Aprilaire 8870 Installation Instructions Manual
Communicating thermostat
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Also See for 8870:
- System installation manual (24 pages) ,
- Operating instructions manual (11 pages) ,
- Installation instructions manual (15 pages)
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Summary of Contents for Aprilaire 8870
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Page 1: Installation Instructions
Installation Instructions MODEL 8870 These instructions are for connecting the Thermostat to the HVAC equipment. To connect communication features, please reference the Communicating Thermostat System Installation Manual. -
Page 2: Table Of Contents
Model 8870 Thermostat Specifications ........ -
Page 3: Warning
READ COMPLETE SAFETY & INSTALLATION INSTRUCTIONS BEFORE STARTING 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. 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. -
Page 4: Model 8870 Thermostat Specifications
MODEL 8870 THERMOSTAT SPECIFICATIONS: Control Voltage Switched Voltage Maximum Operating Current Maximum Surge Current Control Accuracy Control Range Operating Range 1. HVAC SYSTEM PRE-INSTALLATION CHECK LIST Before getting started determine what type of heating system is/will be installed in the house. -
Page 5: What's In The Box
2. WHAT’S IN THE BOX • Thermostat (Figure 1 ): front panel, cover, and base • Installation Manual • Owners Manual • Hardware bag: screws and wall anchors FIGURE 1 Front Panel 3. SELECT THE THERMOSTAT LOCATION Determine if the thermostat will be operating alone, or with remote temperature sensors. If the unit is stand-alone there are certain measures that must be taken to ensure accurate temperature control. -
Page 6: Disassembly
DO NOT locate the thermostat: • Behind doors, in corners or other dead air spaces. • In direct sunlight or near lamps, appliances or other sources of radiant heat. • On an outside wall or wall exposed to an unconditioned space (i.e. garage, etc.). •... -
Page 7: Mount Base To Wall
FIGURE 3 5. MOUNT BASE TO WALL There are four screw holes located on the base of the thermostat; two are for a junction box mounting, along with two for alternate mounting spacing. Use one of the holes on the top and one on the bottom. -
Page 8: Setting The Dip Switches
FIGURE 4 6. SETTING THE DIP SWITCHES Set the dip switches located on the thermostat circuit board (Figure 4) according to the application needs (Table 2 ). Figure 4 shows what each switch corresponds to depending on posi- tion. Switch one should be set in the “OFF Servant” position unless you plan to broadcast readings from remote temperature sensors to other thermostats in the system when there is no communication system in place. -
Page 9: Wiring The Thermostat
TABLE 2 APPLICATION Single Stage Furnace & AC Two Stage Furnace & Two Stage AC Roof Top Unit (Two Stage Heat & Two Stage Cool) Boiler with AC (Two Transformers) Single Stage Heat Pump Two Multi-stage Heat Pump First Stage Radiant Floor Heat Second Stage Furnace One Stage of Cooling 7. - Page 10 FIGURE 5...
