Honeywell T8424C specifications

PRODUCT DATA

® U.S. Registered Trademark

T8400C, T8401C and T8424C,DElectronic 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 loca ted 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 he ld 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

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

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

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

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

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

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

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

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

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