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Mars 70812 Installation And Operating Instructions Manual

5-1-1 programmable electronic thermostat heat/cool
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70812-IM
12/21/06
3:06 PM
Page 1
®
70812
Model
INSTALLATION AND OPERATING INSTRUCTIONS
5-1-1 Programmable Electronic
Thermostat Heat/Cool

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Summary of Contents for Mars 70812

  • Page 1 70812-IM 12/21/06 3:06 PM Page 1 ® 70812 Model INSTALLATION AND OPERATING INSTRUCTIONS 5-1-1 Programmable Electronic Thermostat Heat/Cool...

  • Page 2: Specifications

    70812-IM 12/21/06 3:06 PM Page 2 Compatible with low voltage single stage gas, oil or electric heating or cooling systems and single stage heat pumps. For use on 24VAC systems (not to exceed 30VAC) and 250mv to 750mv millivolt heating only systems.
  • Page 3 70812-IM 12/21/06 3:06 PM Page 3 Removing The Existing Thermostat 1) CAUTION: Make certain the power to the system has been disconnected. 2) Remove the cover of the old thermostat and locate the wires that are connected to the terminal board.
  • Page 4 70812-IM 12/21/06 3:06 PM Page 4 9) Carefully place the thermostat body face down on a soft surface to expose the main circuit board. Gently set the following switches in the correct position for the application. • GAS / ELECTRIC: Configures the thermostat to either gas/oil or electric heating systems. For electric, set the switch to HE.
  • Page 5 70812-IM 12/21/06 3:06 PM Page 5 1) Restore the system power. The LCD (liquid crystal display) will alternately display the time and room temperature. The LCD will illuminate at the touch of the red or blue arrow keys. LCD will Image shows display altering between time and a return to its normal state after 10 seconds.
  • Page 6 70812-IM 12/21/06 3:06 PM Page 6 Image shows tempera- 1) With the system setting in the OFF position, simultaneously depress ture differential setting of the PROGRAM and RUN keys two times. The LCD will display the 0.5 degrees. temperature differential setting. Using the red and blue arrow keys set the differential to the desired setting of .5, 1, or 2 degrees.
  • Page 7 70812-IM 12/21/06 3:06 PM Page 7 Setting the Heating & Cooling Programs The thermostat includes a factory set program that will adjust the temperature 4 times per day (MORN, DAY, EVE, NIGHT) Monday through Friday and Saturday and Sunday. This program can be customized using the steps below.
  • Page 8 70812-IM 12/21/06 3:06 PM Page 8 5) Set the remaining Day, Evening, and Night times and temperatures for the Mon – Fri. and Sat & Sun periods: • Depress the PROGRAM key to select the desired period. (Each depression of this key cycles the menu to the next period.)
  • Page 9 70812-IM 12/21/06 3:06 PM Page 9 NOTES: To view the time remaining on vacation hold during normal operation, depress the VACATION key at any time. To leave vacation mode and return the thermostat back to normal program mode at any time, depress the RUN key for 1 second.
  • Page 10 70812-IM 12/21/06 3:06 PM Page 10 • Filter Change Reminder: The thermostat features a reminder for the user to change the heating/cooling system filter(s). When the system fan is operating, the internal thermostat timer is activated. When the timer reaches 500 hours, the filter icon will appear in the LCD. To view the time: 1) Depress the PROGRAM and RUN Image shows the filter counter at 208 hours.

  • Page 11: Troubleshooting

    70812-IM 12/21/06 3:06 PM Page 11 Troubleshooting SYMPTOM CORRECTIVE ACTION Display is blank Install 2 fresh AA Alkaline batteries. No heat Set system switch to HEAT and raise set point above room temperature. If flame icon is blinking, allow the 5 minute compressor lock-out to expire.

  • Page 12: Wiring Diagrams

    70812-IM 12/21/06 3:06 PM Page 12 Wiring Diagrams Typical 5-Wire System COOL HEAT CONTROL CONTROL CONTROL COOL 24 VAC HEAT 24 VAC TRANSFORMER TRANSFORMER Inst...
  • Page 13 70812-IM 12/21/06 3:06 PM Page 13 Wiring Diagrams Typical Single Stage Heat Pump System Install Jumper Install Jumper REV. VALVE CONTROL COOL ENERGIZED COMPRESSOR REV. VALVE CONTROL HEAT ENERGIZED 24 VAC TRANSFORMER...
  • Page 14 70812-IM 12/21/06 3:06 PM Page 14 Wiring Diagrams Typical 2-Wire Millivolt System HEAT CONTROL 24 VAC TRANSFORMER Typical 4-Wire System COOL 24 VAC TRANSFORMER Install Jumper Install Jumper COOL HEAT CONTROL CONTROL CONTROL 24 VAC TRANSFORMER CONTROL COOL CONTROL COOL 24 VAC...

  • Page 15: Two Year Limited Warranty

    Warranty TWO YEAR LIMITED WARRANTY Motors & Armatures Inc. warrants each new MARS thermostat against any defects due to non-conforming material or workmanship for a period of two years after the original date of purchase by a professional service technician and does not include the cost of removal or re-installation.
  • Page 16 70812-IM 12/21/06 3:06 PM Page 16 INSTALLATION AND OPERATING INSTRUCTIONS 5-1-1 Programmable Electronic Thermostat Heat/Cool 70812 Model ®...