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Lightstat TME series, Installation & Operation Manual, Page: 1 / 28

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INSTALLATION & OPERATION  

MANUAL

Model 

TME-____________________*

 

* Balance of model number is determined by  

customer specified limits and Setbacks.

AUTOMATIC SETBACK THERMOSTAT 

LIGHT SENSING OR CONTACT CLOSURE 

 

FOR LOW VOLTAGE (24VAC) SYSTEMS ONLY  

REQUIRES A COMMON WIRE

Manufactured by: 

LIGHTSTAT INC. 

 

BARKHAMSTED, CT 

 

(800)292-2444 

www.lightstat.com

Summary of Contents for TME series

Page 1: ...of model number is determined by customer specified limits and Setbacks AUTOMATIC SETBACK THERMOSTAT LIGHT SENSING OR CONTACT CLOSURE FOR LOW VOLTAGE 24VAC SYSTEMS ONLY REQUIRES A COMMON WIRE Manufac...

Page 2: ...heat or a limit switch controlled fan typical of gas heat Auxiliary output options to permit the O B output to be active with a call for Heat or Cool for heat pump reversing valve A1 A2 isolated dry...

Page 3: ...nterface with these types of systems The Lightstat TME is designed for 24 VAC systems only Pick a mounting location AWAY from drafts windows doors outside walls and heat vents Relocate if necessary Th...

Page 4: ...Fan ON AUTO button I Fan ON AUTO Indicator J Light Sensitivity Adjustment K Illuminated ON and arrow indicate which outputs are currently ON Flashing arrow indicates time delay L Flashing DELAY indica...

Page 5: ...t TME must be installed on a single transformer system C Common or Neutral side of transformer This must be connected O B This output may be active with either a call for Heat B or a call for Cool O b...

Page 6: ...a Lightstat TME You can add a Remote Room Sensor to sense temperature remotely Two Averaging Remote Room Sensors may be used to provide an average Room Temperature Order as Averaging Sensors And you...

Page 7: ...sors are unaffected by wire runs of up to 500 feet Remote Room Sensor cables do not have polarity either wire may be connected to either terminal Cables do not need to be shielded At the Lightstat TME...

Page 8: ...ble between the Lightstat TME and the Supply Air Sensor Supply Air Sensor is unaffected by wire runs of up to 500 feet Supply Air Sensor cables do not have polarity either wire may be connected to eit...

Page 9: ...t have to be shielded At the Lightstat TME end connect the cable to the two terminals marked A1 and A2 At the other end connect it to the damper or equipment The A1 and A2 terminals are an isolated se...

Page 10: ...C1 C2 cable does not have polarity either wire may be connected to either terminal Cables do not have to be shielded At the Lightstat TME end connect the cable to the two terminals marked C1 and C2 At...

Page 11: ...t RTU This is a field option You might not have this option with your specific RTU Use 18 gauge 2 conductor cable between the Lightstat TME and the RTU The alarm is unaffected by wire runs of up to 10...

Page 12: ...void expensive electric resistance heat Note When connecting a Lightstat TME to a heat pump with Thermostat Reversing Valve Control you will need to install a jumper wire between W1 and Y1 at the Ligh...

Page 13: ...n and Off time for any stage of Heating or Cooling will be 3 minutes When set to ON there will be no minimum On and Off time for any stage of Heating or Cooling In either position the Fan will continu...

Page 14: ...e position of the O B switch will determine whether the O B output comes on with a call for Heating or for Cooling In the OFF position it will remain latched On during the Cooling Cycles O until there...

Page 15: ...as Electric switch Consult the HVAC equipment manufacturer instructions for details on how to set this switch When controlling fossil fueled equipment with a fan limit control you may want to set this...

Page 16: ...l tell the Lightstat TME to ignore the on board temperature sensor You will see the word REMOTE appear in the display indicating the Remote Room Sensor switch has been moved to ON A 00 in the display...

Page 17: ...re occupancy and how far away from the heating and cooling setpoints the temperature is It calculates how long it will take to heat up or cool down and operates the equipment accordingly Remember to c...

Page 18: ...ion on your Lightstat TME Sequence Display Symbol Meaning First All Characters On Verifies all display characters Second Cool Set Factory Min Cool Setting Heat Set Factory Max Heat Setting Temperature...

Page 19: ...the top of your Lightstat TME is where it senses the light If you shadow the window at the top of the Lightstat TME it will cause it to shift to the Setback mode It will signal this by turning on the...

Page 20: ...button to shift the temperature display from ROOM temperature to SUPPLY temperature The SUPPLY temperature is the air temperature coming from your HVAC system You will have to install a Supply Air Se...

Page 21: ...hift to AUTO FAN during Setback The CHECK button is used to cancel any safety time delays These time delays are to protect the equipment from short cycling and to prevent multiple HVAC systems from co...

Page 22: ...ating setpoint up to a maximum HEAT LIMIT When you reach the HEAT LIMIT the heating setpoint will stop and the display will flash HEAT SET AT MAXIMUM The cooling setpoint can continue to be adjusted h...

Page 23: ...e output is being held off for a minimum time period Whenever a delay is in effect the word DELAY will also flash above the indicators Note Use the CHECK button to cancel time delays for quicker check...

Page 24: ...ng on during the summer when the room temperature is well above the Heating Maximum You do this by pushing and holding the Up Button and the CHECK button at the same time Outputs will only remain on w...

Page 25: ...money and RTU down time If the RTU has an alarm signal connection when something is not working prop erly it will send an alarm signal to the thermostat When this occurs a red flashing light will be...

Page 26: ...4 VAC is present at terminal block by measuring from R to C If no voltage present check breakers and fuses Fan Blows Cold air in Heating Season Fan ON AUTO is in the wrong position Move Fan toAuto pos...

Page 27: ...s blank Transformer is too small for the installation The Lightstat TME needs a minimum of 21VAC to operate You may have to install a larger transformer to provide adequate power to keep the voltage a...

Page 28: ...t that it deter mines to be defective Replaced Products may be refurbished or new equipment at the option of Light stat Such Product must be removed by the installer and returned to the factory within...

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