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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 ...
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 by a happy customer and fewer call‐backs. The steps required to install the SMT‐770 thermostat are 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). ...
Mounting the wall controller 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 wall thermostat 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, ...
Setting the hardware switches Switch On Sw1 – Fan Speeds 1 Speed Fan 3 Speed Fan (2 heat / 2 Cool) (1 heat / 1 Cool) Sw2 – Equipment Type Heat Cool Heat Pump (O/B terminals) Sw3 – Stages 1 Stage 2 Stages Sw4 – Reversing Valve Energise in cool (O) Energise in heat (B) If Sw 2= ON – Heat Pump Sw4 – Fan Mode Fan Control by Heater (HG) Fan Control by T’stat (HE) If Sw 2= OFF – Heat/cool Sw5 – Anti cycle timer 4 Minutes Sw6 – Operation Manual Thermostat Programmable Thermostat Sw7 – Minimum Run 2 minutes 6 Minutes Sw8 – Program Type Commercial Program Residential Program If Sw 6= ON – Programmable Sw8 – Set points Single Set point Two Set points...
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Switch 1 – Relay Assignment The SMT‐770 is fitted with 5 relays capable of switching up to 24VAC @ 1Amp. Switch 1 sets the function 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 or 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. ...
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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 ...
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 ...
Outside Air Sensor wiring Set “TT= OA” in the advanced installer menu. RS-01 SMT-770 The SMT‐770 can display the outside air temperature if desired. Some advanced control functions such as high and low balance points rely on this sensor to be fitted Figure 1 for correct operation. Using a single pair of wires connect the “TT” terminals in the SMT‐770 to the two terminals in the outside 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 ...
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 ...
Typical Drawings The SMT‐770 has the capacity to control a wide selection of heating, cooling and air conditioning systems. Using the DIP switches and installer software options, the SMT‐ 770 is capable of providing more than 96 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 to specifically suit your individual needs ...
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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 Figure 5 Switch Settings Sw1 = 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 Figure 6 13 | P a g e ...
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Switch Settings Sw1 = On (3 speed fan) Sw2 =On (HP System) Sw3=Off (One Stage) Sw4= Equipment Specific On = B Off = O Sw5= Installer preference Sw6= User requirements Sw7= Installer preference Sw8= User requirements Figure 7 Switch Settings Sw1 = Off (1 speed fan) Sw2 =On (HP System) Sw3=On (Two Stage) Sw4= Equipment Specific On = B Off = O Sw5= Installer preference Sw6= User requirements Sw7= Installer preference Sw8= User requirements Note: Set W3=EH Figure 8 in installer menu. 14 | P a g e ...
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Switch Settings Sw1 = Off (1 speed fan) Sw2 =On (HP System) Sw3=Off (One Stage) Sw4= Equipment Specific On = B Off = O Sw5= Installer preference Sw6= User requirements Sw7= Installer preference Sw8= User requirements Note: Set W3=OF in installer menu. Figure 9 Switch Settings Sw1 = On (3 speed fan) Sw2 =On (HP System) Sw3=Off (One Stage) Sw4= Equipment Specific On = B Off = O Sw5= Installer preference Sw6= User requirements Sw7= Installer preference Sw8= User requirements Figure 10 15 | P a g e ...
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 adjacent wires. Equipment wiring information can be found on page 12 of this manual. ...
Remove and discard the plastic tab on the internally fitted backup battery so that the battery is now in circuit and operating. 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 fine tuned 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 you wish to alter a setting or control capability so that the SMT‐770s performance will perfectly match a particular application. On the next ...
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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 ( ) or down ( ) buttons. To exit the installer menu tap the “Mode” button, the “Fan” button or wait 60 seconds. Entering the Installer Menu To enter the Installer menu, press and hold the O/RIDE button for 15 seconds. After 15 88:15” seconds the LCD will show “ – The factory default PIN. 88:21” Adjust this value to “ (or your previously selected value) by using the up ( ) or down ( ) 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 a incorrect PIN you will be exited from this menu. Default Installer Values are shown in the examples below. 18 | P a g e ...
