SAFETY INSTRUCTIONS Read this Installation Manual before beginning installation of the Aprilaire Research Products Corporation at (800) 334-6011. WARNING 1. 120 Volts may cause serious injury from electrical shock. Disconnect electrical power to the HVAC equipment before starting installation. This thermostat is not a 120-volt (line voltage) device.
MODEL 8570 SPECIFICATIONS Electrical Thermostat Voltage: Total Load Current: Single Output Load Current: Solid State Output Residual Current: Voltage Drop at Solid State Outputs: Thermal Operating Range: Display Accuracy: Control Accuracy: Control Range Heat: Control Range Cool: Heat/Cool Deadband: 1st Stage Differential:...
WIRE REQUIREMENTS Figure 1 and the table show the number of wires that must be available at the thermostat in stand-alone thermostat systems (i.e. not as part of an Aprilaire ® Model 6504 Intelligent Zone System). Figure 1 shows optional connections to both an outdoor temperature sensor and an Aprilaire Automatic Humidifier Control (AHC), but only one or the other can be used.
(1) SELECT A MOUNTING LOCATION If installing the thermostat alone… • Mount on an interior wall, in a frequently occupied space. • Keep the thermostat 18" from an outside wall. • Mount the thermostat approximately 5 feet above the floor. Height requirements are different for compliance with the Americans with Disabilities Act (ADA) –...
(2) OPEN THE THERMOSTAT Use your hands to pull the thermostat face off of the base. Separate one side at a time. There are latches on either side of the thermostat. If needed, the thermostat can be pried from the base by inserting a flat-head screwdriver (see Figure 3). CAUTION Figure 3 Loss of internal programs...
(3) MOUNT THE THERMOSTAT BASE TO THE WALL 1. Place the wire opening in the base over the wire entry hole in the wall. Level the base (for appearance only) and mark the screw locations. See Figure 4. 2. Use the supplied screws and wall anchors to mount the thermostat to the wall.
(4) SET THE CONFIGURATION DIP SWITCHES ON THE THERMOSTAT CIRCUIT BOARD There are four dip switches located on the back of the thermostat (on the circuit board) that must be set to properly configure the thermostat for operation with the equipment it is to control.
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6504 or AHC – This switch is used to configure the thermostat installation as part of a Model 6504 Intelligent Zone System. • Set to 6504 only if installing as part of a Model 6504 Intelligent Zone System. • Set to AHC if the thermostat is to be wired to the HVAC equipment or standard zone system.
(5) WIRE THE THERMOSTAT TO THE HVAC EQUIPMENT WARNING 120 volts may cause serious injury from electrical shock. Disconnect electrical power to the furnace and air conditioner before starting installation. This thermostat is not a 120 volt (line voltage) device. 1.
(6) OPTIONAL – INSTALL AN APRILAIRE MODEL 8052 OUTDOOR TEMPERATURE SENSOR Note: If an AHC is to be installed, do not wire an outdoor temperature sensor– see Step 7. The AHC uses its own outdoor temperature sensor, which can be read by the thermostat.
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2. Run a 2-wire cable from the sensor to the thermostat. CAUTION Do not run the wire along side line voltage (120 VAC) or higher lines as this can cause erratic readings. 3. Take a resistance measurement before connecting to the ODT and CIR GND terminals to verify the sensor is properly installed.
(7) OPTIONAL – INSTALL AN AUTOMATIC HUMIDIFIER CONTROL (AHC) Note: The AHC uses its own outdoor temperature sensor, which is read by the thermostat. If an AHC is to be installed, do not wire an outdoor temperature sensor to the ODT terminal of the thermostat.
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Figure 8 AUTOMATIC MODE B2203201 Rev. B AHC must be powered by a continuous supply – do not wire to furnace accessory terminals. - 20 -...
