Aprilaire 8476 manual

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Table of contents for the manual

  • Page 1

    Model 84 76 Thermostat with Event-Based ™ Air Cleaning READ AND SAVE THESE INSTRUCTIONS Safety & Installation Instructions[...]

  • Page 2

    2 3 Installation location recommendations ................................................................ 3 Outdoor temperature sensor (optional) ................................................................ 4 Thermostat mounting .............................................................................. 5 Power & reset options .........[...]

  • Page 3

    4 5 OUTDOOR TEMPERA TURE SENSOR (OPTIONAL) Outdoor temperature can be measured by attaching an 8052 sensor to the S1 and S2 terminals. System setting #05 (Remote sensor) is used to enable sensor . Heat pump applications can use the outdoor temperature to effectively utilize the heat pump: • When the outdoor temperature is less than the Low Balanc[...]

  • Page 4

    6 7 WIRING TERMINAL Wire specifications 18-24 gauge thermostat wire Installation notes • Ensure power at the HVAC equipment is off. • Loosen screw terminals, insert stripped wire and re-tighten. • Push the excess wire back into the opening and plug the wall opening to prevent drafts. INST ALLA TION RC – 24 VAC supply cooling* R – 24 VAC s[...]

  • Page 5

    8 9 INST ALLA TION WIRING – SINGLE TRANSFORMER (USE JUMPER WIRE) FOR HEA T PUMP SYSTEM 1st AUX HEA TING 1st COMPRESSOR FA N REVERSE VA LV E FA ULT DETECT 2nd AUX HEA TING 2nd COMPRESSOR OUTDOOR TEMP SENSOR HEA T PUMP TRANSFORMER C G Y W R L S1 S2 O/B W2 Y2 RC JUMPER 1st AUX HEA TING 1st COMPRESSOR FA N REVERSE VA LV E FA ULT DETECT 2nd AUX HEA TI[...]

  • Page 6

    10 11 SETUP & TESTING SYSTEM SETUP INSTRUCTIONS (CONTINUED) The Model 8476 thermostat has the option of being used in heat pump or heat/cool systems. Switch SW1 located on the back of the thermostat’ s face is used to select this. System setting number 00 will only be shown on these models to display the position of SW1. SW1 HEA T PUMP HEA T/[...]

  • Page 7

    12 13 SETUP & TESTING System setting Setting range, default in bold 09 1st stage differential 1°F (0.5°C) 1°F to 4°F (0.5°C to 2°C) 10 2nd stage differential 1°F (0.5°C) 1°F to 4°F (0.5°C to 2°C) 11 3rd stage differential (heat pump only) 1°F (0.5°C) 1°F to 4°F (0.5°C to 2°C) 12 Reverse valve (heat pump only) 0 – O/B energiz[...]

  • Page 8

    14 15 SYSTEM TEST MODE The system test mode is used to test a system after installation. The outputs of the thermostat can be manually activated one at a time to test their function. The following instructions show how to enter the test mode and turn outputs on and off. The charts on the following pages show the output status for each test step for[...]

  • Page 9

    16 17 SETUP & TESTING T est steps for Heat / Cool Step Key Input System Setting Display (Output) #2 01 HEA TING ON (W) 02 HEA TING ON (W2) 01 COOLING ON (Y) 02 COOLING ON (Y2) 01 FAN ON (G) #50 Heat 1st [UP] 0 : Gas ON 1 : Elec ON ON 2nd [UP] 0 : Gas ON ON 1 : Elec ON ON ON [DOWN] #51 Cool 1st [UP] ON ON 2nd [UP] ON ON ON [DOWN] #52 Fan [UP] ON[...]

  • Page 10

    18 19 QUICK REFERENCE TO CONTROLS & DISPLA Y NOTE: BACKLIGHT IS ACTIVA TED WITH FIRST BUTTON PRESS AND AUTOMA TICALL Y TURNS OFF . Includes Event-Base d ™ Air Cleaning CURRENT INDOOR TEMPERA TURE SYSTEM MODE SETTING CLEAN AIR SETTING SYSTEM MODE CLEAN AIR BA TTERY DOOR CURRENT SCHEDULE PERIOD MESSAGE CENTER LOW BA TTERY WARNING QUICK REFERENC[...]

  • Page 11

    20 21 TROUBLESHOOTING DISPLA Y IS BLANK • Check circuit breaker and reset if necessary . • Make sure power switch at heating & cooling system is on. • Make sure furnace door is closed securely . • If thermostat is battery powered, make sure fresh AA alkaline batteries are correctly installed. TEMPERA TURE SETTINGS DO NOT CHANGE Make sur[...]

  • Page 12

    22 23 SPECIFICA TIONS Electrical Operating voltage 24 VAC (18 – 30 VAC) Current Maximum: 2.5A (total), 1.0A (single output) Maximum surge current: 5A Power supply Dual power . Can be battery or 24 VAC powered. When both the sources are available, battery will be used as back up power . Battery power Battery power: AA size alkaline battery x 2 Bat[...]

  • Page 13

    24 P.O. Box 1467 • Madison, WI 53701-1467 • Phone: 800/334-6011 • Fax: 608/257-4357 www.aprilairepartners.com 61000893 12.11 B2205693A Patent Pending © 2011 Aprilaire – A division of Research Products Corporation[...]