A CU MANUAL
IOM-14 7 of 46 Feb 06 R4
The minimum clearance for proper air flow is 60” (1500 mm) to obstructions and 96” (2400
mm) to an adjacent condensing unit or air conditioning unit.
QUALIFIED INSTALLER
To complete the installation, an air-conditioning contractor experienced and qualified in system piping is
required. The contractor is responsible for the design, selection and installation of the refrigeration
specialties and refrigerant piping for this equipment. The following information is intended to provide
general information and guidelines for the successful installation of this equipment.
For detailed information about installation practices consult ASHRAE handbooks, ANSI/ASME Codes,
ANSI/ASHRAE Safety Code for Mechanical Refrigeration, CAN/CSA B52 Mechanical Refrigeration Code and
any local authorities having jurisdiction.
Component selection, piping design and installation of the air conditioning system are the
responsibility of the installing contractor. This manual is designed to provide general
guidelines and recommendations only. It is not intended to be a complete manual for air
conditioning design.
COMPONENT LOCATIONS
Consider the issues related to your installation and the relative location of the components.
Locate the condensing unit as close as practical to the evaporator section. Shorter refrigerant piping will
always result in a lower refrigerant charge, greater reliability and longer system life.
Considerations for different arrangements.
Three arrangements are possible:
1. Condensing unit above evaporator
2. Condensing unit is on the same level as evaporator.
3. Condensing unit below evaporator.
1. Condensing Unit Above The Evaporator
In this orientation, the suction gas must travel up a riser to get to the condensing unit. The suction riser
must be correctly sized to ensure proper oil return. Traps are required at the bottom of all risers. Double
risers may be required on systems with tandem compressors or unloaders. Refer to ASHRAE Refrigeration
Handbook for information on double risers.
The liquid line will have a vertical drop in this orientation and gravity will aid in taking the liquid to the
evaporator section. The liquid refrigerant will GAIN pressure at the rate of one half a psig per foot of
vertical drop. If the drop is considerable, this pressure gain may affect the sizing of the TX valve.
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