Honeywell T775B - User Manual

1 63-2489
T775A,B,C,D
Remote Temperature Controller
The T775 family of Electronic Remote Tem-
perature Controllers provide on-off temperature
control for ducts, tanks, chillers, heating and re-
frigeration units, and other applications where
electronic accuracy in addition to remote sensing
is desired.
In addition, certain models of the T775 family
of controllers provide on-off temperature control
of heating, cooling, and ventilating systems in agri-
cultural confinement buildings, storage areas and
heavy industrial applications.
T775A,B
T775C,D
■ T775A models provide staged on-off control with
one temperature input and one to four relay output
stages.
■ T775B models provide staged on-off control with
two temperature inputs and two to four relay output
stages.
■ T775C models provide staged on-off control with
one temperature input and four relay output stages.
■ T775D models provide staged on-off control with
two temperature inputs and four relay output stages.
■ T775C,D models meet National Electrical Code
(Article 547) requirements for animal confinement
buildings.
■ Setpoint temperature range is -40° to +220° F (-40°
to +104°C).
■ Ambient temperature range is -30° to +140°F for
one and two stage models and -30° to +125°F for
three and four stage models.
■ Linear platinum temperature sensor with T775A,B.
■ Water-tight linear platinum temperature sensor with
T775C,D.
■ Adjustable temperature range and differential.
■ LCD indication for mode and output status.
■ Keypad provides ease of programming and operation.
■ Accuracy is within +/- 1°F (at nominal operating
ambient temperature of 77°F and voltage input).
■ Stage(s) independently programmed for heating or
cooling.
■ 24/120/240 Vac input voltage.
■ Spdt relay outputs.
IMPORTANT: The T775 is an operating control, not a
limit or safety control. If used in applications requir-
ing safety or limit controls, a separate safety or limit
control device should be used in conjunction with the
T775.
G.R. • 12-94 • ©Honeywell Inc. 1994
63-2489
CONTENTS
Specifications ................................................. 2
Ordering Information ..................................... 2
Installation ..................................................... 5
Description/Operation ................................... 8
Checkout....................................................... 11

Honeywell T775B Specifications

General

Brand	Honeywell
Model	T775B
Category	Temperature Controller
Language	English

Summary

Specifications

Model and Feature Overview

Summarizes T775 models, their capabilities, and key features like staged control and accuracy.

Model Specifications Table

Details specific T775 models, inputs, outputs, and maximum operating ambient temperature.

Electrical Ratings

Specifies voltage input and power consumption for different stages.

Contact Ratings

Lists relay contact ratings including HP, FLA, LRA, VA pilot duty, and Vac.

Sensor and Accuracy Details

Covers sensor type, accuracy, setpoint range, and operating ambient/humidity.

Approvals and Dimensions

Lists certifications and refers to figures for controller dimensions.

Accessories

Lists optional accessories available for T775 controllers.

Ordering Information

Contact and Support

Provides contact details for Honeywell sales offices for inquiries and ordering.

Installation

Installation Precautions

Advises reading instructions, checking ratings, and disconnecting power before installation.

Location and Mounting

Details how to mount the controller enclosure on a suitable surface.

Sensor Installation and Wiring

Explains sensor placement, wiring, shielding, and mounting for accurate sensing.

Wiring Safety and Guidelines

Emphasizes disconnecting power before wiring and complying with codes.

Description;Operation

Control Algorithm Logic

Explains on/off control for heating/cooling, setpoints, and differentials for each stage.

Keypad Programming and Display Interface

Describes how to use the keypad and interpret the LCD for programming and status display.

Error Message Interpretation

Lists and explains common error codes like SF, EF, CF, OF, CE, OE, AE.

Setpoint Calibration and Wire Length

Guides on using sensor wire lengths and calibration offsets for accuracy.

Checkout

Post-Installation Checkout Procedure

Outlines steps to verify settings, record temperatures, and check load energization.

Checkout Example and Table

Provides a practical example of a completed checkout table for verification.