Pro1 Technologies
P.O. Box 3377
Springfield, MO 65808-3377
Toll-Free: 888-776-1427
Web: www.pro1iaq.com
Hours of Operation: M-F 9 AM – 6 PM Eastern
Thermostat Application Guide
Description | |
Gas or Oil Heat | Yes |
Electric Furnace | Yes |
Heat Pump (No Aux. or Emergency Heat) | Yes |
Heat Pump (With Aux. or Emergency Heat) | Yes |
Multi-Stage Systems | Yes |
Heat Only Systems | Yes |
Cool Only Systems | Yes |
Millivolt | Yes |
Power Type
A trained, experienced technician must install this product. Carefully read these instructions. You could damage this product or cause a hazardous condition if you fail to follow these instructions.
Wall Locations
The thermostat should be installed approximately 4 to 5 feet above the floor. Select an area with average temperature and good air circulation.
Do not install thermostats in these locations:
Installation Tip
Pick an installation location that is easy for the user to access. The temperature of the location should be representative of the building.
Subbase Installation
Installation Tip: Electrical Hazard
Failure to disconnect the power before beginning to install this product can cause electrical shock or equipment damage.
Mercury Notice
All of our products are mercury-free. However, if the product you are replacing contains mercury, dispose of it properly. Your local waste management authority can give you instructions on recycling and proper disposal.
Mount Thermostat
Align the 4 tabs on the subbase with corresponding slots on the back of the thermostat, then push gently until the thermostat snaps in place.
Note: To ensure a solid fit between the thermostat and the sub-base:
Battery Installation
Battery installation is recommended even if the thermostat is hardwired (C terminal connected). When the thermostat is hardwired and batteries are installed, the thermostat will activate a compressor delay of 5 minutes when it detects a power outage from the hardwired power supply.
Getting to know your thermostat
Important
The low battery indicator is displayed when the AA battery power is low. If the user fails to replace the battery within 21 days, the screen will only show the low battery indicator but maintain all functionality. If the user fails to replace the batteries after an additional 21 days (days 22-42 since the first “low battery display) the setpoints will change to 55˚F (Heating) and 85˚F (Cooling). If the user adjusts the setpoint away from either of these, it will hold for 4 hours and then return to either 55˚F or 85˚F. After day 63 the batteries must be replaced immediately to avoid freezing or overheating because the thermostat will shut the unit off until the batteries are changed.
Caution: Electrical Hazard Failure to disconnect the power before beginning to install this product can cause electrical shock or equipment damage.
Warning: All components of the control system and the thermostat installation must conform to Class II circuits per the NEC Code.
C Terminal
The C (common wire) terminal does not have to be connected when the thermostat is powered by batteries.
Wire Specifications
Use shielded or non-shielded 18-22 gauge thermostat wire.
Note:
In many heat pump systems with no emergency heat relay, a jumper can be installed between E and W2 to turn the thermostat into a single-stage control for Emergency Heat Operation.
Terminal Designations
This thermostat is shipped from the factory to operate a conventional heating and cooling system. This thermostat may also be configured for a heat pump system. See the “heat pump” configuration step on page 17 of this manual to configure the thermostat for heat pump applications.
Terminal | 2 Heat 2 Cool Conventional System | 2 Heat 2 Cool Heat Pump System | 3 Heat 2 Cool Heat Pump System |
RC | Transformer power (cooling) | Transformer power (cooling) | Transformer power (cooling) |
RH | Transformer power (heating) | Transformer power (heating) | Transformer power (heating) |
C | Transformer common | Transformer common | Transformer common |
B | Energized in heating | Heat pump changeover valve energized in heating | Heat pump changeover valve energized in heating |
O | Energized in cooling | Heat pump changeover valve energized in cooling | Heat pump changeover valve energized in cooling |
G | Fan relay | Fan relay | Fan relay |
W/E | First stage of heat | First stage of emergency heat | First stage of emergency heat |
Y | First stage of cool | First stage of heat & cool | First stage of heat & cool |
Y2 | Second stage of cool | Second stage of cool | Second stage of cool & second stage of heat |
W2 | Second stage of heat | Auxiliary heat relay, second stage of heat | Auxiliary heat relay, third stage of heat |
S1/S2 | Remote Sensor | Remote Sensor | Remote Sensor |
Outdoor temperature sensors, Indoor temperature sensors, and Slab sensor wiring diagrams are located in the sensor manuals. See page 18 in tech setup.
