Sub-Zero SZ-7511-WV User manual

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4
The SZ-7511-WV controller can be used for several
O O O
applications with a measuring range from -40 C to 99 C (1 C
O O O
Resolution) or -40.0 C to 50.0 C (0.1 C Resolution)
A number of parameters are displayed alphanumerically to set
up the instrument for each specific application.
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”.
The SZ-7511-WV are aesthetically superior versions of their
predecessors. The SZ-7511-WV is a single set point controller
It is specifically designed for refrigeration applications wherein
the compressor cuts off at set point and is restarted at a
temperature of set point plus differential.
Instructions :
3
INDEX
Para. Page Description
2
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
To set the SET Point of the controller.
How to set other parameters.
To set Heating or Cooling function.
Max High Temp limit.
Min Low Temp limit.
To set Differential (Hysterisis).
Probe calibration.
Time Delay (relay restart after cutoff)
Keypad lock.
Relay status on probe failure.
To enable/disable power switch.
To change the resolution.
Restore factory defaults.
End Programming.
Operating messages.
Technical Data.
Suggested Wiring diagram.
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
P1
P2
P3
P4
P5
P6
LP
E1
PO
RS
FS
EP
Function: To set the cut out point
of the controller.
Display will change to set value.
The set point value can now be
changed by using the UP/DOWN
key. After setting the desired
value, 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.
Min Max Fac.
SET
RS = 0
Min Max Fac.
RS = 1
O
0.0 C
O
0 C
P3
P3
P2
P2
www.pvrcontrols.com
INDIA
OPERATING
INSTRUCTIONS
SZ-7511-WV

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78
9 10
P4 Parameter Function: To set the differential.
SET key.
the P4
parameter,
To change
press the
O O
from 0.1 C to 20.0 C when RS = 0.
Differential between cut out and cut
in temperature can be set between
O O
1 C to 20 C when RS = 1 or
Use UP/DOWN keys to set desired
value.
Example : If the set point is set at
O
10.0 C and differential is set at
O
2.0 C, then when the system
O
reaches 10.0 C, the relay will cut
O
out. Since the differential is 2.0 C,
the relay will cut in (restart) at
O O O
12.0 C (10.0 C+2.0 C).
O
0.1 C
O
1 C
Min Max Fac.
RS = 0
O
20.0 C O 2.0 C
Min Max Fac.
RS = 1
O
20 C O 2 C
P5 Parameter Function: To set probe calibration.
To change
the P5
parameter,
press the
SET key.
RS = 0.
Use UP/DOWN keys to set desired
value.
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 value is
O O
from -10 C to 10 C when RS = 1 or
O O
from -10.0 C to 10.0 C when
Example : The temperature on
O
the display is 28.0 C, whereas the
O
actual temperature is 30.0 C. You
will need to set the P5 mode to 2.0,
which means that once out of the
programming mode, the
temperature will show
O O O
30.0 C (28.0 C + 2.0 C).
O
-10.0 C
Min Max Fac.
RS = 0
O
10.0 C O 0.0 C
Min Max Fac.
RS = 1
O
-10 C O 10 C O 0 C
P6 Parameter Function: To set time delay
between relay restart time.
To change
the P6
parameter,
press the
SET key.
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.
Use UP/DOWN keys to set desired
value.
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.
Flashing
Time delay in progress
0 Min
Min Max Fac.
99 Min 3 Min
P1 Parameter
Function: To set controller for heating
or cooling.
To change
the P1
parameter,
press the
SET key.
0
Min Max Fac.
RS = 0 / 1
1 0
Use UP/DOWN keys to get desired
value & press set to confirm.
0: Cooling mode
1: Heating mode.
Function: To set minimum allowable
low temperature set point.
Use UP/DOWN keys to set desired
value. Once set at a particular value,
this will not allow the set point to go
below this value.
Example : Setting this parameter at
O
-30.0 C will not allow the set point to
O
go below -30.0 C. Also, if the
O
temperature reaches -30.0 C, the
display will show Lt (LowTemp.)
indicating that the temperature has
gone below the value in this
parameter.
P3 Parameter
To change
the P3
parameter,
press the
SET key.
(Message on display)
O
-40.0 C
O
-40 C
Min Max Fac.
RS = 0
O
XX C O -40.0 C
Min Max Fac.
RS = 1
O
XX C O -40 C
XX = Set Point
P2 Parameter
Function: To set maximum allowable
high temperature limit.
To change
the P2
parameter,
press the
SET key.
Example : Setting this parameter
O
at 25.0 C will not allow the set point to
O
go above 25.0 C. Also, if the
O
temperature reaches 25.0 C, the
display will show Ht (High Temp.)
indicating that the temperature has
gone above the value in this
parameter.
(Message on display)
H
O
XX C
Min Max Fac.
RS = 0
O
50.0 C O 50.0 C
Min Max Fac.
RS = 1
O
XX C
O
99 C O 50 C
Once set at a particular value, this
will not allow the set point to go
above this value.
Use UP/DOWN keys to set desired
value.
XX = Set Point

