TOPDUAL

Medium- and high-capacity liquid chillers / heat pumps

TOPDUAL units are high-efficiency, water-cooled water chillers / heat pumps in a compact design. They are developed to cover cooling and/or heating needs for systems of all sizes. They are intended for indoor installation, while outdoor installation is also possible with certain adaptations and consultation with the manufacturer.

Compressors are semi-hermetic reciprocating types, controlled by frequency inverters that provide soft start and continuous speed variation for accurate regulation of cooling or heating capacity.

TOPDUAL units use double plate heat exchangers with advanced heat-transfer characteristics (SWEP True Dual technology), which connect both refrigerant circuits to a common hydraulic circuit using a single plate heat exchanger. Accordingly, one evaporator and one condenser are required. This design ensures compactness by reducing the number of plate heat exchangers while maintaining maximum heat transfer efficiency—resulting in a significant reduction of the required refrigerant charge.

TOPDUAL units can be designed for high-temperature heating. High-temperature heat pumps use the natural refrigerant R600a to heat water up to 90 °C. Consultation with the manufacturer is required.

Each unit is factory tested and charged with refrigerant and oil. Supervision and conformity assessment of the device (assembly) are carried out in accordance with the European Pressure Equipment Directive (PED) 2014/68/EU. The unit meets safety and environmental requirements.

Number of refrigeration circuits*: 2

*Number of refrigeration circuits equals the number of compressors

Dimensions (with connections):

• Length: 2090 – 3840 mm
• Width: 1100 mm
• Height: 1800 – 2200 mm

❮ ❯

GENERAL

• Cabinet made of powder-coated galvanized sheet metal, providing corrosion and weather resistance; standard color RAL 7035
• Removable cabinet panels
• Anti-vibration mounts
• Compressor compartment located in a separate protective housing within the housing
• Piping insulation to prevent condensation
• Choice of safety strategy — permanent ventilation of the compressor compartment or a refrigerant leak detector combined with an ATEX fan

ELECTRICAL

• Electrical cabinet equipped with a main switch for the entire unit and a phase monitoring relay
• Electrical protections for all components
• Microprocessor controller supervises the complete unit operation
• Touchscreen display for monitoring and controlling unit operation
• Electronic expansion valve enables precise refrigerant flow control
• Available communication protocols: Modbus TCP/IP, Modbus RTU or BACnet IP
• Remote access to the unit

HYDRAULIC CIRCUIT

• Hydraulic circuit piping made of stainless steel
• Hydraulic connection provided via a free stainless steel flange
• Air vent valve
• Safety valve
• Drain valve (for system draining and filling)
• Flow switch
• Thermal insulation of piping

GENERAL

• Selection of a different unit color (powder coating)
• Low-noise version with additional sound insulation
• Waste heat recovery via a separate plate heat exchanger (desuperheater)
• Safety valves

ELECTRICAL

• Option of advanced Siemens Climatix microprocessor controller
• Cabinet lamp with socket
• Electrical cabinet heater (250W)
• Dry contacts for alarms
• ATEX or LED lamp for the compressor housing
• Energy meter
• Remote monitoring (Siemens Cloud)

HYDRAULIC CIRCUIT

• Integration of self-regulating heating cables for freeze protection of piping
• Hydraulic circuit upgrade using hydromodule
• Hydraulic circuit upgrade possible using TOPDUAL hydromodules designed specifically for TOPDUAL units (easy installation, so-called “quick connections”), significantly expanding the application range for all types of cooling or heating systems