How to Operate the Korean 15KG THCR-12 Proaster Coffee Roaster

If you’re learning to roast on a commercial 15-kilogram machine—especially one from outside your usual market—you want clear, accurate info on setup, roast profiles, and critical safety steps. The 15KG THCR-12 by South Korea’s Proaster is a serious drum roaster used in both specialty and production environments. But without the right operational guidance, even experienced roasters can make avoidable mistakes.

The 15KG THCR-12 coffee roaster by Korean brand Proaster requires attention to drum speed, gas pressure, inlet/outlet air temps, and cooling time. Key operational specs include a typical charge temp of 160–180°C, roast times of around 11–15 minutes, and a cooling cycle of under 5 minutes. Below is a full guide covering setup, roasting steps, machine care, and common pitfalls.

What Is the Proaster THCR-12?

The THCR-12 is a 15-kilogram capacity drum coffee roaster manufactured by Proaster, a South Korean roasting equipment brand. It is designed for specialty-grade and small-batch commercial roasting. The machine features a front-mounted control panel, adjustable drum rotation speed, digital temperature controls, gas heating, and a built-in cooling tray. Its compact footprint relative to batch size makes it suitable for mid-volume roasting operations and specialty-focused roasters looking for precise control over roast development.

Key Technical Specifications

The 15KG THCR-12 has the following core specifications:

• Batch Capacity: 15 kilograms green coffee
• Drum Material: Stainless steel
• Heating: Gas-fired
• Control Panel: Digital, front-mounted
• Drum Rotation Speed: Adjustable
• Cooling System: Integrated forced-air cooling tray
• Typical Charge Temperature Range: 160–180°C
• Roast Duration: Approximately 11–15 minutes
• Cooling Time: Under 5 minutes

How to Operate the THCR-12 Roaster

Operating the THCR-12 involves several precise steps to ensure safe and consistent roasts. Follow this workflow for best results:

1. Preheating: Turn on the roaster and allow the drum and roasting chamber to preheat. Set your charge temperature between 160–180°C depending on the coffee origin and desired roast level.
2. Loading Green Coffee: Once the target charge temp is reached, load 15 kilograms of green coffee evenly into the drum. Avoid overfilling or uneven distribution.
3. Initial Roast Phase (Drying): The coffee will go through an initial drying phase where moisture evaporates. Monitor the exhaust air temperature and adjust gas pressure to maintain a steady rise in temp.
4. Maillard Reaction & Development Phase: As the roast progresses, focus on the Maillard reaction window (usually between 1:00–3:00 into the roast). Adjust drum speed and airflow to balance heat application and development.
5. First Crack & Roast Termination: Listen for first crack, typically occurring around 8–11 minutes into the roast. Decide your roast level (light, medium, dark) and end the roast accordingly, usually 11–15 minutes total.
6. Cooling: After dropping the batch, the integrated cooling tray will activate. Cooling should take under 5 minutes to stabilise bean temperature and halt further development.

Important Operating Notes & Safety

To operate the THCR-12 safely and effectively, observe these guidelines:

• Always preheat the machine fully before loading coffee.
• Ensure proper ventilation in the roasting area due to gas heating and chaff emissions.
• Monitor gas pressure consistently during roasting—do not let it fluctuate drastically.
• Check and clean the cooling tray and chaff collector after every batch.
• Inspect the drum and belts regularly for wear, especially if running multiple batches daily.
• Keep a log of charge temp, roast time, airflow settings, and cooling duration for each batch.

Frequently Asked Questions

What is the batch size for the Proaster THCR-12?

The THCR-12 is designed for a 15-kilogram batch of green coffee. Do not exceed this limit as it can affect heat distribution and roast consistency.

What charge temperature should I use on the THCR-12?

A typical starting charge temperature is between 160–180°C. Adjust based on coffee origin and whether you're aiming for a light, medium, or dark roast profile.

How long does a roast take on the THCR-12?

Most roasts on the 15KG THCR-12 take between 11–15 minutes from charge to drop, depending on roast level and coffee type.

How long does cooling take on the THCR-12?

The integrated cooling system cools the batch in under 5 minutes. Ensure the cooling tray is functioning properly to stop over-development.

Does the THCR-12 require gas or electricity for heating?

The THCR-12 uses gas-fired heating. Ensure proper gas pressure and ventilation when operating the machine.

Is the THCR-12 suitable for specialty coffee roasting?

Yes, the THCR-12 is suitable for specialty coffee roasting, especially when operated with precise control over temperature, airflow, and roast timing.

Recommended FrontStreet Coffee for the THCR-12 Roaster

For the 15KG THCR-12 roaster, try FrontStreet Coffee’s Ethiopia Humbera for vibrant floral and citrus notes, or Yirgacheffe for juicy berry and stone fruit layers—both shine when roasted with precision control. For a deeper profile, their PWN Golden Mandheling offers classic Indonesian body with sweet spice and cedar. These single origins respond well to the THCR-12’s airflow and drum speed adjustments. Freshly roasted within 5 days · Orders placed before 17:00 ship the same day · Next-day delivery across most of Guangdong Province.