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E-1 l Appendix
Installing a Precooler (Optional)
You can add a precooler to the D Carousel Dryer by ordering the optional precool-
er assembly. Installation is easy.
The optional precooler requires a source of city, tower, or chiller water and a dis-
charge or return line. You can use water at temperatures up to 85°F ( 30°C). But
the water flow should be at least 1 gal/min (3.8 liters/min) for models D15, D25,
D50; or 2 gal/min (7.6 liters/min) for models D75 and D100.
1 Stop the dryer and lockout the main power.
2 Remove the left dryer side panel.
3 Mount the precooler to the back of the dryer using existing holes and the
5/16-8 bolts provided. Note that for D 15, 25, and 50 models, the precooler is
mounted to the dryer with the water fittings and precooler air outlet at the top.
On D 75 and 100 models, the precooler is mounted with the water fittings and
precooler air outlet at the bottom.
4 Connect the process air outlet hose to the precooler air inlet tube and tight-
en the clamp provided.
5 Connect the hopper air inlet air hose to the precooler air outlet tube and
tighten the clamp provided.
Note: If an optional flow control was ordered with the precooler,
see Appendix E
"Optional Flow Control"
for information on connecting the water supply.
Note: If the optional Conair flow control valve was not ordered with the dryer, it is
strongly recommended that a customer-supplied manual flow control valve be installed
on the water inlet line.
6 Connect the water supply line to the precooler inlet. If a manual shut off
valve is used, it should be mounted on the inlet line.
(continued)
✐
✐
✒
TIP: Make the water supply and dis-
charge / return connections with
flexible hoses at least 24 in. (61 cm)
long. This allows you to easily
remove the precooler assembly for
cleaning.
✒
TIP: If an optional flow control is also
being installed with the precooler,
the manual shut off valve should be
installed on the inlet line for the flow
control.