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9
McQuay Water Source Heat Pump (M5WSS) system is one of the most efficient and high performance
systems that can move energy in a building from where it is not needed to where it is needed. It is perfect for
buildings that required heating and cooling operation at different zones. With this, different areas or zoned
can be heated or cooled at different temperature simultaneously. The heat is rejected and added in a water
loop using a cooling tower and a boiler. The units are easy to install, operate and maintain.
Energy Saving
M5WSS and M5WST are the most efficient systems available for heating and cooling. It will be very cost
effective for seasonal operation and can provide greater indoor comfort to the occupants. With the lower
power consumption, the operation and maintenance cost is very much lower than the conventional air-
conditioning systems.
Environmental Friendly
Refrigerant R410A is used in the M5WSS and M5WST units. It is a non-ozone depleting hydro-fluorocarbon
(HFC) new refrigerant that has a higher efficiency and has no schedule phase out date. It is non-flammable
and low toxic refrigerant and is rated as A1 by the ASHARE refrigerant classifications.
Easy Installation and Improve Aesthetics
The unit has a great flexibility for installation. With a compact design and a low height profile, it can easily fit
the required space layout and allow maximum use of space. The units are concealed from the occupant
views as the units are installed above the ceiling and are sheltered inside the building. The units are painted
as well. It will improve the aesthetics value of a particular building and eliminates the probability of vandalism
and injury.
Quiet Operation
M5WSS and M5WST are developed with double isolation panel (Upper and Lower Panel). Such design has
promised the extremely low vibration on the unit itself. Moreover, the heavy gauge cabinet construction
together with vibration isolated hanger brackets also minimizes noise and vibration effectively.
Easy Servicing and Maintenance
The two side removable service panels provide easy access to the compressor as well as the heat exchanger.
Fluid-to-Refrigerant Coil
The tube-in-tube coaxial heat exchanger applied in M5WSS and M5WST unit is designed for maximum heat
transfer at normal and low water flow rate with minimum pressure drop. The inside refrigerant tube is deeply
fluted to enhance heat transfer and minimize fouling. This coaxial heat exchanger is tested perfectly to 1600
psig on the water side and refrigerant side.
Compressor
M5WSS and M5WST units are designed around the most advanced compressors in the industry, which can
deliver a wide range of selection for R410A non-CFC refrigerants. The rotary compressor (for sizes 2.37kW
to 8.94kW) and scroll compressor (for sizes 11.58kW to 15.77kW) give a quite and reliable performance
over a wide operating temperature range.
Thermal Expansion Valve (TXV)
M5WSS and M5WST units (for sizes 8.94kW to 15.77kW) are included with a thermal expansion valve for
refrigerant metering. It can precisely control the exact amount of refrigerant flow through the system to
deliver rated cooling and heating capacity.
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