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14
Water Connections continued-
2. For a drainback solar heating system, refer to Figure 4. The solar water heater connection labeled “FROM
SOLAR COLLECTOR” should be piped to the solar collector supply piping. Mount the circulator making sure
the flow arrow points toward the water heater. The use of shut-off valves and unions are recommended for
future service convenience. Pipe and fittings between the solar collector and solar water heater must be ¾”
diameter or larger. The piping or drainback tank must have a site glass located at a level above the circulator and
water heater.
Figure 4 - Solar Collector Piping in Drainback Installation
FILL SOLAR COLLECTOR SYSTEM
1. Fill solar heating system appropriately with water or a propylene glycol/water mix.
2. Verify pump flow and direction. In a closed loop system, purge all air from the collector/water heater piping.
3. Check system for leaks. Repair as necessary.
a. In a closed loop system, check for leaks when flow is stopped and the operating pressure is maintained.