Application Considerations
High Capacity Evaporator Coil
Rooftops are popular because of their “packaged” nature. Everything needed is contained in one box;
In order to avoid such occurrences, and to more closely match the rooftop’s capacity to the building load, a high capacity evaporator coil option is available on all IntelliPak® Rooftops 20 to 105 tons.These high capacity coils have an increased number of evaporator coil rows as compared to standard and enhanced evaporator tube surfaces, resulting in a higher capacity. Capacity tables for both standard and high capacity coils are available in the cooling data section of this catalog. SeeTable
Low Ambient Operation — Human Interface Recommendations
Who wants to be on a roof at
Corrosive Atmospheres
Trane’s IntelliPak® Rooftops are designed and built to industrial standards and will perform to those standards for an extended period
depending on the hours of use, the quality of maintenance performed, and the regularity of that maintenance. One factor that can have an adverse effect on unit life is its operation in a corrosive environment.
When rooftops are operated in corrosive environments,Trane recommends that copper fins be utilized on the condenser and/or evaporator coil. Because copper is more resistant to corrosion than aluminum, coil life expectancy is greatly increased. Some industry applications expose equipment to corrosive agents that even copper cannot fully resist. For those special applications, a baked phenolic resin coating (i.e. Heresite) is highly desirable. Baked phenolic coatings or copper fins on the condenser and/or evaporator coils are available on Trane’s IntelliPak Rooftops.
Ventilation Override Sequences
One of the benefits of using an exhaust fan rather than a return fan, in addition to the benefits of lower energy usage and improved building pressurization control, is that the rooftop can be used as part of a ventilation override system. Several types of sequences can be easily done when exhaust fans are a part of the rooftop system.
What would initiate the ventilation override control sequence?Typically, a manual switch is used and located near the fire protection control panel.This enables the fire department access to the control for use during or after a fire. It is also possible to initiate the sequence from a
Trane can provide five (5) different ventilation override sequences on both
CV and VAV IntelliPak® Rooftops. For your convenience the sequences can be factory preset or fully field editable from the Human Interface Panel orTracer®. Any or all five sequences may be “locked” in by the user at the Human Interface Panel.
The user can customize up to five (5) different override sequences for purposes such as smoke control.The following parameters within the unit can be defined for each of the five sequences:
•Supply Fan — on/off
•Inlet GuideVanes — open/closed/ controlling
•Variable Frequency Drives — on (60 Hz)/off (0 Hz)/controlling
•Exhaust Fan — on/off
•Exhaust Dampers — open/closed
•Economizer dampers — open/closed
•Heat — off/controlling (output for)VAV Boxes — open/controlling
Compressors and condenser fans are shut down for anyVentilation Override sequence. Factory preset sequences include unit Off, Exhaust, Purge, Purge with duct pressure control, and Pressurization. Any of the
Natural Gas Heating Considerations
The IntelliPak standard, or limited modulation, gas heat exchangers are not recommended for applications with mixed air conditions entering the heat exchanger below 50°F. Mixed air temperatures below 50°F can cause condensation to form on the heat
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