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9. Fill unit with new coolant as follows:
a. Fill tank to the bottom of the threads in 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 filter element, and coolant carry-over downstream.
4.11 COOLANT CHANGE
Before beginning any work on the compressor,
open, lock and tag the main electrical disconnect
and close the isolation valve on the compressor
discharge.Wait 2 minutes after stopping to allow
internal pressure to dissipate.Vent residual pres-
sure 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 pip-
ing 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.
Special Tools
Suitable clean drain pan or container to hold approxi-
mately 1.5 gal. (5.75 L) of coolant drained from unit.
A quantity of proper coolant sufficient to refill the
coolant level in the compressor.
One genuine IR replacement coolant filter of the
proper type for the unit.
Procedure
The coolant should be drained soon after the com-
pressor has been shut down. When the coolant is
warm, the drainage will be more complete and any
particles in suspension in the coolant will be carried
out with the coolant.
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