Mechanical Specifications; Casing; Evaporator And Condenser Coils; Gas Heating Section - Trane Voyager TC* User Manual

General
The units shall be dedicated
downflow or horizontal airflow. The
operating range shall be between
115°F and 0°F in cooling as standard
from the factory for all units. Cooling
performance shall be rated in
accordance with ARI testing
procedures. All units shall be factory
assembled, internally wired, fully
charged with R-22, and 100 percent
run tested to check cooling
operation, fan and blower rotation
and control sequence, before leaving
the factory. Wiring internal to the
unit shall be colored and numbered
for simplified identification. Units
shall be UL listed and labeled,
classified in accordance to UL 1995/
CAN/CSA No. 236-M90 for Heat
Pumps. 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 maintenance on one side of the
unit. In order to ensure a water and
air tight seal, service panels shall
have lifting handles and no more
than three screws to remove. All
exposed vertical panels and top
covers in the indoor air section shall
be insulated with a 1/2 inch, 1 pound
density foil-faced, fire-resistant,
permanent, odorless, glass fiber
material. The base of the downflow
unit shall be insulated with 1/2 inch,
1 pound density foil-faced, closed-
cell material. The downflow unit's
base pan shall have no penetrations
within the perimeter of the curb
other than the raised 11/8 inch high
supply/return openings 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.
102

Mechanical Specifications

Unit Top
The top cover shall be one piece, or
where seams exist, double hemmed
and gasket sealed to prevent water
leakage.
Filters
Two inch standard filters shall be
factory supplied on all units.
Optional two inch pleated media
filters shall be available.
Compressors
All 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
nameplate voltage. Internal
overloads shall be provided with the
scroll compressors. All models shall
have crankcase heaters, low and
high pressure control as standard.
Crankcase Heaters
These band heaters provide
improved compressor reliability by
warming the oil to prevent migration
during off-cycles or low ambient
conditions. These are standard on all
Voyager models.
Refrigerant Circuits
Each refrigerant circuit shall have
independent fixed orifice or
thermostatic 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 a configured
aluminum plate fin shall be
standard. Coils shall be leak tested at
the factory to ensure the pressure
integrity. The evaporator coil and
condenser coil shall be leak tested to
200 psig and pressure tested to 450
psig. All dual compressor units shall
have intermingled evaporator coils.
Sloped condensate drain pans are
standard. Patent-pending 1+1+1
condenser coils, permanently
gapped for easy cleaning.

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 shall also
comply with California requirements
for low NOx emissions. The 12½-25
tons shall have two stage heating
(Gas/Electric Only).
Outdoor Fans
The outdoor fan shall be direct-drive,
statically and dynamically balanced,
draw-through in the vertical
discharge position. The fan motor(s)
shall be permanently lubricated and
shall have built-in thermal overload
protection.
Indoor Fan
Units above shall have belt driven,
FC centrifugal fans with adjustable
motor sheaves. Units with standard
motors shall have an adjustable
idler-arm assembly for quick-
adjustment of fan belts and motor
sheaves. All motors shall be
thermally protected. Oversized
motors shall be available for high
static application. All indoor fan
motors meet the U.S. Energy Policy
Act of 1992 (EPACT).
RT-PRC024-EN