AEC FSS Series 1.5- 10 HP Fountain Solution Systems - Manual (Page 38)

FSS Series Fountain Solution Systems Page 37
IAE-600
4 Sequence of Operation
4-1 Solution Circuit
Cooling water To Process and From Process connections are
made at the hose barbs provided outside the unit. Warm solution
(water and chemical mixture) returns from the process and goes
into the reservoir tank. The coolant is then pumped through the
evaporator where it is cooled. The coolant flows to the process and
returns to repeat the cycle.
A process water bypass located between the supply line and
reservoir tank allows minimal flow through the unit during
intermittent fluctuating flow conditions. It is not intended to
provide continuous full bypass flow.
This minimal flow allows the temperature sensor to signal the
controller to shut down the compressor because of the drop in
process water temperature. Typically the flow switch shuts down
the chiller in this low flow condition.
4-2 Refrigeration Circuit
FSS Series circulators are available with air-, water-, or remote air-
cooled refrigerant condensing. The refrigeration cycles differ only
in the way the compressed gas is condensed to a liquid.
Liquid refrigerant from the condenser heat exchanger flowing in
the liquid line passes through a shutoff valve into a filter/dryer that
removes moisture and other contaminants. A refrigerant sight glass
is provided. The refrigerant then passes through the thermal
expansion valve which allows the refrigerant to expand (boil off),
and cool the fluid inside of the evaporator. The refrigerant gas
flows through the suction line back into the compressor.