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

74-2934-2 2

W7762A,B HYDRONIC CONTROLLERS

Power Supply

24 Vac ± 20%, 50/60 Hz.

Power Consumption

0.5 VA maximum (no load). See Excel 10 Hydronic Controller
System Engineering Guide, form number 74-2935 for
transformer sizing information.

Hardware design

Processor:

Neuron 3150

0.5 Kbyte of EEPROM on chip.

External memory:

EPROM, 64 Kbyte by 8.

Communication Interface:

Echelon transceiver FTT10A.

Compatible to Echelon Link Power Network.
LON service pin accessible on underside of housing.
LON LED visible through air vents on front of housing.

©

running at 5 MHz, with 2 Kbyte of RAM and

Specified Sensing Temperature Range

32° to 158°F (0° to 70°C)

Environmental Ratings

Operating temperature:

32° to 122°F (0° to 50°C)

Shipping/storage temperature:

-4° to 158°F (-20° to 70°C)

Relative humidity:

5% to 95% noncondensing

Dimensions

3-3/8 x 4-9/16 x 1-13/16 in. (86 x 116 x 46 mm)

Communications

The W7762 controllers use free topology transceivers (FTT)
and LonTalk bus protocol for communications. The E-Bus is
insensitive to polarity, eliminating wiring errors during
installation. The E-Bus is Link Power compatible.

The recommended wire size to be used for the E-Bus is level
IV 22 AWG (Belden part number 9D220150) or plenum rated
level IV 22 AWG (Belden part number 9H2201504)
nonshielded, twisted pair, solid conductor wire.

FTT networks can be in bus, star, loop or any combination of
these topologies. See E-Bus Wiring Practices, form number
74-2865, for more information including maximum lengths.

Mounting Options

W7762 Controllers can be mounted directly on a panel or
wall with two screws or it can be mounted with four screws on
a standard 60 mm junction box. The controller can be
mounted in any orientation desired.

LonMark Functional Profile

W7762 Hydronic Controllers support the LonMark Functional
Profile #8020 “Fan Coil Unit Controller”, version 2.0 (see
Fig. 3).

Hardware
Output

Fan Coil Unit Controller
Object #8020

nviSpaceTemp

nv1

SNVT_temp_p

nviSetPoint

nv2

SNVT_temp_p

nviFanSpeedCmd

nv6

SNVT_switch

nviOccCmd

nv7

SNVT_occupancy

nviApplicMode

nv8

SNVT_hvac_mode

nviSetPtOffset

nv9

SNVT_temp_p

nviWaterTemp

nv10

SNVT_temp_p

nviDischAirTemp

nv17

SNVT_temp_p

nviEnergyHoldOff

nv18

SNVT_switch

nviSensorOcc
SNVT_Occupancy

nviEmerg
SNVT_hvac_emerg

nviReheatRelay
SNVT_switch

NOT SUPPORTED.

Mandatory
Network
Var iables

Optional
Network
Variables

Configuration Properties

nc49 - nciSndHrtBt SNVT_time_sec mandatory
nc52 - nciMinOutTm SNVT_time_sec optional
nc48 - nciRcvHrtBt SNVT_time_sec optional
nc17 - nciLocation SNVT_str_asc optional
nc60 - nciSetPnts
nc59 - nciNumValve

SNVT_temp_setpt
SNVT_count

Manufacturer

Defined
Section

Hardware

Input

nvoHeatOutput

nv3

SNVT_lev_percent

nvoCoolOutput

nv4

SNVT_lev_percent

nvoFanSpeed

nv5

SNVT_switch

nvoTerminalLoad

nv11

SNVT_lev_percent

nvoLoadAbs

nv12

SNVT_power

nvoDischAirTemp

nv13

SNVT_temp_p

nvoReheat

nv14

SNVT_switch

nvoSpaceTemp

nv15

SNVT_temp_p

nvoEffectSetPt

nv16

SNVT_temp_p

nvoEffectOcc

nv19

SNVT_occupancy

nvoEnergyHoldOff

nv20

SNVT_switch

nvoUnitStatus

nv21

SNVT_hvac_status

mandatory
optional

nvoSensorOcc
SNVT_occupancy

nvoDigitInState
SNVT_switch

Fig. 3. LonMark object details.

3 74-2934-2

W7762A,B HYDRONIC CONTROLLERS

R

Approvals and Standards

CE
EN50081-1
EN50082-1
meets FCC part 15 class B requirements

OCCUPANCY SENSOR

CHANGEOVER CONTACT

AIRFLOW CONTACT
WINDOW CONTACT

MOTION SENSOR

WALL MODULE
CONNECTIONS

Accessories

Excel 10 T7460 Wall Modules
Excel 10 T7560 Wall Modules
Excel 10 T7770 Wall Modules
Excel 10 FTT/LPT 209541B Termination Module
C7068A Return Air Sensor (Europe only)
M7410C Small Electric Linear Valve Actuator (Europe only)
Z100 Thermoelectric Actuator (Europe only)

W7762 HYDRONIC CONTROLLE

D

T

E

U

O

S

N

1

T

O

2

3

4
5
6

7
8
9

10

N

N

D

D

LED
BYPASS

SETPT
SENSOR
GND

D

E

U

S

O

T

U

S

D

E

T

I

A

G

I

N

I

U

L

P

T

D

N

G

Wall module setpoint connection for W7762B only.

Fig. 4. Input/output details.

24 VAC COM

OUT 1 COM

OUT 1 OPEN

OUT 1 CLOSE

OUT 2 COM

OUT 2 OPEN

OUT 2 CLOSE

E-BUS (LON)
E-BUS (LON)

24 VAC

24 VAC

11

12

13

14

15
16

17
18
19

20

24 VAC COM

COM

OPEN

CLOSE

LONW

L

ONWORKS

HEAT

+

ORKS

NETWORK IN

NETWORK OUT

COM

OPEN

CLOSE

120/240 VAC

COOL

-

Table 3. Output assignments for various actuator types.

Output type Out 1 Terminal Out 2 Terminal

13 14 15 16 17 18

Floating 24 Vac open close 24 Vac open close

1-stage 24 Vac on/off — 24 Vac on/off —

2-stage 24 Vac stage 1 stage 2 24 Vac stage 1 stage 2

3-stage 24 Vac stage 1 stage 2 24 Vac stage 1 stage 2

stage 3 stage 3

PWM 24 Vac PWM — 24 Vac PWM —

Thermal 24 Vac on/off — 24 Vac on/off —

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Honeywell Inc. Honeywell Limited-Honeywell Limitee Honeywell AG
Honeywell Plaza 155 Gordon Baker Road Böblinger Straβe 17
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74-2934-2 Rev. 01-01 printed in Germany Subject to change without notice