Related Manuals for Mars 70801
Summary of Contents for Mars 70801
- Page 1 70801-IM 12/14/06 3:06 PM Page 1 ® 70801 Model INSTALLATION AND OPERATING INSTRUCTIONS Non-Programmable Electronic Thermostat Heat/Cool...
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Page 2: Specifications
70801-IM 12/14/06 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 70801-IM 12/14/06 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 70801-IM 12/14/06 3:06 PM Page 4 GAS / ELECTRIC: Configures the thermostat to either gas/oil or electric heating systems. • • C / F: Sets the display in either Celsius or Fahrenheit. NORM / HP: Configures the thermostat for normal heating/cooling systems or heat pump systems (single •...
- Page 5 70801-IM 12/14/06 3:06 PM Page 5 5) Set the system switch to the OFF position. The system should Image shows room temperature shut down within several seconds. The LCD will again display of 70 and HEAT set point of 73.
- Page 6 70801-IM 12/14/06 3:06 PM Page 6 Operating The New Thermostat 1) Set the System switch to either the HEAT or COOL position and the Fan switch to either the AUTO or ON position. 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.
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Page 7: Troubleshooting
70801-IM 12/14/06 3:06 PM Page 7 Troubleshooting SYMPTOM CORRECTIVE ACTION Display is blank Check thermostat wiring & connections. Check circuit breaker/fuse panel. No heat Set system switch to HEAT and raise set point above room temperature. Check thermostat wiring and connections. -
Page 8: Wiring Diagrams
70801-IM 12/14/06 3:06 PM Page 8 Wiring Diagrams Typical 4-Wire System Install Jumper HEAT CONTROL CONTROL COOL CONTROL 24 VAC TRANSFORMER... - Page 9 70801-IM 12/14/06 3:06 PM Page 9 Wiring Diagrams Typical 5-Wire System COOL HEAT CONTROL CONTROL CONTROL COOL 24 VAC HEAT 24 VAC TRANSFORMER TRANSFORMER...
- Page 10 70801-IM 12/14/06 3:06 PM Page 10 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...
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Page 11: One-Year Limited Warranty
Warranty ONE 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 one year after the original date of purchase by a professional service technician and does not include the cost of removal or re-installation. - Page 12 70801-IM 12/14/06 3:06 PM Page 12 INSTALLATION AND OPERATING INSTRUCTIONS Non-Programmable Electronic Thermostat Heat/Cool 70801 Model ®...
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