Listed below are links to installation/operating instructions for 90 Series Digital thermostats.

Model	System	Programming	Instruction Sheet	Operating Manual
1F90-371	Single Stage	5+2/5+1+1Day Programming	37-5748	37-5886
1F92-371	Universal	5+2 Day Programming	37-6422
1F93-380	Commercial	7 Day Programming	37-6066	37-6065
1F94-371	Heat Pump	7Day Programming	37-6186	37-6157
1F95-371	Multi Stage	5+1+1 Day Programming	37-6188	37-6157
1F95-377	Universal	7 Day Programming	37-6158	37-6157
1F95-391	Universal	7 Day Programming	37-6527	37-6528
1F96-344	Single Stage	Non-Programmable	37-6071	37-6072
1F97-371	Single Stage	7 Day Programming	37-5748	37-5886
1F97-391	Single Stage	7 Day Programming	37-6459

Yes, however White-Rodgers recommends setting your humidity setpoint lower than your dehumidifying setpoint. Also set your heating setpoint lower than your cooling setpoint so the thermostat does not detect a conflict. The thermostat does not changeover based on room humidity, it changes over based on room temperature and your heating and cooling setpoints.

The Call Serv UV on the thermostat display signifies that a Call for Service of UV Bulb is needed after a set time of UV bulb operation. This is a reminder to replace your UV light bulb to maintain maximum effectiveness.

The displayed room humidity% is sensed from the thermostat location only.

Multi-stage and Heat Pump 90 Series Premium thermostats are designed to determine the optimum time to activate the second stage. Simply raising the temperature in heating or lowering it in cooling will not always force the thermostat to bring the second stage on quickly. There is a time delay from 0-30 minutes if the system has been reaching your setpoint using the first stage. The time element (0-30 minutes) of the delay varies depending on the performance of the first stage. In Heating, for example, assume for the last 2 hours the thermostat is set on 70° and the room temperature is 70° with the equipment using only the first stage of heat. The thermostat calculates (internally) the performance of the system. Since the equipment is keeping the temperature within 1° of setpoint, the thermostat will delay second stage for a longer time if you manually raise the temperature or if the room temperature quickly changes. Once the second stage comes on, it will come on sooner the next time there is a difference between the setpoint and the room temperature. The net effect of the staging program is when the first stage is capable of making temperature the second stage will delay longer. When the thermostat calculates that first stage cannot make temperature in a reasonable time, the second stage will come on sooner. This is a built in function that automatically optimizes the use of additional stages of heat or cool.

Aux. = Auxiliary Heat or the second stage of heat in the Heat mode. This is energized when the Heat Pump is not keeping up with the thermostat setting. It is normal operation with most pumps for the thermostat to call for auxiliary heat.

Emer. = Emergency Heat. When switched to Emergency the thermostat bypasses the pump and uses the back-up heat. This is useful if the pump is not operating correctly or if the temperature outside is so cold that the pump is not economical to run.

Malf. = Malfunction. Malfunction indicates the heat pump system is sending a signal to the Malfunction Light on the thermostat terminal marked “L”. It does not indicate a malfunction in the thermostat. The manufacturer of the Heat Pump system can determine the likely cause of malfunction indication on the thermostat. In many heat pump systems Emergency and Auxiliary heat are the same source. If you switch the thermostat to Emergency it will bypass the heat pump and bring on the back-up heat. If you leave the thermostat in the Heat mode it will call for Auxiliary when the pump is not keeping up with your setpoint temperature. Some systems will light both Emergency and Auxiliary at the same time if the source of back-up heat is the same heater. Emergency is energized on a call for heat in the Emergency heat mode.

For Single Stage models there are 3 possibilities to consider (excluding tampering):

Loss of power from the system and back-up batteries not functioning.
You may want to see if the thermostat maintains the display when removed from the subbase to
determine if the batteries are functioning on power loss. You may want to check the fuses or breakers, the on/off switch on the furnace and the door to the blower compartment. If the blower compartment door is loose there may be a switch inside the door that disconnects power to your system. Also consult the furnace manufacturer to see if they have any other ideas on what could drop out the system power.

