Trane Voyager 27½ to 50 Ton Installation, Operation And Maintenance Manual page 8

Forced Combustion Blower
Negative Pressure Gas Valve
Hot Surface Ignitor
Outstanding Standard and Optional Components
Drum and Tube Heat Exchanger
The drum and tube heat exchanger is
designed for increased efficiency and
reliability and utilizes the same
technology that has been incorporated
into large commercial roof top units for
over 20 years.
The heat exchanger is manufactured
using optional stainless, or standard
aluminized, steel with stainless steel
components for maximum durability. The
requirement for cycle testing of heat
exchangers is 10,000 cycles by ANSI
Z21.47 . This is the standard required by
both UL and AGA for cycle test
requirements. Trane requires the design
to be tested to 2½ times this current
standard. The drum and tube design has
been tested and passed over 150,000
cycles which is over 15 times the current
ANSI cycling requirements.
The negative pressure gas valve will not
allow gas flow unless the combustion
blower is operating. This is one of the
unique safety features of Voyager
Commercial.
The forced combustion blower supplies
pre-mixed fuel through a single stainless
steel burner screen into a sealed drum
where ignition takes place. It is more
reliable to operate and maintain than a
multiple burner system.
The hot surface ignitor is a gas ignition
device which doubles as a safety device
8
Features and
Benefits
Drum and Tube Heat Exchanger
utilizing a continuous test to prove the
flame. The design is cycle tested at the
factory for quality and reliability.
All the gas/electric rooftops exceed all
California seasonal efficiency
requirements. They also perform better
than required to meet the California NOx
emission requirements.
High Efficiency Condenser Coil
Increased capacity and energy efficiency
with optional high capacity third row
condenser coil with or without black
epoxy pre-coating.
Excellent Part-Load Efficiency
The unique design of the scroll
compressor allows it to be applied in a
passive parallel manifolded piping
scheme, something that a "recip" just
doesn't do very well.
When the unit begins stage back at part
load it still has the full area and circuitry of
its evaporator and condenser coils
available to transfer heat. In simple terms
this means superior part-load efficiencies
(IPLV) and lower unit operating costs.
Rigorous T esting
All of Voyager's designs were rigorously
rain tested at the factory to ensure water
integrity.
Actual shipping tests are performed to
determine packaging requirements. Units
are test shipped around the country.
Factory shake and drop tested as part of
the package design process to help
assure that the unit will arrive at your job
site in top condition.
Rigging tests include lifting a unit into the
air and letting it drop one foot, assuring
that the lifting lugs and rails hold up under
stress.
We perform a 100% coil leak test at the
factory. The evaporator and condenser
coils are leak tested at 200 psig and
pressure tested to 450 psig.
All parts are inspected at the point of final
assembly. Sub-standard parts are
identified and rejected immediately.
Every unit receives a 100% unit run test
before leaving the production line to
make sure it lives up to rigorous Trane
requirements.
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