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PN =21 Keyboard Lock PIN This is the required PIN for future entry into the Installer menu. Range 00 to 99 in 01 steps. (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. LC=02 ‐ All buttons are locked except the O/Ride button. LC=03 ‐ All buttons are locked except the Mode and O/Ride buttons. LC=04 ‐ All buttons are locked except the Mode button. 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 & O/ride buttons are locked. Mode button can only select Auto (Heat & Cool) and off. LC=04 ‐ O/Ride Button is locked Mode button can only select Auto (Heat & Cool) and off. (Note ( ) or down ( ) buttons can be limited in the HL & CL menu items) 19 | P a g e ...
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HL=35 (95F) 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) 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) C1 =0.0 Fitted Sensor Calibration Calibration Offset for the internal sensor. Adjustable range +/‐ 5 deg C (+/‐9 F). tC =12 Time Clock Display 12 or 24 hour Clock Style. tD =0 Temperature Display TD=00 ‐ The SMT‐770 will display both the Room & 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. 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) 20 | P a g e ...
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SC=OFf Stop Cooling temperature 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 Start/stop mode Only. (Sw6=on, Sw8=off). Heating temperature that will be maintained when running the “STOP” program. (Night Setback) Adjustable between 5 ~37c. (41~98F) + OFF. Db=1 Single Set Point Dead band (See page 27 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 21 | P a g e ...
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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 the mode. FO=0 ‐ (Default).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 time 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=1 ...
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Fn=A Function ‐ Available Equipment Modes FN=A ‐ Select if controlling a Heating & 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) H3=Of W2 relay Function Only operates in single fan speed HP mode. (Sw 1=off & 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. 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 terminals 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. 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 & oH temperatures will replace the user set temperatures. (See page 11 of this manual for more detail on this function.) ...
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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. oC=OFf Occupied Mode Cool Set (see page 11 for more information). Only operates if TT=OC. ...
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Sd=2 Stage 2 Span (See page 27 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 DT=35 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 Recovery) OS=0 ‐ Optimised start/stop function Off. OS=1 ‐ Optimised start/stop function running. (See page 35 for more information on this function) C2=0.0 Calibration Remote Sensor Calibration Offset for the TT terminal temperature sensor. Adjustable range +/‐ 5 deg C (+/‐9 F). Co=0(41F) Cooling OFF temperature. ‐ See page 34 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 5 ~37c. (41~98F). 25 | P a g e ...
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Ho=35 (95F) Heating OFF temperature. ‐ See page 34 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 5 ~37c. (41~98F). HB=37 (98F) High Balance Point. ‐ See page 33 for more information. 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 5 ~37c. (41~98F). LB=9.5 (15f) Low Balance point. ‐ See page 33 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 ~37c. (15~98F). Ft=off Filter warning time Return air filter cleaning warning time. Adjustable between off and 900 hours. Ad=07 Modbus Address. See page 32 for more information. Modbus communications address ...
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tS=0 Factory test mode ‐ See page 33 for more information. TS=0 ‐ Factory test Mode OFF. TS=1 ‐ Display configuration code.* TS=2 ‐ Step cycle all relays in sequence, 1 2 3 4 5 etc. (* this code table is available from the download section at www.thermostat.com.au) Control logic Single Set Point mode Two Set Point mode This simple diagram provides a general insight into the control logic of the SMT‐770 thermostat. It attempts to describe the action of the DB=XX, the SP=XX ...
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 trouble shooting guide on page 37 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 time and operating mode etc. ...
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If you choose not to use commissioning mode you may see various words and Icons flashing in the LCD when ever 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 time period overriding what would normally be expected to occur; either a function is being held on or off momentarily. Please be patient. ...
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“Heat” will change to “Heating”. Verify that the heating system is on and operating correctly. 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. ...
Using Remote Temperature Sensors Figure 12 Single Sensor Twin Averaging Sensors Three 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. Shown are 4 examples of commonly used sensor configurations. 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. Please note the configuration of RS‐01 & RS‐02 sensors in the examples provided above. Other sensor configurations are also available. Four Averaging Sensors 31 | P a g e ...
