Vertiv Liebert PFD - Piping and Refrigerant Requirements; Refrigerant Piping Guidelines

4 PIPING AND REFRIGERANT REQUIREMENTS
All refrigeration connections to the unit are sweat copper. Factory-installed piping brackets must not be
removed. Field-installed piping must be installed in accordance with local codes and must be properly
assembled, supported, isolated and insulated. Avoid piping runs through noise-sensitive areas, such as
office walls and conference rooms.
Refer to specific text and detailed diagrams in this manual for other unit-specific piping requirements.
The pipe connection locations, piping general arrangement and schematics are described in the
submittal documents included in the Submittal Drawings on page35.
The following tables list the relevant documents by number and title.
Document Number Title
DPN004060 Piping arrangement, 3-, 4- and 5-ton split-system
Table 4.1 Piping General-arrangment Drawings
Document Number Title
DPN004059 Primary connection locations, top discharge
DPN004064 Primary connection locations, horizontal discharge
Table 4.2 Piping Connection Drawings
4.1 Refrigerant Piping
WARNING! Risk of over-pressurization of the refrigeration system. Can cause explosive
discharge of high-pressure refrigerant, loss of refrigerant, environmental pollution, equipment
damage, injury, or death. This unit contains fluids and gases under high pressure. Use extreme
caution when charging the refrigerant system. Do not pressurize the system higher than the
design pressure marked on the unit's nameplate. Relieve pressure before cutting into or
making connections/disconnections to the piping system.
Do not close off any field-installed, refrigerant-line isolation valves for repairs unless a
pressure-relief valve is field- installed in the line between the isolation valve and the check valve.
The pressure-relief valve must be rated 5% to 10% higher than the system-design pressure. An
increase in ambient temperature can cause the pressure of the isolated refrigerant to rise and
exceed the system-design pressure rating (marked on the unit nameplate).
Consult local building and plumbing codes for installation requirements of additional pressure-relief
devices when isolation valves are field installed. Do not isolate any refrigerant circuits from over-
pressurization protection. The PFD condensing unit includes a factory-installed pressure-relief valve
mounted on top of the receiver. The valve is rated for a maximum working pressure of 675psig.
4 Piping and Refrigerant Requirements 11