Sub-Zero SZ-7081 Operating Instructions Manual
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Sub-Zero SZ-7081 Operating Instructions Manual

Sub-Zero SZ-7081 Operating Instructions Manual

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Table of Contents

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www.ascontrols.com
GENERAL DESCRIPTION
The SZ-7081 is single setpoint temperature controller.
It has unique features and user friendly parameters.It is
designed for Heating as well as Cooling applications. In
Heating mode it can work in either Proportional or On-Off
mode.
Additionally the SZ-7081 offers several protection
features that are easily understood by the examples
given in the instruction manual.
The controller can be used for several applications
with mesuring range as below:
0 C
to 70
O
to 999
O
: -99
C
to 850
O
: -99.9
C
O
0 C
O
C
O
C
O
to 99.9
C
O
OPERATING
INSTRUCTIONS
SZ-7081
INDEX
Parameter setting
Parameter
method.
To display set point. The Set point can not be changed but
can only be viewed in this mode.
To set Cutout value of the Controller.
To select the type of sensor.
To select type of output.
To set relay mode as per application.
To set Control Action of Output.
To set Proportional Band. This parameter is activated in
To set Hysterisis (differential). Activated in On-Off mode
To set cycle Time in seconds. Activated in Proportional
To set manual offset for proportional band. Activated in
Proportional mode only.
To set Time Delay. This parameter is activated in On-Off
Mode only.
To set minimum limit for set point as per the sensor
selected.
To set Probe calibration.
To restore default settings.
Panel cutout & Installation
Pg. No.
1
1
2
3
3
4
4
5
6
6
7
8
8
9
10
10
10
11
12
13
14-16

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Questions and answers

krishnamurthy
May 20, 2025

how to set up with compressor of water chiller with 3 wire RTD wit upper and lower temperature imits

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1 comments:
Mr. Anderson
May 24, 2025

To set up the Sub-Zero SZ-7081 water chiller compressor with a 3-wire RTD and configure the upper and lower temperature limits:

1. Wiring the RTD Sensor:
- Connect the 3-wire RTD sensor to terminals 1, 2, and 3 as per the wiring diagram.
- Ensure the wiring is not in the same conduit as power lines to avoid interference.

2. Power Supply:
- Connect the power supply (230V) to the designated terminals.
- Use a protection switch and wires up to 1.5 sq mm.

3. Installing the Controller:
- Mount the unit in a vibration-free, dry area without corrosive gases.
- Apply silicon sealant or use a rubber O-ring around the panel cutout for IP65 protection.

4. Setting Temperature Limits:
- Lower Limit:
- Use UP/DOWN keys to select the minimum set point (e.g., 0°C).
- Press the SET key to store the value.
- Upper Limit:
- Use UP/DOWN keys to set the maximum temperature (e.g., 60.0°C).
- Press SET to confirm. If the temperature goes above this, the display shows “Ht” (High Temp).

5. Compressor Protection:
- Set a time delay (e.g., 3 minutes) to prevent short-cycle restarting of the compressor.

Make sure all settings are stored by pressing the SET key after each adjustment.

This answer is automatically generated

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Summary of Contents for Sub-Zero SZ-7081

  • Page 1: Table Of Contents

    Parameter Pg. No. method. The SZ-7081 is single setpoint temperature controller. It has unique features and user friendly parameters.It is To display set point. The Set point can not be changed but designed for Heating as well as Cooling applications. In can only be viewed in this mode.

  • Page 2: J Type Thermocouple : To

    Description of parameters and functions. Description of parameters and functions. Range Range Parameter setting Parameter setting Parameter Parameter Sr.No. Sr.No. Fact. Fact. method. method. Viewing Set Function: To display set point. To set other Program mode Points The Set point cannot be parameters.

  • Page 3: Proportional Mode Only

    Description of parameters and functions. Description of parameters and functions. Range Range Parameter setting Parameter setting Parameter Parameter Sr.No. Sr.No. Fact. Fact. method. method. Hysterisis Function: To set Hysterisis 0.1 C 99.9 C 2.0 C Cycle Time Function: To set cycle Time in 1 sec 99 sec 20 sec (differential) Activated in On- seconds.

  • Page 4: To Lock Keypad

    Description of parameters and functions. Description of parameters and functions. Range Range Parameter setting Parameter setting Sr.No. Parameter Sr.No. Parameter Fact. Fact. method. method. Keypad Function: To lock keypad. Example : Setting this Lock parameter at 20.0 C will not allow the set point to go To change Use UP/DOWN keys to set...

  • Page 5: Wiring Diagram

    15 mm WIRING DIAGRAM SZ-7081 34.5 87 mm SHORT FOR 2 WIRE RTD RELAY 230V 12 V 70.5 Phase Neutral RLY SSR 8888 SZ-7081 Installation : Fixing and dimensions of panel models: Notice: The information in this document is subject to change in...
  • Page 6 OUR OTHER PRODUCTS INDIA Cold Room Controller Chiller Controller Two Compressors Controller Heating Controller Humidity Controller Pressure Controller Ball Valves Globe Valves Hand Valves Flow Switches Solenoid Valves 00 / 15.03.10...

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