Subzero SZ-7521-P
Subzero SZ-7521-P Digital Temperature Controller
Compact temperature controller with NTC input, dual relay outputs, and precise cooling/heating control for commercial refrigeration and HVAC systems.
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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
| Parameter | Details |
|---|---|
| Model | SZ-7521-P |
| Sensor Input | NTC |
| Display | LED digital |
| Operating Voltage | 230V AC |
| Temperature Range | –40°C to +99°C |
| Control Mode | Cooling / Heating |
| Relay Output | Compressor + Alarm |
| Alarm Types | High/Low + Sensor Error |
| Mounting | Panel Mount |
| Dimensions | 76×34 mm (front) |
| Power Consumption | <3W |
| Protection | Sensor error protection |
| Memory | Parameter retention on power-off |
| Brand | Subzero |
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.
Controllers for Refrigeration
- Display:7 Segment LED Display, 2 x 14.2mm (0.56”)
- Probe Inputs:NTC
- Battery Backup:Yes
- Power Supply:230 Vac
- Size:75 x 34.5mm
- Mounting Type:Panel Mount
- Panel Output:71*29mm
- Application:Fruit Ripening System