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21. 01. 21. Document Number 671661
Nuaire | Western Industrial Estate | Caerphilly | CF83 1NA | nuaire.co.uk
XBC 75 & 85 (ES / BC Control)
Installation Manual
9.2 Basic Control (BC) Units
The Basic (BC) Control units described in this manual are supplied
without any controls. It is the installer’s responsibility to select and
install suitable controller(s) and circuit(s) to produce the desired output
from the units while remaining within the units safe performance
envelope.
•
Any electric heater must be connected to a suitable control
circuit with adequate safety interlock to fan operation.
Including an over temperature safety device rated at 80°C
maximum. The fans should remain running for at least 4
minutes after the electric element is turned off to ensure the
unit does not overheat.
•
Do not wire power supply directly into the heating elements.
A control circuit such as a thyristor controller must be used to
regulate heater power.
•
The alarm relay on condensate may require the use of a contactor
if the host equipment supply is switched.
•
Do not wire the power supply to motor via the motor alarm relay
as terminals are only closed after the motor is energized.
•
Any heating or cooling coils fitted are supplied without control
valve and actuator.
The wiring illustrations below are for the fans, bypass damper and
electric heater XBC units with basic control. All wiring is terminated in
junction boxes fitted to the unit.
9.2.1 Wiring - BC Control
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Wiring - BC Control
