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3. Installation
Wiring the Control Unit
Cable Entries
The control unit case back provides several cable entries. The back is
designed to stand away from the wall to leave space for cables.
Mains Connection
The control unit must be permanently connected to a spur outlet fitted with a
readily accessible disconnect device. Connect the mains supply to the control
unit using the 3-way terminal block located in the control unit back. Secure
the mains cable to the case anchor point using the cable tie provided. Note
that the control unit has a T-250mA internal mains fuse. All electrical connec-
tions should be carried out by a qualified electrician and must comply with the
current IEEE Wiring Regulations: 16 Edition, Appendix 5 - Standard Circuit
Arrangement.
To Control Panel
Transformer
L
N
T 250mA 250V
230V ~50Hz 200mA
Figure 9. Mains Connection
Connect the 21VAC lead from the mains transformer to the main pcb.
Caution: Do not apply mains power at this point. Do not work inside the
control unit case when mains power is present.
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