Symptom
Remedy
No display
Check for 24 VAC at thermostat; display is blank when 24 VAC is not
present
System fan does not come on
properly
Verify wiring is correct, check Gas/Electric Configuration
(see Setting 7)
All thermostat buttons are inoperative
Verify 24 VAC is present; unit locks out when 24 VAC is not present
No response with first button press
First button press activates backlight only
Thermostat turns on and off too
frequently
Adjust temperature differential (see Configuration Mode Setting 2)
Fan runs continuously
Press FAN (right) button to turn fan off
Status indicator light not on during call Turn status indicator function on (see Configuration Mode Setting 19)
Room temperature is not correct
Calibrate thermostat (see Configuration Mode Setting 15)
If remote sensor is used, check S1 and S2 terminal connections
displays when any button is
pressed
Thermostat has the button lockout function activated (see Lockout
Feature and Configuration Mode Setting 12)
on display instead of room
temperature
Check for a bad connection at S1 and S2 terminals, if used (see
Configuration Mode Setting 17)
Heat or Cool not coming on
Verify wiring is correct, gently pull on each wire to verify there is a good
connection at terminal block
Problem not listed above
Press Reset button once*
* Reset Button Function
:
Time and day are reset, configuration settings are unchanged.
Troubleshooting
19.
Status Indicator Light
(Led 0, 1, 2, 3)
0 = Status indicator never on
1 = Status indicator on with first stage
2 = Status indicator on with second stage
3 = Status indicator on with third stage
Press the
up
or
down
button to select.
Press the
CONFIG
button for 2 seconds to exit configuration.
OFF
18.
Cooling Fan Delay Off Time
(0, 30, 60, 90 seconds)
Select the fan purge time for cooling.
Press the
up
or
down
button to select.
Press the
right
button to advance to the next screen.
LIAF059
SimpleSet
TM
Field Programming
This feature is used for transferring configuration and program schedule from the master to the target thermostat.
All thermostats for a job can be mounted and powered up. Configure and program one thermostat. This will be the
master. The master will be used to copy the program to the rest of the thermostats.
Preparing the master to Send:
1. The master must be powered with 24 VAC.
2. Verify the master thermostat is in
OFF
mode.
3. Press
SYS
(left) button until
OFF
mode displays.
4. Remove cover of the master thermostat by gently pulling near one of the corners at the
top of the thermostat.
Note:
Do not force open. Use a small coin or slotted screwdriver to release tabs if
necessary.
5. Press the
up
and
down
buttons and
CONFIG
switch simultaneously for 5 seconds.
6. The
OUT
screen displays indicating the master thermostat is ready to
transfer data.
Note:
Press the
up
and
down
buttons and
CONFIG
switch simultaneously for 5
seconds to exit from data transfer mode and to return the master to the
OFF
mode.
7. Turn off power to the master and remove it from the wall.
8. Connect the master to the target using the 3 wire connector. Attach one end to the
Master’s FP pins and the other end to the Target’s FP pins.
Note:
Target thermostat must be powered with 24 VAC for field programming to occur
When the connection has been made correctly, the master thermostat will power
up and the target will count from 5 down to 1. It will then display the
LOCK
confirming the data
has been saved in memory.
When all target thermostats have been completed, reinstall the master thermostat.
Press the
up
and
down
buttons and the
CONFIG
switch simultaneously for 5 seconds to exit from the data transfer
mode and to return the master thermostat to the
OFF
mode.
Requires SimpleSet
TM
Transfer Cable (ACC-WIH21)
OFF
FP pins
8.
Dual Fuel System –
Appears only if heat pump is selected.
1 = Heat pump with gas/oil furnace backup
0 = Heat pump with electric backup
Press the
up
or
down
button to select.
Press the
right
button to advance to the next screen.
9.
Outdoor Upper Setpoint
(50°F to 25°F, – –) (10°C to -4.0°C, – –)
Appears only if heat pump is selected.
Note:
See chart on below for more information
For Heat Pumps With Gas/Oil Backup
When the ambient temperature is below the selected temperature, the heat pump will
be locked out and only the furnace will operate.
For Heat Pumps With Electric Backup
When the ambient temperature is above the selected temperature, the heat pump will
operate and electric backup will be locked out.
