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Antminer S21 Hydro: Master Your Investment

Essential Operating Guide for Peak Performance & ROI

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Antminer S21 Hydro Operating Manual

The Bitmain Antminer S21 XP Hydro represents a significant leap in mining efficiency, harnessing the power of hydro-cooling to achieve unparalleled hashrates and reduced energy consumption.

To fully capitalize on this advanced technology and ensure a sustained return on investment, meticulous adherence to proper operating procedures is paramount.

This comprehensive guide provides technicians with the essential knowledge for seamless deployment, optimal performance, and long-term stability of the S21 XP Hydro within hydro-cooled mining environments.

1. Hardware Overview

Model: Antminer S21 XP Hydro (473Th/s)
Manufacturer: Bitmain
Algorithm: SHA-256 (supports BTC, BCH, BSV)

Key Specifications:

Feature	Specification
Hashrate	473 TH/s
Power Consumption	5,676W @ 35°C
Efficiency	12 J/TH
Cooling System	Hydro-cooling (closed-loop)
Noise Level	50 dB
Dimensions (L×W×H)	410 × 170 × 209 mm
Weight	12.3 kg (net) / 13.6 kg (gross)
Input Voltage	380–415V AC (3-phase)
Network Interface	RJ45 Ethernet (10/100M)

2. Startup Procedures

Pre-Installation Checklist

1. Power Requirements:

Ensure a 3-phase power supply (380–415V) with a 30A circuit.
Use a certified PDU (Power Distribution Unit) and C20 power cable.

2. Cooling System Setup:

Connect hydro-cooling lines to DN10 (OD10 mm) connectors.
Use deionized/pure water or antifreeze (pH 8.5–9.5).
Verify coolant flow rate: 8.0–10.0 L/min at ≤3.5 bar pressure.
Ensure inlet coolant temperature: 20–50°C.

3. Environment:

Operating temperature: 20–50°C.
Humidity: 10–90% (non-condensing).
Ventilation: Ensure adequate airflow around the unit.

3. Installation and Configuration

Step 1: Physical Setup

Mount the miner in a dust-free, vibration-resistant location.
Connect hydro-cooling lines and power cables securely.

Step 2: Network Configuration

Connect the Ethernet cable to the RJ45 port.
Access the miner’s IP via Bitmain’s Antminer Configuration Tool or router interface.

Step 3: Mining Pool Setup

Log in to the miner’s web interface (default IP: 192.168.1.1).
Navigate to Miner Configuration > Pool Settings.
Add pool details (example for ViaBTC):
- URL: stratum+tcp://btc.viabtc.com:25
- Worker: your_username.worker_name
- Password: x

4. Operating Guidelines

Daily Monitoring

Dashboard Metrics: Track real-time hashrate, temperature, and power usage via the web interface.
Coolant Health: Check for leaks, flow rate stability, and pH levels weekly.

Maintenance Schedule:

Task	Frequency	Action
Coolant Replacement	Annually	Flush system, refill with fresh coolant
Filter Cleaning	Monthly	Clean inlet/outlet filters
Firmware Updates	Quarterly	Download updates from Bitmain’s site
Fan Inspection	Quarterly	Test fan speed, replace if noisy

5. Safety and Compliance

Electrical Safety:

Always ground the unit (resistance ≤0.3Ω).
Use fire extinguishers rated for electrical fires nearby.

Coolant Handling:

Wear gloves when handling antifreeze.
Dispose of coolant per local environmental regulations.

Noise Control:

Deploy in sound-dampened enclosures if noise exceeds 65 dB.

6. Troubleshooting

Issue	Solution
Low Hashrate	Check coolant flow, firmware updates, or pool connectivity
Overheating	Verify coolant temperature ≤50°C and clean filters
Connection Errors	Reboot miner, test Ethernet cable, confirm pool URL

7. Environmental Requirements

1. Coolant Parameters

Inlet coolant temperature: 20°C to 50°C. Note: The miner cannot start if the inlet temperature is below 20°C
Coolant flow rate: 8.0–10.0 liters per minute (L/min)
Coolant pressure: ≤3.5 bar
Coolant type: Antifreeze, deionized water, or pure water
Coolant pH: 8.5–9.5
Coolant conductivity:
- Must be less than 100 μS/cm.
- When first running, it should be less than 20 μS/cm; replace fluid if above 100 μS/cm

2. Ambient & Operating Environment

Operating temperature: 0°C to 40°C (recommended), but can tolerate -20°C to 70°C for storage
Maximum ambient temperature:
- 30°C if outlet coolant is 35°C
- 40°C if outlet coolant is 45°C
- 45°C if coolant is 50°C1.
Humidity: 10% to 90% RH (non-condensing)
Storage temperature: -20°C to 70°C

3. Physical & Installation Requirements

Water pipe connector: DN10 (10 mm diameter)
Power supply: 380–415V AC, 3-phase, 50–60Hz
Network: RJ45 Ethernet (10/100M)

Summary Table

Parameter	Requirement
Inlet coolant temp.	20°C to 50°C
Coolant flow rate	8.0–10.0 L/min
Coolant pressure	≤3.5 bar
Coolant type	Antifreeze, deionized/pure water
Coolant pH	8.5–9.5
Coolant conductivity	<100 μS/cm (start: <20 μS/cm)
Operating temp.	0°C to 40°C (storage: -20°C to 70°C)
Ambient humidity	10% to 90% RH (non-condensing)
Water pipe connector	DN10 (10 mm)
Power supply	380–415V AC, 3-phase, 50–60Hz

Proper adherence to these environmental requirements is essential for safe, efficient, and reliable operation of the Antminer S21 XP Hydro.

Failure to meet these parameters can result in hardware malfunctions, reduced efficiency, or voided warranty.

8. Warranty and Support

Warranty:

365 days (void if used outside AntSpace HK3 systems).

Support:

Contact Bitmain Support or authorized resellers for repairs.

Final Notes:

Always power off the unit before maintenance.
For overclocking, gradually increase frequency while monitoring temperature and efficiency.

Consistent, high-yield operation of the Antminer S21 XP Hydro hinges on a deep understanding of its technical specifications and adherence to best practices.

While this manual equips you with the fundamental knowledge, the complexities of large-scale hydro mining deployments often necessitate specialized expertise to maximize uptime and profitability.

Why risk suboptimal performance or costly downtime due to operational oversights?

Our seasoned team offers comprehensive support, from initial setup and system integration to ongoing maintenance and performance optimization, ensuring your hydro mining investment delivers its full potential.

Partner with us to unlock peak efficiency and secure a rapid return on your S21 XP Hydro deployment.