CDHH-SVX003C-EN
61
Note: Graphic labels (shown above) are used for CE
application only.
Important:
• Before servicing, disconnect all power
sources and allow at least 30 minutes for
capacitors to discharge.
• All electrical enclosures—unit or remote—
are IP2X.
For CE units, the convenience outlet in the control panel
requires a suitable adaptor to meet the needs of customers
with different plug requirements.
Control Power Transformer Option
The Control Power Transformer (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
Adaptive Frequency™ Drives (AFDs) or customer-
supplied starters
NOTICE
Component Damage!
Failure to follow instructions below could cause an
electrical short which could result in component
damage.
Remove debris from inside the CPTR option
enclosure panel before turning the power on.
The standard unit-mounted CPTR option shall have an
enclosure with a disconnect and will require customer-
supplied power.
CDHH CenTraVac™ 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 pump motor circuit to be located
together in an enclosure that is unit-mounted. There is
three-phase line power between 380 to 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 120V 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 4kVA transformers
feeds the 120V 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- 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.
Power Supply Wiring
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