ae-1111 - mounting parts for copeland compressors · pdf file2015 emerson climate technologies...

1© 2015 Emerson Climate Technologies

AE4-1111 R25

Mounting Parts for Copeland™ Compressors

AE4-1111 R25 May 2015

Several different mounting assemblies are used with Copelametic™, Copeland™ welded, and Copeland Scroll™ motor-compressors. The following information should be used as a guide in the application and installation of these mounting assemblies.

Vendor sources for mounting components are provided in Table 5 for those system manufacturers who want to obtain the parts directly from the manufacturer.

Copelametic Compressors When mounting the “H” and “K” model Copelametic motor compressors, the spring type mounting assembly shown in Figure 1 should be used.

When units using this mounting assembly are shipped from the factory, the motor-compressors are rigidly secured to the base by the mounting components. Before these units are put into operation the top mounting nut must be loosened to allow the compressor to float on the mounting springs. (Allow approximately 1/16" between the upper nut and the neoprene spacer).

The mounting assemblies for “H” and “K” com pressors

require a special locking device to prevent rotation of the mounting bolt and for this purpose an extra hole must be drilled in the base for each mounting assembly as shown in Figure 2.

The mounting assemblies shown in Figure 3 should be used with all Copelametic motor-compressors larger than the “K” models. This assembly is somewhat similar to the assembly in Figure 1, but the neoprene spacers used with this assembly are not to be in place during transit. Before units using this assembly are put into operation, the top mounting nuts must be removed; one neoprene spacer placed on each mounting bolt, and the mounting nut replaced leaving 1/16" space between the upper mounting nut and neoprene spacer as shown in Figure 3. (Four neoprene spacers will be found attached to the compressor body).

The above method of mounting prevents the transmission of noise while also preventing excessive movement during starting and/or stopping of the motor-compressor.

When installing motor-compressors which use the mounting assembly shown in Figure 3, the shipping spacer is to be in place during shipment to insure maximum support for the compressor body during transit. Before the unit is put in operation, the shipping spacer should be removed and discarded.

Resilient type mounts such as shown in Figure 4 are used on some two-stage compressors to reduce the magnitude and change the frequency of vibration due to pulsation. The same type mount is used on

Figure 1 Mount is shown in properly adjusted position.

(See Table 1 for Usage) Figure 2


AE4-1111 R25

tandem compressors in order to compensate for minor alignment variations in the mounting rails.

For transportation type refrigeration installations, in which the unit is subject to severe vibration, the flexible mounts should be omitted and the compressor mounted rigidly to the unit base. This must be done to prevent line breakage. These solid mounts must be perfectly level to prevent distortion of the compressor body casting. (See Figure 5).

The individual components and mounting parts kits for all Copelametic motor-compressors are shown in Table 1.

Note: When replacing a compressor equipped with a deep sump bottom plate and rear mounting foot, with a normal sump compressor, you must re-use the deep sump bottom plate, rear mount, and rear mounting

Figure 3

Figure 4

527-0120-00 Mounting Kit No. Figure 5

spacer and bolts, or purchase these components new. Replace bottom plate gasket. The compressor line set hook up will be affected if the incorrect components are used in a deep sump application. You also must remove the oil strainer plug and screen from the new compressor. In its place you must install a new fitting plug, bolt, O-ring, gasket, and spring into the hole in the replacement compressor. The compressor will not circulate oil properly if this is not done.

Note: The old deep sump compressor should be equipped with a plug, bolt, gasket, O-ring, and spring. These can be re-used if undamaged.


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AE4-1111 R25

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AE4-1111 R25

Figure 6

Figure 7

Figure 8

Copeland Welded CompressorsAll current production Copeland welded compressors are internally spring mounted (with the exception of ZR Compliant Scroll) to reduce vibration.

