Emerson VSS, VSR, VSM service manual Installation

Installation

I.DELIVERY INSPECTION

Vilter screw compressor components are thor- oughly inspected at the factory, assuring the shipment of a mechanically perfect piece of equip- ment. Damage can occur in shipment, however. For this reason, the units should be thoroughly inspected upon arrival. Any damage noted should be reported immediately to the transportation company. This way, an authorized agent can ex- amine the unit, determine the extent of damage and take necessary steps to rectify the claim with no serious or costly delays. At the same time, the local Vilter representative or the home office should be notified of any claim made.

TABLE 1.	UNIT WEIGHTS (LBS)*
MODEL	STANDARD	ECON-O-
		MIZER
VSM 71	2,750	2,750
VSM 91	2,750	2,750
VSM 101	2,750	2,750
VSM 151	2,750	2,750
VSM 181	2,750	2,750
VSM 201	2,750	2,750
VSM 301	2,850	2,850
VSM 361	2,850	2,850
VSM 401	2,850	2,850
VSM 501	4,000	4,000
VSM 601	4,500	4,500
VSM 701	5,000	5,000
VSS 451	4,000	4,000
VSS 601	4,500	4,500
VSS 751	5,300	5,300
VSS 901	5,300	5,300
VSS 1051	6,600	6,600
VSS 1201	6,700	6,700
VSS 1301	6,750	6,750
VSS 1501	10,010	10,010
VSS 1801	10,010	10,010
VSS 1551	11,000	11,000
VSS 1851	11,000	11,000
VSS 2101	11,000	11,000

* Does not include motor.

II.FOUNDATIONS

Vilter single screw compressor units are basi- cally vibration free machines, therefore, no elaborate foundations are necessary. The floor or foundation upon which the unit will be placed should be designed to support the entire op- erating weight of the unit. See Table 1 for unit weights. See Foundation, page 12, for additional foundation instructions.

III.LOCATING UNIT - DRIVE COUPLING ALIGNMENT

The single screw compressor units are shipped with all major components mounted on struc- tural steel. Place the entire unit on the floor on a concrete pad and securely bolt in place. Review local codes and ASHRAE Safety Code for Mechanical Refrigeration. Bolt holes are located in the unit’s mounting feet. When locating the unit, provide adequate space for service work. When the compressor unit is in place on the con- crete pad, check both lengthwise and crosswise to assure it is level. Use shims and wedges as needed under the mounting feet to adjust the level of the unit.

On single screw units, the motor and compres- sor have been roughly aligned at the factory. The coupling center section was shipped loose to allow a check of proper electrical phasing, direction of rotation of the motor and final coupling alignment. The dial indicator align- ment method is recommended. Final alignment should be within 0.004 inches total indicator reading in all direction for the VSS models and 0.010 inches for the VSM models.

III.SYSTEM PIPING

Refer to the ANSI/ASME B31.5 Code for Refrig- eration Piping. All compressor oil supply and oil return piping has been completed at the factory. The necessary connections to be made to the screw compressor unit will vary depending on the type of oil cooling method purchased. Main line refrigerant suction and discharge connec- tions are always necessary.

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