background image

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

SC2000/SC2001

Non-Programmable Electronic Thermostats

•  Permanent Memory
•  Controls Single Stage Heating/

Cooling Systems

•  Single Stage Heat Pump Systems
•  Compatible with Gas, Oil or Electric 

Systems

•  Millivolt and Hydronic (water or 

steam) System Compatible

•  Mercury-Free, Environmentally Safe

SET
ROOM
LO BAT
DIFF

Low battery signal
Temperature 

differential setting

Room temperature

Room temperature 

setpoint

Specifications

SC2000 

SC2001

Input: 

Input:

 

• 

Voltage:

 Millivolt to 30 VAC/VDC 

• 

Voltage:

 18-30 VAC 

• 

DC Power:

 3 volts (2 “AA” alkaline batteries included)

Output:

 

• 

Maximum:

 1 amp per terminal (3 amp total for all terminals) 

• 

Temperature control ranges: 

45°F to 90°F (7°C to 32°C)   

   

Accuracy:

  ± 1°F (± 0.5°C)

• 

Differential range: 

1°F to 3°F (0.5°C to 1.5°C)

• 

System configurations:

 

Single-stage heat, single-stage cool or single-stage heat 
pump, gas, oil, electric

• 

Compressor delay: 

4 minutes

• 

Terminations (SC2000):

 RC, RH, W, Y, O, B, G

• 

Terminations (SC2001):

 R, W, Y, O, B, G, C

Important Safety Information

•  Always turn off the thermostat before installing, removing, cleaning, or servicing; turn off the power at the main 

power source by unscrewing fuse or switching off circuit breaker 

•  Do not switch to “Cool” if room temperature is below 50°F (10°C); this could damage your A/C system and cause 

injury 

•  Do not install on voltages higher that 30 VAC

•  All wiring must conform to local and national building and electrical codes and ordinances

•  While cleaning, do not get soap directly on thermostat switches or LCD readout; only use a damp cloth with a mild 

soap to wipe outside of thermostat cover

General Description

•  The SimpleComfort® thermostat is a 

digital, mercury-free, non-programmable, electronic thermostat

 

•  Compatible with single-stage 

heating systems, heating/cooling systems

, and 

heat pump systems

; works with 

gas, oil, 

or

 electric

 systems 

•  Compatible as a 

master thermostat

 in zoned system applications 

• 

Freeze Protection Feature (SC2000 only):

 Protects pipes from freezing! If the room temperature drops to 40°F, 

the thermostat automatically turns on the heat; the thermostat must be in the Heat position; works even if the 
batteries are dead 

• 

Built-in Compressor Protection for Air Conditioners:

 To protect the A/C’s compressor, there is a 4-minute 

delay between the system turning off and the A/C starting

• 

System Customization:

 Choose 

Fahrenheit

 or 

Celsius

 display; three available 

temperature differential 

settings

Package Contents/Tools Required

Package includes:

 SimpleComfort

®

 non-programmable thermostat on base, thermostat cover, wiring labels, screws 

and wall anchors, batteries (if applicable), Installation, Operation and Application Guide.

Tools required for installation:

 Drill with 3/16” bit, hammer, screwdriver.

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 off the appropriate circuit 

breaker.

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 off the appropriate circuit 

breaker. Move the 

Cool/OFF/Heat

 switch to 

OFF

.

2.  Move the 

FAN AUTO/ON

 switch to 

AUTO

.

3.  To remove cover, insert and twist a coin or screwdriver in the slots on the top of the thermostat.

4.  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).

5.  Mark the placement of the mounting holes.

6.  Set thermostat base and cover away from working area.

7.  Using a 3/16” drill bit, drill holes in the places you have marked for mounting.

8.  Use a hammer to tap supplied anchors into mounting holes.

9.  Align thermostat base with mounting holes and feed the control wires through wire opening.

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

 

CAUTION!

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

11.  Tighten screws on terminal block. Gently tug wire to be sure of proper connection. Double check that each wire 

is connected to the proper terminal.

 

CAUTION!

Remove RH/RC jumper for 2 transformer system (

SC2000

 only).

12.  Set the 

fan jumper

 to 

electric

 or 

gas/oil

.

13.  Install two “AA” alkaline batteries (

SC2000

 only). 

14.  Replace cover on thermostat by snapping it in place.

15.  Turn on power to the system at the main service panel.

Installing and Changing Batteries (SC2000 only)

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 and whenever the 

LO BAT 

warning displays. 

Step 1:

  Move the 

Cool/Off/Heat

 switch into the 

Off

 position.

Step 2:

  Move the 

Fan Auto/On

 switch into the 

Auto

 position.

Step 3:

  Remove the cover, and install the two “AA” alkaline batteries into the battery compartment. Proper battery 

installation is important! Make sure the positive ends of the batteries match the positive terminals in the 
battery compartment. 

If the display is on, the batteries are installed properly.

Replacing Wiring Labels

Replace the old labels with the enclosed new labels:

Old

New

Type

F, G

G

Fan control relay

O

O

Cool active reversing valve

B

B

Heat active reversing valve

Y, Y6

Y

Cooling control

H, W, 4

W

Heating control

C

Transformer, common side

M, 4, RH, RS, R

R

Transformer, hot side

C

Y or C

If the C terminal is the cooling control, connect to Y terminal; if it is the 
common side of the transformer, connect to C terminal

SC2000 – 

Zone Valve/Damper Motor Systems

3-Wire, Zone Valve/Damper Motor System

2-Wire, Zone Valve/Damper Motor System

RH RC W Y B O G

RH RC

Y B

G

RH RC

Y B O G

RH RC W Y

O G

RH RC W Y

O G

RH RC W Y B O

Zone 1

Zone 3

Zone 2

Zone 1

Zone 3

Zone 2

24 VAC

Use appropriate 

size, single pole/

double throw relay

 

Note:

 

Differential temperature may need to be increased for zone/damper system 

*

*

Wiring Diagrams

4-Wire, Single Transformer

HOT

120 VAC

24 VAC

Transformer

Heating 

Control

HOT

RH

RC

W

Y

B

O

G

120 VAC

24 VAC

Remove 

Pre-Installed 

Jumper

Cooling 

Control

Fan 

Control

(Cooling)

Transformer

HOT

120 VAC

24 VAC

T

 

Note:

 

Both transformers must be in phase

5-Wire, Two Transformer

Pre-Installed Jumper

RH  RC

RH  RC

Cooling 

Control

Fan 

Control

SC2000 – 

Heating/Cooling

Parts Diagrams

SC2000

SC2001

Electric/Gas 
Jumper

Mode 

Switch

Fan 

Switch

Electric/Gas 
Jumper

Mode 

Switch

Fan 

Switch

Freeze 
Switch

RH RC Jumper

SC2001

SC2000

R

W

Y

B

O

G

GAS
ELEC

RC

RH

W

Y

B

O

G

GAS
ELEC

Battery Compartment

For Vertical and Horizontal Models

T

RH

RC

W

Y

B

O

G

All manuals and user guides at all-guides.com

all-guides.com

Reviews: