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3 Heat/2 Cool

Auto or Manual Changeover

Hardwired

SC 2811

Non-Programmable Electronic Thermostat

Installation, Operation & Application 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

• Configurable
• Three Stage Heat / 2 Stage Cool Systems
• Multi-Stage Heat Pump Systems
• Backlit Display
• Field Temperature Calibration
• Filter Check
• Status Indicator Light
• Relay Outputs  

(minimum voltage drop in thermostat)

• Ideally Suited for: 

– 

Residential (New Construction/Replacement)  

– 

Light Commercial

Summary of Contents for SC 2811

Page 1: ...can made products plus wiring diagrams troubleshooting tips and more visit us at www icmcontrols com Configurable Three Stage Heat 2 Stage Cool Systems Multi Stage Heat Pump Systems Backlit Display Fi...

Page 2: ...ed 2 To Remove Existing Thermostat 3 To Install Thermostat 3 Remote Sensor Installation Optional 5 Terminal Designator Descriptions 6 SC2811 Output Chart 6 Wiring Diagrams 7 Wiring Diagram Conversions...

Page 3: ...Parts Diagram R12 W1 O B Y1 W2 Y2 W3 S1 S2...

Page 4: ...rmostat is for 24 VAC applications only do not use on voltages over 30 VAC Do not short across terminals of gas valve or system control to test operation this will damage your thermostat and void your...

Page 5: ...wire terminals 5 Remove existing thermostat base from wall 6 Refer to the following section for instructions on how to install this thermostat ELECTRICAL SHOCK HAZARD Turn off power at the main servic...

Page 6: ...the control wires through wire opening 9 Use supplied screws to mount thermostat base to wall 10 Insert stripped labeled wires in matching wire terminals See Wiring Diagrams and Wiring Diagram Convers...

Page 7: ...rdware provided 4 Install two wires between remote sensor and thermostat use shielded cable Wire 1 should run between the S1 terminal on the thermostat and the S1 terminal on the remote sensor Wire 2...

Page 8: ...for non hp systems Terminal Designator Descriptions 1ST Cool 2ND Cool 1ST Heat 2ND Heat 3RD Heat Heat Cool Y1 G YI Y2 G W1 G W1 W2 G W1 W2 W3 G Heat Pump One Compressor Y1 G O Y1 G O Y1 G B Y1 W2 G B...

Page 9: ...First Cooling Control Second Cooling Control Wiring Diagrams Third Heating Control Second Cooling Control Second Heating Control First Cooling Control First Heating Control...

Page 10: ...Third Heating Control Second Heating Control First Heating Control Third Heating Control Second Heating Control First Heating Control...

Page 11: ...Single Compressor 3rd Stage Heat 2nd Stage Heat Reversing Valve Compressor Two Compressors Auxilliary Heat Reversing Valve Compressor 1 Compressor 2...

Page 12: ...24 VAC common Reversing valve cooling mode Compressor contactor 2nd stage heating circuit Fan contactor circuit Emergency heating circuit System monitor LED capped capped Note 1 E terminal on PCB cap...

Page 13: ...VAC return 24 VAC common Reversing valve heating mode Compressor contactor 2nd stage heating circuit Fan contactor circuit Emergency heating circuit System monitor LED capped capped Note 1 E terminal...

Page 14: ...at 24 VAC return 24 VAC common Reversing valve cooling mode Compressor contactor 2nd stage heating circuit Fan contactor circuit Outdoor thermostat Defrost sensor capped capped Note 1 W2 terminal on P...

Page 15: ...Systems SC 281 1 Electronic Thermostat 24 VAC return 24 VAC common Reversing valve cooling mode Compressor contactor 2nd stage heating circuit sequencer 1 Fan contactor circuit 3rd stage heating circu...

Page 16: ...VAC common Reversing valve cooling mode Compressor contactor 2nd stage heating circuit Fan contactor circuit Emergency heating circuit System monitor LED capped capped Note 1 E terminal on PCB capped...

Page 17: ...VAC return 24 VAC common Reversing valve heating mode Compressor contactor 2nd stage heating circuit Fan contactor circuit Emergency heating circuit System monitor LED capped capped Note 1 E terminal...

Page 18: ...Thermostat 24 VAC return 24 VAC common Reversing valve cooling mode Compressor contactor 2nd stage heating circuit Fan contactor circuit capped capped Note 1 X2 terminal on PCB capped Note 2 T termin...

Page 19: ...281 1 Electronic Thermostat 24 VAC return 24 VAC common Reversing valve cooling mode Compressor contactor 2nd stage heating circuit Fan contactor circuit System monitor LED capped Note 1 X terminal o...

Page 20: ...C return 24 VAC common Reversing valve cooling mode Compressor contactor 2nd stage heating circuit Fan contactor circuit Emergency heating circuit System monitor LED capped capped Note 1 E terminal on...

Page 21: ...tronic Thermostat 24 VAC return 24 VAC common Reversing valve cooling mode Compressor contactor 2nd stage heating circuit sequencer 1 Fan contactor circuit Emergency heating circuit capped Note 1 E te...

Page 22: ...common Reversing valve cooling mode Compressor contactor 2nd stage heating circuit 2nd stage cooling circuit Fan contactor circuit Note 1 E terminal on PCB capped Note 2 L terminal on PCB capped R C...

Page 23: ...C common Reversing valve cooling mode Compressor contactor 2nd stage heating circuit 2nd stage cooling circuit Fan contactor circuit Note 1 E terminal on PCB capped Note 2 L terminal on PCB capped R C...

Page 24: ...ote The SW5 button will return you to the previous screen 5 To exit configuration mode slide the Mode switch to Heat or Cool Configuration Mode Settings The setup screens for Configuration Mode are as...

Page 25: ...age Temperature Differential 1 F to 3 F 0 5 C to 1 5 C Set the number of degrees between your setpoint temperature and your turn on temperature Press the or button to set differential value Press the...

Page 26: ...utton to select Press the SW6 button to advance to the next screen FILTER DIFF ROOM SET REMOTE FILTER DIFF ROOM SET REMOTE 8 3rd Stage Temperature Differential 1 F to 6 F 0 5 C to 3 0 C Set the number...

Page 27: ...tch actual room temperature Note When not set to 0 ROOM will display Press the or button to select Press the SW6 button to advance to the next screen FILTER DIFF ROOM SET REMOTE 15 Filter Check time 3...

Page 28: ...arily bypass the five minute delay slide the Mode switch to OFF for 2 seconds and then back to Cool Heat Test 1 Slide Mode switch to Heat mode 2 Adjust the set temperature so it is 5 degrees above the...

Page 29: ...puts are staged off configurable setting 10 Page 24 as the room temperature drops The thermostat will not let the compressor come on for five minutes after it turns off This protects your compressor T...

Page 30: ...ff This protects the compressor Emergency Heat Mode Heat pump systems only In emergency heat mode the heat pump system will be disabled and auxiliary heat will become the primary source of heat ENTER...

Page 31: ...ROOM displays Room temperature offset is not zero see Configuration Mode Setting 13 Page 25 Status indicator Green light Cooling operation Red light Heating operating Status indicator option ON see C...

Page 32: ...r 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 Se...

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