7.3.1
Fluid Expansion Reservoir
The fluid expansion reservoir is attached to the rear panel of the bath. Its pur-
pose is to receive excess fluid expanded in the process of heating the bath to
higher temperatures. Any liquid will expand when heated. To prevent the bath
from overflowing, the excess fluid must be removed prior to heating or there
must be a means of allowing it to drain out of the bath tank. (Note: the fluid
level must never be below the heating elements). This bath has an overflow
tube attached to the bath tank that extends to the rear of the bath and drains into
the fluid expansion reservoir. The reservoir has enough capacity to cover a
large range of thermal expansion rates for different fluids. No attempt must be
made to plug the overflow tube to prevent fluid from draining. Do not attempt
to fill the bath to a level higher than the overflow tube level.
The fluid expansion reservoir is stainless steel with an aluminum heat shield to
prevent touching when the tank is hot. There is a stainless steel dust cover over
the reservoir with an elbow on top that the drain tube is inserted into. The reser-
voir hangs on a hook and is attached to the bath with a thumbscrew.
WARNING:
The drain tube and dust cover may be hot. Always be sure
the drain tube is fully inserted into the elbow of the dust cover.
To drain fluid from the reservoir, first remove the dust cover and set aside.
Then undo the thumbscrew and carefully lift it with the two handles provided
on the back. The fluid may then be poured back into the bath when it is cooler
or poured into some other approved container. Caution: Be careful when han-
dling hot fluids, burns can result. When the excess fluid has been removed, re-
verse the process to replace the reservoir and dust cover. Always wipe away
spilt fluid if spilling occurs.
WARNING:
The overflow tube is not large enough to handle large flow
rates encountered by overfilling the tank. It is intended for expanding fluid
rates from heating only. Fill only until the level reaches the top of the baf-
fle (see Figure 1 on page 13).
25
7 Parts and Controls
Back Panel
