Bryant LEGACY 580J - Manual (Page 57)

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e. Compressors shall be protected from an over--temperature and over--amperage conditions by an internal, motor
overload device.
f. Compressor shall be factory mounted on rubber grommets.
g. Compressor motors shall have internal line break thermal, current overload and high pressure differential pro-
tection.
h. Crankcase heaters shall not be required for normal operating range, unless provided by the factory.
23 81 19.13.L. Filter Section
1. Filters access is specified in the unit cabinet section of this specification.
2. Filters shall be held in place by a preformed, slide--out filter tray, facilitating easy removal and installation.
3. Shall consist of factory--installed, low velocity, throw--away 2--in. thick fiberglass filters.
4. Filters shall be standard, commercially available sizes.
5. Only one size filter per unit is allowed.
6. 4--in filter capability is possible with a field installed pre engineered slide out filter track accessory. 4--in filters are
field furnished.
23 81 19.13.M. Evaporator Fan and Motor
1. Evaporator fan motor:
a. Shall have inherent automatic--reset thermal overload protection or circuit breaker.
b. 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 and belt break protection system.
b. Shall use rigid pillow block bearing system with lubricant fittings at accessible bearing or lubrication line.
c. Blower fan shall be double--inlet type with forward--curved blades.
d. Shall be constructed from steel with a corrosion resistant finish and dynamically balanced.
e. Standard on all 17--28 models.
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 shaft--down design.
2. Condenser Fans:
a. Shall be a direct--driven propeller type fan.
b. Shall have aluminum blades riveted to corrosion--resistant steel spiders and shall be dynamically balanced.
23 81 19.13.O. Special Features Options and Accessories
1. Integrated Economizers:
a. Integrated, gear--driven opposing blade design type capable of simultaneous economizer and compressor oper-
ation.
b. Independent modules for vertical or horizontal return configurations shall be available. Vertical and horizontal
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 low--leakage dampers, not to exceed 2% leakage at 1 in. wg pressure differential.
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 loss--of--power situations with spring return built into motor.
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%.
580J