1. Sarrera
The Pymeter Thermostat Controller PY-21TS is a dual-relay temperature control device designed for precise temperature management. It allows for simultaneous control of heating and cooling equipment, making it suitable for a wide range of applications including seedling germination, greenhouse temperature regulation, reptile terrariums, fermentation, and more. This manual provides essential information for the safe and effective operation of your device.
2. Segurtasun informazioa
- Read all instructions thoroughly before operating the device.
- Do not immerse the controller unit or the temperature probe in water or other liquids.
- Ziurtatu elikadura hornidura boltage matches the device's requirements (120V AC).
- Do not exceed the maximum output load of 1200W (10A) for the combined outlets.
- Mantendu gailua haurrengandik eta maskotengandik urrun.
- Deskonektatu korrontea garbiketa edo mantentze-lanak egin aurretik.
3. Produktuaren ezaugarriak
- Tenperatura kontrola: Allows presetting of temperatures to automatically activate heating and cooling equipment.
- Dual Relay System: Supports simultaneous connection and control of both heating and cooling devices.
- Bistaratzeko leiho bikoitza: Shows both the measured (PV) and set (SV) temperatures concurrently. Supports both Celsius (°C) and Fahrenheit (°F) display.
- Alarm Device: Features a beeping alarm for high temperature conditions or sensor failure, enhancing safety.
- Plug and Play: Designed for easy setup and operation across various settings and devices.
- Higher Power Output: Maximum output load of 1200W (10A).
- Funtzio aurreratuak: Includes temperature calibration and a power-on delay function to prevent frequent compressor cycling.
- Aplikazio polifazetikoak: Ideal for heat mats, heat lamps, heating pads for reptile terrariums, aquarium heaters/chillers, greenhouses, grow tents, breeding, seedling, and fermentation processes.
4. Paketearen edukia
- 1 x Pymeter Thermostat Controller PY-21TS
- 1 x Tenperatura zundaketa
- 1 x Erabiltzailearen eskuliburua (dokumentu hau)

Image: Pymeter Thermostat Controller PY-21TS with its temperature probe and power cord.
5. Konfigurazioa
- Tenperatura-zunda konektatu: Insert the metal tip of the temperature probe into the designated port on the side of the controller. Ensure it is securely connected.
- Power On the Controller: Plug the controller's power cord into a standard 120V AC electrical outlet. The display will illuminate, showing the current temperature (PV) and the set temperature (SV).
- Konektatu etxetresna elektrikoak: Plug your heating device into one of the outlets (OUT 1 or OUT 2) and your cooling device (if applicable) into the other. The controller can manage both simultaneously.

