Honeywell T8424C Manuel d'utilisateur télécharger pdf

PRODUCT DATA

® U.S. Registered Trademark

68- 0180- 3

T8400C, T8401C and T8424C,D

Electronic Thermostats

APPLICATION

The T8400C and T8401C Standard Electronic Thermostats

provide single-stage, non-programmable temperature control

for 24V heating-cooling systems with manual changeover

from heat to cool.

The T8424C Electronic Multistage Thermostat provides two-

stage heat and one-stage cool control.

The T8424D Electronic Multistage Thermostat provides two-

stage heat and two-stage cool control.

FEATURES

• Attractive styling complements any decor to the

homeowner’s delight.

• Ease-of-use means fewer homeowner questions and

increased homeowner satisfaction.

• Large display for quick easy readability.

• Conveniently sized 3-1/2 x 3-1/2 thermostat with

optional decorator cover plates (3-7/8 in. x 3-7/8 in. and

5-3/4 in. x 5-3/4 in.) makes it easy to install in a variety

of locations.

• Keys are located for easy access.

• Fan and system switches are located on the lower

edge to eliminate accidental setting changes.

• Easy installation, setup and self-test saves time and

increases installer productivity.

• Manual changeover from heat to cool eliminates

unexpected system operation.

• °F or °C temperature display for added model

flexibility.

• Selectable heating cycle rate (1, 3, 4, 5, 6 or 9, 12 cph)

for a variety of applications which reduces the amount

of inventory.

• Cooling cycle rate is fixed (3 cph), the standard setting

for compressors, for speedy installation.

• Setpoints are permanently held in memory (no

batteries used) and retained during power outages for

increased installer and homeowner convenience.

• Power stealing and hard wired models available for

virtually all equipment and application needs including

gravity or radiating systems, hydronic heat,

condensing gas furnaces, gas or oil forced air and

electric heat.

T8400C and

T8401C

T8424C,D

Contents

Application ........................................................................ 1

Features ........................................................................... 1

Specifications ................................................................... 2

Ordering Information ........................................................ 2

Installation ........................................................................ 3

Settings and Adjustments ................................................. 8

Operation .......................................................................... 10

Checkout .......................................................................... 12

Troubleshooting ................................................................ 13

1 2 3 4 5 6 ... 15 16

Résumé du contenu

Page 1 - Electronic Thermostats

Page 2 - SPECIFICATIONS

T8400C, T8401C AND T8424C,D ELECTRONIC THERMOSTATS68-0180-3 1010. Press the ▲ key to display the heat cycle rate of 1, 3, 4, 5, 6, 9 or 12. When set a

Page 3 - MERCURY NOTICE

T8400C, T8401C AND T8424C,D ELECTRONIC THERMOSTATS11 68-0180-3Fig. 19. T8400C power 0stealing internal schematic.Fig. 20. T8401C hardwired internal sc

Page 4 - Wallplate to Wall

T8400C, T8401C AND T8424C,D ELECTRONIC THERMOSTATS68-0180-3 12Table 3. Sequence of Operations.aIn electric heat models, W and G are energized with cal

Page 5

T8400C, T8401C AND T8424C,D ELECTRONIC THERMOSTATS13 68-0180-3TROUBLESHOOTINGRefer to Fig. 21 for the proper troubleshooting procedure.Fig. 21. Troubl

Page 6

68-0180-3 14

Page 7

15 68-0180-3

Page 8 - SETTINGS AND ADJUSTMENTS

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Page 9 - Set Temperature Setpoint

T8400C, T8401C AND T8424C,D ELECTRONIC THERMOSTATS68-0180-3 2ORDERING INFORMATIONWhen purchasing replacement and modernization products from your TRAD

Page 10 - OPERATION

T8400C, T8401C AND T8424C,D ELECTRONIC THERMOSTATS3 68-0180-3Fig. 1. T8400/T8401 Thermostat dimensions in in. (mm).Fig. 2. T8424 Thermostat dimensions

Page 11 - Sequence of Operations

T8400C, T8401C AND T8424C,D ELECTRONIC THERMOSTATS68-0180-3 4LocationInstall the thermostat about 5 ft (1.5m ) above the floor in an area with good ai

Page 12 - CHECKOUT

T8400C, T8401C AND T8424C,D ELECTRONIC THERMOSTATS5 68-0180-3Fig. 5. Mounting the T8424 wallplate to wall.WiringIMPORTANTUse an 18-gauge maximum wire

Page 13 - SYMPTOM POSSIBLE CAUSE ACTION

T8400C, T8401C AND T8424C,D ELECTRONIC THERMOSTATS68-0180-3 6Fig. 9. T8424 wiring connections.The T8400C Thermostats steal power through the heating a

Page 14 - 68-0180-3 14

T8400C, T8401C AND T8424C,D ELECTRONIC THERMOSTATS7 68-0180-3Fig. 13. T8400C/T8401C heat only wiring diagram for controlling incompatible or 3-wire zo

Page 15 - 15 68-0180-3

T8400C, T8401C AND T8424C,D ELECTRONIC THERMOSTATS68-0180-3 8Mounting Thermostat to Wallplate1. Engage the tabs at the top of the thermostat and wallp

Page 16

T8400C, T8401C AND T8424C,D ELECTRONIC THERMOSTATS9 68-0180-3most systems). When using an electric heat thermostat, the fan starts and stops with the