ICM Controls SC2201 Installation, Operation & Application Manual

SC2201
Non-Programmable Electronic Thermostats
• For use with Heat
Pumps
• Up to 2-Stage Heat,
1-Stage Cool
• 30-Minute Power
Loss Memory
Retention
• For use with 24 VAC
Systems
• Optional backlit
display (SC2201L and
SC2201VL only)
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
SC2201 Parts Diagrams
Reset
Switch
Mode
Switch
C R O W2 G
Reset Mode Switch
Switch
Specifications
Input:
• Voltage: 24 VAC (18-30 VAC)
Output:
• Maximum:
– 1 amp maximum load per terminal
– (4 amp total maximum load for all terminals)
• Temperature Ranges:
– Temperature control range: 45°F to 90°F Accuracy: ± 1°F
– Differential range: 1°F to 3°F
• System configurations: Multi-stage heat pump (two-stage heat, one-stage cool)
• Terminations: R, C, E, Y1, O, B, G, W2
• Second stage activation in heat mode: 2° below first stage (not adjustable)
Features/Benefits
• Multi-stage heating/cooling control
• Multi-colored LED indicators for system status
• Zone system compatible as a master thermostat
• Adjustable temperature differential: 1°F to 3°F
• Automatic heating system shutdown if temperature exceeds 90°F
• 30-minute power interruption memory retention
• Independent setpoints for heat and cool
Package Contents/Tools Required
Package includes: SC2201 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.
Important Safety Information
• Always turn off power at the main power source by unscrewing fuse or switching circuit breaker to
the off position before installing, removing, cleaning, or servicing this thermostat
• Read all of the information in this manual before installing this thermostat
• This thermostat should be installed only by a professional contractor
• This is a 24 VAC low-voltage thermostat; do not install on voltages higher than 30 VAC
• All wiring must conform to local and national building and electrical codes and ordinances
• Do not switch system to cool if the outdoor temperature is below 50°F; this can damage the air
conditioning system and may cause personal injury
• The thermostat will not control your heating/air conditioning system without power; it requires a
continuous 24 VAC circuit for proper system control
• Use this thermostat only as described in this manual
• 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 SC2201 is intended to operate and is compatible with 24 VAC residential heat pumps with up to
2-stage heat/1-stage cool. It will operate with heat pump systems that are manual changeover and
have auxiliary or emergency heating. There are no optional items required for standard installations.
This thermostat is also compatible as a master thermostat in zoned system applications.
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. See table
below for old and new label identification.
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.
Replacing Wiring Labels
Replace the old labels with the enclosed new labels:
E Y1
Old New
R, V-VR or VR-R R 24 VAC, return
Y, Y1 or M Y1 Stage 1 cooling/heating circuit
O or R O Reversing valve (cooling active)
B B Reversing valve (heat active)
Fan
Switch G or F G Fan contactor circuit
W1, W2 or W-U W2 2nd stage heating circuit
E E Emergency heating circuit
C, X or B C 24 VAC, transformer common side
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.
IMPORTANT: This thermostat is compatible with 100% lockout systems. To reset the system,
turn thermostat to Off position for at least 60 seconds.
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.
2. Put Mode switch in Off position. Mode
3. Put Fan switch in Auto position.
Cool Off Emer
4. To remove cover, insert and twist a coin or screwdriver
in the slot on the top of the thermostat.
5. 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).
6. Mark the placement of the mounting holes.
7. Set thermostat base and cover away from working area.
8. Using a 3/16" drill bit, drill holes in the places you have marked for mounting.
9. Use a hammer to tap supplied anchors in mounting holes.
10. Align thermostat base with mounting holes and feed the control wires through wire opening.
11. Use supplied screws to mount thermostat base to wall.
12. Insert stripped, labeled wires in matching wire terminals. See Wiring Diagrams section of this
manual.
CAUTION!: Be sure exposed portion of wires does not touch other wires.
13. 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.
14. Replace cover on thermostat by snapping it in place.
15. Turn on power to the system at the main service panel.
16. Test thermostat operation as described in the following section.
Configuration
Enter configuration by simultaneously pressing both the up and down buttons for 1 second while
in OFF mode. Use the up and down buttons to change the setting. Press both the up and down to
advance to the next configuration screen. Exit configuration by sliding the mode switch to Heat or
Cool mode.
