User manual

9
ELECTRICAL WIRING
HIGH VOLTAGE!
D
ISCONNECT ALL POWER BEFORE SERVICING OR
INSTALLING THIS UNIT . M ULTIPLE POWER SOURCES MAY
BE PRESENT . F AILURE TO DO SO MAY CAUSE PROPERTY
DAMAGE , PERSONAL INJURY OR DEATH .
WARNING
HIGH VOLTAGE!
T
O AVOID PERSONAL INJURY OR DEATH DUE TO
ELECTRICAL SHOCK , DO NOT TAMPER WITH FACTORY
WIRING . T HE INTERNAL POWER AND CONTROL WIRING
OF THESE UNITS ARE FACTORY - INSTALLED AND HAVE
BEEN THOROUGHLY TESTED PRIOR TO SHIPMENT .
C
ONTACT YOUR LOCAL REPRESENTATIVE IF
ASSISTANCE IS REQUIRED .
WARNING
T O PREVENT DAMAGE TO THE WIRING , PROTECT WIRING FROM
SHARP EDGES . F OLLOW NATIONAL ELECTRICAL CODE AND ALL
LOCAL CODES AND ORDINANCES . D O NOT ROUTE WIRES THROUGH
REMOVABLE ACCESS PANELS .
CAUTION
C ONDUIT AND FITTINGS MUST BE WEATHER - TIGHT TO PREVENT
WATER ENTRY INTO THE BUILDING .
CAUTION
For unit protection, use a fuse or HACR circuit breaker that is
in excess of the circuit ampacity, but less than or equal to the
maximum overcurrent protection device. DO NOT EXCEED
THE MAXIMUM OVERCURRENT DEVICE SIZE SHOWN
ON UNIT DATA PLATE.
All line voltage connections must be made through weather-
proof fittings. All exterior power supply and ground wiring
must be in approved weatherproof conduit.
The main power supply wiring to the unit and low voltage
wiring to accessory controls must be done in accordance with
these instructions, the latest edition of the National Electriacl
Code (ANSI/NFPA 70), and all local codes and ordinances.
All field wiring shall conform with the temperature limitations
for Type T wire (63°F/35°C rise).
The main power supply for the CPG036XXX3,4,7 through
CPG072 shall be three-phase, three wire. The power sup-
ply for the CPG036XXX1 through CPG060 shall be single-
phase, two wire. The unit is factory wired for the voltage shown
on the unit’s data plate.
NOTE: If supply voltage is 208V, lead on primary of trans-
former TRANS1 must be moved from the 230V to the 208V
tap.
Main power wiring should be sized for the minimum wire
ampacity shown on the unit’s database. Size wires in accor-
dance with the ampacity tables in Article 310 of the National
Electrical Code. If long wires are required, it may be neces-
sary to increase the wire size to prevent excessive voltage
drop. Wires should be sized for a maximum of 3% voltage
drop.
CAUTION
T
O AVOID PROPERTY DAMAGE OR PERSONAL INJURY DUE TO FIRE, USE
ONLY COPPER CONDUCTORS.
CAUTION
T
O PREVENT IMPROPER AND DANGEROUS OPERATION DUE TO WIRING ERRORS,
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CONTROLS.
V
ERIFY PROPER OPERATION AFTER SERVICING.
NOTE: A weather-tight disconnect switch, properly sized for
the unit total load, must be field installed. An external field
supplied disconnect may be mounted on the exterior panel.
Ensure the data plate is not covered by the field-supplied
disconnect switch.
• Some disconnect switches are not fused. Protect the
power leads at the point of distribution in accordance
with the unit data plate.
• The unit must be electrically grounded in accordance
with local codes or, in the absence of local codes,
with the latest edition of the National Electrical Code
(ANSI-NFPA 70). A ground lug is provided for this
purpose. Size grounding conductor in accordance
with Table 250-95 of the National Electrical Code. Do
not use the ground lug for connecting a neutral
conductor.
• Connect power wiring to the compressor contactor
closest to the entrance located within the main control
box.
LOW VOLTAGE
BLOCK
MAIN POWER
LOW VOLTAGE
ENTRANCE
POWER THRU
THE CURB
Power and Low Voltage Block Connections
F AILURE OF UNIT DUE TO OPERATION ON IMPROPER LINE VOLTAGE
OR WITH EXCESSIVE PHASE UNBALANCE CONSTITUTES PRODUCT
ABUSE AND WILL VOID YOUR WARRANTY AND MAY CAUSE SEVERE
DAMAGE TO THE UNIT ELECTRICAL COMPONENTS .
WARNING