Aprilaire 8539 Digital Thermostat OPERATING INSTRUCTIONS

Aprilaire 8539 Digital Thermostat

Your new digital thermostat has been designed to provide accurate control and display of room temperature. In addition, it also will display all relevant information pertaining to your system. The clearly marked buttons and informative display make it extremely easy to understand and simple to use.
Please take a few moments to read the brief instructions and familiarize yourself with the various functions in order to obtain maximum benefit from this truly unique electronic control.

GENERAL INFORMATION

The thermostat normally displays room temperature, mode of operation and whether cooling or heating is currently on. The two buttons on the front of the unit allow complete control of the equipment.
Raising or lowering the setpoint is as simple as pushing a button. In addition, you may choose to display the temperature in °F or °C.
The thermostat also allows you to select continuous fan operation (useful when using an air cleaner) or have the fan come on with the equipment.

The model 8539 is a single-setpoint heat/cool thermostat. It features a narrow, fixed deadband between internal heat and cool setpoints.

USER CONTROLS

COOLER
To lower the temperature in the zone, press and hold the ✞ button until the desired temperature is displayed, then release.
WARMER
To raise the temperature in the zone, press, and hold the ✟ button until the desired temperature is displayed, then release.
The number that is displayed when the button is released is the new setpoint or control temperature for the zone. The display will return to the normal room temperature display after a few seconds.
CELSIUS/FAHRENHEIT
Simultaneously press ✞ and ✟ to switch between Celsius and Fahrenheit temperature display FAN $ The fan will come on automatically when the system is operating, but there is no indication of this on the display. To select continuous fan operation, press the FAN button and the display will show $. This is recommended for electronic air cleaners or continuous ventilation requirements.
NOTE: For fan coil applications in which the O and B output terminals control valve position, DO NOT use a continuous fan.
REMOTE SENSOR (OPTION)
RS1 – RS2 – RS+V
The thermostat is designed to accept the electronic remote sensor, which will allow you to locate your thermostat in an area away from view. Indoor and outdoor sensors are available separately.

HEAT & COOL INDICATION ON DISPLAY
When the equipment is off, both flame and snowflake are on steadily. When the thermostat is calling for heat, the flame flickers and the snowflake goes off. When cooling, the snowflake flickers and the flame goes off.
LIMITED OVERRIDE
When the keyboard is locked (DIP switch #2 ON), the user may override the temperature setpoint for 1 hour by pressing either the ✞ or ✟ button. The range of temperature override is ±6°F or ±3°C from the programmed daytime setpoint.

POWER FAILURES

Your thermostat employs the latest developments in solid-state electronic technology.
One of the unique features of your thermostat is that no battery is required to maintain your selected setpoints in the event of a power loss as the memory is unaffected by power failures of any duration.
When power is restored, the thermostat will continue operating as if the power had never been off.
TEMPERATURE ACCURACY
Full temperature accuracy will be realized only after the thermostat has been installed and powered for at least one hour.

ELECTRONIC PROGRAMMABLE THERMOSTAT TWO-YEAR LIMITED WARRANTY

Your Research Products Corporation Aprilaire® Thermostat unit is expressly warranted for two (2) years from the date of installation to be free from defects.
Research Products Corporation’s exclusive obligation under this warranty shall be to supply, without charge, a replacement for any thermostat which is found to be defective within a two (2) year period and which is returned no later than thirty (30) days after said two (2) year period by you to either your original supplier or to Research Products Corporation, Madison, Wisconsin, 53701, together with the model number, manufacturing code number and installation date of the thermostat. THIS WARRANTY SHALL NOT OBLIGATE RESEARCH PRODUCTS CORPORATION FOR ANY LABOR COSTS AND SHALL NOT APPLY TO DEFECTS IN WORKMANSHIP OR MATERIALS FURNISHED BY YOUR INSTALLER AS CONTRASTED TO DEFECTS IN THE THERMOSTAT ITSELF. IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL BE LIMITED IN DURATION TO THE AFORESAID TWO (2) YEAR PERIOD. RESEARCH PRODUCTS CORPORATION’S LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES, OTHER THAN DAMAGES FOR PERSONAL INJURIES, RESULTING FROM ANY BREACH OF THE AFORESAID IMPLIED WARRANTIES OR THE ABOVE-LIMITED WARRANTY IS EXPRESSLY EXCLUDED. THIS LIMITED WARRANTY IS VOID IF DEFECT(S) RESULT FROM FAILURE TO HAVE THIS UNIT INSTALLED BY A QUALIFIED HEATING AND  AIR CONDITIONING CONTRACTOR. IF THE LIMITED WARRANTY IS VOID DUE TO THE FAILURE TO USE A QUALIFIED CONTRACTOR, ALL DISCLAIMERS IMPLIED WARRANTIES SHALL BE EFFECTIVE UPON INSTALLATION.
Some states do not allow limitations on how long an implied warranty
lasts or the exclusion or limitation of incidental or consequential damages so the above exclusion or limitations may not apply to you.
This warranty gives you specific legal rights and you may also have other rights which vary from state to state.
This equipment if installed in strict accordance with the manufacturer’s instructions, complies with the limits for a Class B computing device pursuant to Subpart J of Part 15 of FCC rules.

