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75SS-PRC003-EN
Mechanical
Specifications Condensing Units
General
Units shall be assembled on heavy
gauge steel mounting/lifting rails and
shall be weatherproofed. Units shall
include a hermetic scroll or reciprocating
compressor(s), plate fin condenser coil,
fans and motors, controls, and holding
charge of nitrogen. Operating range
shall be between 115°F (46.1°C) and 35°F
(1.7°C) in cooling as standard from the
factory. Units shall be rated in
accordance with ARI Standard 210/240,
340/360 or 365.
Casing
Unit casing shall be constructed of zinc
coated, heavy gauge, galvanized steel.
Exterior surfaces shall be cleaned,
phosphatized, and finished with a
weather-resistant baked enamel finish.
Units surface shall be tested 500 hours
in salt spray test. Units shall have
removable end panels which allow
access to all major components and
controls.
Refrigeration System – Single
Compressor
TTA075A, TTA100A units shall have a
single refrigeration circuit. Each
refrigeration circuit has an integral
subcooling circuit. A refrigeration filter
drier shall be provided as standard. The
units shall have both a liquid line and
suction gas line service valve with gauge
port. TTA075A, TTA100A units shall have
one direct-drive, hermetic scroll
compressor with centrifugal oil pump
providing positive lubrication to moving
parts. Motor shall be suction gas-cooled
and shall have a voltage utilization range
of plus or minus 10 percent of unit
nameplate voltage. Crankcase heater,
discharge line thermostat, and current-
sensitive motor overloads shall be
included for maximum protection. Scroll
type compressor shall provide
inherently low vibration and noise by
having no suction and discharge valves.
External high and low pressure cutout
devices shall be provided. Evaporator
defrost control provided in indoor
blower coil shall prevent compressor
slugging by temporarily interrupting
compressor operation when low
evaporator coil temperatures are
encountered.
Refrigeration System – Dual Compressor
TTA10 0B,TTA125B, TTA155B, TTA200B
units shall have two separate and
independent refrigeration circuits. Each
refrigeration circuit shall have an integral
subcooling circuit. A refrigeration filter
drier shall be provided as standard.
Units shall have both a liquid line and
suction gas line service valve with gauge
port.
TTA100B,TTA125B, units shall have two
Trane direct-drive, hermetic
reciprocating compressors with
centrifugal oil pump and provide
positive lubrication to all moving parts.
Reciprocating compressor shall have
internal spring isolation and sound
muffling to minimize vibration
transmission and noise.
TTA155B, TTA200B units shall have two
Trane direct-drive, hermetic scroll
compressors with centrifugal oil pump
and provide positive lubrication to all
moving parts. Motor shall be suction
gas-cooled and shall have a voltage
utilization range of plus or minus 10
percent of nameplate voltage. Crankcase
heater, discharge line thermostat, and
current-sensitive motor overloads shall
be included for maximum protection.
Scroll compressor shall provide
inherently low vibration and noise by
having no suction and discharge valves.
External high and low pressure cutout
devices shall be provided. Evaporator
defrost control provided in indoor
blower coil shall prevent compressor
slugging by temporarily interrupting
compressor operation when low
evaporator coil temperatures are
encountered.
Refrigeration System — Dual
Manifolded Compressors
TTA 100C and TTA155C units shall have
a single refrigeration circuit with an
integral subcooling circuit. A
refrigeration filter drier shall be
provided as standard. Units shall have
both a liquid line and suction gas line
service valve with gauge port.
The units shall have two scroll
compressors manifolded together.
Motor shall be suction gas-cooled and
shall have a voltage utilization range of
plus or minus 10 percent of nameplate
voltage. Crankcase heater, discharge
line thermostat, and current-sensitive
motor overloads shall be included for
maximum protection. Scroll type
compressor shall provide inherently
low vibration and noise by having no
suction and discharge valves. External
high and low pressure cutout devices
shall be provided. Evaporator defrost
control provided in the indoor blower
coil shall prevent compressor slugging
by temporarily interrupting
compressor operation when low
evaporator coil temperatures are
encountered.
Condenser Coil
Coils shall be internally finned or
smooth bore
3
/8” (10 mm) copper tubes
mechanically bonded to a configured
aluminum plate fin as standard. Coil
shall be factory pressure and leak
tested to 420 psig (2,899 kPa) air
pressure. Metal grilles with PVC
coating for coil protection is optional.
Condenser Fan And Motor(s)
Direct-drive, statically and dynamically
balanced, 26 or 28-inch (660 or 711
mm) propeller fan(s) with aluminum
blades and electro- coated steel hubs
shall be used in draw-thru vertical
discharge position. Either permanently
lubricated totally enclosed or open
construction motors shall be provided
and shall have built-in current and
thermal overload protection. Motor(s)
shall have be either ball or sleeve
bearing type.