ICM Controls SC 2000 Instruction manual

Manual Changeover
Non-Programmable
Battery
SC 2000
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
• 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

Table of Contents
Parts Diagram ............................................................................................................................. 1
Specifications .............................................................................................................................. 2
Important Safety Information ..................................................................................................... 2
Package Contents/Tools Required............................................................................................... 3
General Description..................................................................................................................... 3
To Remove Existing Thermostat ................................................................................................ 4
To Install Thermostat .................................................................................................................. 4
Installing and Changing Batteries................................................................................................ 6
Replacing Wiring Labels .............................................................................................................. 6
Operation .................................................................................................................................... 7
A Quick Test................................................................................................................................ 8
Wiring Diagrams.......................................................................................................................... 9
Troubleshooting ........................................................................................................................ 13
CAUTION! : This thermostat should be installed by trained technicians only. Adhere to all local
and national codes. Disconnect all power to the system before installing, removing,
or cleaning.

1
Parts Diagram
Mode Switch Fan Switch
Electric/Gas
Switch
Battery
Compartment
Heat Pump/
Non-Heat
Pump Jumper
Celsius/
Fahrenheit
Jumper
WRC RH YBOG
HEATCOOL OFF
ONAUTO
ELECTRIC
GAS
2000
F–C
NON–HP
HP
High Temperature
Switch
Freeze Switch

2
Important Safety Information
Input:
• Voltage: Millivolt to 30 VAC/VDC
• 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
• Terminations: RC, RH, W, Y, O, B, G
SET
ROOM
LO BAT
DIFF
Low battery signal
Temperature
differential setting
Room temperature
Room temperature
setpoint
• 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
Specications

3
Package Contents/Tools Required
Package includes: SimpleComfort®2000 non-programmable 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.
• The SimpleComfort®2000 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: 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 5-minute
delay between the system turning off and the A/C starting
• System Customization: Choose Fahrenheit or Celsius display; three available temperature differential
settings
General Description

4
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.
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 .
To Install Thermostat

5
To Install Thermostat (continued)
2. To remove cover, insert and twist a coin or screwdriver in the slots on the sides of the thermostat.
3. Move the FAN AUTO/ON switch to AUTO.
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.
12. Seal hole for wires behind thermostat with non-flammable insulation or putty.
13. Set the fan switch to electric or gas/oil, and heat pump jumper to NON-HP or HP.
14. Set the temperature scale jumper to Fahrenheit or Celsius.
15. Install two “AA” alkaline batteries.
16. Replace cover on thermostat by snapping it in place.
17. Turn on power to the system at the main service panel.

6
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, you have to reset the room temperature setting and the
differential setting.
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.
Installing and Changing Batteries
Replace the old labels with the enclosed new labels:
Replacing Wiring Labels
Old New Type
F, G G Fan control relay
Cool active reversing valve
Heat active reversing valve
Cooling control
H, W, 4 Heating control
Cooling transformer, hot side
Heat transformer, hot side
If the C terminal is the cooling control, connect to Y terminal; if it is the
common side of the transformer, cap the wire and tuck into the wall

7
Setting the Room Temperature (Setpoint Temperature)
Step 1: Press one of the arrow buttons; the current temperature setting displays.
Step 2: Press the or arrow button until the desired temperature setting displays.
The new temperature setting is automatically saved. After 5 seconds, the display returns to showing the
current room temperature.
Setting a New Temperature Differential
The default temperature differential is 1°. When your room temperature varies by 1°F, the thermostat
turns your system on. If you notice your system turning on and off too frequently, increase the
temperature differential.
Step 1: Reset thermostat by removing batteries for 10 seconds.
Step 2: For the first 10 seconds of operation, the temperature differential is displayed.
Press the or arrow button to select desired setting.
Changing Fahrenheit to Celsius
The temperature displays in degrees Fahrenheit as a factory set default. Follow these steps to change to
degrees Celsius:
Step 1: Remove cover and batteries.
Step 2: Move the jumper select marked Fand C(see Parts Diagram, Page 1).
Step 3: Reinstall batteries and cover.
Your LCD readout changes accordingly.
Starting the Thermostat
Step 1: Move the Fan Auto/On switch into the Auto position.
Step 2: Move the Cool/Off/Heat switch to Cool or Heat, depending on the season.
Operation

