Daikin DBC Series Installation Instructions Manual page 9

25 TON DDC POWER AND LOW VOLTAGE TERMINAL 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 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.
U R T
NITS INSTALLED ON OOF OPS
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 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's data plate. Phase voltage
unbalance must not exceed 2%. Contact your local power company
for correction of improper voltage or phase unbalance.
WARNING
ELECTRICAL ENTRANCE LOCATIONS
Unit is equipped with Single Point Power Block and Low Voltage
Block.
L V C W
OW OLTAGE ONTROL
NOTE: For models equipped with the DDC controls option, refer to
the supplemental DDC literature supplied with the unit for
additional information.
1. A 24V thermostat must be installed for unit operation. It
may be purchased with the unit or field -supplied.
Thermostats 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
exceeding 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.
9
IRING