22
UNT Controller—Unitary (UNT) Controller
!
CAUTION: Equipment damage hazard. When separate
transformers are used, it is very important to remove
the jumper that otherwise connects the triacs terminal
to 24 VAC (high side) or common (low side). This
prevents possible controller damage.
A separate load transformer may be necessary because of transformer VA
limitations, or may be desirable to completely isolate loads from the UNT
digital circuitry for better noise immunity.
You may connect the UNT110, UNT120, or UNT140 power transformer
secondary directly to earth ground. If you elect to do so, the grounded side
must connect to the common input terminal of the controller.
!
CAUTION: Equipment damage hazard. You may have a
maximum of one single earth ground connection,
which must be at the transformer secondary
common, whether one or multiple controllers are
powered by the same transformer.
When grounding one side of the transformer
secondary, the grounded side must connect to the
common power input terminal.
Connecting the grounded side of the transformer to
the 24 VAC power input terminal will damage a
CBLPRO-1(-0) or laptop.
You may connect the separate load power transformer secondary to earth
ground as long as doing so is compatible with the equipment being
controlled.
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