When used in Start / Stop commercial programmable mode (SW6=on SW8=off), the after hours run timer can be toggled on or off as required with a momentary press button on the remote sensor. See figure 14 Left. In line On/Off As the SMT‐770 “Auto detects” sensors connected to the In line Switch Override...
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The communications port of the SMT‐770 has 3 terminals marked “A”, “B” & “C”. Terminals “A” & “B” are used for communication, terminal “C” is used as a screen ground to protect the integrity of the communication To Network signal. Figure 15 A maximum of 35 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 ...
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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 to prevent the excessive consumption of energy when the outside air temperature is warm enough not to require additional heating stages to be used. Low Balance point SW2=on, W3 =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 only use the emergency heating system 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 & 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. ...
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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. For example, 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 set, room temperature and history of temperature change to bring on the Equipment to meet the set temperature by 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. 35 | P a g e ...
Specifications Input Voltage 24VAC 50/60 Hz +/‐ 15%. Relay rating 24VAC @ 1Amp maximum per relay. Operating Temperature 0‐50C (32 to 122F). Operating RH 0‐95% (non condensing). Storage Temperature 0‐65C (32 to 150F). Size 113 x 103 x 23mm. Display Size 74 x 55mm. Temperature Sensor(s) 10K NTC type 3. Accuracy +/‐ 0.3deg C @ 25 C. (77F) Stage Delays Minimum temperature change over time method. Timed upstage Delay 5~90 minutes. Anti‐cycle Delay Off to 4 minutes. Maximum hourly cycles Unlimited, 30, 10 or 6. (Installer set) Display resolution 0.5 deg C (1F). Control Range Off to 38c (100F). Outside Air temp display range ‐8 ~ +60c (17 ~ 140F). Back light Blue EL. Backlight life 3,000 hours to half brightness. Optimised Start/Stop method Time to start vs temp differential method ‐ updating. Communications Protocol ...
Troubleshooting Symptom Suspected Fault Suggested remedy Air from the wall cavity may be leaking into the Plug holes in wall with tape to prevent leaks Temperature display rear of the thermostat / sensor enclosure. seems inaccurate The internally fitted temperature sensor is Carefully move the room temperature folded back inside the Chameleon and not being sensor bead so that it is just behind the exposed to the room air temperature. sensor opening in the case. External heat or cool source such as lamps, Move ...
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Symptom Suspected Fault Suggested remedy The word OFF is flashing in This is not a fault TT=Of in advanced installer menu. the LCD. Mode button has no effect. Some buttons do not LC=XX value in advanced installer mode set appear to operate. Key board lock is on. the lock values, see page 17. Padlock is show on LCD. Cannot enter heat or cool SMT‐770 thermostat set for Heating or cooling Heating or cooling mode not available on modes only modes your air conditioning system Cannot set heating and ...
Specifications Input Voltage 24VAC 50/60 Htz +/‐ 15%. Relay rating 24VAC @ 1Amp maximum. Operating Temperature 0‐50C (32 to 122F). Operating RH 0‐95% (non condensing) . Storage Temperature 0‐65C (32 to 150F). Size 113 x 103 x 23mm. Display Size 74 x 55mm. Temperature Sensor(s) 10K NTC type 3. Accuracy +/‐ 0.3deg C @ 25 C. (77F) Stage Delays Minimum temperature change over time method. Timed upstage Delay 5~60 minutes. Anti‐cycle Delay Off to 4 minutes. Maximum hourly cycles Unlimited, 30, 10 or 6. (Installer set) Display resolution 0.5 deg C (1F). Control Range Off to 38c (100F). Outside Air temp display range ‐8 ~ +60c (17 ~ 140F). Back light Blue EL. Optimised Start method Time to start vs temp differential method. Communications Protocol Modbus – contact Smart Temp for objects list. Fan speeds ...
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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. 40 | P a g e ...