Installation – Honeywell cm921 User Manual
Page 6
CM921 CHRONOTHERM
6
EN0H 8557 UK07 R0 09/06
R6660D Relay box
CMT921A Room Unit
a
b
WIRING
The R6660D relay box is designed for fixed wiring only and must be installed in accordance with latest l.E.E. regulations.
Ensure the wiring connection to the supply is via a fuse rated at no more than 10 amps and a Class "A" switch (having
contact separation of at least 3 mm in all poles).
IMPORTANT
1. The installer must be a trained service engineer
2. Disconnect the power supply before beginning installation
INSTALLATION
• The
CM921 is a radio frequency device and for the best performance should be installed in an open space.
•
Leave at least 30cm distance from any metal objects including wall boxes and at least 1 metre from any other electrical equipment
e.g. radio, TV, PC etc.
•
Do not mount onto metal wall boxes.
•
NOTE: It is recommended that the R6660D relay box is installed before commencing with the room unit installation (refer to the
Installation Guide).