Private Label Badge
All of our thermostats use the same universal magnetic badge. Visit the company website to learn more about our free private label program.
Gently slide a screwdriver into the bottom edge of the badge. Gently turn the screwdriver counterclockwise. The badge is held on by a magnet in the well of the battery door. The badge should pry off easily. DO NOT USE FORCE.
In many systems with no emergency heat relay a jumper can be installed between W/E and W2.
This thermostat has a technician setup menu for easy installer configuration. To set up the thermostat for your particular application:
Tech Setup Steps | LCD Will Show | Adjustment Options | Default | |
Filter Change Reminder | This feature will flash a reminder after the elapsed run time to remind the user to change the filter. A setting of “OFF” will disable this feature. | OFF
| You can adjust the filter change reminder from “OFF” to 2000 hours of runtime in 50 hour increments. | OFF |
Room Temperature Calibration | This feature allows the installer to change the calibration of the room temperature display. For example, if the thermostat reads 70˚ and you would like it to read 72˚ then select +2. | 0
CALIbRATE | You can adjust the room temperature display to read up to 4˚above or below the factory calibrated reading. | 0˚F |
Minimum Compressor On Time | This feature allows the installer to select the minimum run time for the compressor. For example, a setting of 4 will force the compressor to run for at least 4 minutes every time the compressor turns on, regardless of the room temperature. | OFF
MIN COMP | You can set the minimum compressor run time to “OFF”, “3”, “4”, or “5” minutes. If 3,4 or 5 is selected, the compressor will run for at least the selected time before turning off. | OFF |
Keypad Lockout Note: The selected keypad lockout functionality must be activated after exiting the tech setup. If you do not perform this procedure, all keys will function freely. To lock
Tech Setup Steps | LCD Will Show | Adjustment Options Default | ||
Compressor Short Cycle Delay | The compressor short cycle delay protects the compressor from “short cycling”. This feature will not allow the compressor to be turned on for 5 minutes after it was last turned off. | ON OF | Selecting “ON” will not allow the compressor to be turned on for 5 minutes after the last time the compressor was on. Select “OF” to remove this delay. | ON |
CO | ||||
COMP DELAY | ||||
Cooling Swing | The swing setting often called “cycle rate”, “differential” or “anticipation” is adjustable. A smaller swing setting will cause more frequent cycles and a larger swing setting will cause fewer cycles. | 0.5 dF
CO COOL SWING | The cooling swing setting is adjustable from 0.2˚ to 2˚. For example: A swing setting of 0.5˚ will turn the cooling on at approximately 0.5˚ above the setpoint and turn the cooling off at approximately 0.5˚ below the setpoint. | 0.5˚ |
Heating Swing | The swing setting often called “cycle rate”, “differential”, or “anticipation” is adjustable. A smaller swing setting will cause more frequent cycles and a larger swing setting will cause fewer cycles. | 0.4 dF
HE HEAT SWING | The heating swing setting is adjustable from 0.2˚ to 2˚. For example: A swing setting of 0.5˚ will turn the heating on at approximately 0.5˚ below the setpoint and turn the heating off at 0.5˚ above the setpoint. | 0.4˚ |
Keypad Lockout | Keypad lockout allows you to configure the thermostat so that some or all of the keys don’t function. | PA
KEY LOCK | PA= partial keypad lockout, which locks all the keys except the or keys. FU= full keypad lockout, which locks out all the keys.
See Keypad Lockout Note | OFF |
Swing Setting Tip
The second stage will turn on at 2x the swing set. The second stage will turn off when 1x the swing is reached. For example, if the swing set is .5 degrees for heating and the thermostat is set at 70ËšF, the first stage will turn on at approximately 69.5. The second stage will turn on at 69ËšF. The second stage will turn off at 69.5ËšF and the first will turn off at 70.5ËšF. If the third stage is used, it will turn on at 68.5ËšF and turn off at approximately 69ËšF.
Tech Setup Steps | LCD Will Show | Adjustment Options | Default | |
Heat Pump | When turned on the thermostat will operate a heat pump. 1. EM. Heat will show as an option in the system switch. 2. Y will be first stage of heat & cool, W/E will be emergency heat relay & W2 will be auxiliary heat relay. | OFF
HEAT PUMP | OFF configures the thermostat for non heat pump systems.