Press the
up
or
down
button to select temperature.
Press the
right
button to advance to the next screen.
10.
Outdoor Lower Setpoint
(select – – to disable)
Appears only for heat pump with electric backup with outdoor upper setpoint enabled.
Note:
See chart below for more information
When the ambient temperature is below the selected temperature, heat pump is
locked out and only electric heat will operate
Press the
up
or
down
button to select temperature.
Press the
right
button to advance to the next screen.
See “Remote Sensor When Used as Outdoor Sensor” diagram below.
17.
Temperature Sensor
(1-3)
Appears for non-heat pump systems and heat pumps without an
outdoor sensor.
1. Only on-board sensor determines room temperature.
2. Only remote sensor determines room temperature.
3. Average temperature of on-board and remote sensor.
Note:
If there is no remote sensor, option 1 must be selected.
Press the
up
or
down
button to select.
Press the
right
button to advance to the next screen.
16.
Maximum Cycles Allowed Per Hour
(- -, 2-6)
- - = as many as needed, 2-6 = maximum cycles/hour
Press the
up
or
down
button to select.
Press the
right
button to advance to the next screen.
15.
Room Temperature Offset
(+9°F to -9°F) (+4.5°C to -4.5°C)
Adjust to calibrate displayed room temperature to match actual room temperature.
Note:
When not set to 0,
will display
Press the
up
or
down
button to select.
Press the
right
button to advance to the next screen.
12.
Lockout
(0-8°, COOL-HEAT)
Select the number of degrees set temperature can be changed during keypad lockout.
COOL-HEAT
lockout allows adjustment of the set temperatures to the maximum heat
set temperature selected in Step 13 and minimum cool set temperature selected in
Step 14.
Note:
The mode cannot be changed when the thermostat is locked.
Press the
up
or
down
button to select.
Press the
right
button to advance to the next screen.
13.
Maximum Heat Setpoint
(45°F to 90°F) (7°C to 32°C)
Adjust to control the maximum heat set temperature allowed.
Press the
up
or
down
button to select.
Press the
right
button to advance to the next screen.
14.
Minimum Cool Setpoint
(45°F to 90°F) (7°C to 32°C)
Adjust to control the minimum cool set temperature allowed.
Press the
up
or
down
button to select.
Press the
right
button to advance to the next screen.
11. Auxiliary Delay ON
(0-30 minutes)
Set the delay time in minutes for auxiliary heat to be locked out after a call for second
stage. This extra savings feature is used to temporarily lock out auxiliary heat devices,
allowing just heat pump to try to satisfy heat call.
Press the
up
or
down
button to select.
Press the
right
button to advance to the next screen.
Remote Sensor When Used as Outdoor Sensor
Heat Pump with
Electric Backup
Heat pump operation only
Both heat pump and
electric backup
Electric backup only
Upper setpoint
Lower setpoint
°F/C
Outdoor
Temperature
Outdoor
Temperature
Upper setpoint
Heat pump operation only
Gas/oil operation only
°F/C
Heat Pump with
Gas/Oil Backup
Mode of Operation
The
SC4812
is an auto changeover, 3-stage heat, 2-stage cool thermostat. It functions with air conditioning, heat
pumps, gas, oil or electric heat systems. It is dual fuel compatible and an outdoor sensor can be used to monitor the
crossover temperature.
The thermostat activates the heating appliance when the room temperature is below the set heat temperature
(by the differential temperature) and the red indicator light (configurable) on the thermostat will light. The
SC4812
will stop outputting and the red light will turn off when the call for heat has been satisfied. With heat pumps, the
thermostat will not let the compressor come on for 4 minutes after it turns off. This protects your compressor.
When the room temperature is greater than the set cool temperature (by the differential temperature), the cooling
device is activated and the green indicator light (configurable) on the thermostat will turn on. The
SC4812
will
stop outputting and the green light will turn off when the call for cooling is satisfied. The thermostat will not let the
compressor come on for 4 minutes after it turns off. This protects your compressor.
