SRC Service Manual
Revision 02
Aug 2007
3.2.3 Coolant
Tank
The coolant circuit includes an accumulation tank with the Coolant-to-
Refrigerant Heat Exchanger inside (they cannot be separated). The
tank acts as thermal energy storage, allowing the system to
accumulate a mass of chilled water/glycol coolant. This mass of
chilled coolant allows the refrigerant compressor to stop for short
periods while the coolant continues to chill the compressed air. The
larger the thermal mass, the fewer compressor restarts and
consequently the longer it’s service life. The larger thermal mass also
allows a smaller coolant temperature swing, which provides improved
dew point control.
The tank itself offers a generous capacity, thereby maximizing its
advantage. It is made from carbon steel plate. The tank is designed,
manufactured and tested in compliance with all applicable regulations.
The outer walls are insulated in expanded polyurethane for improved insulation and efficiency. An
air bleed valve at the top of the tank and a drain valve at the bottom are fitted as standard.
An expansion vessel and safety valve are fitted as standard, ensuring safety of operation.
The tank does not form part of the dryer’s structural framework and is therefore easily removable
(in the unlikely event it needs to be substituted), offering an important maintenance advantage.
3.2.4 Coolant
Pump
The Coolant Pump is installed on the inlet side of the Coolant
Tank. By continuously circulating the coolant, the heat is more
easily dispersed than with a static Thermal Mass design, and
as a consequence, much tighter dew point control can be
achieved.
The pump is centrifugal, with a cast iron body and plastic
impeller. The impeller consists of a series of radial blades.
The pump is protected by thermal and over current relays. All
models, regardless of design, use a 115V pump.
A polyurethane thermal insulation is applied to the pump.
The pump is connected to the coolant piping with flanges.
The pump operates continuously at all times when the dryer ON/OFF switch is in the ON position.
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