• F/C – select to operate in Fahrenheit or Celsius
• 1st Stage Differential 1-5:
Default set to 1 degree. When heating or cooling turn on too frequently you can increase the
temperature differential. A larger differential results in longer run times.
Default
• 2nd Stage Differential 1-5:
Default set to 2 degrees. This applies only to 2nd stage heat.
Default
Type
• Staged off outputs:
Select whether the 2nd stage heat is turned off independently or turns off when the heat call ends.
2nd stage can turn on and
off while 1st stage is on
Default
Testing the Thermostat
CAUTION!: Do not switch system to cool if the outdoor temperature is below 50°F. This
can damage the air conditioning system and may cause personal injury.
1. Put the Mode switch to Cool position.
2. Press the DOWN button until the temperature setting is at least 3 degrees
below the room temperature. The air conditioning system and fan should turn
on.
3. Put the Mode switch in the Off position. The air conditioning system should
turn off. The fan may have a delay.
Fan
Note: Pressing the Reset button once will bypass the 5-minute anti-short
cycle compressor protection.
On
Note: While in Cool or Heat mode, once the thermostat turns the system off, a built-in delay
keeps the compressor from turning on for about 5 minutes. This protects the compressor.
4. Put the Mode switch to the Heat position.
5. Press the UP button until the temperature setting is at least 3 degrees above
room temperature. The heating system should turn on.
Note: The compressor may not turn on again for 5 minutes.
6. Put the Mode switch to the Off position. The heating system should turn off.
Once again the fan may have a delay.
7. Put the Fan switch to the On position. The blower fan should turn on.
8. Put the Fan switch to the Auto position. The blower fan should turn off.
If all functions operate properly, the thermostat is installed correctly.
If the thermostat does not operate properly:
• Check all wiring connections
• See Troubleshooting
There are two LED indicators located on the front of the thermostat. They are designed to inform you
of the following:
AUX (GREEN): This turns on when the auxiliary (back-up)
Default
heating is in operation. This is the second
(non-economy) stage of heat. It turns on
2 degrees below first stage and is not
adjustable.
EMER (RED): This light turns on whenever the
emergency heat is manually selected
(system switch is in the EMER position).
While in the emergency heat mode, the
heat pump compressor is off, and the
emergency heat (same as the auxiliary
heat) maintains the setpoint temperature.
Press the UP or DOWN button; the current temperature setpoint displays.
Press the UP or DOWN button until the desired temperature setpoint displays.
Holding down either the UP or DOWN button will scroll the
temperature display.
The new temperature setting is automatically saved. After 5 seconds, the display
returns to showing the current room temperature.
Setting a New Temperature Differential
IMPORTANT: The default temperature differential is factory set at 1°F. 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 accordingly.
Step 1: Remove cover. Insert a coin or screwdriver in slot at top if needed.
2nd stage turns off when
Step 1: Press the reset button once (see SC2201 Parts Diagrams).
1st stage turns off
Step 3: The display will show
This is the temperature differential setting.
Step 4: Press the UP or DOWN button to adjust the temperature differential down or up.
Step 5: Replace the thermostat cover.
The display will return to the room temperature display five
seconds after the last input. The new temperature differential
setting will be saved.
Starting the Thermostat
Step 1: Move the Fan switch into the Auto position.
Mode
• In Auto, indoor fan runs only during a heating or cooling cycle
• In ON, indoor fan runs continuously
Cool Heat Emer
Step 2: Move the Mode switch to either Cool or Heat position, depending on
the season. The thermostat will now operate and maintain the room
Mode
temperature at the desired setpoint.
Note: When the thermostat operates the system, there is built-in
Cool Off Heat Emer compressor protection. After the compressor turns off, the
system will not turn it back on for about five minutes. This
protects the compressor.
Mode
Cool Off Heat Emer
Mode
Cool Off Heat Emer
Fan
Auto On
Fan
Auto On
LED Indicators
Operation
Differential Setting °F
1 1°F
2 2°F
3 3°F
Fan
Auto
Mode
Cool Off Heat Emer