Technical information

OPERATION
4-9
UGH024/1103 Portable Chiller
TIC C
ONTROL
CHANGING
THE P
ROCESS
VARIABLE
(PUS)
The Process variable selector allows the operator to select the
controlled temperature from the following: To Process, From
Process and Average. The default is the average temperature
and the tuning parameters are set up for this. If the chiller is
used in a no tank system then the From process temperature
should be selected.
Depending on system size select the appropriate tuning para-
meter set, See Tuning the Chiller.
This features allows the operator to select the controlled tem-
perature from the following: To process, From process and
Average. The default is set at Average.
Press the Enter until the default configuration
page UN.
Toggle up/down keys until until PUS
flashes on the display
Press Enter and use the up/down keys to
select “to” fro” or A”.
Press Enter to accept the units.
1
2
4
3
TIC T
UNING
THE
CHILLER
(PIT)
The controller has three pre-configured tuning parameter sets,
one of which should allow optimum temperature control.
Following is a description of each of the choices available to
an operator:
Slow Responding system:
Select the slow setting “SLO” for large systems*. More than
1,700 pounds (200 gallons) of water and more than 14,000
lbs of steel might be considered a large system. This setting
has the smallest proportional band (1ºF), which allows larger
changes in the control output when the process temperature is
far from setpoint. This should reduce cycling around the set-
point.
Normal Responding System:
Normal “nOr” is the factory default tuning setting, as it will
cover the majority of applications. This setting is appropriate
for systems* with 250 to 1,700 pounds (30-200 gallons) of
water and 2,000 to 14,000 pounds of steel. The default value
for the normal proportional band is 2ºF.
Continued
NOTE: Normal parat-
meter is the factory
default setting