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Space requirements
The ALZ units are air-cooled, hence it is important to observe the minimum distances which guarantee the best
ventilation of the condenser coils. Limitations of space reducing the air flow could cause significant reductions in
cooling capacity, and increase in electricity consumption. The fans do not allow the use of ducts which have high
flow resistance, hence is should be ensured that the output air cannot recycle itself inside the condenser coils. The
units should be positioned such that there is sufficient distance between the coils and any obstacles to improve
ventilation and also to facilitate inspection (fig. 1).
When two or more units are positioned side by side it is recommended that the condenser coils are at least 2500
mm distance from one another (fig. 2). Smaller distances could cause the recirculation of hot air. If the units are
positioned in places surrounded by walls or obstacles of the same height as the units, the units should be at least
2000 mm from said obstacles (fig. 3). In the event the obstacles are higher than the units, the units should be at
least 2500 mm from the obstacle (fig. 4). For other installation solutions, consult McQuay technicians.
Acoustic protection
The low noise levels of the ALZ units means that they meet most of the most restrictive regulations. When the
noise level must meet special requirements it will be necessary to pay the maximum attention to ensure the perfect
insulation of the unit from the support base by applying appropriate vibration-dampening devices, applying
vibration-dampening mounts on the water pipes and on the electrical connections (by the customer).
Water piping
§ Shut-off valves should be provided at the unit so that normal servicing can be accomplished without draining
the system.
§ It is recommended that temperature and pressure indicators are installed at the heat exchangers inlet and
outlet to aid the normal checking and servicing.
§ It is recommended the installation of a wire mesh stainer at the pump suction to protect the pump and the
exchangers from foreign matter.
§ Before insulating the piping and filling the system, a preliminary leak check should be made.
§ Vibration eliminators are recommended in all lines connected to the unit.
§ Automatic flow control devices, although not furnished with the chiller as they are plant components, must be
necessary be installed.
Evaporator and condenser water connections size are 2” for all ALZ units.
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