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ONE-YEAR LIMITED WARRANTY

The Seller warrants its products against defects in material or workmanship for a period of one (1) year from the 
date of manufacture. The liability of the Seller is limited, at its option, to repair, replace or issue a non-case credit for 
the purchase prices of the goods which are provided to be defective. The warranty and remedies set forth herein 
do not apply to any goods or parts thereof which have been subjected to misuse including any use or application 
in violation of the Seller’s instructions, neglect, tampering, improper storage, incorrect installation or servicing not 
performed by the Seller. In order 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 inspection fee. This warranty 
constitutes the Seller’s sole liability hereunder and is in lieu of any other warranty expressed, implied or statutory. 

Unless otherwise stated in writing, Seller makes no warranty that the goods depicted or described herein are fit for 

any particular purpose.

LIAF020

Patent No. - Design: 424,953

Patent No. - Thermal Intrusion Barrier: 6,597,275

Patent Pending - SimpleSet

TM

 Target Programming Technology

7313 William Barry Blvd., North Syracuse,  NY  13212

(

Toll Free) 800-365-5525     (Phone) 315-233-5266     (Fax) 315-233-5276

www.icmcontrols.com

Table of Contents

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, insert and twist a coin or screwdriver in the slots on the top corner of the thermostat.
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.

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 Remove Existing Thermostat

2-Stage Heat/ 2-Stage Cool 

Manual Changeover

Hardwired

SC3211L

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

Specifications

 ...............................................................................................................................................................1

Important Safety Information ........................................................................................................................................1
Package Contents/Tools Required ...............................................................................................................................1
To Remove Existing Thermostat ...................................................................................................................................2
To Install Thermostat ....................................................................................................................................................2

Wiring Diagrams

 ...........................................................................................................................................................4

  Single Compressor, Cool Active .................................................................................................................................4

  Dual Compressor, Cool Active

 ....................................................................................................................................4

  Single Compressor, Heat Active .................................................................................................................................5

  Dual Compressor, Heat Active

....................................................................................................................................5

Parts Diagram

...............................................................................................................................................................6

Operation ......................................................................................................................................................................6
Setting the Setpoint Temperature .................................................................................................................................6

Configuration Mode

 ......................................................................................................................................................7

Configuration Mode Settings

 ........................................................................................................................................8

Starting the Thermostat ..............................................................................................................................................11
Testing the Thermostat ...............................................................................................................................................12
Operating Modes ........................................................................................................................................................13

Setting the Time and Day of the Week

 .......................................................................................................................14

Programming ..............................................................................................................................................................15
Lockout Feature..........................................................................................................................................................16
Factory Preprogramming ............................................................................................................................................17
Personal Program Schedule.......................................................................................................................................17
SimpleSetTM Field Programming...............................................................................................................................19
Troubleshooting ..........................................................................................................................................................20

Specifications

Electrical rating:

 

• 18-30 VAC 
• 1 amp maximum per terminal 
• 4 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

Terminations:

 R, C, Y1, Y2, W2, O, B, G, L, E

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
•  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

Package Contents/Tools Required

Package includes:

 SimpleComfort

®

 

SC3211L

 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.

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 wire opening.

9.  Use supplied screws to mount thermostat base to wall.

10.  Insert stripped, labeled wires in matching wire terminals. See “Wiring Diagrams” section of this manual 

 

(Pages 4-5).

 

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.  Replace cover on thermostat by snapping it in place.
13.  Turn on power to the system at the main service panel.

14.  Test thermostat operation as described in “Testing the Thermostat” (Page 12).

Lockout Feature

From any of the screens on Page 15, you can press the

 HOLD 

(right) button to begin entering your program 

schedule. The days shown on the display will all be programmed simultaneously.

Once the

 HOLD 

(right) button is pressed, 

MORN

 blinks.

Use the up or down button to select a different period (

MORN

DAY

EVE

NITE

).

Press

 HOLD 

(right) button to advance to the next screen. Transition time hour blinks.

Use the up or down button to select a different hour. 

Press

 HOLD 

(right) button to advance to the next screen. Transition time minutes blink.

Use the up or down button to select different minutes. 

Press

 HOLD 

(right) button to advance to the next screen. Heat set temperature displays.

Use the up or down button to adjust the heat set temperature.

Press

 HOLD 

(right) button to advance to the next screen. Cool set temperature displays.

Use the up or down button to adjust the cool set temperature.

Repeat above steps to program the four periods per day.

When the program schedule is complete, press and hold the 

PROG

 and

 HOLD 

buttons (pressed simultaneously) in 

for 2 seconds to return to the 

OFF

 mode.