8
CAUTION! : Do not switch system to cool if the temperature is below 50°F (10°C). This
can damage the air conditioning system and may cause personal injury.
Do not short jumper across terminals on the gas valve or at the system control to test installation.
Action: Set the Cool/Off/Heat switch to Cool. Press the button until the temperature
setting is 3°F below the room temperature.
Result: The A/C system and fan should turn on.
Action: Set the Cool/Off/Heat switch to Off.
Result: The A/C should turn off (There may be a fan delay).
Action: Set the Cool/Off/Heat switch to Heat. Press the button until the temperature
setting is 3°F above the room temperature.
Result: The heating system and fan should turn on (There may be a time delay depending on your
system).
Action: Set the Cool/Off/Heat switch to Off.
Result: The heating system should turn off (There may be a fan delay).
Action: Set the Fan Auto/On switch On.
Result: The blower fan should turn on.
Action: Set the Fan Auto/On switch to Auto.
Result: The blower fan should turn off.
If the above test was successful, you have a proper installation.
If not: Double check that wires are securely connected and are connected to the proper terminals. Consult
the troubleshooting section ( see Page 13 ).
A Quick Test

9
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 W Y B O GRH RC W Y B O G
RH RC W Y B O G RH RC W Y B O GRH RC W Y B O G
Zone 1 Zone 3Zone 2
Zone 1 Zone 3Zone 224 VAC
24 VAC
* Use appropriate
size, single pole/
double throw relay
Note: Differential temperature may need to be increased for zone/damper system
* **
Wiring Diagrams

10
Heating/Cooling
4-Wire, Single Transformer
HOT
120 VAC 24 VAC
Pre-Installed Jumper
Transformer
Heating
Control
Cooling
Control
Fan
Control
T
H
E
R
M
O
S
T
A
T
RH
RC
W
Y
B
O
G
HOT RH
RC
W
Y
B
O
G
120 VAC 24 VAC
Remove
Pre-Installed
Jumper
Heating
Control
Cooling
Control
Fan
Control
(Heating)
Transformer
(Cooling)
Transformer
HOT
120 VAC 24 VAC
T
H
E
R
M
O
S
T
A
T
Note: Both transformers must be in phase
5-Wire, Two Transformer

11
Heating Only
3-Wire, Single Transformer
HOT
120 VAC 24 VAC
Transformer
Heating
Control
Fan
Control
T
H
E
R
M
O
S
T
A
T
RH
RC
W
Y
B
O
G
Remove
Pre-Installed
Jumper
Heating
Control
T
H
E
R
M
O
S
T
A
T
RH
RC
W
Y
B
O
G
Remove
Pre-Installed
Jumper
Thermopile
or
Transformer
2-Wire, Single Transformer or Millivolt

12
Cool OnlyHeat Pump
T
H
E
R
M
O
S
T
A
T
RH
RC
W
Y
B
O
G
Pre-Installed
Jumper
T
H
E
R
M
O
S
T
A
T
RH
RC
W
Y
B
O
G
Pre-Installed
Jumper
Remove
Pre-Installed
Jumper
T
H
E
R
M
O
S
T
A
T
RH
RC
W
Y
B
O
G
HOT
120 VAC 24 VAC
Transformer Transformer
HOT
120 VAC 24 VAC
Transformer
HOT
120 VAC 24 VAC
Compressor
Contactor
Fan
Relay
Reversing
Valve
Compressor
Contactor
Fan
Relay
Reversing
Valve
Cooling
Control
Fan
Control
Cool Active
Reversing Valve
Heat Active
Reversing Valve
3-Wire,
Single Transformer
Note: Place jumper between “W” and “Y” terminals. Note: Millivolt system may require a
transformer and/or an isolation
relay to operate properly

13
Symptom Remedy
The system isn’t turning on Check the wiring (see Installation, Page 4)
Check the batteries
LCD is blank, or displaying “LO BAT” Replace batteries, or make sure the existing ones are properly installed
(see Installing and Changing Batteries, Page 6)
Thermostat is not properly controlling the fan Check that the fan switch setting matches your system (gas or
electric)
Thermostat is continuously turning on and off Increase the temperature differential (see Setting a New Temperature
Differential, Page 7)
Temperature displayed is not accurate Your thermostat has two options for temperature readout: Fahrenheit
(default) or Celsius; check that the “jumper” is properly set to your
preference
Plug the hole for wiring behind the thermostat with non-flammable
insulation to prevent airflow into the thermostat
Troubleshooting

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.
LIA166-2
Patent No. 424,953
7313 William Barry Blvd., North Syracuse, NY 13212
(Toll Free) 800-365-5525 (Phone) 315-233-5266 (Fax) 315-233-5276
www.icmcontrols.com