Resilient type external mounts have been developed specifically for each compressor model after extensive testing. The exact characteristics of each mount vary depending on the weight, configuration, and vibration characteristics of the compressor on which it is used. Typical mounting assemblies are shown in Figures 6, 7, 8. Mounting part numbers for each model are given in Table 2. Dimensions for the locations of the holes required for each compressor mounting option are shown in Figure 12.

On smaller single cylinder compressors, a softer rubber mount can be used (a lower durometer rating) since the weight involved is not great, but provisions must be made for adequate dampening of lateral movement due to the inherent characteristics of a single cylinder compressor.

Larger compressors normally take a somewhat stiffer mount (higher durometer rating) because of their weight, but have more natural balance due to multiple cylinder operation.

In general, rubber in shear provides better dampening of vibration than rubber in compression, and the rubber grommet is designed to provide as much shear

stress as possible.

Occasionally, system manufacturers desire to use one mounting for standardization purposes, even though they may be using different compressors in production. It is possible that a given mount may not be compatible with different compressor characteristics, and may not adequately attenuate vibration and noise transmission. If a customer wishes to use a different mount than the standard Copeland mounting specified, the replacement mounting must be carefully tested


AE4-1111 R25

Figure 9 Figure 10

by the customer to make certain that its use will not result in excessive vibration, noise, and movement. It is most important that the mount not be placed in lateral compression by the compressor mounting foot. Noise and vibration isolation may be affected by the rigidity of the unit frame, the compressor mounting foot configuration, or the refrigerant piping. In some cases, a change in grommet durometer may be helpful in obtaining more effective isolation, but generally this can only be determined by comparative testing during unit development.

The metal sleeve inside the rubber grommet is intended as a guide to hold the grommet in place. It is not designed as a load bearing member, and excessive torquing of the mounting nut can collapse the sleeve.

It is critically important that the rubber grommet not be compressed by the washer, and a clearance space of approximately 1/16" between the bottom of the washer and the top of the grommet is recommended (see Figure 9). Although this space is determined by the length of the sleeve, it is possible that the proper sleeve length may be determined by the type of mounting stud. Weld studs, for example, may have a projection around the base of the stud affecting the seating of the sleeve. It is essential that the sleeve be firmly supported on an even base, and a rounded projection around the base of the stud causing the sleeve to tilt at an angle can have detrimental effects on noise and vibration transmission.

Some users have developed mounting studs with shoulders to support the washer, and with a grommet having a straight through hole the size of the mounting stud, the inner sleeve can be eliminated.

When installing these mounting assemblies the holes for the mounting bolts must be spaced correctly and located squarely. For this reason it is suggested a template with holes very nearly the size of the mounting bolts be used giving the correct location of the bolts when the mounting assemblies are installed.

Washers used with resilient mounts for Copeland welded compressors must be properly sized to prevent the washer from slipping over the metal sleeve compressing the grommet. To avoid this problem, a lock-nut with integral washer is recommended for fastening the mounting assembly on weld studs. (See Figure 10).

Even though the compressor is properly mounted in the unit to minimize noise and vibration, it is still possible that pulsation and noise can be transmitted from the unit to the building where it is installed. This is particularly a problem on split system condensing units mounted on the roofs of multi-story apartment houses where the roof construction may be less rigid than industrial construction. Single units in operation seldom create a problem, but a combination of several units in operation at once in fairly close physical proximity can create a resonant condition which may be annoying to the residents of the top floor apartments. Field experience has indicated the best cure for this is a soft resilient mounting between the bottom of the unit and the apartment roof to reduce interaction between the units. Springs or fairly soft vibration dampening material have been used successfully. Hard, rigid type material is usually not satisfactory.


AE4-1111 R25

Figure 11

Glacier Mounting Grommet

KIT* 527-0157-00

Copeland Scroll Compressor Mounting Compressors can be mounted either with rubber grommets or solid mounts. Consideration must however, be given to sound attenuation and tubing reliability. Unlike a hermetic reciprocating compressor, the scroll motor is pressed into the shell and not internally sprung. Some tubing geometry or “shock loop” may be required to reduce start-up vibration transferred from the compressor to external tubing.

