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Design & installation Guide For McQuay MDS Multi System
4.4.5 The main drainage pipe of multiple indoor units
■ The pipe should be mounted from the upstream, and the diameter of the downstream connecting
pipe should be as long as possible.
■ The pipe should be as short as possible and the number of the indoor units must be as small as
possible.
4.4.7 Key points
■ The diameter of the condensate pipe should be more than or equal to that of the drainage pipe.
■ The condensate pipe should be insulated.
■ The lift pipe of the condensate pipe should be installed before the indoor unit. When the unit is
running, if there is water in the condenser collector, please check whether the condensate pump
is working properly.
■ All the connecting wiring should be solid (especially the PVC pipe).
4.4.6 Accessory condensate pipe (hose)
If the condensate collector is made of polystyrene, it should use the hose. The condensate pipe
box can easily connect with the condensate pipe to prevent the condensate coil distorted