Download PRODUCT SPECIFICATIONS Multi-Stage Heat

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
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Energy Star Compliance
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Meets CA Title 24 Requirements
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Selectable Celsius or Fahrenheit temperature display.
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Fan button for continuous fan operation.
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Built-in short cycle protection.
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Electronic circuitry instead of conventional mechanical anticipator.
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Copy button to allow one program to be copied to subsequent days.
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Internal keypad lockout switch to prevent unauthorized tampering.
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Lockable access cover.
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No battery required {always maintains the program and mode
of operation following power outages of any duration}.
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Occupied terminal output.
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Day/Night button for one-touch set-back.
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Outdoor temperature sensor {optional}.
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Indoor remote temperature sensor {optional}.
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Adapter plate to cover unpainted walls or discolored wallpaper {optional}.
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Independent circuit switching {allows 24-volt AC or DC power}.
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Remote clock terminals for automatic temperature set-back.
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Selectable fan with heat call.
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Two free LEDs.
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Dry contact relay outputs.
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Switchable LCD service symbols {icons}.
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7 day programming with 2 or 4 events per day {selectable}.
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12- or 24-hour clock.
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Temperature override {3 hours} and Continuous override {Hold}.
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2˚F {1˚C} minimum Heat/Cool separation.
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Short cycle protection – minimum on/off time {2- or 4-minute selectable}.
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Auto changeover.
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2-stage heat; 2-stage cool.
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O and B reversing valve outputs.
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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