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Terminals S1 and S2 can be used for an indoor remote sensor. 
The indoor remote sensor is used to read the indoor temperature 
in a different location. This is beneficial when the thermostat is not 
mounted in the ideal location.
1.  Remove cover from remote sensor housing.
2.  Select an appropriate location for mounting the remote sensor.
3.  Mount remote sensor unit using hardware provided.
4.  Install two strand shielded wire between remote sensor and 

thermostat. Shielded wire is recommended.  

Do not

 run remote sensor wire in conduit with other wires.

  • 

Wire 1

 should run between the S1 terminal on the thermostat 

and the S1 terminal on the remote sensor

  • 

Wire 2

 should run between the S2 terminal on the thermostat 

and the S2 terminal on the remote sensor

  •  Connect the shielding of the wire to the S2 terminal on the thermostat
5.  Configure the thermostat to operate with the remote indoor sensor (see Configuration Mode setting 13).

Remote Sensor Installation (Optional)

 

Note:

  Remote or outdoor sensor reading can be 

displayed by simultaneously pressing the 

Down

 and 

SYS

 buttons.

Remote Sensor:

 

(Shown: Optional ICM ACC-RT103 Remote Indoor 
Sensor; for outdoor sensor, order ACC-OD103.)

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

2 Heat/2 Cool

Auto Changeover

Hardwire

SC5811

Programmable Electronic Thermostat

•  7-Day, 5-2-Day or 5-1-1-Day Programmable
•  Configurable
•  2-Stage Heat/2-Stage Cool Systems
•  2-Stage Heat Pump Systems
•  Large Display With Backlight
•  Selectable Fahrenheit or Celsius
•  Compatible with Gas, Oil, or Electric
•  SimpleSet™ Field Programming
•  Status Indicator Light
•  Relay Outputs  

(minimum voltage drop in thermostat)

•  Remote Sensor Compatible
•  Ideally Suited for: 

– 

Residential (New Construction/Replacement) 

– 

Light Commercial

Specifications

Electrical rating:

  •  24 VAC (18-30 VAC) 

 

•  1 amp maximum per terminal 

 

•  3 amp maximum total load

Temperature control range: 

45°F to 90°F (7°C to 32°C)   

Accuracy:

 ± 1°F (± 0.5°C)

System configurations:

 2-stage heat, 2-stage cool, heat pump, gas, oil, electric

Timing:

  Anti-short Cycle: 4 minutes (bypass anti-short cycle delay by returning to OFF mode for 5 seconds)

 

Backlight Operation: 10 seconds

Terminations:

 S1, S2, R, C, W/O/B, Y1, W2, Y2, G 

Package Contents/Tools Required

Package includes:

 

SC5811

 thermostat on base, thermostat cover, wiring labels, screws and wall anchors, 

Installation, Operation and Application Guide

Tools required for installation:

 Drill with 3/16” bit, hammer, screwdriver

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 valve or system control to test operation; this will damage your thermostat 

and void your warranty

•  All wiring must conform to local and national electrical and building codes
•  Do not use air conditioning when the outdoor temperature is below 50 degrees; this can damage your A/C system 

and cause personal injuries

•  Use this thermostat only as described in this manual

To Remove Existing Thermostat

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 and cooling system by removing the fuse or switching the appropriate circuit 

breaker off.

2.  Remove cover of old thermostat. This should expose the wires.
3.  Label the existing wires with the enclosed wire labels before removing wires.
4.  After labeling wires, remove wires from wire terminals.
5.  Remove existing thermostat base from wall.
6.  Refer to the following section for instructions on how to install this thermostat.

To Install Thermostat

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.
IMPORTANT:

 

Thermostat installation must conform to local and national building and electrical codes and 

ordinances.

 

 

Note:

 

Mount the thermostat about five feet above the floor. Do not mount the thermostat on an outside wall, in 

direct sunlight, behind a 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 the appropriate circuit breaker 

off.

2. To remove cover, pull gently at the seam at the top.
3. Put thermostat base against the wall where you plan to mount it (Be sure wires will feed through the wire opening 

in the base of the thermostat).

4. Mark the placement of the mounting holes.
5. Set thermostat base and cover away from working area.
6. Using a 3/16” drill bit, drill holes in the places you have marked for mounting.
7. Use a hammer to tap supplied anchors in mounting holes.
8. Align thermostat base with mounting holes and feed the control wires through slit in thermal intrusion barrier and 

into wire opening.