ON configures the thermostat for heat pump systems. | OFF |
System Set | You can configure the system switch for the particular appli- cation. Heat – Off – Cool, Heat – Off, Cool – Off, Heat – Off – Cool – Auto Note: EM. Heat will show if in heat pump mode. | SYSTEM SET | Use the or key until the desired application is flashing. AUTO= Autochangeover | HEAT OFF COOL |
Dual Fuel Auxiliary for Heat Pump Will only appear if Heat Pump setting is turned ON | For Dual Fuel applications (Gas/ Fossil fuel Auxiliary Heat), turn this setting ON to LOCKOUT the Heat Pump (Y) when Auxiliary Heat (W2) is on. If desired – This can also be used with Electric Auxiliary. | A6 GAS AUX | OFF will allow Y(1st stage of Heat) and W2 (Aux Heat) to run together if called for.
ON Will de-energize Y terminal 45 seconds after a call for Auxiliary Heat (W2). | OFF |
Stages of Heat | You can configure the thermostat to operate a 3 stage heat pump system. 2H 2C = 2 heat, 2 cool 3H 2C = 3 heat, 2 cool This feature is shown only if the HEAT PUMP technician setup step is ON. | 2H2C
STAGE | 2 STAGES | |
Cooling Fan Delay | The cooling fan delay setting will delay the fan from coming on in cool mode and keep it running after the compressor shuts off for a short time to save energy in some systems. |
COOL FAN DL | You can set the cooling fan delay to OFF, 15, 30, 60 or 90 seconds. If 15, 30, 60, or 90 is selected the fan will not turn on for that many seconds when there is a call for cool and will run for that many seconds after satisfying a call for cool. | OFF |
IAQ Mode Cycle | This feature will configure the fan to run a selected number of cycles per hour.Note: This mode can be enabled or disabled at anytime during normal operation by selecting IAQ mode with the fan key. | OFF IAQ MODE CYCLE | Select OFF, 1, 2, 3 or 4 with the or keys. This sets the number of cycles per hour that the IAQ fan mode will operate. | OFF |
Tech Setup Steps LCDWill Show | Adjustment Options Default | |||
IAQ Mode Minutes | This allows you to select the minimum number of minutes that the fan will run per IAQ mode cycle. The thermostat will keep track of fan runtime from normal heat and cool operation. If addi- tional fan runtime is needed, the thermostat will run the fan to satisfy the IAQ mode minutes. | 1
IAQ MODE MINUT | Select 1, 5, 10, 15, 20, 30 or 45 minutes. When IAQ fan mode is enabled, it will ensure the fan runs at least the selected number of minutes per IAQ Mode Cycle. This step will not appear if previous step is set to “OFF”. | 1 |
Remote Sensor Operation | You can configure the thermostat for one of three remote sensor applications: 0 No Sensor, 1 Indoor, 2 Outdoor, 3 Floor. | 1 REMOTE MODE | Use the or keys to select one of three options. View the S1/S2 terminal chart on next page for an explanation of these options. | 0 |
Local Temp Sensor | You can disable the sensor on the thermostat. At least one indoor remote sensor must be connected to disable the local sensor. Note: Will only show if remote sensor is set to 1. | ON
LOCAL TEMP | ON enables local sensor. OFF disables the local sensor. | ON |
Number of Indoor Remotes | Enables the use of up to sixteen indoor sensors.
