Bradford White S-DW2-U65T6FRN - Manual (Page 2)

SOLAR HEATING WITH A CLOSED, FILLED SYSTEM
1) Pipe the system as shown in figure 2.
2) Install a properly sized expansion tank. An air separator and vent is recommended to eliminate air in
the system. The pressure relief valve should be piped to discharge within 6” from the floor.
3) A pressure reducing valve is recommended for installation to maintain appropriate pressure in the
closed loop system.
4) The circulator should be installed to pump away from the expansion tank as shown.
5) Purge all air from the filled, closed system.
Figure 2 – Solar Heating with a Filled, Closed System
SOLAR HEATING WITH A DRAINBACK SYSTEM
1) Pipe the system as shown in Figure 3.
2) The pump should be installed to pump away from the lower heat exchanger connection.
3) Verify that all check valves are removed from the system and that all horizontal piping has at least a
1/4” per foot slope.
4) Fill the system until the water level is observed in the sight glass.
SIGH
GLAS
DRAINBAC
TANK
VENTIN
VALV
SHUT OFF
VALV
WATE
SUPPL
COLD
CIRCULATO
FULL PORT
BALL VALVE UNION
UNION
FULL PORT
BALL VALVE
DRAI
VALV
DRAIN
VALVE
FLOW CONTROL
VALVE
CIRCULATOR AIR VENT
AIR SEPARATOR
PRESSURE RELIEF
VALVE (30 PSI)
DRAIN VALVE
COLD WATER
SUPPLY
TEMPERATURE AND
PRESSURE GAUGE
UNION
"TO SOLAR
COLLECTOR"
"FROM SOLAR
COLLECTOR"
TEMPERATURE AND
PRESSURE GAUGE
UNION
EXPANSION
TANK
PRESSURE
REDUCING VALVE
SHUT OFF
VALVE
FULL PORT
BALL VALVE
FULL PORT
BALL VALVE
Figure 3 – Solar Heating with a Drainback System