Appendix A • Unloaders
A – 1
MicroVission Controller • Operation and Service Manual • Emerson • 35391MV 1.3
Unloading Schemes
The following Table lists the different types of Unloading Schemes provided for balancing Vilter Reciprocating
Compressor’s capacity to varying load requirements.
Type Unloaders
TYPE1 2, 4 or 6 cylinders with 50% unloading
TYPE2 4 cylinders with 25%, 50%, 75% unloading. Single cylinder on Unloader Output #1
TYPE3 6 or 12 cylinders with 33%, 66% unloading
TYPE4 8 or 16 cylinders with 25%, 50% unloading
TYPE5 8 or 16 cylinders with 25%, 50%, 75% unloading
TYPE6 4 or 8 cylinders with 50%, 100% unloading
TYPE7 6 or 12 cylinders with 33%, 66%, 100% unloading
TYPE8 6 or 12 cylinders with 17%, 33%, 50%, 66% unloading. Single cylinder on Unloader Output #1
TYPE9 6 or 12 cylinders with 17%, 33%, 50%, 66%, 83% unloading. Single cylinder on Unloader Output
#1
TYPE10 7 cylinders with 29%, 57% unloading
TYPE11 Compressor with NO unloading
TYPE12 3 cylinders with 33% unloading
TYPE13 8 or 16 cylinders with 25%, 50%, 75%, 100% unloading
TYPE14 6 cylinders with 33%, 50%, 66% unloading. Single cylinder on Unloader Output #1
TYPE15 8 cylinders with 13%, 25%, 38%, 50%, 63%, 75% unloading. Single cylinder on Unloader Output
#1 and Output #2
TYPE16 8 cylinders with 13%, 38%, 63% unloading. Single cylinder on Unloader Output #1
TYPE17 6 cylinders with 33%, 50%, 66% unloading. Single cylinder on Unloader Output #1
TYPE18 5 cylinders with 40%, 60% unloading. Single cylinder on Unloader Output #1
TYPE19 3 cylinders with 33%, 66% unloading. Single cylinder on Unloader Output #1 and Output #2
TYPE20 7 cylinders with 14%, 29%, 43%, 57% unloading. Single cylinder on Unloader Output #1
Table A-0. Unloading Schemes
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