Honeywell Thermostat CM900 User Manual download pdf (Page 2)

2 CM900 Wireless - Programmable Room Thermostat

1) Installation Information

As these products communicate using RF technology special care must be taken during installation. The

location of the RF components as well as the building structure may inﬂuence performance of the RF

system. To assure system reliability, please review and apply the information given below.

Within a typical residential building the two products should communicate reliably within a 30m range. It

is important to take into consideration that walls and ceilings will reduce the RF signal. The strength of

the RF signal reaching the Relay Box depends on the number of walls and ceilings separating it from the

room thermostat, as well as the building construction - the diagram below illustrates an example of typical

signal strength reduction. Walls and ceilings reinforced with steel or plasterboard walls lined with metal foil

reduce the RF signal signiﬁcantly more.

Once a position is selected for the room thermostat this can be checked using the RF Communication Test

mode as described in section 2.2.3 Locating the Room Thermostat. If the position is unsuitable the Relay

Box will not respond and an alternative position must be selected.

Typical example of Building Fabric Signal losses

Wall Wall Wall

Ceiling

Max. Signal Length 30 metres

= Signal Strength

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Honeywell Thermostat CM900 User Manual Page 2