1. Entwodiksyon
This manual provides comprehensive instructions for the installation, operation, and maintenance of the Sub-Zero SZ-7501 Digital Process Controller/Temperature Indicator. This device is designed for precise temperature control across a wide range of applications, including incubators, water heaters, floor heating systems, aquariums, refrigerators, greenhouses, and various industrial cold storage facilities.
The SZ-7501 is a versatile thermostat sensor capable of operating within a 110V-220V power supply, offering both cooling and heating output functionalities.
2. Karakteristik kle
- Cooling & Heating Output: Supports both heating and cooling modes for flexible temperature management.
- Lajè ranje tanperati: Operates effectively from -50°C to +99°C.
- Retansyon memwa: Kenbe paramèt yo menm apre yon pann kouran.
- Pwoteksyon Compression: Features a time delay function to protect connected compressors.
- Relè Sòti: SZ – 7510 P – 8 (3) A for reliable switching.
- Pwovizyon pou pouvwa: Compatible with 230VAC power sources.
3. Pwodwi souview
The Sub-Zero SZ-7501 features a clear digital display and intuitive control buttons for easy operation.

Figi 1: Devan view of the Sub-Zero SZ-7501 Digital Process Controller. The display shows "25°C" with indicators for cooling, alarm, and a clock. Control buttons include 'Up', 'RST', 'PRG', 'Down', and 'SET'.

Figi 2: Side view of the Sub-Zero SZ-7501 controller, illustrating the compact design and the connected sensor chord. The transparent purple casing reveals internal components.
4. Enstalasyon ak Enstalasyon
Proper installation is crucial for the accurate and safe operation of the SZ-7501 controller. Ensure all power is disconnected before proceeding with installation.
4.1 Dyagram Fil elektrik (Gid Jeneral)
While a specific wiring diagram is not provided in this manual, typical connections for a digital temperature controller include:
- Pwovizyon pou pouvwa: Connect the 230VAC power input to the designated terminals. Refer to the label on the device for exact terminal identification.
- Koneksyon Capteur: Connect the temperature sensor chord to the sensor input terminals. Ensure a secure connection for accurate readings.
- Load Output (Heating/Cooling): Connect your heating or cooling device (e.g., compressor, heater) to the relay output terminals. Observe polarity and maximum current ratings.
Atansyon: Incorrect wiring can damage the device or connected equipment and poses an electrical hazard. If you are unsure about wiring, consult a qualified electrician.
4.2 Montaj
The controller is designed for panel mounting. Ensure adequate ventilation around the unit to prevent overheating. Cut an appropriate opening in the panel and secure the controller using the provided clips or mounting hardware.
5. Operasyon Enstriksyon
The SZ-7501 controller features a user-friendly interface for setting and monitoring temperature.
5.1 Power On/Off
Connect the device to a 230VAC power source. The display will illuminate, showing the current temperature.
5.2 Setting the Desired Temperature (Set Point)
- Peze a SET button once. The display will flash, showing the current set point temperature.
- Sèvi ak la LEVE (▲) epi DESANN (▼) buttons to adjust the set point to your desired temperature.
- Peze a SET button again to confirm and save the new set point. The display will return to showing the current temperature.
5.3 Programming Parameters (PRG)
La PRG button is used to access advanced settings such as temperature differential (hysteresis), compressor delay time, and calibration. Specific parameter codes and their functions are typically detailed in a separate programming guide or on the device itself.
- Peze epi kenbe la PRG button for several seconds to enter programming mode.
- Sèvi ak la LEVE (▲) epi DESANN (▼) buttons to navigate through the parameter codes (e.g., F1, F2, F3).
- Peze SET pou view the value of a selected parameter.
- Sèvi ak LEVE (▲) epi DESANN (▼) to modify the parameter value.
- Peze SET pou konsève pou nouvo valè a.
- Peze epi kenbe PRG again, or wait for a timeout, to exit programming mode.
Nòt: Refer to the specific parameter list for your model to understand each setting's function and appropriate range.
5.4 Reset Function (RST)
La RST button is typically used to reset alarms or to initiate a manual defrost cycle in certain applications. Consult the device's specific functionality for its exact use.
6. Antretyen
Regular maintenance ensures the longevity and accurate performance of your Sub-Zero SZ-7501 controller.
- Netwayaj: Siye ekran an epi casinSiye ak yon twal mou epi sèk. Pa sèvi ak pwodui netwayaj abrazif oswa solvan.
- Swen Capteur: Ensure the temperature sensor is clean and free from debris. Avoid bending or damaging the sensor chord.
- Koneksyon: Tcheke tout koneksyon elektrik yo detanzantan pou wè si yo sere epi si gen siy korozyon.
- Anviwònman: Operate the controller within its specified environmental conditions (temperature, humidity) to prevent damage.
NAN. Depanaj
This section addresses common issues you might encounter with your SZ-7501 controller.
| Pwoblèm | Kòz posib | Solisyon |
|---|---|---|
| Ekspozisyon an vid | No power supply; loose connection; internal fault. | Check power connection (230VAC). Verify wiring. If problem persists, contact support. |
| Lekti tanperati ki pa egzak | Sensor faulty; sensor not properly placed; calibration error. | Check sensor connection and placement. Ensure sensor is not damaged. Consider recalibration if available in PRG settings. |
| Controller not switching load (heating/cooling) | Incorrect set point; faulty relay; wiring error; compressor delay active. | Verify set point and temperature differential. Check load wiring. Wait for compressor delay to expire. |
| Alarm indicator active | Temperature outside set limits; sensor error. | Check current temperature and set limits. Verify sensor functionality. Press RST to clear alarm. |
8. Espesifikasyon
| Nimewo Modèl | SZ-7501 |
| Mak | Sub-Zero (Manufacturer) |
| Pwovizyon pou pouvwa | 230VAC (110V-220V compatible) |
| Ranje Tanperati | -50°C pou +99°C |
| Sòti relè | SZ – 7510 P – 8 (3) A |
| Dimansyon pwodwi (LxWxH) | 9 x 4 x 9 cm |
| Pwa atik | 62 g |
| Koulè | Nwa ak Vyolèt |
| Peyi orijin | peyi Zend |
9. Garanti ak sipò
For warranty information and technical support, please refer to the documentation provided with your purchase or contact the retailer. Keep your purchase receipt as proof of purchase.
Pou plis asistans, ou ka vizite tou manifakti a. websit oswa kontakte depatman sèvis kliyan yo.





