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Mars 70814 Installation And Operating Instructions Manual

7 day programmable electronic thermostat 2 heat/2 cool non heat pump
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70814-IM
12/22/06
2:00 PM
Page 1
®
70814
Model
INSTALLATION AND OPERATING INSTRUCTIONS
7 Day Programmable Electronic Thermostat
2 Heat/2 Cool Non Heat Pump

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Summary of Contents for Mars 70814

  • Page 1 70814-IM 12/22/06 2:00 PM Page 1 ® 70814 Model INSTALLATION AND OPERATING INSTRUCTIONS 7 Day Programmable Electronic Thermostat 2 Heat/2 Cool Non Heat Pump...

  • Page 2: Specifications

    70814-IM 12/22/06 2:00 PM Page 2 WARNING! • To prevent electrical shock and/or equipment damage, disconnect electric power to system at main fuse or cir- cuit breaker box until installation is complete. • This thermostat requires 24 VAC and/or 2 AA Alkaline batteries for power.
  • Page 3 70814-IM 12/22/06 2:00 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 70814-IM 12/22/06 2:00 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 70814-IM 12/22/06 2:00 PM Page 5 1) Restore the system power. The LCD (liquid crystal display) will alternately display the time and room temperature. The LCD will Image shows display alternating between time illuminate at the touch of the red or blue arrow keys. LCD will and a room temperature of 70 return to its normal state after 10 seconds.
  • Page 6 70814-IM 12/22/06 2:00 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 70814-IM 12/22/06 2:00 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 70814-IM 12/22/06 2:00 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 system blower will operate continuously.
  • Page 9 70814-IM 12/22/06 2:00 PM Page 9 Vacation Hold Image shows 1 day 1) The thermostat can be set to hold a single specific temperature for up to hold at 73 F 30 consecutive days. Upon activation, the thermostat will hold the temperature until the duration period times out at which point the thermostat will return to program mode.
  • Page 10 70814-IM 12/22/06 2:00 PM Page 10 • High Temperature Protection: While in the HEAT position, if the room temperature reaches 93 F (34 C), the thermostat will automatically shut off. In the unlikely event the room temperature reaches 99 F (37 c), a mechanical bimetal switch will shut off the thermostat.

  • Page 11: Troubleshooting

    70814-IM 12/22/06 2:00 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 Check thermostat wiring and connections.

  • Page 12: Wiring Diagrams

    70814-IM 12/22/06 2:00 PM Page 12 Wiring Diagrams Typical Multi-Stage System 1st STAGE CONTROL HEAT 1st STAGE 2nd STAGE COMPRESSOR HEAT 2nd STAGE COMPRESSOR 24 VAC TRANSFORMER...
  • Page 13 70814-IM 12/22/06 2:00 PM Page 13...
  • Page 14 70814-IM 12/22/06 2:00 PM Page 14...

  • 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 70814-IM 12/22/06 2:00 PM Page 16 INSTALLATION AND OPERATING INSTRUCTIONS 7 Day Programmable Electronic Thermostat 2 Heat/2 Cool Non Heat Pump 70814 Model ®...