Static electricity or a voltage spike from the heating equipment might be resetting the thermostat. Static electricity can be eliminated by touching something before touching the thermostat to dissipate the static charge. A voltage spike from the equipment can be eliminated using an isolation relay as described in this instruction sheet 0037-5426.

You can also check the wire routing to verify the thermostat or remote wires are not running parallel to high voltage lines with high inductive loads that could (in extreme cases) create a voltage spike at the thermostat.

For Multi-Stage or Heat Pump staging models there are other possibilities to consider and they are as follows:

Loss of power from the system. You may want to check the fuses or breakers, the on/off switch on the furnace and the door to the blower compartment. If the blower compartment door is loose there may be a switch inside the door that disconnects power to your system. Also consult the furnace manufacturer to see if they have any other ideas on what could drop out the system power.

Static electricity. Static electricity can be eliminated by touching something before touching the thermostat to dissipate the static charge.

A voltage spike from the heating equipment might be resetting the thermostat and if you have a system that generates a high voltage spark (D.S.I.) you may want to contact the Equipment manufacturer for information on how to eliminate that condition.

You can check the wire routing to verify the thermostat or remote wires are not running parallel to high voltage lines with high inductive loads that could (in extreme cases) create a voltage spike at the thermostat.

A cooling example as the room temperature falls you will eventually reach the setpoint temperature. The System will continue to run until it reaches the low side of the temperature setting. As an example: If set to 78° with the room temperature falling the thermostat will continue to call for cool as the temperature decreases in the following manner. 78.9°, 78.8°, 78.7°, 78.6°, 78.5°, 78.4°, 78.3°, 78.2°. At approximately 78.2° the thermostat will quit calling for cool. This is why it is not unusual for the room temperature and set temperature to read the same but the system continues to run. The amount of time it takes for the system to shut off is dependent on system sizing, thermostat location, etc. Note: The thermostat only displays whole numbers. Internally the thermostat calculates decimals. In heating as the room temperature increases the system will continue to run until the thermostat reaches the high side of the temperature setpoint.

On the 1F92-371, 1F93-380, 1F94-371, 1F95-371 and 1F95-377 the E2/P switch controls how the E2/P terminal of the thermostat will be energized. When the switch is in the E2 position (down), the E2/P terminal will be energized only when in emergency heat. When the switch is in the P position (up), the E2/P terminal will always be energized except when in emergency heat. Consult the equipment manufacturer or a qualified heating/cooling service person if your system requires an E2 or P terminal output before setting this switch. If your system has no connection to E2/P, no change in the switch setting is required.

On the 1F95-391 the E2/P Switch is located on the back of the thermostat body. This switch controls how the DHM terminal will be energized.
1. In the P position (up) the DHM terminal will be energized on a call for dehumidification.
2. In the E2 position (down) the DHM terminal will always be energized except on a call for dehumidification. The switch must be in the E2 position on some electronically controlled variable speed blower systems.

Your thermostat from the factory is configured to operate Heat, Off, Cool, or Auto. Refer to your Installation Instructions Installer Table if you wish to set it for heat only, cool only, or reset it to Heat, Cool and Auto.

If the heating system is operating and there is a demand for humidity, then the humidifier will operate. If the demand for humidity is not satisfied for ten consecutive heat cycle operations, the display will show the word HUMD for one second and the word MX for one second signaling maximum possible humidity is reached.

This feature displays the words CHCK PAD (check humidifier) after a set time of humidifier operation. This is a reminder to maintain or clean your humidifier. When CHCK PAD is displayed, you can clear it by pressing the SERVICE button.

