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P R O D U C T S P E C I F I C AT I O N S Multi-Stage Heat /Cool Thermostats Models 8556 and 8538 (SMS 1) and (DSL 700) PRODUCT DESCRIPTION These Aprilaire® thermostats are designed for new or replacement multi-stage heat/cool applications. Each one represents the latest in solid-state, surface-mounted electronics and manufacturing techniques, incorporated into a unique, ultra-thin ABS plastic case. They offer “user-friendly” control {and programming with model 8556} of the heating and cooling system along with an easy-to-read vertical LCD that displays complete equipment operation status. An easily installed direct wire sub-base mounts on a standard vertical outlet box or any dry wall surface using provided anchors and hardware. STANDARD FEATURES 8556 8538 • Energy Star Compliance ■ • Meets CA Title 24 Requirements ■ • Selectable Celsius or Fahrenheit temperature display. ■ ■ • Fan button for continuous fan operation. ■ ■ • Built-in short cycle protection. ■ ■ • Electronic circuitry instead of conventional mechanical anticipator. ■ ■ • Copy button to allow one program to be copied to subsequent days. ■ • Internal keypad lockout switch to prevent unauthorized tampering. ■ ■ • Lockable access cover. ■ ■ • No battery required {always maintains the program and mode of operation following power outages of any duration}. ■ ■ • Occupied terminal output. ■ • Day/Night button for one-touch set-back. • Outdoor temperature sensor {optional}. ■ ■ • Indoor remote temperature sensor {optional}. ■ ■ • Adapter plate to cover unpainted walls or discolored wallpaper {optional}. ■ ■ • Independent circuit switching {allows 24-volt AC or DC power}. ■ ■ • Remote clock terminals for automatic temperature set-back. • Selectable fan with heat call. ■ ■ • Two free LEDs. ■ ■ • Dry contact relay outputs. ■ ■ • Switchable LCD service symbols {icons}. ■ ■ • 7 day programming with 2 or 4 events per day {selectable}. ■ • 12- or 24-hour clock. ■ • Temperature override {3 hours} and Continuous override {Hold}. ■ • 2˚F {1˚C} minimum Heat/Cool separation. ■ ■ • Short cycle protection – minimum on/off time {2- or 4-minute selectable}. ■ ■ • Auto changeover. ■ ■ • 2-stage heat; 2-stage cool. ■ ■ • O and B reversing valve outputs. ■ ■ ■ Product Profile: Actual Size WIRING DIAGRAM SMS-1 or DSL-700 Models 8556, 8538 EQUIPMENT B Changeover – Cool O 2nd Stage Heat W2 2nd Stage Cooling Y2 O W2 Y2 W1 Y1 G R NOTE 1 24V 24V(c) W1 Fan Relay G RS+v C CLK1 CLK2 FACTORY WIRING 24V FIELD WIRING NO COM Y2 Y1 2nd Stage Cooling 1st Stage Cooling G Fan R 24V hot – used with terminals above to complete switched circuit. 24V 24V {AC or DC} hot from transformer {positive if DC voltage source is used}. B NO, COM, NC RS2 R 2nd Stage Heat 1st Stage Heat O LED2 RS1 {com} NOTE 2 REMOTE SENSOR{S} CLOCK TERMINALS FREE RELAY Y1 W2 W1 24V{c} 24V {AC or DC} common from transformer {negative if DC voltage source is used}. LED1 1st Stage Cooling {hot} 24 V 120 V 1st Stage Heat B EQUIPMENT TERMINALS Changeover – Heat OUTPUT TERMINALS Aprilaire® ® PerfectTemp Thermostat Thermostat Reversing Valve, Cooling – energizes in Cool mode {8556 only}. Reversing Valve, Heating – energizes in Heat mode {8556 only}. Single Pole Double Throw relay with default as indicated. During the Night event the relay is energized {8556 only}. LED1, Completing a circuit from the hot side of LED2 the thermostat transformer {through a switch} to either of these terminals illuminates the appropriate LED located on top of the thermostat. RS1, RS2, RS+v CLK1, CLK2 NC NOTE 1: Do not remove jumper unless using a transformer different from system transformer to power the thermostat. NOTE 2: Thermostat will accept 24V DC. Connect pos. {+} to 24V terminal and neg. {–} to 24V{c} terminal. These terminals are used to connect Remote Sensors {i.e. 8040, 8041}. A completed circuit between these two terminals automatically adjusts the set point to the night setting in the current mode of operation {8538 only}. PRODUCT SPECIFICATIONS Rated Voltage 20 to 30 Vac, 24 Volts Nominal Rated AC Current .050 Amps to 0.75 Amps continuous per output with surges to 3 Amps maximum Rated DC Current 0.0 Amps to 0.75 Amps continuous per output with surges to 3 Amps maximum Control Range Heating: 38 to 88˚F in 1˚ steps {5 to 30˚C in 1˚ steps} Cooling: 60 to 108˚F in 1˚ steps {16 to 40˚C in 1˚ steps} Thermostat Measurement Range 28 to 124˚F {0 to 48˚C} ODT Measurement Range –50 to 124˚F {–48 to 48˚C} Control Accuracy ±1˚F at 68˚ {0.5˚C at 20˚C} Minimum Deadband Dimensions {between heating and cooling set points} 2˚F {1˚C} 41/2"H x 5"W x 7/8"D {114mm x 127mm x 22mm} 41/2"H x 4"W x 7/8"D {114mm x 102mm x 22mm} 8556 8538 Available Equipment Terminals 24 Vac, 24 Vac{c}, W1, W2, Y1, Y2, G Minimum Wires Required 7 NOTE: These thermostats contain electronic circuitry in place of the conventional mechanical anticipator. Specifications are subject to change without notice. ® P.O. BOX 1467 • MADISON, WI 53701-1467 • Call toll-free 1-800/334-6011 • FAX 608/257-4357 • Products For Better Indoor Air Quality ™ Form #5153 3.1.03 ©Research Products Corporation 2003