Power Supply Wiring
54 CVHH-SVX001A-EN
Control Power Transformer (CPTR) Option
The CPTR option provides a means to isolate the incoming
line voltage required for the chiller control circuits and the
oil/refrigerant pump from the compressor incoming line
voltage. The CPTR option provides a solution for
customers that cannot afford to lose communication with
the chiller or extended restart times due to lost incoming
power.
The CPTR option will benefit:
• UPS customers
• Customers requiring fast restarts
• Customers who need controls sourced from a clean
dedicated source
• Customers with building automation/communication
systems who want to maintain chiller status reporting
during power loss
• Chillers with remote-mounted medium-voltage AFDs
or customer-supplied starters
The standard unit-mounted CPTR option shall have an
enclosure with a disconnect and will require customer-
supplied power.
CVHH and CDHH chillers have a low-voltage CPTR option
and a medium-voltage CPTR option.
The CPTR option involves a single phase 4kVA
transformer(s) and the oil pum p motor circuit to be located
together in an enclosure that is unit-mounted. There is
3-phase line power between 380–600 Vac feeding this
enclosure. Wherever the 4kVA transformer is located, the
oil pump motor circuit will be located along with it.
With the CPTR option, the control power transformer(s)
and oil pump motor circuit are NOT inside of the starter.
For the low-voltage CPTR option, the single phase 4kVA
transformer feeds the 120 V control power to all of the
controls. The three-phase line power feeds a motor starter
and overload oil pump motor circuit which feeds the
three-phase oil pump motor.
For the medium-voltage CPTR option, there are two single-
phase 4-kVA transformers: one of the 4 kVA transformers
feeds the 120 V control power to all of the controls. The
second transformer feeds a combination motor controller
oil pump motor circuit which then feeds a single-phase oil
pump motor.
Note: Refer to the unit nameplate for maximum
overcurrent protection and minimum current
ampacity values for connecting to the CPTR option
enclosure.
Service personnel are required to ensure that the
incoming power supply voltage provided by the customer
to the CPTR option enclosure unit-mounted panel is as per
submittal and nameplate.
Power Factor Correction
Capacitors (Optional)
Power factor correction capacitors (PFCCs) are designed to
provide power factor correction for the compressor motor.
PFCCs are available as an option for unit-mounted starters
and remote mounted starters.
Notes:
• Verify PFCC voltage rating is greater than or equal to
the compressor voltage rating stamped on the unit
nameplate.
• Refer to the wiring diagrams that shipped with the unit
for specific PFCC wiring information.
NOTICE:
CPTR Option Enclosure Panel Damage!
Failure to remove debris from inside the CPTR option
enclosure panel could result in an electrical short and
could cause serious component damage.
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