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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 ...
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Table of Contents Installation ........................ 4 Mounting the wall controller .................... 5 Setting the hardware switches ................... 6 TT Terminal Functions .................... 9 Outside Air Sensor wiring .................... 1 0 Remote Air Temperature sensor wiring. ................ 1 0 Averaging Temperature sensors .................. 1 1 Remote ON / OFF function .................... 1 1 Using the “Occupancy Mode .................... 1 1 Supply Air Temperature Monitoring ................. 1 2 ...
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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 ‐ 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 – Commissioning. For convenience the layout of this manual is in the same order as the steps listed above. 4 | P a g e ...
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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 ...
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Setting the hardware switches Switch 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 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 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 the “Y” terminal(s) only for cooling. Heat Pump systems use the “Y” terminal(s) for BOTH heating and cooling (the compressor). ...
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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 ...
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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 ...
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Outside Air Sensor Wiring Set “TT= OA” in the advanced installer menu. 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 ...
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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 ...
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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 ...
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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 Tip Set Installer menu Fn=H Figure 4 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 Figure 5 13 | P a g e ...
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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 6 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 7 ...
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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 suit the system Figure 8 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 suit the system ...
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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 suit the system Figure 10 Switch Settings Sw1 = Off (1 speed fan) Sw2 =On (HP System) Sw3=On (Two Stage) Sw4= On Heat (B)/ Off Cool (O) Sw5= Installer preference Sw6= User requirements Sw7= Installer preference Sw8= User requirements Note: Set W3=EH in the installer menu. ...
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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 Tip Set Installer menu Fn=H Figure 12 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 13 17 | P a g e ...
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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. ...
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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 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 | P a g e ...
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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 “ (eight eight one five). 88:21” Adjust this value to “ – (eight eight two one) the factory default PIN (or your previously selected value) by using the up () or down () button. Tap the O/RIDE button to enter the menu. ...
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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. To prevent accidental PIN changes, you must press and hold the or 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 & 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 & 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 the temp +/‐ buttons range can be limited in the HL & CL menu ) 21 | P a g e ...
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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) 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 +/‐ 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 & 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. ...
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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 temperature (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 | 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 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 ...
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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) 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 & 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 & E. Heating mode (both use W2 relay) 25 | P a g e ...
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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(s). tt = OF ‐ A closed contact on the TT terminals will switch the SMT‐770 On or OFF. ...
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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. Adjustable range 0‐35c (32 – 95f) 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 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 S3 = 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 cooling 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 Recovery) 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 | P a g e ...
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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 | P a g e ...
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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 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 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.
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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 are 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 ...
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Control logic This simple diagram (right) 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 and SD=XX advanced 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 extremely tight temperature control can be achieved, or a more energy efficient temperature control profile can be set. ...
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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, these ...
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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. ...
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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. ...
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Using Remote Temperature Sensors Figure 15 Twin Averaging Sensors Three Averaging Sensors Single Sensor 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) Four Averaging Sensors ...
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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 (SW6=on SW8=off), the afterhours run timer can be toggled on or off as required with a momentary press button on the 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 Figure 16 Figure 17 to open circuit the sensor loop. See 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 ...
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The communications port of the SMT‐770 has 3 terminals used for communication. “A”, “B” & “T”. Terminals “A+” & “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 of the communication signal). 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 ...
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It is essential that the network be wired as a daisy chain as shown in fig 20. Figure 20 Fig 21 & 22 show examples of how NOT to wire a ModBus network. Short communication runs, 1mm (18 gauge) twisted pair unshielded wire can be used, however for longer runs or where electrical noise may be present twisted pair with shield should be used. Figure 21 ...
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High 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 ...
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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 the 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 ...
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. Adaptive recovery 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 19. 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 ...
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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. 46 | P a g e ...