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COOLANT COOLERS
Following are instructions for removal and internal
cleaning of coolant coolers.
Coolant Cooler
■ Remove panels and top cover.
■ Drain the coolant. See Section 4.6.
■ Remove side panels from coolant cooler box.
■ Disconnect piping from coolant cooler inlet and outlet
ports.
■ Plug cooler inlet and outlet ports to prevent possible
contamination.
■ Remove coolant cooler holding screws from sides of
coolant cooler and remove cooler through side of
cooler shroud.
Coolant Cooler Cleaning
■ It is recommended the cooler be taken to a
professional cooler service shop for flushing with an
appropriate environmentally safe cleaning agent.
■ Reassemble in reverse order.
■ Make sure fan guards are replaced.
■ Refill the compressor with coolant. If contamination is
suspected, replace with new coolant.
■ Replace fill plug.
■ Run compressor for ten minutes. Check for possible
leaks. Check coolant level.
■ Replace enclosure panels.
4.9 COOLER CORES: CLEANING
Ensure the compressor is isolated from the
compressed air system by closing the isolation valve
and venting pressure from the drip leg.
Ensure the main power disconnect switch is locked
open and tagged. (See Figure 4.9-1).
TOOLS REQUIRED
■ Screwdriver
■ Wrench set
■ Air hose equipped with approved O.S.H.A. nozzle.
On units sold outside the U.S.A. consult
local codes.
PROCEDURE
Visually check the outside of the cooler cores to be
certain that a complete outside cleaning of the cooler is
required. Frequently, dirt, dust or other foreign material,
may only need to be removed with an air hose to remedy
the problem.
When the cooler is covered with a combination of
oil, grease or other heavy substances that may
affect the unit’s cooling, then it is recommended
that the cooler cores be thoroughly cleaned on the
outside.
If it is determined that the compressor operating
temperature is higher than normal due to the internal
passages of the cooler cores being restricted with
deposits or foreign material, then the cooler should be
removed for internal cleaning.
Strong cleaners can harm
aluminum cooler parts. Follow cleaner
manufacturer’s instructions for use.
Wear appropriate safety equipment.
CAUTION
FIGURE 4.9-1 MAIN DISCONNECT
LOCKED AND TAGGED
HASP
LEVER
TAG
KEY LOCK