Note: Will only show Remote Sensor is set to 1 and Local Temp Sensor is set to on. | 1 NUMBER OF REMO | You can use 1, 4, 9, or 16 indoor sensors. Refer to the indoor remote sensor Install Manual for detailed connection information. | ON |
Options | Mode | Description | Requires |
1 | Indoor | The local and remote temperatures are averaged. | R251S |
2 | Outdoor | The outdoor temperature is flashed in clock. | R250S |
3 | Floor | The floor temperature is shown in tech. | R250S |
Tech Setup Steps | LCD Will Show | Adjustment Options | Default | |
Heating Temperature Setpoint Limit | This feature allows you to set a maximum heating setpoint limit. The setpoint temperature cannot be raised above this value. | 90 HE | Use the or key to select the maximum heat setpoint. | 90˚F |
Cooling Temperature Setpoint Limit | This feature allows you to set a minimum cooling setpoint limit. The setpoint temperature cannot be lowered below this value. | 44 CO | Use the or key to select the minimum cool setpoint. | 44˚F |
˚F or ˚C | This feature allows you to display temperatures in either Fahrenheit or Celsius. | O 74F | ˚F for Fahrenheit ˚C for Celsius | ˚F |
12 or 24 Hour Clock | You can select either a 12 or 24 hour clock setting. | 12H CLOCK SET | Use the or key to select 12 or 24 hour clock. | 12 |
HOUR CLOCK | ||||
Fan Operation | Select GAS for systems that control the fan during a call for heat. Select ELEC to have the thermostat control the fan during a call for heat. | GAS
FAN SET | GAS or ELEC |
GAS |
Morning Recovery | This feature will start heating early to bring the building temperature to its programmed setpoint by the beginning of the WAKE, OCCUPIED time period. |
MORN RECOV | Use the or key to turn on or off. | ON |
Program Options | You can configure this thermostat to have a 7 day program, a 5+1+1 program or as nonprogrammable. | 5d PROGRAM | Use the or key to select 7d for 7 day, 5d for 5+1+1, or 0d for nonprogrammable. | 5d |
Time Periods | You can configure this thermostat to have 2 or 4 programmable time periods per day. 4 time periods are Wake, Leave, Return & Sleep. 2C time periods are Occupied & Unoccupied. 4C time periods are Occupied 1, Unoccupied 1, Occupied 2, & Unoccupied 2. | 4
TIME PERIOD | Use the or key to select 4, 2c, or 4c time periods per day. | 4 |
Tech Setup Steps | LCD Will Show | Adjustment Options | Default | |
Pre-Occupancy Fan | The pre-occupancy fan settings will energize the fan before the occupied time to provide ventilation prior to scheduled occupancy. This feature only shows if the technician setup step for time periods is set to 2C or 4C. | OFF
PRE OCCUPY FAN | You can select the pre-occupancy fan from OFF, 1, 2, or 3 hours. If 1, 2, or 3 is selected, the fan will turn on that many hours prior to the scheduled occupied time period. | OFF |
Always ON Light | The display light can be configured to stay on all the time or come on when any key is pressed. NOTE: HARDWIRE ONLY Keeping the display light continually “ON” will greatly reduce battery life. | AUTO
dL ANY KEY ON | Use the or key to to turn on or off. OFF configures the display light to come on when the light key or any button is pressed. ON configures the display light to stay on. | AUTO |
Contractor Call Number | Allows you to put your phone number in the display. You can choose ON or OFF. | OFF
PHONE NUM | If selected ON, you will see the input screen after pressing NEXT STEP. Use the or key to select the desired number and the or key to move from one character to another. See note below for operation. | OFF |
Beep | When any key is pressed an audible beep will sound. You can choose ON or OFF. | b | If ON is selected the beep will sound. If OFF is selected there is no sound. | ON |
Contractor Call Number Note
If the contractor call number is selected ON, the phone number entered will show in the display if there has been a continuous call for heating or cooling for 24 hours or if the light button is held down for 3 seconds. To remove the phone number from the display, hold the light button down for 3 seconds.
Tech Setup Steps | LCD Will Show | Adjustment Options | Default | |
An outdoor temperature ABOVE this setting will LOCKOUT the auxilary heat terminal (W2), and ONLY ALLOW the heat pump/ compressor terminals (Y’s) to energize. An outdoor temperature BELOW this setting can perform 2 different ways, depending on the previous Gas Aux/Dual Fuel setting. 1. If Gas Aux/Dual Fuel is set OFF (Default-typical Electric Aux setting) This will allow both heat pump (Y’s) and auxiliary heat (W2) to run together. 2. If Gas Aux/Dual Fuel is set ON (typical Gas Auxilary/Dual Fuel setting) This will LOCKOUT the heat pump (Y’s) and ONLY ALLOW the auxiliary heat (W2) to energize | Use the or key to select NO ( to not use this feature), or 10, 20, 30, 35, 40, 45, or 50 degrees. | |||
Balance Point Temp | ||||
Only shows if Heat Pump is turned ON and Remote Sensor is set to 2. | bAL POINT | NO | ||
Requires Outdoor Sensor | ||||
Balance Point Run Time | Balance point run time will allow the W2 auxiliary terminal to ener- gize even if outdoor temperature is above selected balance point temperature. If enabled, auxiliary will energize for the current cycle after the balance point run time has expired. Note: Only shows if Balance Point is set to an outdoor temperature. |
bAL RUN TIME | 15, 30, 45, 60, 75, 90 minutes NO | NO |
Floor Temperature | The temperature of the floor sensor will be displayed.
