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The default temperature differential is 1°. When your room temperature varies by 1°F, the thermostat 
turns on your system. If you notice your system turning on and off too frequently, increase the 
temperature differential. 
1.  Reset the thermostat by removing batteries for 10 seconds and then reinstall them.
2.  For the first 10 seconds of operation, the temperature differential is displayed. 
3.  Press the   or   button to select desired setting.

Setting the Temperature Differential

The temperature displays in degrees Fahrenheit as a factory set default. Follow these steps to change to 
degrees Celsius:
1.  Remove the cover and batteries.
2.  Move the jumper select marked 

F

 and 

C

 (see Parts Diagram on Page 1).

3.  Reinstall the batteries and cover. Your LCD readout changes accordingly.

Changing Fahrenheit to Celsius

1. 

Move the 

Fan Auto/On

 switch into the 

Auto

 position.

2. 

Move the 

Off/Heat

 switch into the 

Heat

 position.

Starting the Thermostat

1.  Place 

Off/Heat

 switch in the 

Heat

 position.

2.  Press the   or   button a single time to see the 

current temperature

 setting.

3.  Press the   or   button until the 

desired temperature

 setpoint displays.

4.  The new temperature setpoint is automatically saved in memory. After 5 seconds, the display returns 

to showing the current room temperature.

Setting the Setpoint Temperature

Summary of Contents for SC 1800

Page 1: ... Guide For more information on our complete range of American made products plus wiring diagrams troubleshooting tips and more visit us at www icmcontrols com Controls Single Stage Heating Systems Millivolt and Hydronic water or steam System Compatible Compatible with Gas and Electric Systems Mercury Free Environmentally Safe ...

Page 2: ...move Existing Thermostat 3 Replacing Wiring Labels 4 To Install Thermostat 4 Installing and Changing Batteries 5 Wiring Diagrams 6 Heating Only 6 Zone Valve Damper Motor System 7 Setting the Setpoint Temperature 8 Setting the Temperature Differential 8 Changing Fahrenheit to Celsius 8 Starting the Thermostat 8 A Quick Test 9 Troubleshooting 9 ...

Page 3: ...perature Setpoint Room Temperature Low Battery Signal Temperature Differential Setting SET ROOM LO BAT DIFF Celsius Fahrenheit Jumper Heat Switch Battery Compartment Fan Switch Electric Gas Switch Parts Diagram ...

Page 4: ... 7 C to 32 C Accuracy 1 F 0 5 C Differential Rage 1 F to 3 F 0 5 C to 1 5 C System configurations 1 stage heat gas oil electric Terminations R W G Important Safety Information WARNING Always turn off power at the main power supply before installing cleaning or removing thermostat This thermostat is for 24 VAC applications only do not use on voltages over 30 VAC Do not short across terminals of gas...

Page 5: ...ius display three available temperature differential settings ELECTRICAL SHOCK HAZARD Turn off power at the main service panel by removing the fuse or switching the appropriate circuit breaker to the OFF position before removing the existing thermostat 1 Turn off power to the heating system by removing the fuse or switching off the appropriate circuit breaker 2 Remove cover of old thermostat This ...

Page 6: ... door or in an area affected by a vent or duct 1 Turn off power to the heating and cooling system by removing the fuse or switching off the appropriate circuit breaker 2 Move the Fan Auto On switch into Auto position 3 To remove cover insert and twist a coin or screwdriver in the slots on the sides of the thermostat 4 Put thermostat base against the wall where you plan to mount it Be sure wires wi...

Page 7: ...iented in the direction shown on the battery compartment 16 Replace cover on thermostat by snapping it in place 17 Turn on power to the system at the main service panel If your LCD is blank or displaying LO BAT the batteries are not installed or need to be changed We suggest you change the batteries at least once a year or whenever the LO BAT warning displays Note After installing new batteries yo...

Page 8: ... Heating Only 3 Wire Single Transformer 2 Wire Single Transformer or Millivolt Wiring Diagrams ...

Page 9: ... Zone Valve Damper Motor System 3 Wire Zone Valve Damper Motor System 2 Wire Zone Valve Damper Motor System Note Differential temperature may need to be increased for zone damper systems see Page 8 ...

Page 10: ...Follow these steps to change to degrees Celsius 1 Remove the cover and batteries 2 Move the jumper select marked F and C see Parts Diagram on Page 1 3 Reinstall the batteries and cover Your LCD readout changes accordingly Changing Fahrenheit to Celsius 1 Move the Fan Auto On switch into the Auto position 2 Move the Off Heat switch into the Heat position Starting the Thermostat 1 Place Off Heat swi...

Page 11: ...nsuccessful double check that the wires are securely connected and are connected to the proper terminals Consult the troubleshooting section below Symptom Remedy The system is not turning on Check batteries display is blank when batteries are not present or are dead LCD is blank or displaying LO BAT Replace batteries or make sure the existing ones are properly installed Thermostat is not properly ...

Page 12: ...er to permit the Seller to properly administer the warranty the Buyer shall 1 Notify the Seller promptly of any claim submitting date code information or any other pertinent data as requested by the Seller 2 Permit the Seller to inspect and test the product claimed to be defective Items claimed to be defective and are determined by Seller to be non defective are subject to a 30 00 per hour inspect...

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