Honeywell W7762A, W7762B INSTALLATION INSTRUCTIONS

BEFORE INSTALLATION

The Excel 10 Hydronic Controller is available in the following
two models:

1. W7762A—with integral setpoint adjustment.

2. W7762B—no integral setpoint adjustment.

Excel 10

W7762A,B HYDRONIC CONTROLLERS

INSTALLATION INSTRUCTIONS

Wiring

All wiring must comply with applicable electrical codes and
ordinances. Refer to job or manufacturers’ drawings for
details.

The models all have similar housings and mounting
procedures.

IMPORTANT

It is recommended that devices be kept at room
temperature for at least 24 hours before applying
power to allow any condensation resulting from low
shipping/storage temperatures to evaporate.

INSTALLATION

W7762 Hydronic Controllers can be mounted on a panel or
wall or onto a standard 60-mm wall outlet box using No. 6
(3.5 mm) screws. See Fig. 1 for outside dimensions and
Fig. 2 for subbase mounting dimensions.

The controller can be mounted in any orientation desired.

Power

Input power provided must be 24 Vac (±20%), 50 or 60 Hz.
For US installation, power must come from an energy-limited
Class II Power Source (transformers must not exceed
100 VA). More than one W7762 Controller can be powered
by a single transformer.

CAUTION

Turn off power prior to connecting to or removing
connections from any terminals to avoid electrical
shock or equipment damage.

Use the heaviest gauge wire available, up to 14 AWG
(2.5 mm
wiring.

2)

with a minimum of 18 AWG (1.0 mm2) for all power

1-13/16 (46)

® U.S. Registered Trademark
Copyright © 2000 Honeywell Inc.
All Rights Reserved

4-9/16 (116)

Fig. 1. Excel 10 Hydronic Controller outside dimensions in in. (mm).

3-3/8

(86)

95- 7563- 3

W7762A,B HYDRONIC CONTROLLERS

ONIC CO

Fig. 2. Subbase mounting dimensions.

IMPORTANT (US only)

If the W7762 Controller is used on UL 1995 Heating
and Cooling Equipment and the transformer

primary power is more than 150 Vac, connect the
transformer’s secondary to earth ground. For these
applications, only one Excel 10 controller can be
powered by each transformer.

Communications

Wire the controller communications E-Bus using 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. When possible, use
Honeywell AK3781, AK3782, AK3791, or AK3792 cable (US
part numbers). See E-Bus Wiring Practices, form number
74-2865, for more information including maximum lengths.

Pull the cable to each controller on the E-Bus and connect to
terminals 19 and 20.

The W7762 Hydronic Controller utilizes a free topology trans­ceiver (FTT10A) Link Power compatible E-Bus that allows
daisy-chain, loop, and star network configurations or any
combination thereof. Depending upon the E-Bus con­figuration used, one or two termination modules, part number
209541B, may be required. Different connections to the
termination module are necessary depending upon whether it
is used in a singly- or doubly-terminated network con­figuration. See Excel 10 FTT/LPT 209541B Termination
Module Installation Instructions, form 95-7554.

NOTES:

— The E-Bus is insensitive to polarity, eliminating

installation errors due to miswiring.

— Do not bundle output wires with sensor, digital input or

communications bus wires. Maintain a minimum 3-in.
(76-mm) separation between E-Bus and Triac output and
power supply wiring.

— For installations, try to avoid areas of high electro-

magnetic noise (EMI).

— Some T7770 Wall Modules used with Hydronic con-

trollers have a daisy-chain connection for the E-Bus to
provide network access via built-in jack.

— For more information; see E-Bus Wiring Guidelines, form

number 74-2865.

Wall Modules

A variety of Excel 10 wall modules can be used with W7762
Hydronic Controllers. See T7460 Wall Modules Installation
Instructions, form number 95-7610; T7560 Digital Wall
Module Installation Instructions, form number 95-7620; and
T7770 Wall Modules Installation Instructions, form number
95-7538 for installation details.

NOTE: Wall Modules with fan speed switches must not be

used with W7762 controllers.

W7762 HYDRONIC CONTROLLER

19
20

Fig. 3. Termination module connection (daisy-chain network configuration).

95-7563-3 2

W7762 HYDR

NTROLLER

ORANGE

19
20

BROWN

TERMINATION
MODULE (209541B)