25
FIGURE 4.11-1 COOLANT DRAIN VALVE
COOLANT DRAIN VALVE
SIGHT GLASS
11. Remove coolant fill plug (See Figure 4.10-1).
12. Fill unit with new coolant as follows:
a. Fill tank to the bottom of the threads of the
coolant fill port.
b. Replace fill plug.
c. Run compressor 15-20 seconds.
d. Stop compressor and relieve pressure by
slowly unscrewing the coolant fill plug one
turn. Do not remove fill plug until all pressure
has vented.
e. Add more coolant up to the bottom of the
threads of the coolant fill port.
f. Replace fill plug.
g. Start the compressor and verify coolant level
is in the bottom half of the sight glass
(See Figure 4.11-1) when the compressor is
running unloaded.Check for leaks.
Do not add coolant through the intake of the compres-
sor, as this can result in overfilling, saturation of the sep-
arator element, and coolant carry-over downstream.
4.12 COOLANT HOSE
The flexible hose that carries coolant to the airend may
become brittle with age and will require replacement.
Have your local Ingersoll-Rand Distributor or Air Center
check it every year, and replace as needed or every 2
years.
Before beginning any work on the compressor,
open, lock and tag the main electrical disconnect
and close the isolation valve on the compressor dis-
charge.Wait 2 minutes after stopping to allow inter-
nal pressure to dissipate.Vent residual pressure
from the unit by slowly unscrewing the coolant fill
plug one turn. Unscrewing the fill plug opens a vent
hole, drilled in the plug, allowing the pressure to
release to atmosphere (See Figure 4.3-1). A slight
mist or oil droplets may be visible during venting.
Do not remove fill plug until all pressure has vented
from the unit. Also vent piping by slightly opening
the drip leg valve.When opening the drain valve or
removing the coolant fill plug, stand clear of the
valve discharge, wear work gloves and appropriate
eye protection.
Removal
Drain coolant into a clean container. Cover the container
to prevent contamination. If the coolant is contaminated,
a new charge of coolant must be used.
Remove the hose.
3.Thread the coolant drain fitting (supplied with com-
pressor), with hose attached, onto the coolant drain
valve.The valve will open as the fitting is inserted
allowing the coolant to drain.
4. Using a filter wrench, remove the coolant filter.
Remember that the coolant filter may be hot!
5. Discard the old filter.
6. Wipe the sealing surface of the filter head with a
clean lint-free rag to prevent entry of dirt into the sys-
tem.
7. Remove the replacement filter from its protective
package.
8. Apply a small amount of clean coolant on the rub-
ber seal of the filter.
9. Screw element on until the seal makes contact with
the seat on the filter header.Tighten approximately
one half to three quarters turn additional.
10. Remove drain fitting and replace drain valve cap.
1. Place a clean pan under the coolant drain valve.
2. Remove the cap from the coolant drain valve
(See Figure 4.11-1).
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