Bryant Legacy Line Series Manual page 51

refrigeration circuit. Each orifice is to be opti-
mized to the coil circuit it serves.
b. Refrigerant filter drier - Solid core design.
c. Service gage connections on suction and dis-
charge lines.
d. Pressure gage access through a specially
designed access port in the top panel of the unit.
2. There shall be gage line access port in the skin of
the rooftop, covered by a black, removable plug.
a. The plug shall be easy to remove and replace.
b. When the plug is removed, the gage access port
shall enable maintenance personnel to route
their pressure gage lines.
c. This gage access port shall facilitate correct and
accurate condenser pressure readings by
enabling the reading with the compressor access
panel on.
d. The plug shall be made of a leak proof, UV-
resistant, composite material.
3. Compressors
a. Unit shall use fully hermetic, scroll compressor
for each independent refrigeration circuit.
b. Compressor motors shall be cooled by refriger-
ant gas passing through motor windings.
c. Compressors shall be internally protected from
high discharge temperature conditions.
d. Compressors shall be protected from an over-
temperature and over-amperage conditions by
an internal motor overload device.
e. Compressor shall be factory mounted on rubber
grommets.
f. Compressor motors shall have internal line
break thermal, current overload and high pres-
sure differential protection.
g. Crankcase heaters shall not be required for nor-
mal operating range, unless required by com-
pressor manufacturer due to refrigerant charge
limits.
K. (23 81 19.13.K) Filter Section
1. Filter access is specified in the unit cabinet section
of this specification.
2. Filters shall be held in place by a pivoting 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.
L. (23 81 19.13.L) Evaporator Fan and Motor
1. Evaporator fan motor:
a. Shall have permanently lubricated bearings.
b. Shall have inherent automatic-reset thermal
overload protection or circuit breaker.
c. Shall have a maximum continuous bhp rating
for continuous duty operation; no safety factors
above that rating shall be required.
2. Direct Drive ECM X13 - Evaporator Fan Standard:
a. Multi-speed motor with easy quick adjustment
settings.
b. Blower fan shall be double-inlet type with for-
ward-curved blades.
c. Shall be constructed from steel with a corrosion
resistant finish and dynamically balanced.
3. Belt-driven Evaporator Fan Factory Optional:
a. Belt drive shall include an adjustable pitch
motor pulley.
b. Shall use sealed, permanently lubricated ball-
bearing type.
c. Blower fan shall be double-inlet type with for-
ward-curved blades.
d. Shall be constructed from steel with a corrosion
resistant finish and dynamically balanced.
M. (23 81 19.13.M) 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 on all sizes.
2. Condenser Fans:
a. Shall be a direct-driven propeller type fan.
b. Shall have galvalum blades riveted to corro-
sion-resistant steel spiders and shall be dynami-
cally balanced.
N. (23 81 19.13.N) Special Features Options and Accessories
1. Integrated EconoMi$er IV, EconoMi$er2, and
EconoMi$er X standard leak rate models. (Factory-
installed on 3-phase models only. Field-installed on
all 3 and 1 phase models)
a. Integrated, gear driven opposing modulating
blade design type capable of simultaneous
economizer and compressor operation.
b. Independent modules for vertical or horizontal
return configuration 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 pro-
vide free cooling with outdoor air when tem-
perature and/or humidity are below set points.
e. Shall be equipped with gear driven dampers for
both the outdoor ventilation air and the return
air for positive air stream control.
f. Standard leak rate shall be equipped with damp-
ers not to exceed 2% leakage at 1-in. wg pres-
sure differential.
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