9. Use supplied screws to mount thermostat base to wall.
10. Insert stripped, labeled wires in matching wire terminals. 
 

CAUTION!

Be sure exposed portion of wires does not touch other wires.

11.  Gently tug wire to be sure of proper connection. Double check that each wire is connected to the proper 

terminal. 

12. Turn on power to the system at the main service panel.
13. Configure thermostat to match the type of system you have.
14. Replace cover on thermostat by snapping it in place.
15. Test thermostat operation as described in “Testing the Thermostat”.

Parts Diagram

Configuration 

switch

Reset switch

Left (system) button

Right (fan) button

Down button

Up button

Field programming pins

Icon Descriptions

Cooling operation icon

Fan operation icon

Heating operation icon

Lock mode activated

Room temperature 
offset activated

S1 S2 R

C

W

O/B

G

Y1 W2 Y2

RESET

CONFIG

FP

Terminal Designator Descriptions

1

ST

 Cool

2

ND

 Cool

1

ST

 Heat

2

ND

 Heat

Heat/Cool

Y1,G

YI,Y2,G

W1,G*

W1,W2,G*

Heat Pump (One Compressor)

Y1,G,O

Y1,G,O

Y1,G,B

Y1,W2,G,B

Heat Pump (Two Compressors)

Y1,G,O

Y1,Y2,G,O

Y1,G,B

Y1,Y2,G,B

Emergency Heat (Heat Pump Only)

N/A

N/A

W2,G

W2,G

* G not energized when configured as a gas/oil system

The 

SC5811

 thermostat is configurable for all systems. The configuration directly affects the outputs.

Use the output chart to correctly configure and wire the thermostat to your system.

SC5811 Output Chart

Configuration Mode

OFF

PM

1.  Verify the 

SC5811

 is in the 

OFF

 mode.

 

Press the 

SYS

 (left) button until off mode displays.

2.  Remove the cover of the thermostat by gently pulling near one of the corners at 

the top of the thermostat.

3.  Press the 

CONFIG

 button for 1 second while the 

SC5811

 is in 

OFF 

mode.

To exit configuration mode, press the 

CONFIG

 switch for 1 second.

Press the 

up

 or 

down

 button to change settings within each screen.

Down button

Up button

Press the 

right

 button to advance to the next screen.

 

Note:

 

Pressing the 

left

 button will return you to the previous screen.

Left 

button

Right 

button

The configuration mode is used to set the 

SC5811

 to match your heating/cooling system. The 

SC5811

 functions with 

heat pump, air conditioning, gas, oil or electric heat systems.
To configure the 

SC5811

, perform the following steps:

CONFIG

S1 S2 R

C

W

O/B

G

Y1 W2

W3

Y2

RESET

CONFIG

FP

 

R  –  24 VAC hot

 

C  –  24 VAC common

  W1/O/B  –  Configurable
 

W1 –  1st stage heat for non-heat pump systems

 

O –  cool active reversing valve

 

B –  heat active reversing valve

 

Y1  –  1st stage cool, 1st stage heat for heat pumps

 

W2  –  2nd stage heat for non-heat pump systems, emergency heat for heat pump systems

 

Y2  –  2nd stage cool for 2 compressor systems, 2nd stage heat for 2 compressor heat pump systems 

 

G  –  Fan

Configuration Mode Settings

The setup screens for Configuration Mode are as follows:

1. 

Temperature Scale 

(F or C)

 

Choose Fahrenheit or Celsius.

  Press the 

up

 or 

down

 button to select.

  Press the 

right

 button to advance to the next screen.

2. 

1

st

 Stage Temperature Differential

 (1°F to 5°F) (0.5°C to 2.5°C)

Set the number of degrees between your “setpoint” temperature and your “turn on” 
temperature.

  Press the 

up

 or 

down

 button to set differential value.

  Press the 

right 

button to advance to the next screen.

3. 

2

nd

 Stage Temperature Differential

 (1°F to 5°F) (0.5°C to 2.5°C) 

  Set the number of degrees between when stage 1 turns on and when stage 2 turns on.
  Press the 

up

 or 

down

 button to set differential value.

  Press the 

right 

button to advance to the next screen.

4. 

Staged Off Outputs

  

  Select whether the outputs for heating and cooling are staged off independently or 

are satisfied simultaneously.

  1 = outputs staged off independently     
  0 = outputs off simultaneously
  Press the 

up

 or 

down

 button to set.

