103
RTAA-IOM-3
42 - Condenser Limit Setpoint:
Establishes a percentage of the
condenser high pressure cutout, above
which the UCM will begin unloading
compressors and, if necessary,
terminate unit operation.
43 - Lead Lag: Enables or disables the
Auto Lead/Lag feature. See discussion
in “Auto Lead/Lag”.
44 - SI Display Units: When set to
“Enable”, the display units are
converted from OF to IC and PSIG to
Kilopascals Gauge.
45 -Unit Line Voltage (Optional):
Establishes the line voltage coming
into the unit and calibrates the UCM for
Under/Over voltage protection and
display of % volts. See “Unit Power
Supply”.
46 - Under/Over Voltage Protection
(Optional): Enables or disables the
optional under/over voltage protection
feature, if installed.
47 - Phase Unbalance Protection:
Enables or disables the phase
unbalance protection feature. See
discussion in “Phase Unbalance
Protection”.
48 - Phase Reversal Protection:
Enables or disables the phase reversal
protection feature. See discussion in
“Reverse Rotation Protection”.
49 - Superheat Setpoint: Establishes
the temperature of the refrigerant
superheat in the evaporator.
4A - EXV Control Response Setpoint:
Establishes EXV control
responsiveness. If the control appears
to be too responsive, decrease the
setpoint. Increase the setpoint if the
control appears to be sluggish. The
UCM-based default is designed to
handle most applications and
adjustment is usually not necessary.
4b - LWT Control Response Setpoint:
Establishes LWT control
responsiveness. If the control appears
to be too responsive, decrease the
setpoint. Increase the setpoint if the
control appears to be sluggish. The
UCM-based default is designed to
handle most applications and
adjustment is usually not necessary.
4C - ICS Address (Optional): Sets the
address at which a remote controller,
such as a Tracer, multiple-machine or a
remote display panel, can find the
chiller on a Bidirectional
Communications Interface. To use this
interface, the optional 1U2 module
must be installed. The Tracer will look
for the chiller at addresses 55, 56, 57,
58, 59 or 60. The UCM-based default is
address 55. When multiple chillers are
connected to the Bidirectional
Communications Interface, each chiller
must have a unique address, e.g. 55, 56
and 57 for three chillers.
For chillers with the Remote Display
Panel, set the address to “32”. See
RTAA-IOM-2 for further information on
Remote Display Panel.
4d - Fan Control Deadband Bias
Provides sensitivity adjustment of
condensing fan control logic. Must be
set at “0”. Settings other than “0” are
not permitted.
4E - Programmable Relays Setup:
Used for selection of the Alarm/
Running/ Maximum Capacity contact
outputs. See Alarm/Running/Maximum
Capacity Outputs in the Installation -
Electrical section.
4F - Restart Inhibit Timer: Used to
adjust the time (in seconds) between
the power-up of a unit (or the switching
from the STOP/RESET position) and
the initiation of the compressor start
sequence, provided there is a call for
cooling. The typical setting is 120
seconds, but a time as short as 30
seconds may be set.
Note: The anti-recycle timer, which
provides 5 minutes between start
cycles, is not affected by this menu
item.
To Next Page
Loading...
Need help?
General