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13 14
15
E1 Parameter Function : Relay status on
Probe Failure.
press the
SET key.
To change
the E1
parameter
Use UP/DOWN keys to set desired
value.
0 = Relay status is ON.
1 = Relay performs a duty cycle
OFF.
2 = Relay status is OFF.
When set to
10 minutes ON and 4minutes
0 2 1
Min Max Fac.
RS = 0 / 1
PO Parameter Function : To enable/disable Power
Switch.
To change
the PO
parameter
press the
SET key.
0 1 0
Min Max Fac.
RS = 0 / 1
If press for 2 seconds controller will
go in stand by mode, display will
show “OF”. To again switch to
ACTIVE WORKING MODE, press
power switch again for 2 seconds.
All leds and 7-segment display will
flash and enter into NORMAL
WORKING MODE.
Use UP/DOWN keys to get desired
value & press SET key to confirm.
0 = Disable power switch
Controller has power switch, which
if enable puts controller in active or
stand by state.
1 = Enables power switch
RS Parameter Function : To change the resolution.
To change
the FS
parameter
press the
SET key.
0 1 0
Min Max Fac.
RS = 0 / 1
Use UP/DOWN keys to set desired
value.
Note : Temperature and parameter
will also change accordingly.
If this parameter when set to 1,it will
0
take all parameter in 1 C resolution.
If this parameter when set to 0,it will
0
take al l parameter in 0.1 C
resolution.
LP Parameter. Function: To lock keypad.
To change
the LP
parameter
press the
SET key.
1 = keypad locked
This parameter can lock the keypad
so that tampering is not possible by
by-standers.
0 = keypad unlocked
When locked all parameters can
only be viewed, but not modified.
Use UP/DOWN keys to set desired
value.
0 1 0
Min Max Fac.
RS = 0 / 1
FS Parameter Function : To restore default
settings of the controller.
To change
the FS
parameter
press the
SET key.
0 1 0
Min Max Fac.
RS = 0 / 1
When set to 1 all parameters are
programmed to factory values.
Useful to debug setting related
problems.
16
EP Parameter
To end
programming
press the
SET key
Once the SET key is pressed, the
control goes into the normal mode
and displays the temperature and all
settings are recorded.
Function: To end programming.

