Quick Answer
To connect multiple collectors in a drainback system, run a dedicated drainback loop from each collector back to the tank, with a check valve at the tank end to prevent backflow. Use a common manifold for the collectors, with individually metered flow rates for each collector. A system controller can be used to monitor and control individual collector temperatures.
Selecting the Right Fittings and Valves
When connecting multiple collectors in a drainback system, the selection of the right fittings and valves is crucial to prevent system failures and ensure optimal performance. Use 1-inch (25mm) or 1.5-inch (38mm) copper or PEX tubing for the drainback loops, with 3/4-inch (19mm) or 1-inch (25mm) fittings for the collector connections. Install check valves at the tank end of each drainback loop, with a minimum pressure rating of 100 psi (689 kPa) and a maximum flow rate of 10 gpm (38 l/min).
Collector Manifold Design and Layout
The collector manifold should be designed to evenly distribute the system flow rate among the collectors, with individually metered flow rates for each collector. A balanced manifold design can be achieved using a manifold with 3/4-inch (19mm) or 1-inch (25mm) flow control valves for each collector. The manifold should be located near the collectors to minimize the length of the drainback loops and reduce the risk of freeze damage. A system controller can be used to monitor and control individual collector temperatures, with alarm functions to alert the system operator to any issues.
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