Installation and Maintenance Manual

Service and Maintenance
190 RLC-SVX09H-EN
6. If the level is below 4”, there is not enough oil in the
sump.This can occur from not enough oil in the
system or more likely, oil migration to the evaporator.
Oil migration can occur from a low refrigerant charge,
gas pump malfunction, etc.
Note: If the oil is logged in the evaporator confirm the
operation of the gas pump. If the gas pump is not
functioning properly all oil will be logged in the
evaporator.
7. After the level is determined, close the service valves
and remove the hose/sightglass assembly.
Removing Compressor Oil
The oil in the compressor oil sump is under a constant
positive pressure at ambient temperature.To remove oil,
open the service valve located on the bottom of the oil
sump and drain the oil into a suitable container using the
procedure outlined below:
Oil should not be removed until the refrigerant is isolated
or removed.
8. Connect a line to the oil sump drain valve.
9. Open the valve and allow the desired amount of oil to
flow into the container and close the charging valve.
10. Measure the exact amount of oil removed from the
unit.
Oil Charging Procedure
It is critical to fill the oil lines feeding the compressor when
charging a system with oil.The diagnostic “Loss of oil at
the compressor stopped” will be generated if the oil lines
are not full on start-up.
To properly charge the system with oil, follow the steps
below:
1. Locate the 1/4” schrader valve on the end of the
compressor.
2. Loosely connect oil pump to schrader valve called out
in step 1.
3. Operate oil charging pump until oil appears at the
charging valve connection; then tighten the
connection.
Note: To keep air from entering the oil, the charging valve
connection must be air- tight.
4. Open the service valve and pump in the required
amount of oil.
Note: Adding oil at the oil charging port ensures that the
oil filter cavity and the oil lines back to the oil
separator are filled with oil. An internal oil valve
prevents oil from entering the compressor rotors.
Replacing the Oil Filter
The filter element should be changed if the oil flow is
sufficiently obstructed.Two things can happen: first, the
chiller may shut down on a “Low Oil Flow” diagnostic, or
secondly, the compressor may shut down on a “Loss of Oil
at Compressor (Running) diagnostic. If either of these
diagnostics occurs, it is possible the oil filter needs
replacement.The oil filter is not usually the cause of a Loss
of oil at Compressor diagnostic.
Specifically, the filter must be changed if the pressure drop
between the two service valves in the lubrication circuit
exceeds the maximum level as given in Figure 89, p. 191.
This chart shows the relationship between the pressure
drop measured in the lubrication circuit as compared with
operating pressure differential of the chiller (as measured
by pressures in the condenser and evaporator).
Normal pressure drops between the service valves of the
lubrication circuit are shown by the lower curve.The upper
curve represents the maximum allowable pressure drop
and indicates when the oil filter must be changed. Pressure
drops that lie between the lower and upper curves are
considered acceptable.
For a chiller equipped with an oil cooler, add 5 psid to the
values shown in Figure 89. For example, if the system
pressure differential was 80 psid, then the clean filter
pressure drop would be approximately 15 psid (up from 10
psid). For a chiller with an oil cooler and operating with a
dirty oil filter, the maximum allowable pressure drop
would be 28 psid (up from 23 psid).
Under normal operating conditions the element should be
replaced after the first year of operation and then as
needed thereafter.
NOTICE:
Equipment Damage!
Due to the hygroscopic properties of the POE oil, all oil
must be stored in metal containers. The oil will absorb
water if stored in a plastic container.
Figure 88. Oil charging port
Oil charging port
(1/4” flare with
schrader valve)