Aprilaire 8570 Programmable Thermostat
SAFETY INSTRUCTIONS
Read this Installation Manual before beginning installation of the Aprilaire® 8570 Thermostat. For questions call Research Products Corporation at (800) 334-6011.
WARNING
- 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.
- Improper installation may cause serious injury from electrical shock. This product must be installed by a qualified heating and air conditioning contractor in accordance with NEC Standards and applicable local and state codes.
- Mercury is toxic and may be hazardous to health. Any replaced thermostats containing mercury must be disposed of properly. Contact local authorities for disposal information.
MODEL 8570 SPECIFICATIONS
Electrical
- Thermostat Voltage: 24-volts ± 20% AC or DC
- Total Load Current: 5A
- Single Output Load Current: 2A
Thermal
- Operating Range: 32°F – 99°F (0 C – 37 C)
- Display Accuracy: ±1°F between 60°F and 80°F, ±2°F outside this range
- Control Accuracy: ±1°F
- Control Range Heat: 40°F – 88°F (4 C – 30 C)
- Control Range Cool: 42°F – 90°F (6 C – 32 C)
- Heat/Cool Deadband: Adjustable 2° or 5° F or C
- 1st Stage Differential: Adjustable 1°F – 4°F (1°F default)
- 2nd Stage Differential: Adjustable 1°F – 4°F (1°F default)
- Temperature Offset: Adjustable 1°F – 4°F
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 Zoned Comfort 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. All wire is standard 18-24 gauge thermostat cable.
When this thermostat is connected to a Model 6504 as shown in Figure 2, only one four-wire cable need be run from the thermostat to the Model 6504. Use standard 18-24 gauge thermostat cable.
| Application | # Wires | Diagram (Page) |
| Single-Stage Furnace/AC | 5 | 1 (9) |
| Two-Stage Furnace/AC | 7 | 2 (10) |
| Two-Stage Roof Top Unit | 7 | 3 (11) |
| Boiler w/AC (2-transformer) | 6 | 4 (12) |
| Radiant 1st Stage Heat, Furnace 2nd Stage and AC | 6 | 5 (13) |
| Single-Stage Heat Pump | 6 | 6 (14) |
| Single-Stage Heat Pump w/Two Stages Aux. Heat | 7 | 7 (15) |
| Two-Stage Heat Pump | 8 | 8 (16) |
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) – 48″ maximum height for forward reach and 54″ maximum height for side reach. - Thermostat can be mounted to a vertical junction box (j-box).
- DO NOT mount the thermostat:
- behind doors, in corners or other dead air spaces.
- in direct sunlight or near lamps, appliances or other sources of heat.
- on an outside wall or wall exposed to an unconditioned space (i.e. garage).
- in the flow path of a supply register, in stairways or near outside doors.
- on a wall where concealed pipes or ductwork could influence the sensor.
- near sources of electrical interference such as arcing switch contacts.
If installing an indoor temperature sensor…
- Mount the thermostat where it can be readily accessed.
Note that the backlighting illuminates whenever a button is pressed. - Thermostat can be mounted on a vertical junction box (j-box).
- DO NOT mount the thermostat where the operating range temperatures will be exceeded (i.e. attic or unventilated equipment room).
- Mount the sensor in the same location as if installing a thermostat alone.
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