Installation and Maintenance Manual

Installation - Mechanical
60 RLC-SVX09H-EN
Remote Air-Cooled Condenser Interconnection Refrigerant Piping
The RTUD compressor chiller is shipped with a full charge
of oil and a nitrogen holding charge.The Levitor II unit is
an air-cooled condenser that is designed for use with the
RTUD unit.The RTUD unit is designed to be most effective
when used with the Levitor II aircooled condenser. Other
air-cooled condensers can be used in place of the Levitor
II condenser, but the overall performance of the system
may be different from that published in the catalogs.The
following section covers the required piping between the
RTUD unit and the appropriate air-cooled condenser.
The RTUD unit consists of an evaporator, two helical rotor
compressors (one per circuit), oil separators, oil coolers,
liquid line service valves (NOT isolation valves), sight
glasses, electronic expansion valves and filter.The
discharge line leaving the oil separator and liquid line
entering the filters are capped and brazed.The installing
contractor need only provide the interconnecting piping,
including liquid line isolation valves, between the RTUD
and the air-cooled condenser.
Important: RTUD units are not shipped with factory
installed liquid line isolation valves. Liquid
line isolation valves must be field installed.
Trane does not approve the use of underground
refrigerant piping. Potential problems include dirt and
moisture in the lines during assembly, condensation of
refrigerant in the lines during off-cycle, which creates
liquid slugs and potential damage to parts or
controllability issues, and vibration/corrosion damage.
For best reliability and performance, the RTUD should be
matched withTrane Levitor II. If a non-Levitor II condenser
is used, overall performance and reliability of the RTUD
may be affected. Depending on the customer's fan control,
nuisance trips may occur on the RTUD unit, due to head
pressure instability.
If a non-Levitor II condenser is a supplied, it must be
capable of providing a minimum of 5 F subcooling at the
EXV.The RTUD requires subcooled liquid at the expansion
valves. Without a minimum of 5 F subcooling, the RTUD
will not operate as designed.
Piping should be sized and laid out according to the job
plans and specifications.This design should be completed
during system component selection.
Note: Use Type L refrigerant-grade copper tubing only.
The refrigerant lines must be isolated to prevent line
vibration from being transferred to the building. Do not
secure the lines rigidly to the building at any point.
Important: Relieve nitrogen pressure before removing
end caps.
Figure 37. Condenser below the compressor chiller
Trap
Liquid Line
Discharge Line
15 ft
max