Honeywell Thermostat CM900 User Manual download pdf (Page 3)

Installation Guide 3

2) Installing the CM900 Wireless System

Please follow the illustrations and information below in sequence to install the Relay Box and room

thermostat correctly. For applications other than gas boilers, enabling special features and to see what

other system options are available refer to section 4) Installer Mode.

2.1 Installing the Relay Box

The Relay Box is a RF device. For the

best performance install in an open

space. Leave at least 30cm distance

from any metal objects including wall

boxes and boiler housing.

Do not mount on metal wall boxes.

EMC compliance considerations

Keep AC mains supply/load cables

separate from signal wiring.

Refer to Code of Practice standards

EN61000-5-1 and -2 for guidance.

NOTE: The Relay Box contains

no user serviceable parts. It

should be opened and installed

by qualified installer only.

WARNING: Electrostatic sensi-

tive device! Do not touch the

circuit board.

NOTE: All wiring must be in accordance with IEE regulations

CAUTION: Observe ambient temperature and current limits

(see the Relay Box wiring label)

Burner (direct control)

Zone valve Cooling device

2 3

< 7mm Ø

> 7mm Ø

1.5-2.5mm²

6mm max.

Combi boiler

230V

50-60Hz

BDR91

A-B:5(3)A

A-C:5(3)A

BDR91

A-B:5(3)A

A-C:5(3)A

230V

50-60Hz

V4043H

BDR91

A-B:5(3)A

A-C:5(3)A

230V

50-60Hz

BDR91

A-B:5(3)A

A-C:5(3)A

230V

50-60Hz

= M3.5

1 2 3 4 5 6 7 8 ... 11 12

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Honeywell Thermostat CM900 User Manual Page 3

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