Mechanical Specifications; Casing; Compressors; Gas Heating Section - Trane Voyager Manual

General
Units shall be dedicated downflow or
horizontal airflow. Operating range
shall be between 115 F and 0 F
cooling as standard from the factory
for all units. Cooling performance shall
be rated in accordance with DOE and/
or ARI testing procedures. All units
shall be factory assembled, internally
wired, fully charged with R-22 and 100
percent run-tested before leaving the
factory. Wiring internal to the unit shall
be colored and numbered for simpli-
fied identification. Units shall be UL
listed and labeled, classified in
accordance to ANSIZ21.47 for gas
fired central furnaces and UL 1995/
CAN/CSA No. 236-M90 for central
cooling air conditioners. Canadian
units shall be CSA certified.

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. Unit's surface shall be
tested 500 hours in a salt spray test in
compliance with ASTM B117. Cabinet
construction shall allow for all mainte-
nance on one side of the unit. Service
panels shall have lifting handles and
be removed and reinstalled by
removing only a single fastener on the
3-7½ ton units and not more than
three screws on the 8½-25 ton units
while providing a water and air tight
seal. The downflow unit's base pan
shall have no penetrations within the
perimeter of the curb other than the
1
raised 1 / " high supply/return open-
8
ings to provide an added water
integrity precaution, if the condensate
drain backs up. The base of the unit
shall have provisions for forklift and
crane lifting.
Unit Top
The top cover shall be one piece or
where seams exist, it shall be double
hemmed and gasket sealed to prevent
water leakage.
Mechanical
Specifications
Filters
One inch, throwaway filters shall be
standard on all 3-7½ ton units. Filter
rack can be converted to two inch
capability. Two inch filters shall be
factory supplied on all units above 7½
tons.

Compressors

All 3-17½ ton standard, 3-7½ ton high
efficiency, and 10 ton high efficiency
units shall have direct-drive hermetic,
reciprocating type compressors with a
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. Shall have
internal spring isolation and sound
muffling to minimize vibration trans-
mission and noise. External high
pressure cutout shall be provided on
15 and 17½ ton standard models. Low
pressure switches shall be standard.
8½, 12½, and 17½ ton high efficiency
units, and all 20 and 25 ton units, shall
have direct-drive, hermetic, scroll type
compressors with centrifugal type oil
pumps. Motor shall be suction gas-
cooled and shall have a voltage
utilization range of plus or minus 10
percent of unit nameplate voltage.
Shall have internal spring isolation
and sound muffling to minimize
vibration transmission and noise.
Winding temperature limits and
compressor overloads shall be
provided with the Trane 3D® Scroll.
The Copeland scrolls used on the
12½ and 17½ ton high efficiency units
have crankcase heaters. The 15 ton
high efficiency unit contains both a
reciprocating type compressor and a
scroll type compressor; thus, all
compressor information provided
applies to this model.
89
Refrigerant Circuits
Each refrigerant circuit shall have
independent fixed orifice expansion
devices, service pressure ports and
refrigerant line filter driers factory-
installed as standard. An area shall
be provided for replacement suction
line driers.
Refrigerant Circuits
Each refrigerant circuit shall have
independent fixed orifice expansion
devices, service pressure ports and
refrigerant line filter driers factory
installed as standard. An area shall be
provided for replacement suction line
driers.
Evaporator And Condenser Coils
Internally finned 3/8" copper tubes
mechanically bonded to configured
aluminum plate fin shall be standard.
Coils shall be leak tested at the
factory to ensure pressure integrity.
The evaporator coil and condenser
coil shall be leak tested to 200 psig
and pressure tested to 450 psig.

Gas Heating Section

The heating section shall have a drum
and tube heat exchanger design using
corrosion resistant steel components.
A forced combustion blower shall
supply premixed fuel to a single
burner ignited by a pilotless hot
surface ignition system. In order to
provide reliable operation, a negative
pressure gas valve shall be used that
requires blower operation to initiate
gas flow. On an initial call for heat, the
combustion blower shall purge the
heat exchanger 45 seconds before
ignition. After three unsuccessful
ignition attempts, the entire heating
system shall be locked out until
manually reset at the thermostat.
Units shall be suitable for use with
natural gas or propane (field installed
kit) and also comply with California
requirements for low NOx emissions.
Units under 5 tons shall have a single
stage high or low heat option. The 6¼
and 7½ ton units shall have either
single or two stage heating options
and the 8½ through 25 ton units shall
have two stage heating.