Daikin DPSA Manual page 33

M. Service Lights
1. Service lights shall be provided throughout the
air handling unit and control panel. Lights shall
be turned on from a single exterior switch on the
exterior of the control panel. The lights will remain
powered when the unit disconnect is OFF.
2. Service light enclosures shall have a minimum IP
rating of 65 meaning the lights are dust tight and
protected against jets of water. The light bulbs
provided are a light-emitting diode (LED) type to
minimize amperage draw and shall produce 1100
lumens in a warm white color.
N. Burglar Bars
1. A combination burglar bar shall be provided in the
bottom supply air opening. Burglar bar shall be
made of 3/4" diameter ground and polished steel
shaft welded to a galvanized steel frame.
O. Isolation Damper
1. Isolation dampers shall be provided in the bottom
supply air opening. A two-position actuator shall
be provided to close the dampers when the fans
are not running.
2. Isolation dampers shall be provided in the bottom
return air opening. A two-position actuator shall
be provided to close the dampers when the fans
are not running.
3. Isolation dampers shall be provided in the bottom
supply and return air openings. A two-position
actuator shall be provided to close the dampers
when the fans are not running.
P. Safety Grates
1. Walk on safety grates shall be provided in the
bottom supply air opening and able to support a
concentrated load of 1000lbs at mid-span.
2. Walk on safety grates shall be provide in the
bottom return air opening and able to support a
concentrated load of 1000lbs at mid-span.
3. Walk on safety grates shall be provided in the
bottom supply and return air openings and be
able to support a concentrated load of 1000lbs at
mid-span.
2 .04 Acoustics
A. Equipment sound performance shall meet the
scheduled discharge and return sound power
B. Discharge plenum sections shall be lined with
a perforated acoustic liner to enhance sound
attenuation.
C. Discharge and return plenum sections shall be lined
with a perforated acoustic liner to enhance sound
attenuation.
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2 .05 Supply, Return and Exhaust Fans
A. All supply, return and exhaust fans shall be
configured in an array with a minimum number fans
specified in the schedule for each unit.
B. Redundancy
1. Size all fans for N-1 per the schedule
2. Each supply, exhaust, and return fan motor
shall have an independent integral inverter or a
dedicated variable frequency drive per motor for
redundancy.
3. Provide the supply fan array with a backdraft
damper section to prevent recirculation during
redundant operation
C. All fans shall be dynamically balanced as an
assembly in planes as per DIN / ISO 21940 to
balancing grade G 6.3 or better or provide 2" Spring
isolation for each fan.
D. All fans shall be provided with totally enclosed
maintenance-free ball bearings and permanent
lubrication. Bearings shall be selected for a
minimum life in excess of 350,000 hrs (L50) at
selected operating point.
E. Fan airflow measuring
1. All supply fans shall include a factory installed
flow measuring station. Airflow needs to be
readable through the unit controller and building
automation system.
2. All supply and exhaust fans shall include a
factory installed flow measuring station. Airflow
needs to be readable through the unit controller
and building automation system.
3. All supply and return fans shall include a factory
installed flow measuring station. Airflow needs
to be readable through the unit controller and
building automation system.
E. ECM Supply Fans
1. All fans shall be a single width, single inlet
(SWSI) airfoil centrifugal fan. The fan wheel
shall be Class II construction with aluminum
fan blades that are continuously welded to the
hub plate and end rim. The fan shall be a direct
drive fan mounted to the motor shaft. Belts and
sheaves are not acceptable due to the additional
maintenance.
2. The fan motor shall be a totally enclosed
electrically commutated motor that is speed
controlled by the rooftop unit controller. The
motor shall include thermal overload protection
and protect the motor in the case of excessive
motor temperatures. The motor shall have phase
failure protection and prevent the motor from
operation in the event of a loss of phase. Motors
shall be premium efficiency.
33
General Specification
CAT 258 • REBEL APPLIED ROOFTOP