Sub-Zero SZ-7516-P User manual

OPERATING
INSTRUCTIONS
SZ-7516-P
www.pvrcontrols.com
1
4
The Sub-Zero Series 7516-P are aesthetically superior
versions of their predecessors. The SZ 7516-P is a single set
point controller with buzzer. They are specifically designed for
blood bank applications wherein the compressor cuts off at set
point and is restarted at a temperature of set point plus
differential, also if the power fails the controller indicates blood
bank temperature for monitoring purpose.
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.
GENERAL DESCRIPTION
The SZ-7516-P controller can be used for several applications
O O
with a measuring range from -50 C to 99 C.
Instructions : SZ 7516-P
INDEX
Para. Page Description
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.
Alarm-to activate & reset buzzer.
Relay status on probe failure.
Restore factory defaults.
End Programming.
Operating messages.
Technical Data.
Suggested Wiring diagram.
Panel cutout & dimensions.
P1
P2
P3
P4
P5
P6
LP
AL
E1
FS
EP
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
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
-50 C AND 99 C REMOVE
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.
P2
P3 O
0 C
Min Max Fac.
3
SET

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 value & press set
to confirm.
0: Cooling mode and
1: Heating mode.
Min Max Fac.
6
8
P4 Parameter Function: To set the differential.
To change
the P4
parameter,
press the
SET key.
Use UP/DOWN keys to set
desired value.
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) :
O
If the 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.
To compensate for this error, you
may need to add or minus the
degrees required to achieve the
correct temperature. Setting value
O O
is from -10 C to +10 C.
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.
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
P2 Parameter
Function: To set maximum allowable
high temperature limit.
To change
the P2
parameter,
press the
SET key.
Use UP/DOWN keys to set
desired value.
Once set at a particular
value, this will not allow the
set point to go above this
value.
the display will show Ht (High
Temp.) indicating that the
temperature has gone above the
value in this parameter and at this
point the buzzer will activate.(if AL
parameter is set to 1)
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,
O
XX C
Max Fac.
O
99 C O 99 C
Min
(Message on display)
H
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
value.
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.
Flashing
Time delay in progress
7
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
O
at -30 C will not allow the set point
O
to 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 value in this
parameter and at this point the
buzzer will activate.
P3 Parameter
O
-50 C
Max Fac.
O
XX C O -50 C
To change
the P3
parameter,
press the
SET key.
Min
(Message on display)
XX = Set Point
XX = Set Point

12
13
LP Parameter.
0 1 0
Function: To lock keypad.
press the
SET key.
To change
the LP
parameter
Use UP/DOWN keys to set
desired value.
0 = keypad unlocked
When locked all parameters can
only be viewed, but not modified.
1 = keypad locked
This parameter can lock the
keypad so that tampering is not
possible by by-standers.
Min Max Fac.
14
15
E1 Parameter
0 2 1
Function : Relay status on
Probe Failure.
Min Max Fac.
To change
the E1
parameter
press the
SET key.
Use UP/DOWN keys to set
desired value.
When set to
0 = Relay status is ON.
1 = Relay performs a duty cycle
10 minutes ON and 4minutes
OFF.
2 = Relay status is OFF.
11
AL Parameter Function : To activate buzzer.
0 1
Min Max Fac.
1
To change
the AL
parameter,
press the
SET key.
AL parameter.
Use the UP/DOWN keys to set
alarm on or off. Once set to on, the
buzzer will come on incase the
temperature reaches or goes
above or below the points set in
parameter P2 & P3 and if the
probe fails.
1 = Activate the buzzer.
0 = Deactivate the buzzer.
Note=Alarm will be ON in probe
fail condition irrespective of
This key will mute the buzzer alarm if
pressed for 2 seconds.
RST
FS Parameter Function : To restore default
settings of the controller.
01 0
Min Max Fac.
To change
the FS
parameter
press the
SET key.
When set to 1 all parameters
are programmed to factory
values.
Useful to debug setting
related problems.
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.
P7 AND P8 PARAMTR REMOVE
16
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 <-50 C
SP, P4
Comp. Relay on/off
On/Off
P6
Time delay in progress
Flashing
LP
Keypad locked/unlocked
AL,P2,P3
Alarm (Ht, Lt or PP)
Flashing
On/Off

21
Controller :Controller should be installed in a place
protected by vibration, water and corrosive gasses and
where ambient temperature does not exceed the
values specified in the technical data.
Installation : Fixing and dimensions of panel models:
To fix the unit, slide the fastener 1 through the guides 2
as per the position shown in the figure. Move the fastener in
the direction of the arrow, pressing tab 3 it permits to move
the fastener in the opposite direction of the arrow. Once the
controller has been connected, they should be covered with
the lid 4 Silicon sealant should be applied along the
perimeter of the panel cut out or a rubber ‘O’ ring supplied
before the unit is fitted to increase protection against water
seepage.
Probe :To give a correct reading, the probe must be
installed in a place protected from thermal influences,
which may affect the temperature to be controlled.
22
CAUTION
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.
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.
is done by qualified personnel only.
WARNING: Improper wiring may cause irreparable damage
and personal injury. Kindly ensure that wiring
Maintenance: Cleaning: Clean the surface of the controller
with a soft moist cloth. Do not use abrasive detergents, petrol,
alcohol or solvents.
20
SZ-7516-P
RST
88
-
3
1
42
34.5mm
71mm
19mm
10mm
MAX
71mm
29mm
Panel cutout
19
GASKET
PANEL Side Lock
CONTROLLER
SuggestedWiringDiagram
10V
NEUTRAL
7
BUZZER
8
+ -
12
11
To SZ-N75
To SZ-B75
(10Vdc,
10mA max)
PHASE
3
1
Caution:Wiring for 230Vac load only
46
RELAY
NO C
NC
Compressor, Contactor
8(3)A max
59 10
BLACK RED
+-
BATTERY
INPUT
PROBE
9.6Vdc
18
17
Other on request
Housing : Black, ABS Plastic
Front Cover : Polycarbonate plastic.
Power input : 230Vac +/-20%,50-60Hz.
Technical data:
Frontal protection : I.P65
Panel Cutout : 29 X 71 mm
2.5sqmm one wire/ terminal only
Display : 2 X14.2 mm (0.56") LED
Connections : Screw terminal blocks.
Data storage : Non-volatile EEPROM memory
Dimensions : Front : 75 X 34.5 MM,
Depth
: 7
1 MM (w/o back lid)
O O
Storage temp : -20 C to 70 C(non-condensing).
O
Accuracy : +/- 1 C.
Mounting : Flush panel mounting with fasteners
O O
Range : -50 C to 99 C.
Output :1 SPDT relay 8 (3)A, 250Vac.
O O
Operating temp.: 5 C to 50 C(non-condensing).
OO
Probe tolerance at 25 C : +/- 0.3 C.
Input : NTC probe, SZ-N75.
Battery Input For Backup : 9.6Vdc, 1800mAh (MAX)
on request for 72Hr Backup.
O
Resolution : 1 C.
Alarm (buzzer) : SZ-B75. 10Vdc,10mA.

INDIA
Ball Valves
Globe Valves
Hand Valves
Flow Switches
Solenoid Valves
OUR OTHER PRODUCTS
Cold Room Controller
Chiller Controller
Two Compressors Controller
Heating Controller
Humidity Controller
Pressure Controller
TM
02 / 21.10.13
23
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..