Emerson ZB Copeland Scroll Service Manual download pdf (Page 10)

ZB Series

Application guide

Filter for the suction piping

To avoid compressor faults, all impurities (fouling products, welding scale, borax and metal fragments etc.) must be removed from the system

before start of operation. The impurities can go into the compressor suction area even through the micro filter because of the extremely fine

size of impurities. When the assembly is carried out at-site and the necessary cleanliness cannot be ensured, it is suggested that a high-

capacity filter is used for the suction (there is only a very small pressure drop). A pressure gauge should be placed before the filter to detect the

pressure drop arising from the filter.

Oil separator

When installing the oil separator, it must be charged with the lubricating oil until the valve begins to open. The oil quantity in the oil separator

should be maintained at all times. If not, the oil in the compressor will be drawn off by the oil separator; consequently the oil quantity will

decrease gradually.

Refrigerant and oil

The refrigerants R22, R404A, R507 and R134a etc. can be used in ZB Series scroll compressors. If any of the environmentally-friendly

refrigerants, namely, R134a, R404A, R507 etc. are used, an ester lubricating oil must be used (POE oil). The residual water content in a system

charged with POE oil must be below 50ppm. This is because of the highly hygroscopic nature of ester oil. Such a measurement can be carried

out only after the system has run for 48 hours. A good filter-drier of large capacity may be installed according to the system and refrigerants.

At the time of commissioning, an appropriate capacity of vacuum-pump must be selected. Parts used with the system must be selected

keeping in mind the characteristics of the refrigerant (consult with the part manufacturer about details). These include:

Expansion valves

Filter-Dryer

Valves, fittings and control devices.

These would change depending upon the change of the mass flow rates of refrigerants.

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Emerson ZB Copeland Scroll Service Manual Page 10