  Press the 

right 

button to advance to the next screen.

5. 

Minimum Deadband

 (1°F to 9°F) (1°C to 5°C) 

  Set the minimum separation between heat setpoint and cool setpoint in 

Auto 

Changeover

 Mode.

  Press the 

up

 or 

down

 button to set deadband value.

  Press the 

right 

button to advance to the next screen.

7.  Auxiliary Delay ON

 – (0-30 minutes) – Set the delay time in minutes for auxiliary heat 

to be locked out after a call for second stage. This extra savings feature is used to 
temporarily lock out auxiliary heat devices, allowing just heat pump to try to satisfy heat 
call.

 

Press the 

up

 or 

down

 button to select.

 

Press

 

the 

right 

button to advance to the next screen.

8. 

Lockout (0-8°, NITE, COOL-HEAT) –

 Select the number of degrees set temperature 

can be changed during keypad lockout or select to lockout during 

NITE

 period only. 

COOL-HEAT

 lockout allows adjustment of the set temperatures to the maximum heat 

set temperature selected in Step 9 and minimum cool set temperature selected in 
Step 10.

 

 

Note:

 

The mode cannot be changed when the thermostat is locked.

 

Press the 

up

 or 

down

 button to select.

 

Press the 

right

 button to advance to the next screen.

9. 

Maximum Heat Setpoint

 (45°F to 90°F) (7°C to 32°C) 

 

Adjust to control the maximum heat set temperature allowed.

 

Press the 

up

 or 

down

 button to select.

 

Press the 

right

 button to advance to the next screen.

10. 

Minimum Cool Setpoint

 (45°F to 90°F) (7°C to 32°C) 

 

Adjust to control the minimum cool set temperature allowed.

 

Press the 

up

 or 

down

 button to select.

 

Press the 

right

 button to advance to the next screen.

13. 

Temperature Sensor

 (1-4) 

 

1.  Only on-board sensor determines room temperature.

 

2.  Only remote sensor determines room temperature.

 

3.  Average temperature of on-board and remote sensor.

 

4.  Only on-board sensor will be used until NITE period, and then only  

remote sensor is used.

 

 

Note:

 

If there is no remote sensor, option 1 must be selected.

 

Press the 

up

 or 

down

 button to select.

 

Press the 

right

 button to advance to the next screen.

12. 

Maximum Cycles Allowed Per Hour

 (- -, 2-6) 

 

  - - = as many as needed, 2-6 = maximum cycles/hour

 

Press the 

up

 or 

down

 button to select.

 

Press the 

right

 button to advance to the next screen.

11. 

Room Temperature Offset

 (+9°F to -9°F) (+4.5°C to -4.5°C) 

 

Adjust to calibrate displayed room temperature to match actual room temperature. 

 

 

Note:

 

When not set to 0, 

 

will display.

 

Press the 

up

 or 

down

 button to select.

 

Press the 

right

 button to advance to the next screen.

6. 

System

 – Set for heat pump, non-heat pump, reversing valve operation and number of compressors in your 

system.

 

Press the 

up

 or 

down

 button to select.

 

Press the 

right

 button to advance to the next screen.

Choose

System

Reversing Valve 

Active

Number of Compressors 

or Compressor Stages

Type of 

Heat

Heat Pump

HP

O

1

HP

b

1

HP

O

2

HP

b

2

Non-Heat 

Pump

Heat

Gas

Heat

Electric

OFF

14. 

Cooling Fan Delay Off Time

 (0, 30, 60, 90 seconds) 

 

Select the fan purge time for cooling.

 

Press the 

up

 or 

down

 button to select.

 

Press the 

right

 button to advance to the next screen.

Wiring Diagrams

120 

VAC

24 VAC

Heat #1

Cool #1

Heat #2

Cool #2

Fan

Transformer

Heat/Cool Systems

Optional 

remote or 

outdoor sensor

* outdoor sensor only reads outdoor temperature

120 

VAC

24 VAC

Reversing Valve

Fan

Compressor

Auxiliary Heat #1

Single Compressor 

heat pump with electric backup

Dual Compressor 

heat pump with electric backup

120 

VAC

24 VAC

Reversing Valve

Compressor #1

Emergency Heat

Fan

Compressor #2

Transformer

Optional 

remote or 

outdoor sensor

Transformer

Optional 

remote or 

outdoor sensor

* outdoor sensor only reads outdoor temperature

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