Setting the Setpoint Temperature
1. Place
Off/Heat
switch in the
Heat
position.
2. Press the
down
or
up
button a single time to see the
current temperature
setting.
3. Press the
down
or
up
button until the
desired temperature
setpoint displays.
4. The new temperature setpoint is automatically saved in memory. After 5 seconds, the display
returns to showing the current room temperature.
Setting the Temperature Differential
The default temperature differential is 1°. When your room temperature varies by 1°F, the thermostat
turns on your system. If you notice your system turning on and off too frequently, increase the
temperature differential.
1. Reset the thermostat by removing batteries for 10 seconds and then reinstall them.
2. For the first 10 seconds of operation, the temperature differential is displayed.
3. Press the
down
or
up
button to select desired setting.
Starting the Thermostat
1. Move the
Fan Auto/On
switch into the
Auto
position.
2. Move the
Off/Heat
switch into the
Heat
position.
A Quick Test
Do not short jumper across terminals on the gas valve or at the system control to test installation.
Action:
Set the
Off/Heat
switch to
Heat
; press the
up
button until the set temperature is 3°F above the
room temperature.
Result:
Heating system and fan should turn on; there may be a time delay depending on your
system.
Action:
Press the
down
button until the set temperature is below the room temperature.
Result:
The heating system should turn off; there may be a fan delay.
Action:
Set the
Fan Auto/On
switch to
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 the above
test was unsuccessful
, double check that the wires are securely connected and are
connected to the proper terminals. Consult the troubleshooting section below.
Troubleshooting
Symptom
Remedy
The system is not turning on
Check batteries; display is blank when batteries are not present or
are dead.
LCD is blank, or displaying
LO BAT
Replace batteries, or make sure the existing ones are properly
installed.
Thermostat is not properly
controlling the fan
Check that the GAS ELEC jumper position matches your system
(gas or electric).
Thermostat turns on and off
too frequently
Adjust temperature differential
(see “Setting the Temperature Differential).
SC1800L/VL Wiring Diagrams
Heating Only
3-Wire,
Single Transformer
2-Wire,
Single Transformer or Millivolt
Zone Valve/Damper Motor System
3-Wire, Zone Valve/Damper Motor System
2-Wire, Zone Valve/Damper Motor System
Note:
Differential temperature may need to be increased for zone/damper
systems.
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.
LIAF007
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