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Page 11: Reassemble The Thermostat
7. WIRING THE THERMOSTAT (Cont.) c) Check each wire to ensure it is securely fastened, not broken, and exposed wires are not touching. 8. REASSEMBLE THE THERMOSTAT No tools required – line up pins on circuit board with the corresponding terminal blocks. Use your hands to push the front panel securely to the mounted base. -
Page 12: Main Display
FIGURE 6 ADJUST BUTTONS Use the Check Out Procedure (Figure 7, on the next page) to determine if the thermostat is controlling the HVAC equipment. MESSAGE DISPLAY DIF1 ROOM DIF2 BIAS NETWORK OVERRIDE HUMIDIFY DEHUM REMOTE HEAT -AUX Mode COOL Enter SCROLL/ SET-UP... -
Page 13: Checkout Procedure
FIGURE 7 CHECK-OUT PROCEDURE CAUTION: The following check-out procedure will turn the heating and cooling equipment on and off. Do not operate in cooling at low outdoor temperatures. Do not operate in heating at high outdoor temperatures. Refer to equipment manufacturer specifications for safe operating temperatures. STEP PRESS LOOK FOR... -
Page 14: Optional Hvac Set-Up Features
10. OPTIONAL HVAC SET-UP FEATURES There are a number of HVAC features that can be configured for the particular application. These include temperature control options, display options and high/low balance points (heat pumps only). A) TEMPERATURE CONTROL OPTIONS 1. OFFSET – allows the user to offset the displayed room temperature ± 3°F from true temperature. -
Page 15: Display Options
B) BALANCE POINTS (Cont.) 1. LOW BALANCE POINT – the outdoor temperature below which compressor terminals will not be energized. 2. HIGH BALANCE POINT – the outdoor temperature above which the auxiliary heat terminal will not be energized in the HEAT mode (does not effect Emergency Heat operation). C) DISPLAY OPTIONS 1. - Page 16 11. TO ACCESS THESE HVAC SET-UP FEATURES (Cont.) Set-Up is menu driven but only one menu item is visible at a time. Figure 8 shows the entire Main Menu. Selecting any one of the Main Menu items (by pressing the Enter button) will enter a corresponding Sub-Menu.
- Page 17 FIGURE 8 (Cont.)
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Page 18: Wiring Diagrams
HVAC installation, leave the R and C terminals connected to ensure the HVAC system operates. If the automation system is installed before the HVAC wiring, then DO NOT connect HVAC wires to R and C. 8870 THERMOSTAT 1ST STAGE COOL 24V FIELD WIRING... - Page 19 TWO-STAGE AIR CONDITIONER COOL COOL APRILAIRE MODEL 8870 THERMOSTAT NOTE: HVAC installer may need to connect 24V AC to the R and C terminals to check the HVAC operation. If the automation system is to be installed after the HVAC installation, leave the R and C terminals connected to ensure the HVAC system operates.
- Page 20 FACTORY WIRING OPTIONAL 24V FIELD WIRING (SEE NOTE) APRILAIRE MODEL 8870 THERMOSTAT NOTE: HVAC installer may need to connect 24V AC to the R and C terminals to check the HVAC operation. If the automation system is to be installed after the HVAC...
- Page 21 R and C terminals connected to ensure the HVAC system operates. If the automation system is installed before the HVAC wiring, then DO NOT connect HVAC wires to R and C. APRILAIRE MODEL 8870 THERMOSTAT NOTE BOILER HEAT...
- Page 22 VALVE HEAT OUTDOOR HEAT PUMP UNIT 24V FIELD WIRING FACTORY WIRING OPTIONAL 24V FIELD WIRING (SEE NOTE) APRILAIRE MODEL 8870 THERMOSTAT NOTE IMPORTANT! The thermostat B terminal is for reversing valve-heat. DO NOT connect the B terminal to common side of transformer.
- Page 23 COMP. HEAT OUTDOOR HEAT PUMP UNIT 24V FIELD WIRING FACTORY WIRING OPTIONAL 24V FIELD WIRING (SEE NOTE) APRILAIRE MODEL 8870 THERMOSTAT NOTE IMPORTANT! The thermostat B terminal is for reversing valve-heat. DO NOT connect the B terminal to common side of transformer.
- Page 24 HEAT 24V FIELD WIRING FACTORY WIRING OPTIONAL 24V FIELD WIRING (SEE NOTE) Aprilaire Model 8024 24-volt Relay Pack (not supplied) E/W2 NOTE: HVAC installer may need to connect 24V AC to the R and C terminals to check the HVAC operation. If the Automation system is to be installed after the HVAC installation, leave the R and C terminals connected to ensure the HVAC system operates.
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Page 28: Zone Control Systems
Indoor Air Comfort System is an integrated group of air quality enhancement products designed to work with heating and cooling systems to make homes more comfortable. For the best in indoor air quality, install Aprilaire brand products, to solve your customers’ Indoor Air Comfort needs. Aprilaire...
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