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8
9
AIR
CUSHION
AIR
CUSHION
AIR
CUSHION
EXPANDED WATER
This is easily accom-
plished by adding an
expansion tank with a
sealed-in, compressible
air cushion, which will
compress as thermal
expansion occurs, pro-
viding the place for the
expanded volume of
water to go during
recovery.
By sizing the air cushion
according to Boyle's
Law, we can select
the maximum pressure
on the system when
the total amount of
expanded water has
been generated.
When hot water is used
in the system, the pres-
surized air cushion
forces hot water back
into the system for use,
not waste.
The thermal expansion tank features the sealed-in air
cushion, pre-charged to the minimum system pres-
sure before recovery is started. A rugged butyl
diaphragm seals in the air cushion and also separates
air from hot domestic water to prevent air from being
dissolved by hot system water.
Finally, on the water side of the expansion tank is a
separate, rigid polypropylene liner so fresh, corrosive,
domestic hot water can be handled without fear of
corrosion and leaks.
1. System
Connection
2. Separate, rigid
polypropylene-
lined water
reservoir (NSF
listed)
3. Heavy-duty
butyl diaphragm
4. Sealed-in,
permanent air
charge
5. Welded steel
pressure sup-
port domes
6. Air charging
valve