Piping Connections; Ducting; Table 17 Indoor Condensing Unit Airflow, Cfm At 0.5 Iwg Esp - Liebert Mini-Mate2 MMD24E User Manual

5.6.3

Piping Connections

Details for refrigerant (R-407C) loop piping are in 5.5.3 - Piping Connections and Coolant
Requirements.
5.6.4

Ducting

The total external static pressure for the inlet and outlet ducts, including grille, must not exceed 0.5
inches of water.
General Considerations
Use flexible ductwork or nonflammable cloth collars to attach ductwork to the unit and to control
vibration transmission to the building. Attach the ductwork to the unit using the flanges provided.
Locate the unit and ductwork so that the discharge air does not short circuit to the return air inlet.
Ductwork that runs through a conditioned space or is exposed to areas where condensation may occur
must be insulated. Ductwork should be suspended using flexible hangers. Ductwork should not be
fastened directly to the building structure.
For multiple unit installations, space the units so that the hot condensing unit exhaust air is not
directed toward the air inlet of an adjacent unit.
Considerations for Specific Applications
In applications where the ceiling plenum is used as the heat rejection domain, the discharge
air must be directed away from the condensing unit air inlet and a screen must be added to the end of
the discharge duct to protect service personnel. Locate the air discharge a minimum of 4 feet from an
adjacent wall. Failure to do so may result in reduced air flow and poor system performance.
If the condensing unit draws air from the outside of the building, rain hoods must be
installed. Hood intake dimensions should be the same as the condensing unit duct dimensions. In
addition, install a triple layer bird screen over rain hood openings to eliminate the possibility of
insects, birds, water, or debris entering the unit.Avoid directing the hot exhaust air toward adjacent
doors or windows.
Table 17 Indoor condensing unit airflow, CFM at 0.5 iwg esp
2 Ton
1000
3 Ton
1430
31
Site Preparation and Installation
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Liebert Mini-Mate2
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