The
SC4812
has four possible operating modes:
OFF
,
Heat
,
Cool
, and
Heat & Cool
mode. In off mode, the
thermostat will not turn on heating or cooling devices. The manual fan can be turned on in all operating modes using
the fan button. In heat mode, the thermostat controls the heating system. In the cool mode, the thermostat controls
the cooling system. In heat & cool mode, the thermostat controls both the heating and cooling systems. The clock
display alternates with the set temperature display for heat & cool mode.
The
SC4812
also has a button lockout feature. This enables the thermostat to be set to the proper mode and
temperature and locked so it cannot be tampered with.
Operating Modes
There are four possible operating modes for the
SC4812
. Off, Cool, Heat, and Cool & Heat modes are accessed by
pressing the
SYS
(left) button.
OFF Mode
• In this mode, the thermostat will not turn on the heating or cooling devices
Note:
The indoor fan can be turned on manually in every operating mode by
pressing the FAN (right) button. The word FAN shows on the display and
the fan icon appears when the fan operates.
OFF
Heat Mode
• In this mode, the thermostat controls the heating system. When the heat outputs,
the flame icon apprears on the display.
Note:
For heat pumps, there is a four minute delay for your compressor to
restart after it has turned off. To bypass the compressor time delay, go to
OFF mode for 5 seconds.
Emergency Heat Mode (Heat pump systems only)
• In emergency heat mode, the heat pump system will be disabled and auxiliary
heat will become the primary source of heat.
Button Functions
UP
Used to increase the time, set temperatures and to adjust configuration settings.
DOWN
Used to decrease the time, set temperatures and to adjust configuration settings.
SYS (left)
Used to change from OFF, HEAT, EMERGENCY HEAT, COOL and AUTO changeover modes
FAN (right)
Used to turn on and off the indoor fan.
UP, SYS and FAN
Held in simultaneously for 10 seconds to lock and unlock the thermostat.
DOWN and SYS
Pressed simultaneously to display outdoor temperature if outdoor remote sensor is connected.
SYS
tem (left)
FAN
(right)
Down
button
Up
button
Cool Mode
• In this mode, the thermostat controls the cooling system. When the cooling
outputs, the snowflake icon apprears on the display.
Note:
There is a four minute delay for your compressor to restart after it has
turned off. To bypass the compressor time delay, go to OFF mode for 5
seconds.
Cool and Heat Mode (Auto Changeover)
• In this mode, the thermostat controls the cooling and heating systems, automatically
changing over from one to the other as needed.
• The timing display alternates with the set temperature every 10 seconds in the cool
and heat mode.
Lockout Feature
The
SC4812
has a button lockout feature so the mode cannot be changed and the
temperature adjustment is limited. Select the appropriate lockout from Configuration
Mode Settings (Step 12) of this guide.
To activate the LOCK feature:
1. Simultaneously press the
SYS
,
FAN
and
UP
buttons for 10 seconds.
2. will display and the lockout function will be enabled.
To deactivate the LOCK feature, repeat steps 1 and 2 above.
Testing the Thermostat
Once the thermostat is configured, it should be thoroughly tested.
CAUTION!
:
Do not energize the air conditioning system when the outdoor temperature is below 50
degrees. It can result in equipment damage or personal injury.
Heat Test
1. Press
SYS
(left) button until heat mode is displayed.
2. Adjust the set temperature so it is 5 degrees above the room temperature.
3. Heat should come on within a few seconds. Red LED may turn on.
4. Adjust the set temperature 2 degrees below the room temperature and the heat should
turn off. There may be a fan delay on your system.
Note:
For heat pumps, there is a four-minute delay to protect your compressor after
it turns off. To bypass the compressor time delay, go to
OFF
mode for 5 seconds.
Cool Test
1. Press
SYS
(left) button until cool mode is displayed.
2. Adjust set temperature so it is 5 degrees below room temperature.
3. A/C should come on within a few seconds. Green LED may turn ON.
4. Adjust the set temperature 2 degrees above the room temperature and the A/C should
turn off. There may be a fan delay on your system.
Note:
T
here is a four-minute time delay to protect the compressor after it turns off.
To bypass the compressor time delay, go to
OFF
mode for 5 seconds.
Fan Test
1. Press
FAN
(right) button. Fan displays. Indoor fan turns ON.
2. Press
FAN
(right) button. Indoor fan turns OFF.
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
FIVE-YEAR LIMITED WARRANTY
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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
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