Rubber Mounts - Specially designed rubber grommets are available for Glacier Scroll applications. These grommets are formulated from a high durometer material specifically designed for refrigeration applications. The high durometer limits the compressors motion thereby minimizing potential problems of excessive tubing stress. Sufficient isolation is provided to prevent vibration from being transmitted to the mounting structure. This mounting arrangement is recommended for multiple compressor rack installations. See Figure 11 for a detail of this mounting system.

Note: The use of standard A/C grommets is not recommended for most Glacier installations unless extensive vibration analysis is performed by the OEM. These “softer” mounts allow for excessive movement that will result in tube breakage unless the entire system is properly designed.

Hard Mounts - Specially designed hard mounts are also available for use with Glacier Scroll compressors. These can be used in applications where excessive external vibration (such as transport applications) is expected. See Figure 12 for illustration.

Tubing Considerations - The mounting technique used must be taken into consideration when designing the tubing connecting the Scroll to the remaining system. The tubing should provide enough “flexibility” to allow normal starting and stopping of the compressor without exerting excessive stress on the tube joints. In addition, it is desirable to design tubing with a natural frequency away from the normal running frequency of the compressor. Failure to do this can result in tube resonance and unacceptable tubing life.

Caution: These examples are intended only as guidelines to depict the need for flexibility in tube designs. In order to properly determine if a design is appropriate for a given application, samples must be tested and evaluated for stress under various conditions of use including voltage and load fluctuations, and shipping vibration. Since this magnitude of testing is not practical for many applications, the guidelines above may be helpful; however, the ultimate responsibility for the reliability of a given tube design is the OEM.


AE4-1111 R25

Glacier "Hard" Mount

KIT* 527-0158-00

Figure 12

Figure 13

External Spring for Copeland Welded Compressors On applications where noise and vibration suppression is critical, external spring mounts have proven to be very effective. (See Figure 11). To be effective, the compressor must float on the spring assembly, and there must be a minimum of 1/16" clearance between the top of the neoprene spacer and the top mounting nut.

To avoid damage in shipment, the compressor must be securely fastened in the unit during transit.


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AE4-1111 R25

Compressor Model

Assembly Number Grommet Sleeve Number

RequiredJ, R (4 Foot) 527-0039-04 027-0073-00 027-0072-02 4J, R (3 Foot) 527-0039-05 027-0073-00 027-0072-02 3S, CRZ-CRK

CRL3, CRM3, ZR16-ZR24CR*6, CS*6, CS*3

527-0044-08 027-0167-00 028-0188-02 4

CRL1, CRM1, CRP,CRN, ZF(09-18)K

ZS(21-45)K, ZR(18-72)K527-0116-00 027-0186-00 028-0188-02 4

B, QR 527-0156-00 027-0137-00027-0283-00 030-0142-02

ZR90K - ZR16MZF (22K-44K)ZS (55 - 11M)

527-0159-00 027-0137-00027-0268-00 030-0142-00 4

ZZ TandemStiff Rack Mount

ZF(09-18)KZS(21-45)K

527-0157-00 027-0186-02 028-0188-02 4

Hard Rock MountZF(22K-44K)ZS (55K-11M)

527-0158-00

Rubber Pad027-0115-00027-0280-00Steel Spacer

N/A 4

Table 3Standard Mounting Assemblies

Table 4Spring Mounting Assemblies


AE4-1111 R25

Table 5Vendor Sources for Mounting Parts


AE4-1111 R25

8 21/32

Mounting OptionsFigure 14


AE4-1111 R25

Mounting OptionsFigure 14 (cont.)

J Mounting

ae-1111 - mounting parts for copeland compressors · pdf file2015 emerson climate technologies...

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