Specifications

Multiplex Company, Inc.
Component Parts Workbook
3
00218011 Revision B (KAK) 31 July, 2000
Accumulator Tank Pressures
Accumulator tanks have a rubber diaphragm in the middle of the steel tank, air is stored on one
side of the diaphragm and water is stored on the other side, a plastic liner protects the steel from
rust. Multiplex uses accumulator tanks for several purposes:
Water booster tank
A water booster pump is used to increase the incoming water pressure to 65psi (4.5bar) to 85psi
(6.0bar). We then store that higher pressure water in an accumulator tank. As a result, the pump
isnt running every time water is needed. The air in the tank gives the water a nice push out of the
tank so that the water pressure slowly drops, allowing the pump to cycle on run for a short period of
time and then cycle off. The air charge of this tank should be 60psi (4.1bar) to 65psi (4.5bar).
Filtered water accumulator tank
Filtered water is stored in an accumulator tank to be used when the carbonator pumps demand
more water than will flow through your restricted water filters, and then slowly refill the tank when
the pumps shut off. This enables you to use your filters for a longer period of time. The air
charge of this tank should be 15psi (1.0bar) to 20psi (1.4bar).
The air charge in the tank should be filled or checked with no water pressure to the tank,
because once you have water pressure applied to the tank the air will compress and equalize with
the water pressure and you will get a false reading.
It is very important to use air and not CO
2 to charge the tank, because CO2 will eventually bleed
through the rubber diaphragm, thus reducing the charge in the tank.
On the bigger WX103 tank, when used as a water booster tank, it is critical to have the 60psi
(4.1bar) to 65psi (4.5 bar) air charge, because if the air pressure drops below 45 psi (3.1 bar), the
diaphragm will break.
S12196