The thermostat has a feature called Automatic Changeover that allows it to switch from heat to cool or cool to heat automatically. It will also indicate if you program or adjust the temperatures so there is a conflict between heat and cool (heating temp higher than the cooling or cooling lower that the heating temperature). The thermostat will flash to indicate the conflict in the heat and cool temperatures. Remember to program the cooling temperatures higher than the heating temperatures to avoid a conflict.

90 Series Premium models will retain the last program entered indefinitely without power or batteries. However you will have to reset your clock and day settings.

Any time you wish to turn your system off, simply press the SYSTEM button until the display shows OFF. This will not affect your thermostat's programming in any way. To turn the system back on, press the SYSTEM button until HEAT or COOL is displayed. The system will begin operating according to the current thermostat program or temperature setting.

The most common reasons why a thermostat does not follow your program are:

1. AM or PM set incorrectly in program
2. AM or PM set incorrectly on clock
3. Voltage spike or static discharge

Check current clock and program settings including the AM or PM designations for each time period. If a voltage spike or static discharge occurs use the RESET operation by pressing PROGRAM RUN once and release, and then press FAN, TIME BACK and TEMPERATURE DOWN arrow at the same time and hold until your display goes blank then release. Models with EMR (Energy Management Recovery) start early to make the temperature they are programmed for by the time specified in the program. See the Configuration Menu of your thermostat Operating Instructions for information on how to disable EMR if you do not want the thermostat to start early.

The display light in the 1F90 series is not a replaceable item. On single stage thermostats (1-heat/1-cool) the light uses battery power. If the light is not coming on, replace the batteries and/or clean the battery contacts inside the back of the thermostat. Use a pencil eraser to gently polish each of the battery contacts. Do not bend them up and down or they may break. When complete they should be as shiny as a mirror. This will assure proper battery back-up and allow the backlight to work correctly. The multi-stage and heat pump models obtain power for the light from the 24 volt transformer so if anything in the system interrupts power to the thermostat the light will not operate.

There is no need to select a time to stop a programming period. Starting a new programming period will stop the previous program period.

Normally the blower will turn off a within a few minutes after the call for heat or cool. The blower running after the system shuts off may indicate (1) the thermostat is set to FAN ON, (2) the fan has been programmed to run at that time period or (3) something has damaged the thermostat or equipment. If the thermostat display indicates FAN ON, press the fan switch once to set it to FAN AUTO, meaning the fan will cycle only with the equipment. If the display indicates PRG FAN (Program Fan), sometime during programming, the FAN switch was pushed. To remove PRG FAN (Program Fan), check all of the programmed times and temperatures. When you encounter PRG FAN, press the FAN switch to remove it from that time period in the program. As a final test, switch the thermostat to OFF. Verify that Fan On or Fan Auto is not displayed. If the fan continues to run, you may want to contact your heating and cooling service person for assistance.

Adjustable Heating and Cooling Cycle Times (also called Anticipation ).

90 Series Premium thermostats have a feature that allows you to increase or decrease the cycle times in
heating and cooling. This is useful if you think your cycle times are too long or too short. 90 Series
Premiums are adjusted by going into the Installer/Configuration Menu; see your Installation/ Operating
Instructions for adjustment.

The higher the number you select, the longer the cycle. The lower the number you select, the shorter the cycle. The range of adjustment for HEATING is from 2 to 40. The factory Preset is 5. The range of adjustment for COOLING is from 9 to 40. The factory Preset is 14. The cooling will not go below 9 because compressors require a longer cycle.

The Heat-Pump models also have an AUXILIARY CYCLE rate adjustment that can be adjusted in the Installation Instructions Installer table. The adjustment range for Auxiliary (heat pump only) is from 1 to 40. The factory default for models 1F92-371, 1F93-380, 1F94-371 and 1F95-377 is (6). The factory default for model 1F95-391 is (8).

The chart below shows how this adjustment range affects thermostat performance.

† These numbers are approximate and represent operation with a typical system. Actual temperature differentials and run times will vary based on your building and equipment, as well as outdoor temperature conditions.

