The Subzero SZ-7521-P is a compact digital temperature controller designed for commercial refrigeration, HVAC systems, and general temperature control applications. With NTC sensor support, accurate readings, and dual relay outputs, it ensures stable temperature regulation for chillers, coolers, freezers, and cabinets.

Key Features

• NTC sensor input for accurate temperature measurement

• Cooling/Heating mode selection

• Dual relay outputs (Compressor + Alarm/Defrost)

• LED temperature display

• Adjustable high/low temperature alarms

• Compact panel mount design

• Power-on/off memory retention

• Wide operating temperature range

• Simple 3-key programming interface

• Robust design suitable for commercial and industrial use

Technical Specifications

Applications

• Deep freezers

• Display counters

• Water chillers

• Cold rooms

• Ice cream freezers

• Drug storage cabinets

• Commercial refrigeration units

• Industrial process temperature control

What’s in the Box

• Subzero SZ-7521-P Temperature Controller

• NTC Sensor (if supplied)

• User Manual

• Mounting clamps

FAQ

Q1. What type of sensor does the SZ-7521-P support?

It supports standard NTC sensors for precise temperature measurement.

Q2. Can this be used for both cooling and heating applications?

Yes. The controller supports cooling/heating mode selection.

Q3. Does it have an alarm output?

Yes, it includes a dedicated alarm relay for high/low temperature alerts.

Q4. What is the operating voltage?

It operates on 230V AC.

Q5. Is it suitable for deep freezer applications?

Yes, it is widely used for freezers, coolers, chillers, and commercial refrigeration.

Q6. Does it retain settings after power failure?

Yes, it supports memory retention and does not lose programmed parameters.