Dunkirk H2OI Stainless Steel Dual Coil Solar Water Heaters - Manual (Page 14)

14
SOlAR pIpING
Hot Water Recirculation
Hot Water Recirculation for Solar Hot Water Storage Tanks
Hot water recirculation is for the continuous circulation of hot water for
instant hot water at the hot water faucets. Solar tank tappings provide
hot water recirculation return at the distance mid-height at the side of
the tank. See Figure 8. Location of tapping will not allow for mixing of
back-up heated hot water (boiler indirect of electric element) into lower
solar heated section of the tank.
When an anti-scald device is installed it is critical to feed cold supply of
mixing valve with return of recirculated hot water. This is important to
keep hot water recirculation loop operating through the mixing valve
even if tank temperatures are above mixing valve setting. Other wise
the mixing valve will not allow flow of hot water though it and disable
recirculation loop of hot water.
Hot Water Can Scald!
Water heated to temperature for
clothes washing, dish washing and
other sanitizing needs can scald and
cause permanent injury.
Children, elderly, and infirm or
physically handicapped persons are
more likely to be permanently injured
by hot water. Never leave them
unattended in bathtub or shower. Never
allow small children to use a hot water
tap or draw their own bath.
• If anyone using hot water in the
building fits the above description,
or if state laws or local codes
require certain water temperatures
at hot water taps, you must take
special precautions:
• Use lowest possible temperature
setting.
• Install some type of
tempering device, such as an
automatic mixing valve, at
hot water tap or water heater.
Automatic mixing valve must
be selected and installed
according to manufacturer's
recommendations and
instructions.
Water passing out of drain valves may
be extremely hot. To avoid injury:
• Make sure all connections are tight.
• Direct water flow away from any
person.
Pipe Relief Valve
Discharge to within
6" of floor, see
Section III Notes.
FIGURE 8