Daikin DBG Series Service Instructions Manual page 8

PRODUCT DESIGN
Route field
control wiring
through
grommet
LOW
Field wiring
enters from
this direc�on
HIGH
Ground Lug
25 TON POWER AND LOW VOLTAGE BLOCK LOCATIONS
F
AILURE OF UNIT DUE TO OPERATION ON IMPROPER LINE VOLTAGE OR
WITH EXCESSIVE PHASE UNBALANCE CONSTITUTES PRODUCT ABUSE MAY
CAUSE SEVERE DAMAGE TO THE UNIT ELECTRICAL COMPONENTS
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 weatherproof. All holes in the unit base must be sealed
(including those around conduit nuts) to prevent water leak-
age 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 unbalance must not exceed 2%. Contact your local
power company for correction of improper voltage or phase
unbalance.
8
Field connec�on
for
control wiring
at
terminal block
Field
connec�on
for
line voltage
WARNING
ELECTRICAL ENTRANCE LOCATIONS
Unit is equipped with a Low Voltage Terminal Block and has
Single Point wiring to the contactor.
Low Voltage Control Wiring
1. A 24V thermostat must be installed for unit operation. It
may be purchased with the unit or field -supplied. Ther-
mostats may be programmable or electromechanical as
required.
2. Locate thermostat or remote sensor in the conditioned
space where it will sense average temperature. Do not
locate the device where it may be directly exposed to supply
air, sunlight or other sources of heat. Follow installation
instructions packaged with the thermostat.
3. Use #18 AWG wire for 24V control wiring runs not ex-
ceeding 75 feet. Use #16 AWG wire for 24V control wiring
runs not exceeding 125 feet. Use #14 AWG wire for 24V
control wiring runs not exceeding 200 feet. Low voltage
.
wiring may be National Electrical Code (NEC) Class 2
where permitted by local codes.
4. Route thermostat wires from sub-base terminals to the
unit. Control wiring should enter through the duct panel
(dimple marks entrance location). Connect thermostat
and any accessory wiring to low voltage terminal block
TB1 in the main control box.
NOTE: Field-supplied conduit may need to be installed
depending on unit/curb configuration. Use #18 AWG solid
conductor wire whenever connecting thermostat wires to
terminals on sub-base. DO NOT use larger than #18 AWG
wire. A transition to #18 AWG wire may be required before
entering thermostat sub-base.
NOTE: Refer to unit wiring diagrams for thermostat hookups.