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PRODUCT DESIGN
7
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 weath-
erproof 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 Electrical
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 shall be three-phase, three wire.
The unit is factory wired for the voltage shown on the unit’s
data plate.
NOTE:
If supply voltage is 208V, all leads 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 necessary
to increase the wire size to prevent excessive voltage drop.
Wires should be sized for a maximum of 3% voltage drop.
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
.
CAUTION
NOTE:
A weather-tight disconnect switch, properly sized
for the unit total load, must be field or factory 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-NF-
PA 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 electrical middle contactor
within the main control box of power block, if equipped.
Low Voltage
Terminal Strip
Thermostat wiring
for all units
connect to low
voltage strip
Ground
Lug
Line voltage connects
to power block on
Coolers and the 230v
Gas Packs
Line voltage connects
to middle contactor
on 460v and 575v
Gas Packs
(or power block
if equipped)
Power Block
(Coolers &
230V Gas Packs
Only)
Field wiring enters
from this direction
POWER AND LOW VOLTAGE BLOCK LOCATIONS
Содержание DBG Series
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Страница 52: ...ACCESSORIES 52 GAS ELECTRIC...
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Страница 54: ...ACCESSORIES 54...
Страница 95: ...95 DBC COMMERCIAL 15 25 Ton Packaged Air Conditioner Unit WIRING DIAGRAMS...
Страница 100: ...100 DBG COMMERCIAL 15 25 Ton Packaged Gas Electric Unit WIRING DIAGRAMS...