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Mars 70813 Installation And Operating Instructions Manual

7 day programmable electronic thermostat heat/cool
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70813-IM
12/22/06
3:49 PM
Page 1
®
70813
Model
INSTALLATION AND OPERATING INSTRUCTIONS
7 Day Programmable Electronic
Thermostat Heat/Cool

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Summary of Contents for Mars 70813

  • Page 1 70813-IM 12/22/06 3:49 PM Page 1 ® 70813 Model INSTALLATION AND OPERATING INSTRUCTIONS 7 Day Programmable Electronic Thermostat Heat/Cool...

  • Page 2: Specifications

    70813-IM 12/22/06 3:49 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 70813-IM 12/22/06 3:49 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 70813-IM 12/22/06 3:49 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 70813-IM 12/22/06 3:49 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 alternating between time return to its normal state after 10 seconds.
  • Page 6 70813-IM 12/22/06 3:49 PM Page 6 1) With the system setting in the OFF position, simultaneously depress Image shows temperature the PROGRAM and RUN keys two times. The LCD will display the differential setting of 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 70813-IM 12/22/06 3:49 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 Sunday. This program can be customized using the steps below.
  • Page 8 70813-IM 12/22/06 3:49 PM Page 8 Customizing the Program 1) Set the System switch to the HEAT or COOL position and the Fan switch to either the AUTO or ON posi- tion. NOTE: In AUTO, the system blower will run only when the A/C or heat is running. In ON, the sys- tem blower will operate continuously.
  • Page 9 70813-IM 12/22/06 3:49 PM Page 9 Vacation Hold Image shows 1 day 1) The thermostat can be set to hold a single specific temperature for up to 30 hold at 73 F consecutive days. Upon activation, the thermostat will hold the tempera-...
  • Page 10 70813-IM 12/22/06 3:49 PM Page 10 • Compressor Protection: To protect the system compressor(s) from damage, the thermostat features a 5 minute delay. After the cooling system (or heat pump) turns off, the thermostat will not allow it to re-start until the 5 minute delay expires.

  • Page 11: Troubleshooting

    70813-IM 12/22/06 3:49 PM Page 11 Troubleshooting SYMPTOM CORRECTIVE ACTION Display is blank Install 2 fresh AA Alkaline batteries. Check wiring connections on thermostat. Set system switch to HEAT and raise set point above room temperature. No heat If flame icon is blinking, allow the 5 minute compressor lock-out to expire.

  • Page 12: Wiring Diagrams

    70813-IM 12/22/06 3:49 PM Page 12 Wiring Diagrams Typical 4-Wire System Install Jumper HEAT CONTROL CONTROL COOL CONTROL 24 VAC TRANSFORMER...
  • Page 13 70813-IM 12/22/06 3:49 PM Page 13 Wiring Diagrams Typical 5-Wire System HEAT COOL CONTROL CONTROL CONTROL COOL 24 VAC HEAT 24 VAC TRANSFORMER TRANSFORMER...
  • Page 14 70813-IM 12/22/06 3:49 PM Page 14 Wiring Diagrams Typical 2-Wire Millivolt System HEAT CONTROL 24 VAC TRANSFORMER Typical Single Stage Heat Pump System Install Jumper Install Jumper REV. VALVE CONTROL COOL ENERGIZED REV. VALVE COMPRESSOR HEAT ENERGIZED CONTROL 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 70813-IM 12/22/06 3:49 PM Page 16 INSTALLATION AND OPERATING INSTRUCTIONS 7 Day Programmable Electronic Thermostat Heat/Cool 70813 Model ®...