The 

SC3211L

 has a button lockout feature so the mode cannot be changed and the 

temperature adjustment is limited. Select the appropriate lockout from Configuration 

Mode Settings (Step 6, Page 9) of this guide.
To activate the LOC feature:
1.  Simultaneously press the 

PROG

,

 HOLD 

and 

UP

 buttons for 10 seconds.

2.  LOC will display and the lockout function will be enabled.
To deactivate the LOC feature, repeat steps 1 and 2 above.

Factory Preprogramming

MORN

6:00 AM

DAY

8:00 AM

EVE

6:00 PM

NITE

10:00 PM

HEAT

70°F

HEAT

62°F

HEAT

70°F

HEAT

62°F

COOL

78°F

COOL

85°F

COOL

78°F

COOL

82°F

MONDAY

thru

SUNDAY

Personal Program Schedule

MORN

DAY

EVE

NITE

HEAT

HEAT

HEAT

HEAT

COOL

COOL

COOL

COOL

MONDAY

1

MORN

DAY

EVE

NITE

HEAT

HEAT

HEAT

HEAT

COOL

COOL

COOL

COOL

MORN

DAY

EVE

NITE

HEAT

HEAT

HEAT

HEAT

COOL

COOL

COOL

COOL

WEDNESDAY

3

TUESDAY

2

The 

SC3211L

 comes preprogrammed with the following schedule:

Use the following personal program schedule to record your settings:

MORN

DAY

EVE

NITE

HEAT

HEAT

HEAT

HEAT

COOL

COOL

COOL

COOL

THURSDAY

4

MORN

DAY

EVE

NITE

HEAT

HEAT

HEAT

HEAT

COOL

COOL

COOL

COOL

FRIDAY

5

MORN

DAY

EVE

NITE

HEAT

HEAT

HEAT

HEAT

COOL

COOL

COOL

COOL

MORN

DAY

EVE

NITE

HEAT

HEAT

HEAT

HEAT

COOL

COOL

COOL

COOL

SUNDAY

7

SATURDAY

6

SimpleSet

TM

 Field Programming

This feature is used for transferring configuration and program schedule from the master to the target thermostat. 
All thermostats for a job can be mounted and powered up. Configure and program one thermostat. This will be the 

master. The master will be used to copy the program to the rest of the thermostats.

Preparing the master to Send:

1.  The master must be powered by 24 VAC.
2.  Verify the master thermostat is in 

OFF

 mode. Slide system switch to center position.

3.  Remove cover of the master thermostat by gently pulling near one of the corners at the top 

of the thermostat.

4.  Press the 

up

 and 

down

 buttons and 

CONFIG

 switch simultaneously for 5 seconds.

5.  The 

OUT

 screen displays indicating the master thermostat is ready to 

transfer data.

 

 

Note:

 Press the 

up

 and 

down

 buttons and 

CONFIG

 switch simultaneously for 5 seconds 

to exit from data transfer mode and to return the master to the 

OFF

 mode.

6.  Connect the master to the target using the 3 wire connector. Attach one end to the Master’s 

FP pins and the other end to the Target’s FP pins.

 

 

Note:

 

Target thermostat must be powered by 24 VAC for field programming to occur

When the connection has been made correctly, the master thermostat will power up and the target will count from 6 
down to 1. It will then display 

LOC

 confirming the data has been saved in memory.

When all target thermostats have been completed, reinstall the master thermostat.
Press the 

up

 and 

down

 buttons and the 

CONFIG

 switch simultaneously for 5 seconds to exit from the data transfer 

mode and to return the master thermostat to the 

OFF

 mode.

OFF

Troubleshooting

* Reset Button Function:

 Time, day and program/non-program changed to last saved settings (saved after 

program or configuration change), configuration and program unchanged, ASC timer 

reset to 0.

Symptom

Remedy

No display

Verify 24 VAC is at thermostat

System fan does not come on properly

Verify wiring is correct

Program schedule activates at the wrong 
time

Check time (AM/PM) set on thermostat (see “Setting the Time,” 

Page 14)

Thermostat turns on and off too frequently

Adjust temperature differential (see “Configuration Mode Settings,” 

Page 8)

Thermostat does not follow program

Verify it is operating in Program mode (PROG solid in display); 
check time (AM/PM); check if in Hold mode (PROG flashes)

“PROGram” flashes (in Hold mode)

Press Hold button to remove from Hold mode (PROG solid)

Fan runs continuously

Check Fan Auto/On switch, continuous fan operation in ON

Problem not listed above

Press reset button once*

•  7-Day Programmable
•  2-Stage Heat Pump
•  Manual Changeover
• 

SimpleSet

®

 Target Programming

•  Selectable °F or °C
•  Relay Outputs 

 

(minimum voltage drop in thermostat)

•  Ideally Suited for Residential

 

 

– 

Residential (New Construction/Replacement), 

    Light Commercial

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