Installation, Operation & Application Guide
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products – plus wiring diagrams, troubleshooting tips and more,
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SC1901L/SC1901VL
Non-Programmable Electronic Thermostat
• Controls Single Stage
Cooling Systems
• Compatible with A/C
Systems
• 30-Minute Power Loss
Memory Retention
• For use with 24 VAC
Systems
Important Safety Information
• 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; 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; only use a damp cloth with a mild
soap to wipe outside of thermostat cover
Specifications
Input:
•
Voltage:
18-30 VAC
Output:
•
Maximum:
1 amp per terminal (2 amp total for all terminals)
Temperature Ranges:
•
Temperature control range:
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)
Accuracy:
± 1°F (± 0.5°C)
•
System configurations:
Single-stage cool
•
Terminations:
S1, S2, G, Y, C, R
Note:
This thermostat is designed for: Single stage cooling systems. It will retain your setpoint
temperature in memory for up to 30 minutes during a power outage.
Package Contents/Tools Required
Package includes:
SimpleComfort
®
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
General Description
• The SimpleComfort
®
thermostat is a
hardwired, digital, mercury-free, non-programmable,
electronic thermostat
• Compatible with single-stage
cooling systems
•
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
• 30 minute power loss memory retention
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 cooling system. Move the
Mode
switch to
OFF
.
2. To remove cover, insert and twist a coin or screwdriver in the slots on the sides of the thermostat.
3. Move the
Fan
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. Replace cover on thermostat by snapping it in place.
14. Turn on power to the system at the main service panel.
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 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.
Replacing Wiring Labels
Replace the old labels with the enclosed new labels:
Old
New
Type
F, G
G
Fan control relay
Y, Y6
Y
Cooling control
C
Transformer, common side
M, 4, RH, RS, R
R
Transformer, hot side
C
Y or C
If the C terminal is the cooling control, connect to Y terminal. If it
is the common side of the transformer, connect to C terminal
N/A
S1, S2
Optional remote sensor
Operation
Setting the Room Temperature (Setpoint Temperature)
Step 1:
Press the
up
or
down
button; the current temperature sepoint displays.
Step 2:
Press the
up
or
down
button until the desired temperature sepoint 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 on your system. If you notice your system turning on and off too frequently, increase the
temperature differential.
Step 1:
Remove cover and press the
Reset
button once.
Step 2:
For the first 10 seconds of operation, the temperature differential is displayed.
Press the
up
or
down
button to select desired setting.
Starting the Thermostat
Step 1:
Move the
Fan
switch into the
Auto
position.
Step 2:
Move the
Mode
switch to
Cool
.
