Instruction/ maintenance manual of the product 8870 Aprilaire
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Installation Instructions MODEL 8870 These instructions are for connecting the Thermostat to the HV AC equipment. T o connect communication features, please reference the Communicating Thermostat System Installation Manual.
INST ALLA TION INSTRUCTIONS MANUAL T ABLE OF CONTENTS W arning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Model 8870 Thermostat Specifications . . . .
1 READ COMPLETE SAFETY & INST ALLA TION INSTRUCTIONS BEFORE ST ARTING W ARNING 1. 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.
MODEL 8870 THERMOST A T SPECIFICA TIONS: Control V oltage 24V AC ± 20% Switched V oltage 18 – 30V AC Maximum Operating Current 2.0A total at rated voltage, through all outputs. 1.0A through any one output. Maximum Surge Current 2.0A Control Accuracy ± 1.
2. WHA T’S IN THE BOX • Thermostat ( Figure 1 ): front panel, cover , and base • Installation Manual • Owners Manual • Hardware bag: screws and wall anchors FIGURE 1 3. SELECT THE THERMOST A T LOCA TION Determine if the thermostat will be operating alone, or with remote temperature sensors.
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.
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.
6 6. SETTING THE DIP SWITCHES Set the dip switches located on the thermostat circuit board ( Figure 4 ) according to the application needs ( T able 2 ).
T ABLE 2 APPLICA TION SWITCH #1 SWITCH # 2 SWITCH # 3 SWITCH # 4 Single Stage Furnace & AC Servant Fossil Single H / C T wo Stage Furnace & T wo Stage AC Servant Fossil Multi H / C Roof T op U.
8 FIGURE 5.
9 7. WIRING THE THERMOST A T (Cont.) c) Check each wire to ensure it is securely fastened, not broken, and exposed wires are not touching. 8. REASSEMBLE THE THERMOST A T No tools required – line up pins on circuit board with the corresponding terminal blocks.
10 Mode Fan Enter SCROLL / SET-UP BUTTONS ADJUST BUTTONS MESSAGE DISPLAY MAIN DISPLAY REMOTE NETWORK OVERRIDE COOL HEAT EM. -AUX DEHUM HUMIDIFY BIAS DIF1 DIF2 C FAN RH ON ROOM F C F R O FIGURE 6 Use the Check Out Procedure ( Figure 7 , on the next page) to determine if the thermostat is controlling the HV AC equipment.
11 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.
10. OPTIONAL HV AC SET -UP FEA TURES There are a number of HV AC 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) TEMPERA TURE CONTROL OPTIONS 1.
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 HEA T mode (does not ef fect Emergency Heat operation).
14 FIGURE 8 11. TO ACCESS THESE HV AC SET -UP FEA TURES (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.
15 FIGURE 8 (Cont.).
IMPORTANT! The B terminal is for reversing valve-heat. DO NOT connect the B terminal to common side of transformer. NOTE: HVAC installer may need to connect 24V AC to th e R and C terminals to check the HVAC operation.
FAN RELAY 2ND STAGE HEAT 1ST STAGE HEAT R TWO-STAGE FURNACE C G W1 Y1 W2 Y2 1ST STAGE COOL 2ND STAGE COOL L1 L2 120 VAC 24 VAC 1ST STG COOL 2ND STG COOL TWO-STAGE AIR CONDITIONER Y1 C Y2 IMPORTANT! The B terminal is for reversing valve-heat. DO NOT connect the B terminal to common side of transformer.
18 FAN RELAY 2ND STAGE HEAT 1ST STAGE HEAT R ROOF TOP UNIT C G W1 W2 Y2 Y1 L1 L2 120 VAC 24 VAC IMPORTANT! The B terminal is for reversing valve-heat. DO NOT connect the B terminal to common side of transformer.
FAN RELAY R AIR HANDLER C G Y1 1ST STAGE COOL L1 L2 120 VAC 24 VAC IMPORTANT! The thermostat B terminal is for reversing valve-heat. DO NOT connect the B terminal to common side of transformer.
FAN RELAY AUX HEAT R INDOOR HEAT PUMP UNIT C G W1 Y1 COMPRESSOR L1 L2 120 VAC 24 VAC IMPORTANT! The thermostat B terminal is for reversing valve-heat. DO NOT connect the B terminal to common side of transformer.
FAN RELAY 2ND STAGE HEAT 1ST STAGE HEAT R INDOOR HEAT PUMP UNIT C G W1 Y1 W2 Y2 1ST STAGE COMPRESSOR 2ND STAGE COMPRESSOR L1 L2 120 VAC 24 VAC G Y1 W1 Y2 W2 RH RC O APRILAIRE MODEL 8870 THERMOSTAT COMMUNICATION TERMINALS B C RSB RSR RSC R RSA B+ A- A+ B- REF REMOTE SENSOR(S) Y1 O B W1 C 1ST STG COMP.
G Y1 W1 Y2 W2 RH RC O APRILAIRE MODEL 8870 THERMOSTAT COMMUNICATION TERMINALS B C RSB RSR RSC R RSA B+ A- A+ B- REF REMOTE SENSOR(S) FAN RELAY 1ST STAGE HEAT R ONE STAGE FURNACE C G W1 Y1 1ST STAGE CO.
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B2202660 REV . 011/01 P .O . BO X 1467 • MADISON, WI 53701-1467 THE BE ST IN IN DOOR AIR CO M FORT ® The Aprilaire ® Indoor Air Comfort System is an integr ated group of air quality enhancement products designed to work with heating and cooling systems to make homes more comfortable.
An important point after buying a device Aprilaire 8870 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Aprilaire 8870 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Aprilaire 8870 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Aprilaire 8870 you will learn all the available features of the product, as well as information on its operation. The information that you get Aprilaire 8870 will certainly help you make a decision on the purchase.
If you already are a holder of Aprilaire 8870, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Aprilaire 8870.
However, one of the most important roles played by the user manual is to help in solving problems with Aprilaire 8870. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Aprilaire 8870 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
