Manual Changeover
Non-Programmable
Battery
SC1800L/VL
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 Systems
• Millivolt and Hydronic (water or steam) System Compatible
• Compatible with Gas and Electric Systems
• Backlit Display
• Mercury-Free,
Environmentally Safe
• Freeze Protection
• Remote Sensor
Compatible
Specifications
Electrical rating:
• Millivolt to 30 VAC/VDC
• DC Power: 3.0 VDC (2 “AA” alkaline batteries included)
• 1 amp maximum per terminal
• 2 amp maximum total load
Temperature control range:
45°F to 90°F
Accuracy:
± 1°F
Back Light:
Not available on N and VN models
Differential Rage:
1°F to 3°F
System configurations:
1-stage heat, gas, oil, electric
Terminations:
R, W, G, S1, S2
Package Contents/Tools Required
Package includes:
SC1800
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.
General Description
The
SC1800
thermostat is a digital, mercury-free, non-programmable, electronic thermostat.
• Compatible with single-stage heating 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
•
System Customization:
Choose three available temperature differential settings
To Remove Existing Thermostat
1. Turn off power to the heating 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 sections for instructions on how to install this thermostat.
Replacing Wiring Labels
Replace the old labels with the enclosed
new labels.
Old
New
Type
F, G
G
Fan control relay
H, W, 4
W
Heating control
M, 4, RH, RS, R
R
Transformer, hot side
N/A
S1, S2
Optional remote sensor
Note:
Mount 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 system by removing the fuse or switching off the appropriate circuit
breaker.
2. Move the
Fan Auto/On
switch into
Auto
position.
3. To remove cover, insert and twist a coin or screwdriver in the slots on the sides 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 in 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.
11. 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.
12. 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.
13. Set the GAS/ELEC jumper to
Electric
or
Gas/Oil
14. Insert two fresh “AA” alkaline batteries into thermostat, oriented in the direction shown on the
battery compartment.
15. Replace cover on thermostat by snapping it in place.
16. Turn on power to the system at the main service panel.
To Install Thermostat
Installing and Changing Batteries
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.
1. Move the
Off/Heat
switch into the
Off
position.
2. Move the
Fan Auto/On
switch into
Auto
position.
3. Remove the cover, and install the two “AA” alkaline batteries. 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.
Important Safety Information
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.
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
• Use this thermostat only as described in this manual
Parts Diagram