Note: Only shows when REOP is set to 3. | 1 76 FLOORTEMP | N/A | NA |
Floor High Limit | This setting allows you to set a maximum floor temperature limit for heat. Heat will be locked out when the floor temperature is above this value. Note: Only shows when REOP is set to 3. | 86
HIGH LIMIT | Use the or keys to select the High Limit for the floor sensor. 35 – 120 degrees. | 86 |
A Note about IAQ Mode
This programmable/selectable mode will operate the fan 1-4 cycles per hour, 1-45 minutes per cycle. Once programmed in tech setup, to enable this mode select “IAQ” with the fan key. Disable this mode by selecting “ON” or “AUTO” with the fan key.
Reminders: Once a reminder has been turned on and set, the elapsed time can be checked by navigating to its tech setup step. The elapsed time will then appear in the text field. It can also be reset at that time by holding down the Clean key button for 3 seconds. Resetting an expired reminder can be done without entering tech setup, by holding down the Clean key button for 3 seconds from the home screen.
Staging Delay Note: This step will not appear if using an outdoor balance point temperature.
Follow the steps below to set the day of the week and current time:
(If using programming)
All our programmable thermostats are shipped with an energy-saving default program. You can customize this default program by following the instructions in the set program schedule section starting on page 24.
Programming
Your thermostat can be programmed to have each day of the week programmed uniquely (7 days), all the weekdays the same with a separate program for Saturday and a separate program for Sunday (5+1+1), or
non-programmable. For the 7-day and 5+1+1 programming modes, there are three-time period options.
Day of the Week | Events | Time | Setpoint Temperature (HEAT) | Setpoint Temperature (COOL) |
Weekday | Wake/OCC1 | 6 AM | 70˚F (21˚C) | 75˚F (24˚C) |
Leave/UNOCC1 | 8 AM | 62˚F (17˚C) | 83˚F (28˚C) | |
Return/OCC2 | 6 PM | 70˚F (21˚C) | 75˚F (24˚C) | |
Sleep/UNOCC2 | 10 PM | 62˚F (17˚C) | 78˚F (26˚C) | |
Saturday | Wake/OCC1 | 6 AM | 70˚F (21˚C) | 75˚F (24˚C) |
Leave/UNOCC1 | 8 AM | 62˚F (17˚C) | 83˚F (28˚C) | |
Return/OCC2 | 6 PM | 70˚F (21˚C) | 75˚F (24˚C) | |
Sleep/UNOCC2 | 10 PM | 62˚F (17˚C) | 78˚F (26˚C) | |
Sunday | Wake/OCC1 | 6 AM | 70˚F (21˚C) | 75˚F (24˚C) |
LeaveUNOCC1 | 8 AM | 62˚F (17˚C) | 83˚F (28˚C) | |
Return/OCC2 | 6 PM | 70˚F (21˚C) | 75˚F (24˚C) | |
Sleep/UNOCC2 | 10 PM | 62˚F (17˚C) | 78˚F (26˚C) |
Select HEAT or COOL with the system key
Note: You have to program heat and cool each separately.
Weekday:
Repeat steps 4 through 6 for the Saturday WAKE/OCC1 time period, LEAVE/UNOCC1 time period, RETURN/OCC2 time period, and for the Saturday SLEEP/UNOCC2 time period.
Saturday:
Repeat steps 4 through 6 for the Sunday WAKEOCC1 time period, LEAVE/UNOCC1 time period, RETURN/OCC2 time period, and for the Sunday SLEEP/UNOCC2 time period.
Select HEAT or COOL with the SYSTEM key
Note: You have to program heat and cool each separately.
To customize your 7-day Program schedule, follow these steps:
(WAKE, LEAVE, RETURN, SLEEP or OCCUPIED 1, UNOCCUPIED1, OCCUPIED 2, UNOCCUPIED 2) Monday: Repeat steps 4 through 7 for the remaining days of the week. A Note About Auto Changeover:
In Auto, you have the ability to switch between Auto Heat or Auto Cool by pressing the system key. This can be done once the current mode has reached its set point. For example: if in Auto Heat, the heat setpoint must be satisfied before the thermostat will allow you to switch to Auto Cool. You can switch out of Auto by holding down the SYSTEM key. To get back into Auto, you must toggle the system key to Auto.
