# Power-On Hydro Equipment Guide > Safe startup sequence for hydro equipment, from coolant circulation to staged ASIC energizing and first-run monitoring. Canonical: https://miningstore.com/mining-services/hydro-cooled-bitcoin-mining-guide/power-on-hydro-equipment-guide/ Last updated: 2026-07-12 [Back to Hydro Guide]() Deployment Guide Support Article 6 min read ## Power-On Hydro Equipment Guide A methodical startup process reduces thermal shock, avoids pressure imbalance, and catches leaks or electrical issues before they cost you uptime. Startup order **Water loop first, miners second** Pressure target **\<=3.5 bar** Critical window **First 72 hours after energizing** ## On This Page 1. [Step 1: Pre-Power-On Safety Checks]() 2. [Step 2: Prepare the Water System]() 3. [Step 3: Energize the Electrical System]() 4. [Step 4: Stabilize and Document the Run]() 5. [Safety Protocols That Travel with Every Restart]() ## Keep Moving - [Hydro Guide Hub]() - [Hydro Mining Deployment Checklist]() - [Antminer S21 XP Hydro Manual]() - [Troubleshoot Hydro Miners]() Improper startup procedures create avoidable stress on hydro boards, pumps, seals, and electrical infrastructure. The safest rollout is a staged one. The startup sequence stays simple: verify the site, circulate the fluid, energize the electrical system in batches, then stabilize and monitor. ## Key Takeaways - Do not energize ASICs until the cooling loop is circulating and air has been bled from the system. - Power miners in small batches so you can identify abnormalities before they cascade through the site. - Treat the first 72 hours as a monitored stabilization period, not a finished handoff. Deployment ## Step 1: Pre-Power-On Safety Checks - Inspect water hoses, fittings, and electrical cables for secure terminations and visible damage. - Confirm coolant level, pH, and conductivity before the pump ever starts. - Verify environmental conditions are suitable and that service clearances remain accessible during startup. Deployment ## Step 2: Prepare the Water System 1. Open inlet and outlet valves and confirm bleed points are accessible. 2. Start the coolant pump without powering the ASICs and watch the pressure rise gradually. 3. Bleed trapped air until the loop reaches the target 8.0-10.0 L/min flow range with stable pressure. ### What not to do Do not energize miners to 'help diagnose' a coolant issue. Startup faults are easier and safer to isolate while the ASIC load is still offline. Deployment ## Step 3: Energize the Electrical System - Switch on the PDU only after confirming stable 380-415V three-phase supply and proper grounding. - Bring miners online one at a time or in small batches so you can watch startup behavior in real time. - Monitor coolant temperature, pressure, and miner dashboard telemetry as each batch joins the loop. Deployment ## Step 4: Stabilize and Document the Run - Adjust valves as needed so pressure and flow remain balanced across the fleet. - Inspect for leaks, vibration, unusual motor noise, or sensor failures once miners are active. - Log startup pressure, temperature, power draw, and early hashrate behavior for the first 72 hours. Deployment ## Safety Protocols That Travel with Every Restart - Follow the equipment manual and wear insulated PPE around live electrical and pressurized fluid systems. - Keep cords and electrical devices clear of standing water and use GFCI protection where appropriate. - Never leave a startup sequence unattended, and keep fire extinguishers plus emergency shutdown access ready. - Train every operator on hazard recognition, emergency response, and cabinet-level shutdown points. Next Steps ## Related Hydro Resources - [Return to the Hydro Guide Hub]() - The parent page connects deployment, operations, procurement, and strategy resources in one place. - [Hydro Mining Deployment Checklist]() - Five-phase planning and pre-launch audit for hydro-cooled site buildouts. - [Antminer S21 XP Hydro Manual]() - Operating limits, startup thresholds, and maintenance notes for S21 XP Hydro deployments. - [Troubleshoot Hydro Miners]() - Quick triage for hashrate drops, flow issues, leaks, pump faults, and escalation triggers. ## Related - [Back to Hydro Guide]() - [Hydro Mining Deployment Checklist]() - [Antminer S21 XP Hydro Manual]() - [Troubleshoot Hydro Miners]()