INSTALLATION INSTRUCTIONS

LOCATION
To ensure proper operation, the thermostat should be mounted on an inside wall in a frequently occupied area of the building. In addition, its position must be at least 18″ (46cm) from any outside wall, and approximately 5′ (1.5m) above the floor in a location with freely circulating air of an average temperature.
BE SURE TO AVOID THE FOLLOWING LOCATIONS:

• behind doors or in corners where freely circulating air is unavailable
• where direct sunlight or radiant heat from appliances might affect control operation
• on an outside wall
• adjacent to, or in line with, conditioned air discharge grilles, stairwells, or outside doors
• where its operation may be affected by steam or water pipes or warm air stacks in an adjacent partition space, or by an unheated/uncooled area behind the thermostat
• where its operation will be affected by the supply air of an adjacent unit
• near sources of electrical interference such as arcing relay contacts

THERMOSTAT INSTALLATION

1. Insert a flat blade screwdriver or coin 1/8″ into the slot located in the bottom center of the thermostat case and twist 1/4 turn. When you feel or hear a click, grasp the case from the bottom two corners and separate from the subbase as shown in the diagram at the right. Some models require more force than others when separating due to the number of terminals on the subbase.
2. Swing the thermostat out from the bottom.
3. Lift the thermostat up and off the subbase.
4. Place the rectangular opening in the subbase over the equipment control wires protruding from the wall and, using the subbase as a template, mark the location of the two mounting holes (exact vertical mounting is necessary only for appearance).
5. Use the supplied anchors and screws for mounting on drywall or plaster; drill two 3/16″ (5mm) diameter holes at the marked locations; use a hammer to tap the nylon anchors in flush to the wall surface and fasten the subbase using the supplied screws. (Do not overtighten!)
6. Connect the wires from your system to the thermostat terminals as shown in the wiring diagrams. Carefully dress the wires so that any excess is pushed back into the wall cavity or junction box. Ensure that the wires are flush to the plastic subbase. The access hole should be sealed or stuffed to prevent drafts from affecting the thermostat.
7. Before the thermostat is reinstalled on the subbase, install the optional indoor remote sensor (model 8002), if used. Refer to the installation instructions supplied with the model 8002.

REPLACING THE THERMOSTAT ON THE SUB BASE

1. Position the thermostat on the hinged tabs located at the top of the subbase.
2. Gently swing the thermostat down and press on the bottom center edge until it snaps in place.

SLIDE SWITCH SETTINGS

SPECIFICATIONS

• Rated Voltage 20-30 VAC, 24 nominal
• Rated A.C. 0.05 Amps to 0.75 Amps continuous
• Current per output with surges to 3 Amps Max.
• Rated D.C. 0 Amps to 0.75 Amps continuous
• Current per output with surges to 3 Amps Max.
• Control Heating: 38° to 88°F in 1° Steps
• Range 5° to 30°C in 1° Steps
• Cooling: 60° to 108°F in 1° Steps 16° to 40°C in 1° Steps Thermostat
• Measurement 28° to 124°F or 0° to 48°C
• Range
• O.D.T. Displayed
• Range -50° to 124°F or -48° to 48°C
• Control ± .5°C at 20°C
• Accuracy ± 1°F at 68°F
• Minimum (between heating and
• Deadband cooling) 2°F or 1°C
  NOTE: This thermostat contains electronic circuitry replacing the conventional mechanical anticipator.

Note 1: If the jumper is removed, a dedicated transformer is required at the R terminal to power the loads.
Note 2: This thermostat may be used with 24 Volt DC. The negative side of the DC supply must be wired to the 24V (c) terminal.

OUTPUT TERMINAL FUNCTIONS

• W1. . . . . . . . Energizes on a call for first stage heat
• Y1 . . . . . . . . Energizes on a call for first stage cool
• G . . . . . . . . . Energizes with a call for heating or cooling or selected by the FAN button
• R . . . . . . . . . Independent switching voltage
• 24 V. . . . . . . 24 VAC
• 24 V(c). . . . . 24 VAC (common)
• O . . . . . . . . . Energizes the reversing valve continuously in cooling mode
• B . . . . . . . . . Energizes the reversing valve continuously in heating and off modes
• RS2 . . . . . . .For the outdoor temperature sensor
• RS1 and/or indoor remote sensor options.
• RS+V Refer to the instructions included with the sensors.

P.O. BOX 1467 MADISON, WI 53701-1467
CALL 608/257-8801
FAX 608/257-4357
Products For Better Indoor Air Quality

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Aprilaire 8539 Digital Thermostat OPERATING INSTRUCTIONS

Aprilaire 8539 Digital Thermostat OPERATING INSTRUCTIONS