Your thermostat is designed to cycle on and off in heating or cooling, keeping your building in an accurate temperature range. This maximizes your comfort by keeping the room temperature very close to the temperature you set. It is not unusual for your thermostat to be set for 70 and cycle on and off at 70 keeping you right on target.

A note on older style thermostats; Anticipation on older style thermostats (mercury bulb or mechanical) used the current draw of the equipment to set the anticipation. Some heating and cooling equipment manufacturers still refer to setting the anticipator to the current draw of the equipment. This does not apply to your new digital thermostat. Right from the box your new thermostat will do an excellent job of keeping your building at an accurate temperature. The information above allows you to customize the performance of your digital thermostat to your requirements.

To bypass the program and operate the thermostat manually (like a mechanical model) press SYSTEM button to select Heat or Cool (whichever your prefer) and press HOLD. Use the Temp Up or Temp Down buttons to set the thermostat on the temperature you want. The temperature setting you choose will be held until you manually change it using the Temp Up or Temp Down buttons. The thermostat will remain in the HOLD mode when you change temperature and maintain whatever temperature you set. If you decide to return to the program, press PROGRAM RUN to cancel the hold feature.

Battery (Flashing) on Display Battery flashing or blinking on the digital display indicates low batteries. If the batteries have recently been changed and the thermostat continues to indicate low batteries, use a pencil eraser to polish each of the battery contacts inside the back of the thermostat. Do not bend them up and down when polishing or you might break them. When complete, they should all be as shiny as a mirror. This will assure proper battery back-up, allow the backlight to work correctly and remove the flashing battery symbol from the screen.

Battery (Solid) on Display The battery symbol (not blinking) indicates a loss of power (24 volts) from the heating and cooling equipment to the thermostat. Normally the heating and cooling do not operate when the battery indicator is on. If the battery indicator is on, check the fuses or breakers, make sure the furnace is switched on, and verify the blower compartment door is closed properly. The battery display is designed to indicate the thermostat is running on batteries, so replacing batteries has no effect on the indicator. Note: Some heat only systems (zoned systems) disconnect power from the thermostat during a normal heating cycle and display the battery symbol. Millivolt heating systems always indicate battery because they do not supply 24 volts to the thermostat.

The temperature display on a digital thermostat will normally read very accurately. If however, the heating and/or cooling system is oversized or undersized or the location of the thermostat is not ideal it can cause the temperature display for the room to read high or low. The 90 Series allows an adjustment in the "Installer Table/Configuration Menu" section. See installation instructions/Operating Manual to adjust the temperature display.

Consult the installation instructions "Configuration Menu" section.

No Heat: With the system set to heat, when the setpoint temperature is raised or lowered past the room temperature, the thermostat will make a soft click sound within about 5 seconds. Usually the sound indicates correct thermostat operation. If the heat does not come on after raising the temperature and hearing the click, check the fuses or breakers, make sure the furnace is switched on, and verify the blower compartment door is closed properly. If no click sound is heard try resetting the thermostat as described below.

No Cool: Air conditioning systems usually include an outdoor compressor and an indoor blower. With the thermostat set to COOL and the temperature lowered below the room temperature by a couple of degrees, there can be up to a five minute delay before the thermostat activates the compressor and an indoor blower. If both the compressor and an indoor blower are running and the air is not cool it may indicate loss of refrigerant in the compressor. If the blower or compressor do not come on or do not shut off try the reset operation below.

Reset Operation: 90 Series Premium thermostats have a sequence of buttons (press and release PROGRAM RUN, then momentarily press FAN, TIME BACK, and the Temp Down arrow at the same time) to reset it to the factory defaults. If a no heat or no cool condition persists after resetting the thermostat you may wish to contact your heating and cooling person for assistance. If a Multi-stage or Heat-Pump model thermostat does not respond when keys are pressed, or the thermostat is not operating properly, use the reset button located on the back of the thermostat body. Thermostat programming and configuration will not be affected by pressing the reset button but the clock will need to be reset.