41
CONTROLS
Central Point Wiring (CPW)
Central Point Wiring is an advanced control integration
technique that provides complete boiler diagnostic
capability and greatly simplifies troubleshooting. At the
heart of CPW is the Operations Status Center, which
is comprised of two different circuit boards: the CPW
board and one or more U-2 Diagnostic Boards.
The CPW Board
The Central Point Wiring (CPW) board serves as the
central tie point for connecting all other control compo-
nents in the boiler. The CPW board provides boiler
operating status and fault indication using eight LEDs
which function as described in Table S.
In addition to monitoring and displaying boiler status,
the CPW board controls the timing of various operat-
ing functions including: boiler pump turn-off delay,
blower fan pre-purge, and blower fan post-purge. The
location of each user adjustable timing is shown in
Figure 30.
WARNING: Installation, adjustment and service of
boiler controls including timing of various operating
functions must be performed by a qualified installer
or service agency. Failure to do so may result in
control damage, boiler malfunction, property
damage, personal injury, or death.
WARNING: Turn off the power to the boiler before
installation, adjustment or service of the Central
Point Wiring board or any boiler controls. Failure to
do so may result in board damage, boiler
malfunction, property damage, personal injury, or
death.
CAUTION: This appliance has provisions to be
connected to more than one (1) supply source. To
reduce the risk of electric shock, disconnect all such
connections before servicing.
CAUTION: Risk of electric shock. More than one
(1) disconnect switch may be required to de-
energize the equipment before servicing.
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