Product Description

The Frascold Z Series is a range of six-cylinder semi-hermetic reciprocating compressors designed for commercial and industrial refrigeration applications.

The available models cover nominal motor ratings from 25 HP to 50 HP and volumetric displacements from 106.2 to 184.7 m³/h at 50 Hz. Multiple motor sizes are available for selected displacement versions, allowing the compressor to be matched more accurately to low-, medium- or high-temperature operating conditions.

The Z Series uses positive-displacement oil-pump lubrication and is suitable for capacity regulation, inverter operation and Frascold RSH capacity-control solutions. Final compressor selection must always be verified according to the refrigerant, evaporating temperature, condensing temperature, voltage and required cooling capacity.

Key Features

• Six-cylinder semi-hermetic reciprocating design

• Displacement range: 106.2–184.7 m³/h at 50 Hz

• Nominal motor range: 18.6–37.3 kW

• Positive-displacement oil-pump lubrication

• Frascold POE68 lubricant

• Maximum frequency: 70 Hz

• Minimum frequency: 30 Hz

• Part-winding-start motor configuration for standard 400 V executions

• Optional stepped capacity regulation

• Capacity-control range up to 100–83–67–50%

• Compatible with Frascold RSH capacity-control heads

• Suitable for inverter operation within the approved operating envelope

• Compact semi-hermetic construction

• Suction and discharge service valves

• Oil level sight glass

• Connections for crankcase heater, oil-pressure protection and discharge-temperature monitoring

Available Models and Electrical Data

Technical values below refer to typical 400 V, 3-phase, 50 Hz, PWS executions.

Dimensions, Connections and Weight

Dimensions are shown as length × width × height.

General Technical Specifications

Refrigerant Compatibility

The Frascold Standard Series supports traditional refrigerants as well as selected low-GWP refrigerants and blends.

Commonly approved refrigerants for the listed Z Series configurations include:

• R22

• R134a

• R404A

• R407A

• R407C on selected models

• R407F

• R448A

• R449A

• R450A

• R452A

• R507

• R513A

Refrigerant approval and the permitted operating envelope depend on the exact compressor model, motor version, application and lubricant configuration. Always confirm the selection before ordering.

Typical Applications

• Commercial refrigeration systems

• Cold-storage rooms

• Frozen-food storage

• Supermarket refrigeration

• Food-processing refrigeration

• Ice-making equipment

• Beverage cooling

• Industrial refrigeration systems

• Condensing units

• Compressor racks

Capacity-Control Options

Depending on the selected configuration, the Z Series can be supplied or operated with:

• Full-capacity operation

• Frascold CC capacity-control heads

• Frascold RSH capacity-control heads

• Stepped capacity regulation up to 100–83–67–50%

• Variable-frequency operation within the approved envelope

• Unloaded-start heads where required

Capacity-control components are not automatically included unless stated in the quotation.

Standard and Optional Equipment

Typical equipment may include:

• Suction and discharge shut-off valves

• Oil level sight glass

• Electronic motor-protection module

• Discharge-temperature sensor

• Electronic oil differential-pressure protection

• Rubber vibration absorbers

• Nitrogen holding charge

• Crankcase heater connection

Optional equipment may include:

• Crankcase heater

• Capacity-control heads

• RSH capacity-control system

• Unloaded-start head

• Electronic oil-level switch

• Special motor voltage

• Additional monitoring and protection accessories

Selection Notice

Cooling capacity cannot be determined from horsepower or displacement alone.

Before ordering, please provide:

• Required refrigerant

• Evaporating temperature

• Condensing temperature

• Required cooling capacity

• Power supply and frequency

• Application type

• Required capacity-control method

We will verify the model and operating envelope using Frascold selection data.