Daikin EWAH TZ D Series Installation, Operation And Maintenance Manual page 30

There are specific situations which include multiple chiller installations. In this case the following recommendations are to be
followed.
Multiple chiller installed side by side in a free field with dominant wind.
Considering an installation in areas with a dominant wind from a specific direction (as shown in the Fig.22):
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Chiller N°1: is performing normally without any ambient over-temperature
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Chiller N° 2: is working in a warmed ambient. The first circuit (from the left) is working with air recirculating from
Chiller 1 and the second circuit with recirculating air from the chiller N°1 and recirculation from itself.
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Chiller N° 3: circuit on the left is working in a over-temperature ambient due to the recirculating air from the other
two chillers, circuit on the right is working quite normally.
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In order to avoid the hot air recirculation due to dominant winds, the installation where all chillers are aligned to the
dominant wind is preferred (see figure below).
Multiple chiller installed side by side in a compound.
In case of compounds with walls of the same height of the chillers or higher, the installation is not recommended.
Chiller 2 and chiller 3 work with sensible higher temperature due to the enhanced recirculation. In this case special
precautions must be taken into account according to the specific installation (eg: louvered walls, install the unit on base
frame in order to increase the height, ducts on the discharge of the fans, high lift fans, etc).
All the above cases are even more sensitive especially when design conditions are close to the limits of the unit operating
envelope.
NOTE: Daikin cannot be considered responsible in case of malfunctions generated by hot air recirculation or insufficient
airflow as result of improper installation if the above recommendations are ignored.
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