Filter
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Operation
4. Manually open the oil isolating valve at the oil
separator outlet connection.
5. Open the isolating valve(s) before and after the
oil filter housings.
6. Manually open the stop valve on the oil bleed
return line from the element section and open
the expansion valve 1/2 of a turn.
FIGURE 5.
OIL SEPARATOR BLEED LINE
NOTE:
The purpose of the oil bleed return assembly is to
collect any oil that passes through the oil separat-
ing element and returns that oil to the compres-
sor. The hand expansion valve should be adjusted
to prevent an oil level from forming in the sight
glass when the compressor is at 100% capacity.
Generally 1/2 to 1 turn open is satisfactory.
7. Open 1/4” high pressure gas line
valve piped to oil injection line just
enough to quiet compressor at 100%
capacity.
E. Compressor Pre Start-Up Check List
Before proceeding with actual starting of the
compressor, the items listed on the “Pre Start-Up
Check List” must be verified. Time and money will
be saved before the Vilter start-up technician ar-
rives. (See next page.)
3. Suction Pressure
Low suction pressure cutout stops the compres-
sor unit when the suction pressure drops below
the setpoint.
4. Oil Filter Differential
High oil filter differential cutout stops the com-
pressor unit when the difference between the
outlet and inlet of the filter exceeds the setpoint.
5. Oil Temperature
The oil temperature cutout stops the compres-
sor unit when the oil temperature is too high
or too low.
6. Discharge Temperature
The high discharge temperature cutout stops
the compressor unit when the discharge tem-
perature exceeds the setpoint.
INITIAL START-UP
A. Setting of Controls
(Refer to the appropriate microprocessor manual
for a list of initial settings.)
B. Valve Settings
1. The suction line uses separate stop and check
valves. Ensure the suction stop valve is open
prior to starting.
2. The ¼” suction equalization valve should be
closed during operation. The valve enables the
unit to slowly equalize to low side pressure dur-
ing off periods. This valve must be adjusted to
minimize oil loss when compressor stops.
3. The discharge line uses separate stop and check
valves. Ensure the discharge valve is open prior
to starting.