Emerson ZB Copeland Scroll Service Manual download pdf (Page 12)

ZB Series

Application guide

Installation and piping arrangement

Installation of the compressor should be done according to the

service conditions. The selected installation and piping design

should dampen the transmission of noise and vibration as far as

possible. Please see also the following table for tightening torques:

Reference table for tightening torque

Torque (N.m)

Rotalock screw valve 3/4''-16UN 40-50

Rotalock screw valve 1 1/4''-12UN 100-110

Rotalock screw valve 1 3/4''-12UN 170-180

Rotalock screw valve 2 1/4''-12UN 190-200

Flange with M16 stud 102-113

Oil level sight glass 25-25.5

5/16'', M9 installation stud Maximum 27

Soft foot 12-14

Connecting screw in terminal box 2.5-2.6

Mounting

The single-compressor-condenser unit makes use of soft rubber

grommets for mounting. When the compressors are used for

tandem operation, they are mounted by means of steel spacers or

two steel rails. This rigid mounting keeps the interconnecting tubing

stresses to a minimum. The tandem assembly should be mounted on

rubber isolating grommets to the unit base pan. Both compressors

must be at the same level to prevent oil from migrating to the lowest

compressor through the oil equalization line.

Pipeline

During installation, great care should be taken to keep the

piping lines of the refrigerating equipment extremely clean. In

principle, the refrigerating equipment should always have clean

and dry pipelines, and there should not be any scale, rust and

phosphate layer on it. Dry nitrogen must be charged in the

pipeline during welding. To prevent the welding joints in the

pipeline from producing foul, the welding temperature must be

carefully controlled. The welding operation should not be

carried out on pipeline that contains refrigerant (even if the

refrigerant is not under pressure), because the heating of

refrigerant, oil and air will form a toxic gas. The pipeline design

must ensure that, even at part load, the lubricating oil returns

to the compressor despite low gas flow velocity in the suction

and discharge pipes.

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Emerson ZB Copeland Scroll Service Manual Page 12