4 PIPING AND REFRIGERANT REQUIREMENTS
All fluid and refrigeration connections to the unit, with the exception of the condensate drain and
humidifier supply line, 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 page53.
The following tables list the relevant documents by number and title.
Document Number Title
Air-cooled System
DPN004060 Piping arrangement, 3-, 4- and 5-ton split-system
Table 4.1 Piping General-arrangment Drawings
Document Number Title
DPN004801 Primary connection locations, 3-ton DX module
DPN004806 Condensate-pump connection locations, 3-ton
DPN004056 Primary connection locations, 4-ton and 5-ton DX module
DPN004077 Condensate-pump connection locations, 4-ton and 5-ton
Table 4.2 Piping Connection Drawings
4.1 Refrigerant Piping and Charging
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. Local building or plumbing codes may require
installing a pressure-relief device in the system.
CAUTION: Risk of excessive refrigerant line pressure. Can cause tubing and component
rupture resulting in equipment damage and personal injury. 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.
4 Piping and Refrigerant Requirements 15
To Next Page
Loading...