Honeywell W7752G, W7752F, W7752E, W7752J, W7752D INSTALLATION INSTRUCTIONS

BEFORE INSTALLATION

The Excel 10 Fan Coil Unit (FCU) Controller is available in the following five models:

1.W7752D2007

—230 Vac power with electric reheat relay.

2.W7752E2004

—230 Vac power without electric reheat relay.

3.W7752F2002

—115 Vac power with electric reheat relay.

4.W7752G2000

—115 Vac power without electric reheat relay.

5.W7752J2003

—100 Vac power without electric reheat relay.

The models all have identical 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.

This device must be installed in a UL-listed enclosure offering adequate space to maintain the segregation of line voltage field wiring and Class 2 field wiring (US requirement only).

INSTALLATION

Mount the Fan Coil Unit controllers in locations that allow clearance for wiring. The controllers can be mounted on a

Excel 10

W7752D,E,F,G,J FAN COIL UNIT CONTROLLERS

INSTALLATION INSTRUCTIONS

panel with screws or by snapping onto standard EN 50 022 DIN rail, 1-3/8 by 9/32 in. (35 mm by 7.5 mm). See Fig. 1 for mounting dimensions. See Fig. 2 for DIN rail mounting. The type and length of screw required for screw mounting depends upon the panel material used to mount the controller.

The controller can be mounted either vertically or horizontally. However, if thermal actuators are connected to the controller outputs, it is recommended that the controller be mounted so that the transformer is not located beneath the electronics.

WARNING

ELECTRICAL SHOCK HAZARD.

Source power at terminal block can cause personal injury or death. W7752 FCU Controllers must be mounted inside their respective fan coil unit boxes to prevent access by unauthorized personnel.

To reduce the risk of fire or electric shock, install in a controlled environment relatively free of contaminants.

Wiring

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

Fig. 1. Excel 10 Fan Coil Unit Controller outside and mounting dimensions in in. (mm).

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W7752D,E,F,G,J FAN COIL UNIT CONTROLLERS

Fig. 2. DIN rail mounting.

Power

Input power provided must be 230 Vac (+10%, -15%), 50 or 60 Hz for W7752D and E; 115 Vac (+10%, -15%), 50 or

60 Hz for W7752F and G, and 100 Vac (±6%), 50 or 60 Hz for W7752J.

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 mm2) with a minimum of 18 AWG (1.0 mm2) for all power wiring. Strain relief/support must be provided for power wiring within 2-3/8 in. (60 mm) of controller connection.

IMPORTANT

To comply with CE requirements, with devices having a voltage range of 50 to 1000 Vac or 75 and 1500 Vdc which are not provided with a supply cord and a plug or with other means for disconnection from the supply having a contact separation of at least 3 mm in all poles, the means for disconnection must be incorporated in the fixed wiring.

W7752 FAN COIL UNIT CONTROLLER

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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).

Pull the cable to each controller on the E-Bus and connect to terminals 9 and 10.

The W7752 FCU Controller utilizes a free topology transceiver (FTT10A) E-Bus which 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 singlyor 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 wiring.

—For installations, try to avoid areas of high electromagnetic noise (EMI).

—Some T7770 Wall Modules used for 2000-series FCU controllers 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 W7752 FCU Controllers. See T7460 Wall Modules Installation Instructions (form number 95-7610) and T7560 Digital Wall Module Installation Instructions (form number 95-7620) for installation details.

W7752 FAN COIL UNIT CONTROLLER

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TERMINATION

MODULE

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

EN1B-0250GE51 R0703

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