Repeat steps 4 through 7 for the remaining days of the week.
A Note About Auto Changeover:
In Auto, you have the ability to switch between Auto Heat or Auto Cool by pressing the system key. This can be done once the current mode has reached its set point. For example: if in Auto Heat, the heat setpoint must be satisfied before the thermostat will allow you to switch to Auto Cool. You can switch out of Auto by holding down the SYSTEM key. To get back into Auto, you must toggle the system key to Auto.
Day of the Week | Events | Time | Setpoint Temperature (HEAT) | Setpoint Temperature (COOL) |
Weekday | OCCUPIED | 8 AM | 70˚F (21˚C) | 72˚F (22˚C) |
UNOCCUPIED | 6 PM | 64˚F (18˚C) | 80˚F (27˚C) | |
Saturday | OCCUPIED | 8 AM | 70˚F (21˚C) | 72˚F (22˚C) |
UNOCCUPIED | 6 PM | 64˚F (18˚C) | 80˚F (27˚C) | |
Sunday | OCCUPIED | 8 AM | 70˚F (21˚C) | 72˚F (22˚C) |
UNOCCUPIED | 6 PM | 64˚F (18˚C) | 80˚F (27˚C) |
You can use the table on the next page to plan your customized program schedule if using 5+1+1.
Day of the Week | Events | Time | Setpoint Temperature (HEAT) | Setpoint Temperature (COOL) |
Weekday | Wake/OCC1 | |||
Leave/UNOCC1 | ||||
Return/OCC2 | ||||
Sleep/UNOCC2 | ||||
Occupied | ||||
Unoccupied | ||||
Saturday | Wake/OCC1 | |||
Leave/UNOCC1 | ||||
Return/OCC2 | ||||
Sleep/UNOCC2 | ||||
Occupied | ||||
Unoccupied | ||||
Sunday | Wake/OCC1 | |||
LeaveUNOCC1 | ||||
Return/OCC2 | ||||
Sleep/UNOCC2 | ||||
Occupied | ||||
Unoccupied |
Set Program Schedule For Two Time Periods
To customize your 5+1+1 Program schedule, follow these steps:
Weekday: (OCCUPIED, UNOCCUPIED)
Monday:
Repeat steps 4 through 7 for the remaining days of the week. To customize your 7-day program schedule, follow these steps: Repeat steps 4 through 7 for the Saturday OCCUPIED time period and for the Saturday UNOCCUPIED time period.
Saturday: Repeat steps 4 through 7 for the Sunday OCCUPIED time period, and
for the Sunday UNOCCUPIED time period.
Sunday:
A Note About Programmable Fan: The programmable fan feature will run the fan continuously during any time period it is programmed to be on. This is the best way to keep the air circulated and to eliminate hot and cold spots in your building. If using IAQ mode, set fan to IAQ for any time period.
A Note About Programmable Fan:
The programmable fan feature will run the fan continuously during any time period it is programmed to be on. This is the best way to keep the air circulated and to eliminate hot and cold spots in your building. If
using IAQ mode, set fan to IAQ for any time period.
Temporary Hold: The thermostat will display HOLD and Run Schedule on the bottom of the screen when you press the or key. If you do nothing, the temperature will remain at this setpoint temporarily for 4 hours. The program setpoint will then replace the temporary setpoint. Permanent Hold: With a temporary hold set, If you press the Hold key at the bottom of your screen, you will see Hold appear next to the setpoint temperature in the display. The thermostat will now permanently stay at this setpoint and can be adjusted using the or keys. To Return To the Program: Press the Run Schedule key at the bottom of the screen to exit temporary and permanent holds.
Filter Change & Other Reminders
If your installing contractor has configured the thermostat to remind you when the air filter needs to be changed, you will see a reminder in the display when your air filter needs to be changed. the reminder will be shown in the display after your system has run long enough to require an air filter change. Resetting the filter change reminder: When the reminder is displayed, you should change your air filter and reset the reminder by holding down the “Clean” key on the left side of the thermostat for 3 seconds. This thermostat also has other maintenance reminders ( Humidity Pad, UV Lamp, and IAQ Cell ), that are reset with the same procedure.
Download Manual:
Pro1 Technologies T955S Non-Programmable Thermostat Installational Manual
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