![background image](http://html1.mh-extra.com/html/daikin/dbg-series/dbg-series_general-information-manual_4197507009.webp)
9
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-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 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, 230V Gas
Packs, and 2 Speed
Models.
Line voltage connects
to middle contactor
on 460v and 575v
Gas Packs
(or power block
if equipped)
Power Block -
(Coolers, 230V Gas
Packs, and 2 Speed
Models)
Field wiring enters
from this direction
POWER AND LOW VOLTAGE BLOCK LOCATIONS
R
co
ntrol
wiring
th
ro
ugh
gromme
t
co
ntrol
wiring
Field
fo
r
lin
ev oltage
Gr
ound Lug
Field wiring
ente
rs
f
ro
m
LOW
HIGH
25 TONS MODEL POWER AND LOW VOLTAGE BLOCK LOCATIONS
NOTE:
Depending on the options installed, the location of the components
may vary in some models.
F
AILURE
OF
UNIT
DUE
TO
OPERATION
ON
IMPROPER
LINE
VOLTAGE
OR
WITH
EXCESSIVE
PHASE
UNBALANCE
CONSTITUTES
PRODUCT
ABUSE
AND
IS
NOT
COVERED
BY
THE
WARRANTY
. I
T
MAY
CAUSE
SEVERE
DAMAGE
TO
THE
UNIT
ELECTRICAL
COMPONENTS
.
WARNING
Areas Without Convenience Outlet
It is recommended that an independent 115V power source be
brought to the vicinity of the roof top unit for portable lights and
tools used by the service mechanic.
NOTE:
Refer to local codes for requirements. These outlets can
also be factory installed.
Units installed on Roof Tops
Main power and low voltage wiring may enter the unit through
the side or through the roof curb. Install conduit connectors at the
desired entrance locations. External connectors must be weath-
erproof. All holes in the unit base must be sealed (including those
around conduit nuts) to prevent water leakage into building. All
required conduit and fittings are to be field supplied.
Supply voltage to roof top unit must not vary by more than 10% of
the value indicated on the unit data plate. Phase voltage unbal-
ance must not exceed 2%. Contact your local power company for
correction of improper voltage or phase unbalance.