ICM Controls SC 5812 User manual

3 Heat/2 Cool
Auto Changeover
Hardwire
SC 5812
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
• 7-Day, 5-2-Day or 5-1-1-Day Programmable
• Configurable
• 3-Stage Heat/2-Stage Cool Systems
• 3-Stage Heat Pump Systems
• Large Display With Backlight
• Selectable Fahrenheit or Celsius
• Compatible with Gas, Oil, or Electric
• Dual Fuel Compatible
• 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

Table of Contents
PartsDiagram ............................................................................1
IconDescriptions..........................................................................2
Specifications.............................................................................2
ImportantSafetyInformation ................................................................3
PackageContents/ToolsRequired.............................................................3
ToRemoveExistingThermostat..............................................................3
ToInstallThermostat.......................................................................4
WiringDiagrams...........................................................................5
Heat/CoolSystems.......................................................................5
SingleCompressorheatpumpwithelectricbackup..............................................6
DualCompressorheatpumpwithelectricbackup...............................................6
SingleCompressorheatpumpwithgas/oilbackup ..............................................7
DualCompressorheatpumpwithgas/oilbackup ...............................................7
RemoteSensorInstallation(Optional)..........................................................8
Terminal Designator Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
SC5812 Output Chart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
ConfigurationMode.......................................................................10
ConfigurationModeSettings................................................................11
RemoteSensorWhenUsedasOutdoorSensor .................................................15
HeatPumpwithElectricBackup ...........................................................15
HeatPumpwithGas/OilBackup............................................................15
ModeofOperation........................................................................19
ButtonFunctions.........................................................................20
OperatingModes.........................................................................21
TestingtheThermostat....................................................................24
SettingtheTimeandDayoftheWeek ........................................................25
Programming............................................................................26
LockoutFeature..........................................................................28
FactoryPreprogramming...................................................................29
PersonalProgramSchedule.................................................................29
SimpleSetTM FieldProgramming..............................................................31
Troubleshooting..........................................................................32

1
Parts Diagram
S1 S2 R C W
O/B GY1 W2 W3Y2
RESET CONFIG
Configuration switch
Reset switch
Left (system)
button
Right (fan)
button
Down button
Up button
Field programming pins
FP

2
Specications
Icon Descriptions
Fan operation icon
Cooling operation icon
Heating operation icon
Lock mode
activated
Room
temperature
offset activated
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: 3-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, W3

3
Package Contents/Tools Required
Package includes: SC5812 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.

4
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 (see Page 13) 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” (Page 24).

5
Wiring Diagrams
120
VAC 24 VAC
Heat #1
Cool #1
Heat #2
Cool #2
Fan
Heat #3
Transformer
Heat/Cool Systems
Optional
remote or
outdoor sensor

6
120
VAC 24 VAC
Reversing Valve
Compressor
Auxiliary Heat #1
Fan
Auxiliary Heat #2
Single Compressor
heat pump with electric backup
Dual Compressor
heat pump with electric backup
120
VAC 24 VAC
Reversing Valve
Compressor #1
Auxiliary Heat
Compressor #2
Fan
Transformer
Optional
remote or
outdoor sensor
Transformer
Optional
remote or
outdoor sensor

7
Single Compressor
heat pump with gas/oil backup
Dual Compressor
heat pump with gas/oil backup
120
VAC 24 VAC
Reversing Valve
Compressor
Oil/Gas Heat
Fan
120
VAC 24 VAC
Reversing Valve
Compressor #1
Oil/Gas Heat
Fan
Compressor #2
Transformer
Optional
remote or
outdoor sensor
Transformer
Optional
remote or
outdoor sensor

Remote Sensor Installation (Optional)
Terminals S1 and S2 can be used for an outdoor sensor or for an indoor remote sensor.
The outdoor sensor is used to change system operation based on the outdoor temperature. It can be used for heat
pumps with gas/oil backup or heat pumps with electric backup.
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 17,
Page 17) or use it for an outdoor sensor for heat pump systems (see Page 9).
8
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.)