35
9. Fill unit with new coolant as follows:
a. Fill tank to just below the threads of the fill
port.
b. Restart machine and verify that coolant level
is in the green operating zone as viewed
through the sight tube (See Figure 5.11-2).
10. Replace fill plug.
11. Start unit and check for leaks.
Do not add coolant through the intake of the compres-
sor, as this can result in overfilling, saturation of the
separator filter element, and coolant carry-over down-
stream.
4.12 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 5.3-1). 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.
FIGURE 5.12-1 OIL DRAIN VALVE
OIL DRAIN VALVE
FIGURE 5.11-2 COOLANT SIGHT TUBE
Special Tools
Suitable clean drain pan or container to hold approxi-
mately 3.2gal. (12L) 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 prop-
er type for the unit.
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.
1. Place a clean pan under the oil drain valve.
2. Remove the cap from the oil drain valve
(See Figure 5.12-1).
3. Thread the oil drain fitting (supplied with compres-
sor), with hose attached, onto the oil drain valve. The
valve will open as the fitting is threaded completely,
allowing the oil to drain.
COOLANT SIGHT TUBE
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