B-1 l A ppendix
Cleaning the Precooler Coils
If you have the optional precooler, you need to clean the coils to keep them work-
ing efficiently. Cleaning frequency depends on the type and amount of material
you process.
1 Stop the dryer and lockout the main power.
2 Turn off the water flow to the water supply line. Disconnect
supply and return lines.
NOTE: If an optional flow control was added with the precooler, remove the compres-
sion fitting from the precooler inlet. Loosen the fitting on the flow control, then swing
the copper water supply tube out and away from the precooler inlet.
3 Remove the two (2) nuts securing the precooler in the housing.
✒
TIP: If the precooler (without a flow control) was installed using the recommended 24
inch {61 cm} of flexible hoses, there is no need to disconnect the hoses from the precooler
inlet and outlet.
4 Remove the precooler assembly from the precooler housing.
5 Clean the assembly using a mild soap and water. Let the assembly dry thor-
oughly before installation.
6 Inspect the condition of the gasket. If it is damaged, replace the gasket.
7 Reassemble by repeating the steps in reverse order.
8 Connect the water supply line to the inlet. If a manual shut off valve is
used, it should be mounted on the inlet line as well.
9 Connect the outlet of the precooler to the inlet of the flow control valve
using the pre-shaped copper tubing and compression fittings provided.
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