Installation and Maintenance Manual

Installation - Mechanical
RLC-SVX09H-EN 61
Do not use a saw to remove end caps, as this may allow
copper chips to contaminate the system. Use a tubing
cutter or heat to remove end caps.
See Table 38, p. 61 for the Levitor condenser model
number. Units 150 tons and above will have one
condenser per circuit.The manifold piping for these
condensers is field supplied.
On units with two separateTrane-supplied condensers
(150-250Ton), a field installed tee is required at the
condenser connections to combine the two internal halves
into a single circuit. See Figure 39, p. 61. In this case, each
separate condenser would be a single circuit. If non-Trane
condensers with multiple circuits are used, a field installed
tee may be required to provide two individual circuits.
Important: To prevent excessive pressure drop in tee,
connection for the combined stream should
not be any smaller than the field run piping.
Condenser by Others
Requirement for Stable fan operation at
low ambient temperatures
Each circuit of the RTUD chiller is capable of unloading to
approximately 30% of its full load capability at any given
operating point.To guarantee no fan cycling at the
minimum compressor load and an ambient temperature
of 32º, the condenser will require the ability to reduce its
minimum capacity with one fan running to roughly ½ of
that 30%, which implies at least 6 fans minimum. Some
amount of slow fan cycling is acceptable depending on the
application. Operating with fewer fans at low ambient
temperatures and minimum loads may cause fast and
prolonged fan cycling and may result in large excursions
in condenser pressure and differential pressures and may
lead to either poor leaving water temperature
performance or nuisance tripping. To avoid this problem
in certain low ambient temperature applications, it may be
necessary to provide that one fan be a variable speed fan
to improve stability and minimal cycling.
WARNING
Hazard of Explosion!
When sweating line connections, always provide
a sufficient purge of dry nitrogen through the
tubing to prevent the formation of oxides/scaling
caused by high temperature from brazing. Use a
pressure regulator in the line between the unit
and the high pressure nitrogen cylinder to avoid
over-pressurization and possible explosion. If any
refrigerant or refrigerant vapors are present a
thorough purge with dry nitrogen will prevent the
possible formation of toxic phosgene gas. Failure
to follow these recommendations could result in
death or serious injury.
Table 38. Levitor Model Numbers
RTUD Size Circuit (s) Levitor Model No.
80 Ton Ckt 1 & 2 LAVC23312
90 Ton Ckt 1 & 2 LAVC24310
100 Ton Ckt 1 & 2 LAVC24410
110 Ton Ckt 1 & 2 LAVC24412
120 Ton Ckt 1 & 2 LAVC25408
130 Ton Ckt 1 & 2 LAVC25410
150 Ton Ckt 1 LAVC23308
150 Ton Ckt 2 LAVC23312
160 Ton Ckt 1 LAVC23312
160 Ton Ckt 2 LAVC23312
180 Ton Ckt 1 LAVC23312
180 Ton Ckt 2 LAVC24308
200 Ton Ckt 1 LAVC24308
200 Ton Ckt 2 LAVC24308
220 Ton Ckt 1 LAVC24308
220 Ton Ckt 2 LAVC24410
250 Ton Ckt 1 LAVC24410
250 Ton Ckt 2 LAVC24410
Figure 38. Condenser manifolding, 80-130Ton
Figure 39. Condenser manifolding, 150-250Ton
Ckt 1
Ckt 2
Discharge
Liquid
Local code
dictates
control panel
clearance
(36” min)
48” min clearance
for airflow
48” min clearance
for airflow
24”min clearance
for servcie
Control Panel
Ckt 1
Ckt 2
Discharge
Liquid
Field piping
requires a tee
Control Panel
48” min clearance
for airflow
Control Panel
24”min clearance
for servcie
48” min clearance
for airflow
48” min clearance
for airflow
Local code
dictates
control pane
clearance
(36” min)