Mars 70810 Installation And Operating Instructions Manual
INSTALLATION AND OPERATING INSTRUCTIONS
5-2 Programmable Electronic
Thermostat Heat/Cool
®
Model 70810
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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.
WARNING!
• To prevent electrical shock and/or equipment damage, disconnect electric power to system at main fuse or circuit breaker box until installation is complete.
• Do not use this thermostat on applications with voltages above 30VAC. Wiring must conform to all local and
national building/electrical codes and ordinances.
• Do not short (jumper) across terminals on the gas valve or at the system control to test the installation. This
will damage the thermostat and void the warranty.
• This thermostat is equipped with automatic compressor protection to prevent damage due to short cycling.
The short cycle protection provides a 5-minute delay between heating (heat pump models) or cooling cycles to
prevent the compressor from being damaged.
• Do not switch the system to cool if the outdoor temperature is below 50 F (10 C). This may damage the cooling system and may cause personal injury. This thermostat should be used only as described in this manual.
SPECIFICATIONS
Electrical Rating: 24 Volt AC (18-30 VAC)
1 Amp Maximum per Terminal
2 Amps Total Load
Control: 1 Heat / 1Cool Single Stage Heat Pump
Set Point Range: 45 F – 90 F (7.0 C – 32.0 C)
Program: 5 - 2 (Mon-Tue-Wed-Thur-Fri) & (Sat-Sun)
Set Points: Morn, Day, Eve, Night
Advanced Recovery: Yes
Accuracy: +/- 1 F (.5 C)
Terminations: RC, RH, C, G, Y, W, B, O
Power: 24VAC
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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.
IMPORTANT: Before removing these wires, NOTE (ON A PIECE OF PAPER) THE COLOR OF EACH WIRE
AND THE CORRESPONDING TERMINAL MARKING ON THE OLD THERMOSTAT.
3) Remove the wires from the terminals. Remove the old thermostat and mounting base from the wall.
Installing The New Thermostat
1) CAUTION: Make certain the power to the system has been disconnected.
2) If this is a new installation, locate the thermostat 4 to 5 feet above the floor in accordance with applicable
codes. Select a location that provides good airflow. Avoid locations in direct sunlight, near sources of heat,
or near air vents. NOTE: The display is designed to be best viewed from a front downward angle.
3) Remove the back plate of the thermostat by gently depressing the bottom locking tab and swinging the back
plate up and away.
4) Place the back plate against the wall in the desired mounting location with the thermostat wires protruding
from the wall through the large rectangular whole in the back plate.
5) Mark placement of the (2) mounting holes (oval shaped holes in back plate) on the wall, remove the back
plate, and drill (2) 3/16” holes.
6) Tap supplied plastic anchors into the holes.
7) Secure the back plate to the wall with the supplied screws making certain the thermostat wires have been
inserted through the large rectangular hole in the back plate.
8) Carefully attach the thermostat wires to the appropriate connections on the terminal board on the back plate.
Use the notes taken from step 2 of Removing The Existing Thermostat to determine their location on the new
thermostat. Reference wiring diagrams are available in the back of this manual.
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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,
se the switch to HE. For gas, set the switch to HG.
•
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 stage).
10) Attach the thermostat body to the back plate by resting the top of the thermostat body on the two clips on
the upper portion of the back plate. Then gently press the front body into place until the bottom locking
tab snaps into place. NOTE: The terminal board pins must be properly aligned with the sockets on the
terminal board (on the back plate) in order for the front body to properly snap into place.
11) Set the system switch to the OFF position.
12) Set the fan switch to the AUTO position.
Testing The New Thermostat
WARNING!
• Do not switch the system to cool if the outdoor temperature is below 50 F (10 C). This may damage the
cooling system and may cause personal injury.
• This thermostat is equipped with automatic compressor protection to prevent damage due to short
cycling. The short cycle protection provides a 5-minute delay between heating (heat pump models) or
cooling cycles to prevent the compressor from being damaged.
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
return to its normal state after 10 seconds.
Image shows display altering between time and a
room temperature of 70
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2) Set the fan switch to the ON position. The system blower should start.
3) Set the fan switch to the AUTO position. The system blower should stop.
4) Set the system switch to the HEAT position and depress the red
arrow key until the temperature set point is at least 3 degrees
above the room temperature. The LCD will display a flame icon
to indicate heat. The heating system should start within several
seconds (the system blower may not come on immediately).
5) Set the system switch to the OFF position. The system should shut down within several seconds. The LCD
will again alternately display the time and room temperature.
6) Set the system switch to the COOL position and depress the
blue arrow key until the temperature set point is at least 3
degrees below the room temperature. The LCD will display a
snowflake icon to indicate A/C. The cooling system should start
within several seconds.
WARNING: Do not perform this test if the outdoor temperature is below 50 F.
7) Set the system switch to the OFF position. The system should shut down within several seconds. The LCD
will again alternately display the time and room temperature.
Programming The User Settings
Temperature Differential is factory set at .5 F (0.25 C) for both heating and cooling cycles. The room tempera-
ture must change .5 F (0.25 C) from the set point temperature before the thermostat will initiate a call for heat or
A/C. This should be appropriate for most applications. However, if the system is cycling on and off too frequently, the setting can be adjusted as follows.
1) With the system setting in the OFF position, simultaneously depress the PROGRAM and RUN keys two
times. The LCD will display the temperature differential setting.
Using the red and blue arrow keys set the differential to the desired
setting of .5, 1, or 2 degrees. The higher the setting, the less frequently the system will cycle.
Image shows room temperature of 71 and Heat set
point of 75 as the display alternates every 3 seconds.
Image shows room temperature of 76 and A/C set
point of 73 as the display alternates every 3 seconds.
Image shows temperature differential setting of
0.5 degrees.
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