(8) OPTIONAL – INSTALL AN APRILAIRE MODEL 8051 INDOOR FLUSH MOUNT TEMPERATURE SENSOR 1. Mount the indoor temperature sensor. • Locate the sensor as you would locate a thermostat. • Maximum wire length from sensor to thermostat is 300 feet.
(9) THERMOSTAT STARTUP – STAND ALONE APPLICATIONS MESSAGE CENTER OUTDOOR TEMPERATURE ROOM TEMPERATURE MULTI-FUNCTION BUTTONS - 23 - EQUIPMENT STATUS SETPOINTS UP/DOWN BUTTONS...
1. PLACE THE THERMOSTAT ON THE BASE. 2. TURN ON POWER TO THE HVAC SYSTEM. • The display will show the Aprilaire screen for approximately 5 seconds (up to 10 seconds if installed as part of a Model 6504 Intelligent Zone System).
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Miswiring – Check wire colors to verify I- at AHC is connected to I- at thermostat and I+ is connected to I+. AHC power source – When wired to the Model 8570 thermostat, the AHC must be wired to a continuously ON power source. Use voltmeter to verify presence of 24VAC (nominal) at AHC.
6. CHECK HEATING OPERATION Notes: 1. To avoid the minimum off times during system checkout, always start and end the check out procedure in the OFF mode. 2. Do not operate heat pumps in the heating mode at high outdoor temperatures for extended periods of time. •...
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TROUBLESHOOTING – HEATING OPERATION Symptom Thermostat does not call for heat Heating does not come on at all Auxiliary Heat does not come on Fan stays on after heat call Fan comes on before heat starts, or Fan does not come on with heat Cooling comes on instead of heat Takes longer than 4 minutes for auxiliary heat to come on after compressor heat.
7. CHECK COOLING OPERATION Notes: 1. To avoid the minimum off times during system checkout, always start the check out procedure in the OFF mode. 2. Do not operate air conditioning at low outdoor temperatures. Refer to equipment manufacturer’s recommendations for safe operating temperatures. •...
8. CHECK EMERGENCY HEAT OPERATION (Heat Pumps Only) Notes: 1. To avoid the minimum off times during system checkout, always start the check out procedure in the OFF mode. • Set the thermostat to the OFF mode: • Set the thermostat to the EMERGENCY HEAT (EMERG) mode: –...
(10) CUSTOMIZE THE APPLICATION SETTINGS 1. DIFFERENTIAL Determines the temperature above/below the temperature setting at which the heating or cooling equipment will turn on. For example, a heat temperature setting of 70°F with a differential of 2° will result in the equipment turning on and off to maintain the temperature between 68°F and 70°F.
2. OFFSET All thermostats are factory calibrated to be accurate to within ±1° of true temperature. An offset is available to allow for agreement with field temperature measuring instruments. The value set will be added to the temperature sensed by the thermostat.
4. BALANCE POINTS (HEAT PUMPS ONLY) This feature is only available when the thermostat has been configured to operate heat pumps (see SET THE CONFIGURATION DIP SWITCHES on page 6) and only when an outdoor temperature is available to the thermostat. Outdoor temperature can come from an AHC or from an outdoor temperature sensor.
AHC (if an AHC has not been installed the Aprilaire logo screen will appear), then the thermostat will display the thermostat model number and contact information. At installation, the contact information is blank and only the thermostat model number appears.
6. BLOWER EXTENSION FOR HUMIDITY CONTROL If the heating equipment has not run long enough to allow the humidifier to meet the humidity demand, the thermostat will continue the blower after a heat call. One second before the thermostat turns off the heating terminal(s), the fan terminal will be energized thus extending blower operation.
7. MONITORS – AIR FILTER, SERVICE HUMIDIFIER, UV LAMP, SERVICE HVAC The thermostat monitors time and can display scheduled reminders for the user to service their humidifier, change their filter and UV lamps, and to remind the user to schedule an HVAC system maintenance check.
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DP 10006198 01.05 B2203358B P.O. BOX 1467 • MADISON, WI 53701-1467 Printed in U.S.A.
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