Sub-Zero SZ-7510-P-DI Operating Instructions Manual
OPERATING
INSTRUCTIONS
SZ-7510-P-DI
www.subzero.co
1
4
GENERAL DESCRIPTION
The Sub-Zero Series SZ-7510-P-DI are aesthetically superior
versions of their predecessors. The SZ-7510-P-DI is a single
set point controller. with digital input. They are specifically
des ign ed for ref riger ati on app lic ation s wh erein the
compressor cuts off at set point and is restarted at a
temperature of set point plus differential.
Additionally these controllers offer several protection features
that are easily understood by the examples in the instructions
below. The controller can be used for heating applications,
when the P1 parameter is set to “1” .
A number of parameters are displayed alphanumerically to set
up the instrument for each specific application.
The SZ-7510-P-DI controller can be used for several
O O
applications with a measuring range from -50 C to 99 C.
Instructions :
Function: To set the cut out
point of the controller.
Display will change to set range.
The set point range can now be
changed by using the UP/DOWN
key. After setting the desired
range, press the set key and you
will see “- - -” which confirms that
the set point has been stored in
memory.
Set point
Press and hold
the SET
key for
2 Seconds.
O
-50
C
O
99
C
O
10 C
Min
Max
Fac.
3
INDEX
Para. Page
Description
P1
P2
P3
P4
P5
P6
d0
d1
d2
d3
LP
E1
FS
EP
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
2
INDIA
To set other
Parameters.
Display will show P1 & flash.
To go to other parameters,
use UP/DOWN keys.
Press & hold
the DOWN(prg)
key for
2 seconds.
prg
SET
To set the SET Point of the controller.
How to set other parameters.
To set Heating or Cooling function.
Max High Temp limit & alarm.
Min Low Temp limit & alarm.
To set Differential (Hysterisis).
Probe calibration.
Time Delay (relay restart after cutoff)
Keypad lock.
Relay status on probe failure.
Restore factory defaults.
End Programming.
Operating messages.
Technical Data.
Wiring diagram.
Panel cutout & dimensions.
Activate or deactive digital input function.
Set reset mode for digital input
Set the count mode for CCF
Set the number of count for CCF
5
P1 Parameter
Function: To set controller for heating
or cooling.
0 1 0
To change
the P1
parameter,
press the
SET key.
Use UP/DOWN keys to get
desired range & press set
to confirm.
0: Cooling mode and
1: Heating mode.
Min Max
Fac.
6
7
8
P4 Parameter
Function: To set the differential.
To change
the P4
parameter,
press the
SET key.
Use UP/DOWN keys to set
desired range.
Differential between cut out and
cut in temperature can be set
O O
between 1 C to 20 C.
O
1 C
Min Max
Fac.
O
20 C
O
2 C
Example (in cooling mode): If the
O
set point is set at 10 C and
O
differential is set at 2 C, then when
O
the system reaches 10 C, the relay
will cut out. Since the differential is
2, the relay will cut in (restart) at
O O O
12 C (10 C+2 C).
9
P5 Parameter
Function: To set probe calibration.
To change
the P5
parameter,
press the
SET key.
Use UP/DOWN keys to set desired
range.
In time it may be possible that the
display may be offset by a degree
or so.
To compensate for this error, you
may need to add or minus the
degrees required to achieve the
correct temperature. Setting range
O O
is from -10 C to +10 C.
O
-10 C
Min Max
Fac.
O
10 C
O
0 C
Example: The temperature on
O
the display is 28 C, whereas the
O
actual temperature is 30 C. You will
need to set the P5 mode to 2,
which means that once out of the
programming mode, the
temperature will show
O O O
30 C (28 C + 2 C).
10
Function: To set minimum allowable
low temperature set point.
Use UP/DOWN keys to set desired
range. Once set at a particular
range, this will not allow the set
point to go below this range.
Example: Setting this parameter at
O
-30 C will not allow the set point to
O
go below -30 C. Also, if the
O
temperature reaches -30 C, the
display will show Lt (LowTemp.)
indicating that the temperature has
gone below the range in this
parameter.
P3 Parameter
O
-50 C
Max
Fac.
O
XX CO-50 C
To change
the P3
parameter,
press the
SET key.
Min
(Message on display)
P6 Parameter
0 Min
99 Min
3 Min
Function: To set time delay
between relay restart time.
To change
the P6
parameter,
press the
SET key.
Min
Max
Fac.
Use UP/DOWN keys to set desired
range.
This parameter is used to protect
the compressor from restarting in a
short period of time and can be set
between 0 to 99 minutes.
Example: If this parameter is set at
3 minutes, the relay will cut off at
the set temperature, but will not
restart for a minimum of 3 minutes,
even if the differential is achieved
earlier. This parameter is good to
protect the life of the compressor
when there are power fluctuations
and the compressor is switched off
and on within a few seconds.
P2 Parameter
Function: To set maximum allowable
high temperature limit.
O
XX C
To change
the P2
parameter,
press the
SET key.
Max
Fac.
Use UP/DOWN keys to set
desired range.
Once set at a particular
range, this will not allow the
set point to go above this
range.
O
99 CO99 C
Example: Setting this parameter
O
at 25 C will not allow the
O
set point to go above 25 C. Also,
O
if the temperature reaches 25 C,
the display will show Ht (High Temp.)
indicating that the temperature.
has gone above the range in this
parameter.
Min
(Message on display)
Flashing
Time delay in progress
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