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PRODUCT DATA

® U.S. Registered Trademark
Copyright © 1997 Honeywell Inc.   •            •   All Rights Reserved

T8524 Deluxe Electronic Thermostat

APPLICATION

The T8524 Deluxe Electronic Thermostat provides electronic
control of 18 to 30 Vac multistage heating and cooling systems.

T8524 FEATURES AND BENEFITS

•

Attractive styling complements any decor to the
homeowner’s delight.

•

Ease-of-use means fewer homeowner questions and
increased homeowner satisfaction.

•

Back lighting the large display makes the Liquid
Crystal Display (LCD) very easy to read.

•

Most frequently used keys are located by the LCD for
quick and easy access to information.

•

Models available with outdoor temperature sensor
capability for homeowner convenience. The sensor is
also more accurate than a thermometer.

•

Configurable features allows one model to be used to
replace many different models (less inventory, no need
to carry separate models to get these features).
—

°

F or 

°

C temperature display;

—

automatic or manual changeover;

—

electric or conventional heat fan operation;

—

adjustable heating cycle rate.

•

Minimum off time for cooling compressors and heat
pumps protects and extends the life of the equipment.

•

Easy installation, setup and system test saves
installer time and increases productivity.

•

System test simplifies troubleshooting and saves time
by overriding the time delays.

•

Setpoints are permanently held in memory (no
batteries used) and retained during power outages for
increased installer and homeowner convenience.

Contents

Application ........................................................................... 1
T8524 Features and Benefits ..............................................

1

Specifications ......................................................................

2

Ordering Information ...........................................................

2

Installation ........................................................................... 3
Wiring .................................................................................. 4
Settings ...............................................................................

6

Installer Setup .....................................................................

6

Installer System Test ...........................................................

8

Checkout ............................................................................. 10
Operation ............................................................................ 11
Wiring Diagram (Fig. 14) ..................................................... 12
Troubleshooting Guide ........................................................ 12

68-0202

Содержание T8524

Страница 1: ...figurable features allows one model to be used to replace many different models less inventory no need to carry separate models to get these features F or C temperature display automatic or manual changeover electric or conventional heat fan operation adjustable heating cycle rate Minimum off time for cooling compressors and heat pumps protects and extends the life of the equipment Easy installati...

Страница 2: ... individual unit may not exactly match the listed specifications Also This product is tested and calibrated under closely controlled conditions and some minor differences in performance can be expected if those conditions are changed Models See Table 1 Electrical Rating Input Power 18 to 30 Vac 50 60 Hz Load Rating See Table 2 Temperature Setpoint Range 40 F to 99 F 4 C to 37 C depending on model ...

Страница 3: ...uctions can damage the product or cause a hazardous condition 2 Check the ratings given in the instructions and on the product to make sure the product is suitable for your application 3 Installer must be a trained experienced service technician 4 After completing installation use these instructions to checkout the product operation CAUTION Disconnect power supply to prevent electrical shock or eq...

Страница 4: ...Fig 13 through 18 for typical hookups A letter code is located near each terminal for identification Refer to Table 3 for terminal designations Table 3 Terminal Designations and Descriptions a Some OEM models label the terminal for transformer common B Standard Terminal Designations Alternate Terminal Designations Typical Connection Function Terminal Type B Heating damper or changeover valve Outpu...

Страница 5: ...at Fig 4 Proper wiring technique Mounting Thermostat 1 Engage tabs at the top of thermostat and wallplate Fig 5 2 Press lower edge of case to latch NOTE To remove the thermostat from the wall first pull out at the bottom of the thermostat remove top last M6798A B PRESS LOWER EDGE OF CASE TO LATCH A ENGAGE TABS AT TOP OF THERMOSTAT AND WALLPLATE Fig 5 Mounting thermostat on wallplate Using Thermost...

Страница 6: ...ss and hold the Information i key with the increase and decrease keys until the first number is displayed All display segments appear for approximately three seconds before the number is displayed See Fig 8 and 9 To advance to the next Installer Setup press the Information i key To change a setting use the increase and decrease keys To exit the Installer Setup press and hold the Information i key ...

Страница 7: ...ends 1 Fan operation is extended 90 seconds after the call for heat ends Extended fan operation in cooling 20 0 No extended fan operation after the call for cool ends 1 Fan operation is extended 90 seconds after the call for cool ends Not used 21 thru 23 Outdoor temperature display models with OT terminals 24 0 No outdoor temperature is displayed 1 Outdoor temperature is displayed Needs a C7089B10...

Страница 8: ...out after five minutes without any key presses Press and hold the increase and decrease keys at the same time until two zeros appear All segments of the display will be displayed before the two zeros appear See Fig 10 and 11 Installer Setup Number Press Time key to Factory Setting Other Choices Press or key to change Actual Select change Display Description Display Description Setting Temperature ...

Страница 9: ...equipment system test 41 Fan comes on 40 Fan turns off Key or Switch Operation System Test SYSTEM KEY SYSTEM TEST i 60 Change from cooling or fan to key operation system test System 61 Heat test number is displayed System 62 Off test number is displayed System 63 Cool test number is displayed System 64 Auto test number is displayed FAN KEY SYSTEM TEST Fan 68 Fan on test number is displayed Fan 69 ...

Страница 10: ...is displayed to exit the system test The system test times out after five minutes without any key presses CHECKOUT Outdoor Temperature Sensor where applicable Allow the outdoor temperature sensor to soak in the outdoor air for a minimum of five minutes before taking a reading With an accurate thermometer 1 F 0 5 C measure the temperature at the sensor location allowing time for the thermometer to ...

Страница 11: ...gral error which is a deviation based on the length of error time The sum of the two errors is the P I error The cycle rate used to reach and maintain the setpoint temperature in computed using the P I The addition of the integral error is what differentiates the thermostat from many other electronic and electromechanical thermostats See Fig 13 Operation Sequence The thermostat energizes specific ...

Страница 12: ...how the outdoor temperature if installer setup number 24 is set to 1 W2 L1 HOT L2 M11309 FAN RELAY Y1 G C THERMOSTAT RC HEAT RELAY 1 R W1 L1 HOT L2 COMPRESSOR CONTACTOR 1 Y2 COMPRESSOR CONTACTOR 2 HEATING TRANSFORMER COOLING TRANSFORMER HEAT RELAY 2 OT OT B HEAT DAMPER OUTDOOR SENSOR COOL DAMPER O 2 2 3 3 3 1 POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED JUMPER RC TERMI...

Страница 13: ...o the thermostat Check that C terminal is connected to the system transformer Check for 24 Vac between C and R or RC and Y terminals If missing 24 Vac check if the circuit breaker is tripped reset the circuit breaker check if the system fuse is blown replace the fuse check if the system switch at the equipment is in the Off position set to the On position check wiring between thermostat and HVAC e...

Страница 14: ...T8524 DELUXE ELECTRONIC THERMOSTAT 68 0202 14 ...

Страница 15: ...T8524 DELUXE ELECTRONIC THERMOSTAT 68 0202 15 ...

Страница 16: ...trol Honeywell Limited Honeywell Limitée 155 Gordon Baker Road North York Ontario M2H 3N7 Honeywell Latin American Division Miami Lakes Headquarters 14505 Commerce Way Suite 500 Miami Lakes FL 33016 68 0202 J H 12 97 Printed in U S A Home and Building Control Honeywell Inc Honeywell Plaza P O Box 524 Minneapolis MN 55408 0524 Printed on recycled paper containing at least 10 post consumer paper fib...

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