Honeywell W7762B, W7762A SPECIFICATION DATA

Excel 10

W7762A,B HYDRONIC CONTROLLERS

SPECIFICATION DATA

FEATURES

• LONMARK® HVAC profile #8020.

• Stand-alone operation or on high-speed 78 kilobit

Echelon

• Uses Echelon LonTalk

• FTT10A Transceiver.

• Direct connection of thermal actuators.

• Factory-configured default parameters.

• Wide range of supported valves and actuators.

• Available with setpoint knob for wall mounting.

®

LONWORKS© network.

®

protocol.

GENERAL

The W7762A and B Controllers are Hydronic Controllers in
the Excel 10 product line. They cover a wide range of control
applications including radiators, induction units, and fan coil
units with manual fan switching, and are suitable for either
wall mounting or unit mounting. The controllers can operate
as stand-alone units or networked using the standard
Echelon L
range of actuator types. Heating systems can be water or
electric, and cooling systems can be chilled water supply or
compressors. Extensive timing and interlock features make
the W7762 especially suitable for systems using electric heat
and compressors.

ONWORKS bus. Interfaces are provided for a wide

Table 2. Hydronic Controller models.

Model Inputs Control

Outputs

W7762A 2 2 X

W7762B 2 2

DESCRIPTION

The W7762A and B are LONMARK compliant Hydronic
Controllers in the Excel 10 family product line. These
controllers provide room temperature control using different
heating and cooling sequences. The controller is provided
with default configuration settings from the factory and is fully
operable on installation. Using standard Echelon
configuration tools, the controller can be configured with job­specific settings. A variety of optional wall modules interface
with the Hydronic Controllers and provide any or all of the
following: setpoint adjustment, and an occupancy bypass
button. All wall modules include a space temperature sensor;
however, a remote C7068A return air sensor can also be
used.

Table 1. Supported output types.

Output Options

Heating Floating, thermal, PWM, on/off, multi-

Cooling Floating, thermal, PWM, on/off, multi-

Setpoint
knob

Internal
Sensor

stage electric.

stage compressor.

Bypass
Button

® U.S. Registered Trademark
Copyright © 1999 Honeywell Inc.
All Rights Reserved

74- 2934- 2

W7762A,B HYDRONIC CONTROLLERS

Sequences

Heat and cool sequences can be selected to be active or not
active, giving a total of four different sequence options:

- Heat only

- Cool only

- Heat/cool changeover

- Heat and cool sequence

Fig. 1. Operational sequence.

Window open

If the controller is configured for window open detection, the
controller automatically disables heat and cool control until
the window is closed again. Frost protection remains active.

Frost protection

If the temperature drops below 46°F (8°C), the controller
enables the heating circuit as frost protection.

Fan fail

When configured with an airflow detector, the controller
protects equipment by disabling the system when the fan
fails (for fan coil units with manual fan speed control).

Changeover

The controller operates two-pipe units configured with a
changeover input.

W7762B HYDRONIC

CONTROLLER

WINDOW

CONTACT

WALL MODULE

WITH TEMP

SENSOR

Modes of Operation

The controller has the following modes of operation.

Occupied mode

This is the normal operating condition for a room or zone
when it is occupied. The controller can be switched into this

Fig. 2. Typical application.

mode by a network command, by the room occupancy
sensor, or by a bypass button on the wall module.

SPECIFICATIONS

Standby mode

The standby mode saves energy by reducing heating or
cooling demand during periods where the room is temporarily
unoccupied.

Unoccupied mode

This mode is used for longer unoccupied periods, such as at

Models

The W7762A and W7762B are identical except for the
integral setpoint adjustment knob on the W7762A. The
W7762A can be ordered with setpoint adjustment in °C
absolute or °C relative.

night or during weekends and holidays.

Input/Output

See Table 3.

Table 3. Input/output specifications.

Inputs Function Pin

Number

Digital window/occupancy/changeover/airflow 4 closed ≤400 ohm (1.5 mA), open ≥10k ohm (4.8 V)

1,2

Digital

Override 7 closed ≤400 ohm, open ≥3.3k ohm

Analog Temperature sensor 9 20k ohm NTC (25°C)

1

Analog

Setpoint adjustment 8 10k ohm

Outputs

1

Digital

Override LED 6 0/5 Vdc (I<10 mA)

Triac (2 pairs)3Heat and cool 14,15

17,18

1

Wall module connection only.

2

Wall modules with fan speed switches must not be used.

3

See Table 1 for output type options.

Characteristics

24 Vac, 250 mA max. continuous,
650 mA max. surge (≤30 sec.)

E-BUSE-BUS

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