McQuay MDS300B Instalační příručka Strana 78

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Design & installation Guide For McQuay MDS Multi System
4.2.2 Parallel Unit Installation (For MDS260/280/300)
The parallel unit means to connect two outdoor units as an integrated unit to connect the indoor
unit. The installation of the parallel unit is more complex than that of a single unit. Please read this
manual carefully before installation, and install according to the instructions.
Outdoor unit installation location
The parallel unit is divided into master unit and slave unit. Place the master unit and slave unit
side by side in order.
The master unit and slave unit must be kept in the same level.
Leave some gap between the side panels of the master/slave unit. More than 10 mm is
recommended.
Connection of Pipelines for the Outdoor Unit
A package of copper fittings for pipeline installation is delivered with the master unit. Please
check it for future use. The connection of parallel unit pipelines includes parallel connection of
the gas pipe and liquid pipe and the connection of the system balance pipe between the master
unit and the slave unit. The system balance pipe must be connected. Take good protection and
insulation measures for the pipelines to avoid pipeline friction and damage.
Parallel connection of the gas pipe and liquid pipe
For the connection between the gas/liquid pipe and the unit, refer to the section Install
Refrigerant Pipe.
The parallel connection of the gas pipe and liquid pipe is shown in the figure below. The straight
pipe for tee connection must satisfy the dimension requirements in the figure below.
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