whether a commercial program or residential program is selected When switch 6 has the SMT 770 used as a non programmable thermostat this switch sets single set point mode imitating a simple mechanical thermostat or whether a separate heating and cooling set point can be selected by the user Two set point mode also permits the user to select a separate day and night set point if required TT Terminal Functions The SMT 770 is fitted with a set of terminals marked TT Details on the functions that the TT terminals perform is provided below See the advanced installer setting menu on page 19 of this manual for setting the function of this set of terminals The wiring used in the following examples are not polarity dependent and do not normally require screened cable Note The
32. the sensor 5 Page Setting the hardware switches Switch Off On Sw1 Fan Speeds 1 Speed Fan 3 Speed Fan Sw2 Equipment Type Heat Cool Heat Pump O B terminals Sw3 Stages 1 Stage 2 Stages Sw4 Reversing Valve If Sw 2 ON Heat Pump Sw4 Fan Mode If Sw 2 OFF Heat cool Energise in cool O Energise in heat B Fan Control by Heater HG Fan Control by T stat HE Sw5 Anti cycle timer Off 4 Minutes Sw6 Operation Manual Thermostat Programmable Thermostat Sw7 Minimum Run 2 minutes 6 Minutes Sw8 Program Type If Sw 6 ON Programmable Sw8 Set points If Sw 6 OFF Manual Commercial Program Residential Program Single Set point Two Set points A 6 Page Typical drawings have been provided on page 12 of this manual that will assist with the selection of the correct positions for these function switches Switch 1 Relay Assignment The SMT 770 is fitted with 5 relays capable of switching up to 24VAC 1Amp Switch 1 sets the function of these relays as either 3 fan speeds with 1 heat and 1 cool operation or single fan speed with 2 heat and 2 cool in either HP heat pump reverse cycle or HC heat with add on cool mode Switch 2 Equipment Type Both heat with add on cool or heat pump types of systems can be controlled by the SMT 770 Heat Cool System uses the W terminal s only for heating and th
33. ther heat or cool mode based on the remote sensor temperature 26 Page AF 0 Anti Freeze Function AF 0 Antifreeze function off AF 1 Room temperature will not be permitted to fall below 5c 41F oH Off Occupied Mode Heat Set see page 11 for more information Only operates if TT OC This is the heating temperature that will be used in Occupied mode and will temporarily replace the user heat set point while the TT terminals are shorted together Adjustable range 0 35c 32 95f oC OFf Occupied Mode Cool Set see page 11 for more information Only operates if TT OC This is the cooling temperature that will be used in Occupied mode and will temporarily replace the user cool set point while the TT terminals are shorted together Adjustable range 5 37c 41 98f SP 2 Stage 1 Span See page 33 for an overview of this control function Hysteresis for Stage 1 difference between heating and cooling turning on and off Sp 1 0 5c SP 2 1 0c Sp 3 1 5c 27 Page Sd 2 Stage 2 Span See page 33 for an overview of this control function Hysteresis for Stage 2 difference between heating and cooling turning on and off Sd 1 0 5c Sd 2 1 0c Sd 3 1 5c 3 2 Stage 3 Heat Span When set to 2 stage heat pump this value sets the span for the 3rd stage heating SU 10 Smart Upstage When the room temperature is far enough from the set temperature to call extra heating and c
34. ture Commercial Mode Start stop mode Only Sw6 on Sw8 off Cooling temperature that will be maintained when running the STOP program Night Setback Adjustable between 5 37c 41 98F OFF SH OFf Stop Heating temperature Commercial Mode Start stop mode Only Sw6 on Sw8 off Heating temperature that will be maintained when running the STOP program Night Setback Adjustable between 5 35c 41 95F OFF db 0 5 1 Single Set Point Dead band See page 33 for more information Dead band between heat and cool set point when in single set point mode sw8 off Adjustable between 0 and 5 deg in 0 5 c steps 23 Page Fo 0 2 Fan Options Advanced Fan Functions This function is only enabled when the selected fan mode is Fan On FAN ON will be displayed in the LCD to confirm this mode FO 0 Default Residential mode The fan will run continuously 24 hours a day 7 days a week FO 1 The fan will continue to run after the cooling stops to ensure the maximum fresh air ventilation and to aid in cooling The fan will stop after the heating stops This is done to prevent cold drafts that may occur on cold days when A C system is heating FO 2 Default in Start Stop Mode Available only if in Programmable Mode Sw6 on The Fan will Run continuously from program 1 or Start Program to program 4 or Stop program and then run in AUTO mode overnight to maintain the night ti
35. you wish to alter a setting or control capability so that the SMT 770 performance will perfectly match a particular application On the next few pages there is detailed explanation of these functions and their range of control While in the advanced installer menu all SMT 770 equipment control functions will be suspended Normal equipment operation will continue when you have exited this menu after any anti cycle delays or safety delays have terminated 19 Page Entering the Installer Menu To enter the Installer menu press and hold the O RIDE button for 15 seconds After 15 seconds the LCD will show 88 15 eight eight one five Adjust this value to 88 21 eight eight two one the factory default PIN or your previously selected value by using the up A or down V button Tap the O RIDE button to enter the menu If you have entered the correct PIN you will be given the first menu option if you have entered an incorrect PIN you will be exited from this menu Using the Installer Menu To move forward through the Installer menu items tap the O RIDE button To move backwards through the Installer menu items tap the PROG button To adjust a value in the Installer menu tap the A or down V buttons To exit the installer menu tap the Mode button the Fan button or wait 60 seconds Default Installer Values are shown in the examples below 20 Page PN 21 Keyboard Lock PIN This is the requi
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