Installation and Maintenance Manual

Installation - Mechanical
RLC-SVX09H-EN 73
for the field connections to the condenser, will have screw
terminals for termination in the RTUD control panel with
the exception of the outdoor air temperature sensor
(addressed above). Refer to the wiring diagrams.
Separate fan control algorithms are used for fixed speed
and variable speed systems. For the variable speed fan
deck option, the fan control reverts to fixed speed control
if an inverter drive fault is detected through a binary input
interface with the drive. An informational diagnostic is
also provided to indicate the issue.
For more fan control information, see chapter sections
beginning with "Fan Configurations" on Page 163.
RTUD Condenser Elevation Setting
Condenser elevation setting is a require input during
startup of an RTUD chiller, and is accessible inTechView,
on the Unit View Screen. Go to the Unit View/ChillerTab,
select Condenser Elevation setting and enter condenser
elevation in appropriate units. See Figure 41.The shipped
default of this setting is 0 and it represents the distance of
the bottom of the condenser, relative to the top of the
evaporator. Use a positive value for the condenser above
the evaporator and a negative value for the condenser
below the evaporator. An estimate to within +/- 3 feet is
required.
Condenser elevation setting allows proper EXV operation.
Failure to properly set the elevation can result in low
pressure cutout trips, or low differential pressure trips
during startup or large load transients, as well as poor EXV
liquid level control during operation.
Figure 41. RTUD Condenser elevation setting