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Horstmann CentaurPlus C27 Series 2 Manual

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Fitting the backplate
Once the backplate has been removed
from the packaging please ensure the
programmer is re-sealed to prevent damage
from dust and debris.
The backplate should be fitted with the
wiring terminals located at the top and in a
position that allows a total clearance at last
50mm around the unit.
Direct wall mounting
Offer the backplate to the wall in the position where the programmer is to be mounted,
remembering that the backplate fits to the left hand end of the control. Mark the fixing
positions through the slots on the backplate (fixing centres of 60.3mm), drill and plug the
wall, then secure the backplate in position. The slots in the backplate will compensate for
any misalignments of the fixings.
Wiring box mounting
The backplate may be fitted directly onto a single gang steel flush wiring box complying
with BS4662, using two M3.5 screws. CentaurPlus controls are suitable for mounting
on a flat surface only; they must not be positioned on a surface mounted wall box or on
unearthed metal surfaces.
Electrical connections
All necessary electrical connections should now be made. Flush wiring can enter from the
rear through the aperture in the backplate. Surface wiring can only enter from beneath the
programmer and must be securely clamped. The mains supply terminals are intended to
be connected to the supply by means of fixed wiring. Recommended cable sizes are 1.00
or 1.5mm2
CentaurPlus programmers are double insulated and do not require an earth connection but
an earth connection is provided on the backplate for terminating cable earth connectors.
Earth continuity must be maintained and all bare earth connectors must be sleeved.
Ensure no earth conductors are left protruding outside the central space enclosed by the
backplate.
Internal wiring diagram -
C21 & C27 Series 2
The CentaurPlus has voltage free contacts.
A link L - 2 is required for
mains voltage applications
2


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