Sub-Zero SZ-7512-P Instruction Manual

SZ-7512-P
Instruction Manual
Intriduction
The SZ-7512-P is a Digital Antifreeze Thermostat with Manual Reset
facility and Alarm (Buzzer) facility. This has a Fixed Differential of
O
2 C.
The SZ-7512-P can be used as a direct replacement to the following
Mechanical Antifreeze Thermostats: -
a) Honeywell T675-B
b) Danfoss-KP61
c) Ranco-6953,
d) Johnson A19ACA-15C
e) White Rodgers 16A60-9
The Alarm is automatically set equal to the Set Point and can be
muted with the 'RST' key.
The Controller functions similar to the above-mentioned
Mechanical Thermostats i.e., Relay will go OFF when the Set Point
is achieved and the same can be restarted only if the Differential is
reached and the 'RST' key is pressed.
Cautions
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.
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.
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.
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.
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.
Panel Cut-out & Dimensions
Suggested Wiring Diagram
Technical Data
Housing : Black ABS Plastic, Auto-extinguish
Front Cover : Polycarbonate Plastic
Dimensions : Frontal: 75 X 34.5 mm, Depth: 80 mm
Panel Cut-out : 29 x 71mm
Mounting : Flush panel mounting with fasteners
Protection : IP65 Front (with gasket)
Connections : Screw terminal blocks.
< 2.5sq mm terminal only.
Display : 2 X 14.2mm (0.56") LED.
Data storage : Flash APROM Memory
Power input : 230Vac, +/-10% 50-60Hz.
Others on request.
Operating temp. : 5°C to 50°C (non-condensing)
Storage temp. : -20°C to 70°C (non-condensing)
Output : 1 SPDT Relay 8(3)A 250VAC
Input : NTC Probe – SZ-T75
Measuring Range : -50°C to 50°C
Resolution for Temp.: 1°C
Accuracy for Temp. : +/- 1°C
O O
Probe tolerance at 25 C : +/- 0.3 C.
Alarm (Buzzer) : SZ-B75, 10Vdc, 10mA
User Interface
In Program Mode/Set Mode:
Scroll through parameters & Increases parameter
value.
Press and hold for 2 sec to enter into Program
Mode.
In Program Mode/Set Mode: Decreases parameter
value.
In Program Mode/Set Mode:
Set/Save the changed value of parameter.
This key will reset the Relay and mute the Buzzer
Alarm.
Index
Sr Para Description
1 To set the Set Point of the Controller
2 How to set other parameters
3 Probe Calibration
4 Keypad Lock
5 Alarm - to activate Buzzer
6 Restore factory defaults
7 Exit from Program Mode
8 LED Indications
9 Operating messages
10 Disclaimer & Warranty
Parameter List
1. Function: To set the Cut-Out Point of the Controller.
Press & Hold key for 2 seconds.
Display will change to set range flash. The Set Point range can now
be changed by using the UP/DOWN keys. After setting the desired
range, press the SET key and you will see "_ _ " which confirms
that the Set Point has been stored in memory.
Min Max
-50 O C 50 O C
2. To Set Display will show 'P5' & flash to go other
Other parameters, use UP / DOWN keys.
Parameters
Press &
hold
key for
2 seconds
3. Function: To set Probe Calibration.
To change value use
To set value press
keys.
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
is from -10 O C to +10 O C
Example: The Temperature on the Display is 28
actual Temperature is 30 O C. You will need to set the P5 mode to
2 O C, which means that once out of the Programming Mode, the
Display will show the Temperature 30 O C (28
Min
-10 O C
4. Function: To Lock Keypad.
This Parameter can lock the keypad so that tampering is not
possible by by-standers.
If this parameter is set to,
0 = Keypad Unlocked
1 = Keypad Locked
Note: When Parameter are locked, User can only be viewed, but
cannot be modified.
Min
0
5. Function: To Activate / Deactivate Buzzer.
Once set to 1, the Buzzer will come ON incase the Temperature is
equal to the Set Point.
0 = Deactivates Buzzer.
1 = Activates Buzzer.
Note: Buzzer will be ON in Probe Fail condition irrespective of AL
parameter.
Min
0
6. Function: To restores Default Settings of the
Controller.
When set to 1 all parameters are programmed to default values.
Useful to debug setting related problems.
Min
Fact. Set
0
3 O C
key
O
C, whereas the
O C + 2 O C).
Max Fact. Set
10 O C 0 O C
Max Fact. Set
1 0
Max Fact. Set
1 1
Max Fact. Set
1 1