76
SS-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 reciprocating compressor(s),
plate fin condenser coil(s), fan(s) and
motor(s), control(s), and holding charge
of nitrogen. Operating range shall be
between 115°F (46.1°C) and 50°F (10°C)
in cooling as standard from the factory.
Units shall be rated in accordance with
ARI Standard 340/360 or 365.
Casing
Unit casing shall be constructed of 18
gauge zinc coated, heavy gauge,
galvanized steel. Exterior surfaces shall
be cleaned, phosphatized, and finished
with a weather-resistant baked enamel
finish. The surface of the unit 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
TTA075, TTA100 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
TTA100B,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,TTA125, 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.
General
Units shall be assembled on heavy
gauge steel mounting/lifting rails and
shall be weather proofed. Units shall
include hermetic scroll compressors,
plate fin condenser coils, fans and
motors, controls and holding charge of
nitrogen. Operating range shall be
between 115°F and 50°F in cooling as
standard from the factory. Units shall be
UL 1995 listed, certified and rated in
accordance with ARI Standard 340/360
or 365.
Casing
Unit casing shall be constructed of 18
gauge 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
TTA075A, TTA100A 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,
internal temperature 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
TTA100B,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, TTA155B, and
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, internal temperature
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, TTA155C and TTA200F 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, internal
temperature 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 3/8"
copper tubes mechanically bonded to
configured aluminum plate fin as
standard. Factory pressure and leak
tested to 660 psig. Metal grilles with PVC
coating for coil protection are optional.
Condenser Fan And Motor(s)
Direct-drive, statically and dynamically
balanced 26 or 28 inch propeller fan(s)
shall be used in draw-through 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 be either ball or sleeve bearing
type.