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CAUTION
Notice: The information in this document is subject to
change in order to improve reliability , design or function
without prior notice and does not represent a commitment on
the part of the company. In no event will the company be
liable for direct, indirect, special, incidental or consequential
damage arising out of the use or inability to use the product
or documentation, even if advised of the possibility of such
damages. No part of this manual may be reproduced or
transmitted in any form or by any means without the prior
written permission of the company.
WIRING: The probe and its corresponding wires should never be
installed in a conduit next to control or power supply lines. The
electrical wiring should be done as shown in the diagram. The
power supply circuit should be connected to a protection switch.
The terminals admit wires of upto 2.5sq mm.
WARNING: Improper wiring may cause irreparable damage and
personal injury. Kindly ensure that wiring is done by qualified
personnel only.
Maintenance: Cleaning: Clean the surface of the controller with
a soft moist cloth. Do not use abrasive detergents, petrol, alcohol
or solvents.
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Display : 3 X14.2 mm (0.56") LED
Housing : White, ABS Plastic
Front Cover : Red Polycarbonate plastic.
Light Relay : 5A, 250Vac(res.)
O O
Resolution : 1 C / 0.1 C.
< 2.5sqmm one wire/terminal only
O O O
Range : -40 C to 99 C (1 C).
O
Accuracy : +/- 1 C.
Power input : 230Vac +/-15%,50-60Hz.
Input : NTC probe, SZ-N75.
Compressor Relay : 8 (3)A, 250Vac.
Connections : Screw terminal blocks.
Other on request.
Dimensions : Front : 80 X 126 mm,
Depth
: 15
mm.
OO
Probe tolerance at 25 C : +/- 0.3 C.
Mounting : Wall Mount.
Technical data:
Data storage : Non-volatile EEPROM memory
O O
Storage temp : -20 C to 70 C(non-condensing).
Output :
O O
Operating temp. : 5 C to 50 C(non-condensing).
O O O
-40.0 C to 50.0 C (0.1 C).
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NEUTRAL
To SZ-N75
Compressor, Contactor
or Heater 8(3)A max
PHASE
Caution:Wiring for 230Vac load only
10
8 9 11
7
230V
1
NC NOC
PROBE
6
COMP
5
4
C NONC
3
LIGHT
Light 250VAC, 5A(res.)
FRONT VIEW
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17
Operating messages and Icon status
Parameter
Message Description
P2
Ht Temperature above the maximum
limit of the set point.
P3
Lt
Temperature below the minimum limit
of the set point.
PP
Probe short circuit, circuit open or without
0 0
probe, or temperature > 99 C or <-40 C
0
when RS=1 and temperature >50.0 C or
0
<-40.0 C when RS=0.
SP, P4
Comp. Relay ON/OFF.
On/Off
LP
Keypad locked/unlocked
On/Off
P6
Time delay in progress
Flashing
Light Relay ON/OFF.
On/Off
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Power Key Used to switch ON the controller.
Set Key
UP Key Used in program mode and set mode
to increment parameter value.
Down Key /
Program Key
Used to enter into the program mode.
Key Introduction
Also used as Down key to decrement
parameter value in program mode.
Used in program mode to set/save the
changed value of parameter.
If press UP key once Light Relay & LED
will become ON and If press again once
Light Relay & LED will become OFF.

Disclaimer: This manual & its contents remain the sole property of
PVR Controls, India and shall not be reproduced or distributed
without authorization. Although great care has been taken in the
preparation of this document, the company or its vendors in no event
will be liable for direct, indirect, special, incidental or consequential
damage arising out of the use or inability to use the product or
documentation, even if advised of the possibility of such damages.
No part of this manual may be reproduced or transmitted in any form
or by any means without the prior written permission of the company.
PVR Controls, reserves the right to make and changes or
improvements without prior notice.
Warranty: This product is warranted against defects in
materials and workmanship for a period of one year from the
date of purchase. During the warranty period, product
determined by us to be defective in form or function will be
repaired or, at our option, replaced at no charge. This
warranty does not apply if the product has been damaged by
accident, abuse, and misuse or as a result of service or
modification other than by the company. This warranty is in
lieu of any other warranty expressed or implied. In no event
shall the company be held liable for incidental or
consequential damages, including lost revenue or lost
business opportunity arising from the purchase of this
product.
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