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VersaTemp™ Water-to-Water Heat Pumps
Multistack VersaTemp™ Heat Recovery Chillers
Multistack ARA VersaTemp units provide all the benets of a Dedicated Heat Recovery Chiller™ (DHRC) including:
• Full cooling capacity with zero need for hot water
• Full simultaneous heating and cooling capacity
• Full heating capacity with zero need for chilled water
• High eective COP ensures reduced operating expense
• Fast payback
• Reduced carbon footprint
• Can be easily combined with select Multistack ASP air-cooled modular chillers (See Pg. 11) plus pump, free cooling and accessory modules
Innovative Design for Maximum Flexibility
• Integrated source-sink/refrigerant-to-air heat exchanger—no need for a well eld or backup heat sinks
• Four-pipe operation with brazed plate condenser sized for full heat rejection—NOT A DESUPERHEATER
• Provides four to six times more heat than a desuperheater
• Built-in automatic controls for full, partial (with multiple modules), or no hot water production; surplus heat is rejected via the integral air-cooled heat
exchanger
Leverages the Advantages of a Modular Design
• Redundant systems up to 600 tons capacity
• EC fan motors (575 volt units require optional transformer) paired with low-sound fan blade technology for quiet operation
• Optional chilled water and/or hot water pumping packages
• Optional tanks, air separators, and accessories
• Integrated controls with multiple connectivity options
ARA VersaTemp units use scroll compressors and are available as 20-, 30- or 60-ton modules which may be assembled into an array to provide the required
jobsite capacity and redundancy. Each module includes two compressors, common single-circuit evaporator, single-circuit refrigerant-to-hot water heat
exchanger, single-circuit air-to-refrigerant heat exchanger, electronic expansion valves, reversing valve, and control system.
Modules are shipped wired and charged with refrigerant and are factory run-tested prior to shipment on an AHRI certied test stand. ARA modules are ETL
listed according to UL Standard 1995, and CSA certied per Standard C22.2#236.
Compressors
Each module includes two hermetic scroll compressors in a tandem piping arrangement mounted to the module with rubber-in-shear isolators. Each system
also includes high discharge pressure and low suction pressure safety cut-outs. Refer to unit nameplate for specic refrigerant charge.
Hot and Chilled Water Heat Exchangers
The evaporator is a brazed plate heat exchanger constructed of 316 stainless steel; designed, tested, and stamped according to UL 1995 code for 650 psig
working pressure. The condenser is a brazed-plate heat exchanger also constructed of 316 stainless steel and designed, tested, and stamped in accordance
with UL 1995 code for 650 psig working pressure.
Refrigerant to Air Heat Exchanger
Each module contains dual (four in ARA 060X) variable speed axial fans. Fan blades are of aluminum construction using ultra-quiet owlet design. Each fan
has seven blades and an integral EC motor (575 V units require optional transformer).
Control System
VersaTemp module operation is controlled by a microprocessor master controller that monitors entering and leaving chilled water and hot water temperatures
to determine both the chilled water and hot water system demand. The control system uses demand to make staging mode decisions (cooling, heating, or
simultaneous heat recovery) and select the needed number of compressors. Mode decisions are available from the controller as well as via remote input.
Response times and set points are adjustable. The master controller provides for variable time between compressor sequencing and temperature sensing in
order to optimize chiller performance and eciency at varying building loads.
Features & Benets
Multistack has a policy of continual improvement and reserves the right to change product design, literature and specica-
tions without notice. For more information on this and other Multistack products, contact your nearest Multistack dealer.