Image: The Pymeter controller connected to a heat mat for seedling germination, illustrating a typical setup.
6. Funtzionamendu-argibideak
6.1 Pantaila ulertzea
The controller features a dual display:
- PV (Prozesu Balioa): Displays the current measured temperature from the probe.
- SV (Ezarritako Balioa): Displays the target temperature or the ON/OFF temperature settings.
6.2 Setting Temperature (Heating Mode)
In heating mode, the device turns ON when the temperature drops below the ON-Temperature and turns OFF when it reaches the OFF-Temperature. For heating, the ON-Temperature must be set BEHERA than the OFF-Temperature.
- Sakatu EZARTU button once. The ON-Temperature (e.g., '1oN' for Outlet 1) will flash.
- Erabili UP or BEHERA arrows to adjust the desired ON-Temperature.
- Sakatu EZARTU again. The OFF-Temperature (e.g., '1oF' for Outlet 1) will flash.
- Erabili UP or BEHERA arrows to adjust the desired OFF-Temperature.
- Sakatu GORDE button to confirm and save your settings.
Example: For heating, if you set ON-Temp to 70°F and OFF-Temp to 75°F, the heater will turn on at 70°F and turn off at 75°F.
6.3 Setting Temperature (Cooling Mode)
In cooling mode, the device turns ON when the temperature rises above the ON-Temperature and turns OFF when it reaches the OFF-Temperature. For cooling, the ON-Temperature must be set GOIAGOA than the OFF-Temperature.
- Follow steps 1-4 from the Heating Mode instructions to adjust ON-Temperature and OFF-Temperature.
- Ensure the ON-Temperature is set GOIAGOA than the OFF-Temperature for cooling operation.
- Sakatu GORDE button to confirm and save your settings.
Example: For cooling, if you set ON-Temp to 80°F and OFF-Temp to 75°F, the cooler will turn on at 80°F and turn off at 75°F.
6.4 Tenperatura Unitatearen Hautaketa (°C/°F)
Celsius eta Fahrenheit artean aldatzeko, sakatu eta eutsi botoiari UP arrow button for approximately 3 seconds. The display will change units accordingly.
6.5 Tenperatura-kalibrazioa
The Pymeter controller is factory-calibrated for accuracy. If you suspect an inaccurate reading, you can perform a calibration using an ice-water mixture. An ice-water mixture (melting ice) should read 32°F (0°C).
- Place the temperature probe into a mixture of ice and water, ensuring the ice is melting.
- Allow a few minutes for the probe to stabilize. The reading should be 32°F or 0°C.
- If the reading is off, consult the full manual for specific calibration steps, which typically involve an offset adjustment in the settings menu.
6.6 Power-On Delay Function
This function prevents rapid cycling of compressors (e.g., in chillers) by introducing a delay before restarting after a power interruption or temperature change. This protects the equipment and extends its lifespan. The delay time can usually be adjusted in the advanced settings.
6.7 Alarma ezarpenak
The controller can be configured to sound an alarm if the temperature exceeds or falls below a set range, or if the sensor malfunctions. Refer to the detailed manual for specific steps to set high/low temperature alarm thresholds and enable/disable the sensor fault alarm.

Image: The Pymeter controller regulating temperature in a greenhouse, connected to both a space heater and an exhaust fan.

Image: The Pymeter controller providing temperature regulation for a reptile terrarium, connected to a heat lamp and a heating mat.
7. Mantentzea
- Garbiketa: Wipe the controller's exterior with a soft, dry cloth. Do not use abrasive cleaners or immerse in water.
- Zunda zaintzea: Mantendu tenperatura-sonda garbi eta hondakinik gabe. Saihestu zunda-kablea tolestea edo kaltetzea.
- Biltegiratzea: Gorde gailua leku fresko eta lehor batean erabiltzen ez duzunean, eguzki-argitik eta muturreko tenperaturetatik urrun.
- Konexioaren egiaztapena: Periodically inspect all electrical connections for wear or damage.
8. Arazoak
| Arazoa | Kausa posiblea | Irtenbidea |
|---|---|---|
| Gailua ez da pizten. | No power to the outlet; loose power cord. | Check the power outlet with another device. Ensure the controller's power cord is fully inserted. |
| Appliance (heater/cooler) not activating. | Incorrect ON/OFF temperature settings; appliance not plugged in or faulty. | Verify ON-Temp and OFF-Temp settings are correct for heating/cooling mode. Ensure appliance is properly plugged into the controller and is functional. |
| Tenperaturaren irakurketa okerra. | Sensor dirty or damaged; need for calibration. | Clean the sensor. Perform temperature calibration using an ice-water mixture (refer to section 6.5). |
| Alarm beeping continuously. | Temperature outside set alarm limits; sensor fault. | Check the current temperature and compare it to your alarm settings. Inspect the sensor connection and cable for damage. |
9. Zehaztapenak
- Eredua: PY-21TS
- liburukiatage: 120 Volt AC
- Gehienezko irteerako karga: 1200 W (10 A)
- Operating Temperature (Device): Gehienez 210 °F (99 °C)
- Produktuaren neurriak: 8.26"L x 2.16"Z x 1.57"A (210 mm x 55 mm x 40 mm)
- Elementuaren pisua: 16 ontza (kilo 1)
- Bistaratzeko mota: LCD edo LED
- Kolorea: Zuria
10. Bermea eta Laguntza
Pymeter products are designed for reliability and performance. For specific warranty details, technical support, or service inquiries, please refer to the warranty card included with your purchase or visit the official Pymeter website. Please have your model number (PY-21TS) and purchase information ready when contacting support.