SET-POINT AND DIFFERENTIAL
Set-point is the temperature at which the chiller temperature has to be regulated, at which
time the compressor will go off. Differential is the temperature added after which the
compressor restarts. For example, if Set-point is 7
o
C and differential is 2
o
C, then
compressor will switch off at 7
o
C and restart at 7+2 = 9
o
C.
*******ALARMS*******
Incase of all alarms corresponding LCD readouts and LED signals will display,and the
system will act accordingly. For example if there is an HP1 error, Compressor1 will trip
and restarts with the time delay.
PARAMETER SETTINGS :
All “working” parameters are protected with a hardware key to prevent any
unauthorized access to the data. Press PRG + SEL for more than 5 seconds to enter the
parameter mode. To change any parameter PROKEY must be inserted before entering to
the programming mode.
Display will flash parameter “t1” . Using UP/DOWN key user can scroll all the
parameters . By pressing “SEL” key user can view and change respective parameter
value. Press PRG to store and exit from that particular parameter. To End
Programming press SEL key when LED display shows EP
If you do not press any button within 20 seconds after having entered this
procedure, the unit will return to normal operation without storing the values of the
modified parameters.
Setting and displaying set parameters.
Para
Probe
Set by Min Max Fac.
M.U
Variation
T1
Control Probe calibration.
It may so happen that during the course of
time there may be a slight offset in the actual
temperature and the temperature shown. For
example if the actual temperature is 20
o
C
and the temperature on the controller shows
22
o
C, set this parameter to -2
o
C and once out
of this mode, the temperature will display 20
o
C (22-2
o
C)
U
-10
10
0
o
C
0.5
T2
Antifreeze probe calibration.
Setting as in T1.
U
-10
10
0
o
C
0.5
R1
Set point for compressor1
U
R4
R3
10
o
C
0.5
R2
Set point for compressor2
U
R4
R3
7
o
C
0.5
