Instruction manual

DRAWING #2
T
he reverse storage tank system,
drawing #2, is a variation on the
typical system discussed previously
and is intended for use in an
installation with only occasional
h
igh loads. An example of this is
a church kitchen that serves a
pancake supper once a month. This
drastically reduces energy use (from
stand-by losses of the storage tank)
by allowing the storage tank to be
shut off during the times of low use.
This system brings cold water into
the bottom of the storage tank.
Water flows out the top of the
storage tank and into the cold water
inlet of the water heater. All hot
water for the facility flows out the
top of the water heater. A circulator is connected to the hot water outlet of the water heater
to draw hot water back into the storage tank. In times of low hot water use this pump can be
turned off by a switch or timer preventing the storage tank from being heated. A check valve
is also used as in the other systems to prevent cold water from diluting the hot water stream.
DRAWING #3
Drawing #3 shows a storage tank
connected to a boiler. This system
is essentially the same as the typical
system shown in drawing #1. The
only significant difference is the
heat source. In this configuration
cold water is free to enter the
storage tank through the bottom
fitting or by flowing through the
boiler before entering the storage
tank. No check valve is used.
HOT OUT
HEATER
WATER
COLD IN
FOR PUMP
AQUASTAT
TANK
STORAGE
PUMP
CIRCULATING
VALVE
CHECK
SWITCH
ON/OFF
TEMPERATURE
CONTROL
TANK
STORAGE
OUT
HOT
COLD
IN
BOILER
PUMP
Page 6 Storage Tanks