Bradford White S-DW2-U65T6FRN User Manual

INSTALLATION INSTRUCTION - SUPPLEMENT SHEET

HEATING WITH THE SOLAR WATER HEATER WITH GAS BACKUP

POTABLE AND SOLAR HEATING CONNECTIONS

The heat exchanger interior has been designed for non-potable water, such as in a solar heating system. If
replacing an existing water heating appliance, be sure to turn off electrical power, heating fluid and/or gas
supply to the existing appliance.

The solar thermal system connections are identified on the side of the appliance. The use of shut off valves and
unions are recommended for future service convenience. In solar heating systems that are non-drainback, a
suitable expansion tank must be installed. Consult local codes for proper use, sizing and installation of an
expansion tank.
thermal expansion.

Due to the elevated operating temperature that may be obtained with the solar heating system, an ASSE
approved thermostatic mixing valve has been provided and must be installed in the potable water piping
diagram as shown in Figure 1. Directions for proper installation and adjustment are provided in the ASSE
approved thermostatic mixing valve carton.

Warning: Failure to properly install and regulate the provided ASSE approved thermostatic mixing valve may
increase the danger of scald injury and nullify the warranty.

Hotter water increases the risk of scald injury. Scalding may occur within 5 seconds at a setting of 140°F. Water
temperature over 125°F can cause severe burns or death from scalds. Children, disabled and the elderly are at the
highest risk of being scalded. Please feel the water before bathing or showering.

DO NOT operate this water heater in a closed system without provisions for controlling

DANGER

VACUUM BREAKER

SHUT-OFF VALVE

COLD
SUPPLY

THERMOSTATIC

MIXING VALVE

TEMPERED
POTABLE

Figure 1 – Thermostatic Mixing Valve Piping Diagram for Tempered Water

238-47632-00B REV 09/09

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.

TEMPERATURE AND
PRESSURE GAUGE

UNION

FULL PORT

BALL VALVE

"FROM SOLAR
COLLECTOR"

"TO SOLAR
COLLECTOR"

FULL PORT

BALL VALVE

UNION

AIR VENT

AIR SEPARATOR

PRESSURE RELIEF
VALVE (30 PSI)

EXPANSION

TANK

DRAIN VALVE

TEMPERATURE AND
PRESSURE GAUGE

DRAIN
VALVE

CIRCULATOR

FLOW CONTROL

VALVE

COLD WATER

PRESSURE
REDUCING VALVE

SUPPLY

SHUT OFF
VALVE

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.

VENTIN

VALV

DRAINBAC

TANK

UNION

UNION

FULL PORT
BALL VALVE

SIGH
GLAS

SHUT OFF

VALV

COLD

WATE

SUPPL

FULL PORT
BALL VALVE

CIRCULATO

DRAI
VALV

Figure 3 – Solar Heating with a Drainback System