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c.Shall have a maximum continuous bhp rating for continuous duty operation; no safety factors above that rating shall be required.
2.Belt-driven Evaporator Fan:
a.Belt drive shall include an adjustable pitch motor pulley.
b.Shall use sealed, permanently lubricated
c.Blower fan shall be
d.Shall be constructed from steel with a corrosion resistant finish and dynamically balanced.
23 81 19.13.N. Condenser Fans and Motors
1.Condenser fan motors:
a.Shall be a totally enclosed motor.
b.Shall use permanently lubricated bearings.
c.Shall have inherent thermal overload protection with an automatic reset feature.
d.Shall use a
2.Condenser Fans:
a.Shall be a
b.Shall have aluminum blades riveted to
1.Integrated Economizers:
a.Integrated,
b.Independent modules for vertical or horizontal return configurations shall be available. Vertical return modules shall be available as a factory installed option.
c.Damper blades shall be galvanized steel with composite gears. Plastic or composite blades on intake or return shall not be acceptable.
d.Shall include all hardware and controls to provide free cooling with outdoor air when temperature and/or hu- midity are below setpoints.
e.Shall be equipped with gear driven dampers for both the outdoor ventilation air and the return air for positive air stream control.
f.Shall be equipped with
g.Shall be capable of introducing up to 100% outdoor air.
h.Shall be equipped with a barometric relief damper capable of relieving up to 100% return air.
i.Shall be designed to close damper(s) during
j.Dry bulb outdoor air temperature sensor shall be provided as standard. Outdoor air sensor setpoint shall be adjustable and shall range from 40 to 100_F / 4 to 38_C. Additional sensor options shall be available as ac- cessories.
k.The economizer controller shall also provide control of an accessory power exhaust unit function. Factory set at 100%, with a range of 0% to 100%.
l.The economizer shall maintain minimum airflow into the building during occupied period and provide design ventilation rate for full occupancy. A remote potentiometer may be used to override the damper setpoint.
m.Dampers shall be completely closed when the unit is in the unoccupied mode.
n.Economizer controller shall accept a
o.Compressor lockout sensor shall open at 35_F (2_C) and close closes at 50_F (10_C).
p.Actuator shall be direct coupled to economizer gear. No linkage arms or control rods shall be acceptable.
q.Economizer controller shall provide indications when in free cooling mode, in the DCV mode, or the exhaust fan contact is closed.
2.
a.Damper shall be a
b.Damper shall include adjustable damper travel from 25% to 100% (full open).
c.Damper shall include single or dual blade, gear driven dampers and actuator motor.
d.Actuator shall be direct coupled to damper gear. No linkage arms or control rods shall be acceptable.
e.Damper will admit up to 100% outdoor air for applicable rooftop units.
f.Damper shall close upon indoor (evaporator) fan shutoff and/or loss of power.
g.The damper actuator shall plug into the rooftop unit’s wiring harness plug. No hard wiring shall be required.
h.Outside air hood shall include aluminum water entrainment filter.
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