MIDLINE

High-efficiency, configurable water chillers

MIDLINE units are high-efficiency, air-cooled water chillers. They are developed to cover medium-capacity cooling requirements (commercial and industrial applications). MIDLINE units are characterized by high configurability, i.e., a wide selection of hydraulic-side options. All optional equipment is installed inside the unit housing. MIDLINE water chillers are intended for outdoor installation.

The compressor in each refrigeration circuit is a semi-hermetic reciprocating compressor, controlled by a high-efficiency frequency inverter that enables soft start and continuous speed modulation for cooling capacity control.

MIDLINE units are equipped with a shared dual plate evaporator with advanced characteristics (SWEP True Dual technology), which connects both refrigeration circuits to the hydraulic circuit via one plate evaporator. This design ensures unit compactness, guarantees the highest heat exchange efficiency, and reduces the required refrigerant charge. The air condenser is of microchannel aluminum design. Axial fans equipped with EC motors allow variable speed control, resulting in exceptionally high operating efficiency.

Each MIDLINE unit is factory tested and delivered pre-charged with refrigerant and oil. Conformity assessment is carried out in accordance with the European Pressure Equipment Directive (PED) 2014/68/EU. The unit complies with all safety and environmental requirements.

Number of refrigeration circuits*: 2

*Number of refrigeration circuits equals the number of compressors

Number of air heat exchangers (condensers): 4

Unit dimensions:

• Length (without connections): 3475 – 5175 mm
  (depending on equipment configuration)
• Width: 1600 mm
• Height: 2448 mm

As part of the optional equipment, integrated heat exchangers for natural cooling
(free cooling) do not affect the unit length, as they are integrated
within the condenser V-modules.

Cooling capacity:

❮ ❯

Number of refrigeration circuits*: 2

*Number of refrigeration circuits equals the number of compressors

Number of air heat exchangers (condensers): 4

Unit dimensions:

• Length (without connections): 3875 – 5575 mm
  (depending on equipment configuration)
• Width: 1800 mm
• Height: 2760 mm

As part of the optional equipment, integrated heat exchangers for natural cooling
(free cooling) do not affect the unit length, as they are integrated
within the condenser V-modules.

Cooling capacity:

❮ ❯

Number of refrigeration circuits*: 2

*Number of refrigeration circuits equals the number of compressors

Number of air heat exchangers (condensers): 4

Unit dimensions:

• Length (without connections): 3875 – 5575 mm
  (depending on equipment configuration)
• Width: 2350 mm
• Height: 2783 mm

Cooling capacity:

GENERAL

• Powder-coated galvanized steel housing, corrosion and weather resistant, standard color RAL 7035
• Removable housing panels
• Anti-vibration mounts
• Compressor compartment located in a separate protective enclosure within the housing
• Pipe insulation to prevent condensation
• Safety strategy selection – permanent compressor compartment ventilation or refrigerant leak detector combined with ATEX fan
• Safety valves on each refrigeration circuit (depending on required cooling capacity)

ELECTRICAL

• Main power switch and phase monitoring relay
• Electrical protection for all components
• Microprocessor controller supervises full unit operation
• Electronic expansion valve for precise refrigerant flow control
• Communication protocols: Modbus TCP/IP, Modbus RTU or BACnet IP
• Remote unit access

HYDRAULIC CIRCUIT

• Stainless steel pipes of the hydraulic circuit
• Hydraulic connection via free stainless steel flanges
• Air vent valve
• Safety valve
• Drain valve (for system draining and filling)
• Flow switch
• Thermal insulation of piping

GENERAL

• Custom housing color
• Low-noise version with additional sound insulation
• Waste heat recovery option via a series-connected plate heat exchanger in one of two ways:
  • Plate heat exchanger – condenser
  • Desuperheater (no condensation) – desuperheater

ELECTRICAL

• Advanced Siemens Climatix microprocessor controller option
• Cabinet lamp with socket
• Electrical cabinet heater (250 W)
• Dry contacts for alarms
• Self-regulating heating cables
• ATEX or LED lamp for compressor enclosure
• Electrical energy meter
• Signal tower – light indication
• Remote monitoring (Siemens Cloud)

HYDRAULIC CIRCUIT

• Integrated free-cooling heat exchangers – within condenser modules – for K4 and L4 configurations
• Primary-side (cold side) circulation pump
• Two primary-side circulation pumps (duty + standby)
• Buffer tank (2 connections) or hydraulic separator (4 connections) on the cold and/or hot side, together with a circulation pump
• Secondary-side (cold side) circulation pump, if a buffer tank is installed
• Hot-side circulation pump, if waste heat recovery is selected
• Y-strainer filter
• Expansion vessel
• Flow meter
• Self-regulating heating cables for frost protection