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Installations at High Altitude
Hazard of Explosion!
Adjustment of gas train linkages is normally not required. However, installations at altitudes of
3,000 feet above sea level or higher may require adjustment of the air-fuel linkage for proper
combustion. Linkage and air-fuel adjustment, when necessary, should only be done by an
experienced, qualified gas heat technician. Improper adjustment of the burner air-fuel mixture
could result in death or serious injury.
For high altitude installations, adjustment to the air-fuel linkages may be necessary for proper
combustion. Heater outputs must be derated four percent for every 1000 feet over 2000 feet above
sea level. When specifying gas heaters, the engineer should provide the MBh and airflow required
at altitude. All Trane literature is based on nominal outputs at sea level.
It is recommended that the services of an experienced, qualified gas heat technician be employed
to adjust air-fuel linkages for proper combustion.
Rigging/Lifting
Refer to the Performance Climate Changer™ air handler Installation, Operation, and Maintenance
manual, CLCH-SVX07B-EN, for instructions on equipment rigging and lifting. This manual ships
inside the fan section of the air handler.
Assembly
Refer to the design engineer's plans and submittals for the location of the gas heat section in the
air handler. The gas heat section will arrive at the job site as an individual section. It is not shipped
with the air handler. Hardware for fastening the gas heat section to the air handler can be found
in the fan section. Final assembly of the air handler should be done at the unit installation site. Refer
to the Performance Climate Changer™ air handler Installation, Operation, and Maintenance
manual, CLCH-SVX07B-EN, for further instructions on equipment assembly.
Duct Connections
All duct connections to the gas heat section should be installed in accordance with the standards
of the National Fire Protection Association (NFPA) and the Sheet Metal and Air Conditioning
Contractors National Association, Inc. (SMACNA).
Combustion Air Duct
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If combustion air is to be ducted to the gas heat vestibule, the unit's capacity must be derated to
account for the resistance in the air duct. For every 0.14 inches wg of duct resistance, unit capacity
(MBh output) will reduce by five percent.
If combustion air is ducted to the vestibule, it is strongly recommended that an experienced gas
heat technician check the system and emission levels in the exhaust flue at start up. Carbon dioxide
should be between 8.2 and 9.4 percent. This corresponds to the allowable range of excess air
needed for combustion. The additional static pressure of the inlet air duct may change the fuel-air
ratio slightly necessitating system adjustment.
CLCH-SVX08A-EN
WARNING
Outdoor units with internal vestibules have a rain hood that requires field mounting.
Outdoor units with external vestibules do not have a rain hood. Combustion air enters through
openings in the bottom of the vestibule.
All indoor units ship with a screened opening on the combustion air inlet.
Installation
15
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