Vilter VSM 71-701, Operation And Service Manual

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The procedure described is a general recommendation for extended storage (over one month of no operation) of
Vilter Manufacturing packages and compressors. While this procedure is intended to cover most of the commonly
encountered situations, it is the responsibility of the installation firm and end user to address any unusual condi-
tions. We suggest using the accompanying Long Term Storage Log sheet for recording purposes to validate the
appropriate procedures.
Prior to start-up, Vilter recommends that a complete system pressure check be performed. Upon verification of the
system integrity, a comprehensive evacuation procedure should be completed to ensure a dry system before refriger-
ant is introduced. The oil circuit of any compressor is to be primed at initial start-up through the oil gauge connec-
tion on reciprocating compressors and the pre-lube oil pump on screw compressors.
Warranty of the system remains in effect as described in Section 5, Product Warranty and Procedures.
* If the unit is designed for indoor duty, it must be stored in a heated building.
If the unit is designed for outdoor duty, and is to be stored outdoors, a canvas tarp is recommended for protec-
tion until installation is imminent. Adequate drainage should be provided, by placing wood blocks under the
base skid, so that water does not collect inside the base perimeter or low spots in the tarp.
* All compressor stop valves are to be closed to isolate the compressor from the remainder of the system. All
other valves, except those venting to atmosphere, are to be open. It is essential that the nitrogen holding charge
integrity be maintained.
* Cover all bare metal surfaces (coupling, flange faces, etc.) with rust inhibitor.
* Desiccant is to be installed in the control panel. If the panel is equipped with a space heater, it is to be
energized. If the panel does not have a space heater, use a thermostatically controlled 50-watt light bulb. Use
an approved electrical spray-on corrosion inhibitor for panel components (relays, switches, etc.)
* All pneumatic controllers and valves (Fisher, Taylor, etc.) are to be covered with plastic bags and sealed with
desiccant bags inside.
* System and compressor pressures (unit is shipped with dry nitrogen holding charge approximately 5 psi above
atmospheric pressure) are to be monitored, on a regular basis, for leakage. It will be necessary to add a gauge
to monitor the system holding charge pressure. If a drop in pressure occurs, the source of leakage must be found
and corrected. The system must be evacuated and recharged with dry nitrogen to maintain the package integ-
rity.
* Motors – ( NOTE : The following are general recommendations. Consult the manufacturer of your motor for
specific recommendations.)
Long Term Storage
Requirements