This solar thermal service checklist helps technicians and facility teams assess and maintain solar hot water systems. Verify collector installation and penetrations, controller and electrical compliance, pump station mounting, and correct sensor placement. Check the solar-rated expansion vessel, capacity and set pressure, recharge if needed, purge air, confirm flow rate, and record system and hot water temperatures. Capture glycol concentration, system pressure, relief valve rating and discharge location. Note defects, attach photos, and collect customer feedback to ensure safe, efficient operation.
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