Sub-Zero SZ-7081 User Manual

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:
J type thermocouple : 0 C 0 C
type thermocouple : 0 C C
C C
C C
O O
to 70
O O
K to 999
O O
2 Wire RTD : -99 to 850
O O
3 Wire RTD : -99.9 to 99.9
OPERATING
INSTRUCTIONS
SZ-7081
INDIA
www.ascontrols.com
INDEX
To set cycle Time in seconds. Activated in Proportional
mode only.
To set relay mode as per application.
Parameter
Parameter setting
method.
To set Cutout value of the Controller.
To select the type of sensor.
To select type of output.
To set Control Action of Output.
To set Hysterisis (differential). Activated in On-Off mode
only.
To set Proportional Band. This parameter is activated in
Proportional Mode only.
To set Time Delay. This parameter is activated in On-Off
Mode only.
To set manual offset for proportional band. Activated in
Proportional mode only.
To set maximum limit for set point as per the sensor
selected.
To set minimum limit for set point as per the sensor
selected.
To set Probe calibration.
To restore default settings.
To end programming.
To lock keypad.
To display set point. The Set point can not be changed but
can only be viewed in this mode.
Operating Messages
Technical Data
Wiring Diagram
Panel cutout & Installation
Pg. No.
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Sub-Zero SZ-7081 Specifications

General

Brand	Sub-Zero
Model	SZ-7081
Category	Temperature Controller
Language	English

Summary

General Description

Controller Features and Applications

Details the SZ-7081 as a single setpoint temperature controller with heating/cooling modes and protection features.

Parameter Settings and Functions

Sensor Type Configuration

Sets the type of sensor (J type thermocouple, K type thermocouple, RTD) for accurate readings.

Output Type and Relay Mode

Configures the controller's output type (Relay/SSR) and relay mode (Heating/Cooling).

Control Action and Proportional Band

Defines the control action (On-Off/Proportional) and the Proportional Band for temperature regulation.

Hysterisis and Cycle Time Settings

Adjusts Hysterisis (differential) for On-Off mode and Cycle Time for Proportional mode.

Manual Offset and Time Delay

Applies manual offset to the proportional band and sets time delay for compressor protection.

Set Point Limits and Probe Calibration

Sets maximum/minimum limits for set points and calibrates the temperature probe.

Keypad Lock and Default Settings

Enables keypad lock for security and restores controller to default factory settings.

Operating Information and Technical Data

Operating Messages and Status

Explains messages displayed by the controller (HE, LE, SF) indicating temperature status.

Technical Specifications Overview

Provides key technical data including dimensions, power input, accuracy, and operating conditions.

Installation, Wiring, and Safety

Wiring Diagram and Panel Installation

Illustrates the wiring connections and provides guidelines for panel cutout and unit fitting.

Controller and Probe Installation Guidelines

Advises on proper installation locations for the controller and probe to ensure optimal performance.

Important Cautions and Warnings

Highlights critical safety precautions related to wiring, maintenance, and potential hazards.