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5. ICS Address
ICS address is used only with Trane BAS systems for
machine ID during communications.
Range of Values is 1 to 127 in increments of 1.
Module Default is 66.
6. Power Up Start Delay Time
This timer allows operators to stagger restarts of multiple
chillers after a power outage. This prevents excessive
locked rotor amps from being drawn at the same time.
Range of Values is 0 to 600 seconds in increments of 1.
Module Default is 0 second.
7. Cooling Delta Temperature Setpoint
Enter the value of the difference between the entering and
leaving design chilled water temperatures. Be sure to set
this according to the design conditions, as it will affect
machine operation. This control feature allows the chiller to
control according to what percentage the machine is of its
design full capacity. This assumes constant flow.
The selectable Range of Values are 4 to 30°F (2.2 to 16.7°C)
in increments of 1 or 0.1°F or C depending on the Service
Setup Screen xxx or xxx.x. Module Default is 10°F (5.5°C).
8. Leaving Water Temperature Cutout Setpoint
Range of Values is 35 to 38°F in increments of 1 or 0.1°F or
C depending on the Service Setup Screen xxx or xxx.x. The
Module Default is 38°F (3.3°C).
When the chilled water cutout setpoint is within 1.7°F of the
CLD Chilled Water Setpoint, the CLD Chilled Water Setpoint
is increased along with the cutout setpoint to maintain the
1.7°F differential. A message will be displayed for 2 seconds
to indicate that the FPCW setpoint has been increased.
9. Low Refrigerant Temperature Cutout Setpoint
Range of Values is 35 to 38°F in increments of 1 or 0.1°F or
C depending on the Service Setup Screen xxx or xxx.x. The
module Default is 38°F (3.3°C).
When the cutout setpoint is within 2.7°F of the CLD Chilled
Water Setpoint, the CLD Chilled Water Setpoint is increased
along with this setpoint to maintain the differential. A
message will be displayed for 2 seconds to indicate that the
FPCW setpoint has been increased.
10. Softloading Time Setpoint
Soft load time (control response) is the time that the control
will use to ramp to a new target set point. This setpoint is
always active when the machine is started for softload, or
any chilled water setpoint change.
The selectable Range of Values is 0 to 100 in increments of
1. The module Default is 15. A value of 0 minutes disables
Softloading.
(See Also Softloading under “Control“).
11. Energy Valve Soft Unload Control - INDIRECT FIRED
ONLY
This feature can be enabled or disabled on steam or hot
water machines. The purpose of this feature is to ramp the
closure of the energy valve upon normal shutdown. This
prevents the unnecessary tripping of field supplied
pressure relief valves which have been known not to react
as fast as the chiller valve. Energy valve will not soft unload
in the event of emergency stop or abnormals.
12. Energy Valve Soft Unload Rate:
Present only when above is enabled. Range of Values is 1
to 9 percent of allowable range per 5 second period. Default
is 3%. For example. Valve will close 3% of its allowable
range of travel in 5 seconds. [9 fastest, 1 slowest].
13. OPTION: Under or Over Voltage Protection Enable
This screen is suppressed when the Line Voltage Sensing
Option is not installed. Enable only if potential transformers
are installed and functional. Possible values of [d/e] are:
Disable; Module Default Enable.
14. Absorber or Condenser Temperature Low Relay
Setpoint
Used to control an external device in an attempt to correct
the low tower temperature to minimize “carry-over” in the
generator-condenser section. When the absorber entering
water temperature is below this setpoint, the relay will
energize, and at 5 degrees F, above this setpoint, the relay
will de-energize. On power-up, if the Absorber Entering
Water temperature is within the 5-degree hysteresis band
the relay will be de-energized. This setting does not alter
any other internal control algorithm. It does not change the
internal low abs temperature limit algorithm.