Sequence of

Controls Operation

Control Sequences of

Operation

Morning Warmup

This feature is available on all types of factory-installed heat units and on units with no heat. This function may still be selected to support systems with heat sources not provided by the self- contained unit. At the conclusion of unoccupied mode, the selected zone is heated to the user-defined morning warmup setpoint. The unit is then released to occupied mode. There are two types of morning warmup: full capacity or cycling capacity.

•Full Capacity Morning Warmup (MWU) Full capacity morning warmup uses full heating capacity to heat the zone as quickly as possible. Full heating capacity is provided until the morning warmup setpoint is met. At this point, the unit is released to daytime mode.

•Cycling Capacity Morning Warmup (MWU)

Cycling capacity morning warmup provides gradual heating to overcome “building sink” as the zone is heated. Normal zone temperature control with varying capacity is used to raise the zone temperature to the MWU zone temperature setpoint. Cycling capacity MWU will operate until MWU setpoint is reached or for 60 minutes. Then the unit switches to occupied mode. Cooling will suspend untill building load conditions exceed the MWU setpoint of 3 F (1.7 C), which is field adjustable.

Note: When using the morning warmup option in a heating/cooling self-contained unit in aVAV system, it is important to maintain airflow through the unit. This can be accomplished by electrically tying the VAV boxes to the VAV drive max output relay contacts on the unit’s RTM module board or by using changeover thermostats. Either of these methods will assure adequate airflow through the unit and satisfactory heating.

Ventilation Override (VOM) Option The user can customize up to five different override sequences for purposes of ventilation override control. If more than one VOM sequence is being requested, the sequence with the highest priority is initiated first. Priority schedule

is that sequence “A” (unit off) is first, with sequence “E” (purge with duct pressure control) last.

• UNIT OFF sequence “A”

When complete system shut down is required, the following sequence can be used.

•Supply fan – Off

•Supply fan VFD – Off (0 Hz) (if equipped)

•Inlet guide vanes – closed (if equipped)

•Outside air dampers – Closed

•Heat – all stages – Off, Modulating heat output at 0 vdc

•Occupied/Unoccupied output – Deenergized

•VO relay – Energized

•Exhaust fan (field-installed) - Off •Exhaust damper (field-installed) - Closed

• PRESSURIZE sequence “B”

This override sequence can be used if a positively pressured space is desired instead of a negatively pressurized space. •Supply fan – On

•Supply fan VFD – On (60 Hz) (if equipped)

•Inlet guide vanes/VAV boxes – Open (if equipped)

•Outside air dampers – Open

•Heat – all stages – Off, Modulating heat output at 0 vdc

•Occupied/ Unoccupied output - Energized

•VO relay - Energized

•Exhaust fan (field-installed) - Off •Exhaust damper (field-installed) - Closed

• EXHAUST sequence “C”

With the building’s exhaust fans running and the unit’s supply fan off, the conditioned space becomes negatively pressurized. This is desirable for clearing the area of smoke when necessary; i.e. from an extinguished fire, to keep smoke out of areas that were not damaged. •Supply fan – Off

•Supply fan VFD – Off (0 Hz) (if equipped)

•Inlet guide vanes – Closed (if equipped)

•Outside air dampers – Closed

•Heat – all stages – Off, Modulating heat output at 0 vdc

•Occupied/Unoccupied output – Deenergized

•VO relay – Energized

•Exhaust fan (field-installed) - On •Exhaust damper (field-installed) - Open

• Purge sequence “D”

This sequence could be used for purging the air out of a building before coming out of unoccupied mode of operation onVAV units. Also, it can be used to purge smoke or stale air.

•Supply fan – On

•Supply fan VFD – On (60 Hz) (if equipped)

•Inlet guide vanes/VAV boxes – Open (if equipped)

•Outside air damper – Open

•Heat – all stages – Off, Modulating heat output at 0 vdc

•Occupied/Unoccupied output – Energized •VO relay – Energized

•Exhaust fan (field-installed) - On •Exhaust damper (field-installed) - Open

•Purge with duct pressure control “E” This sequence can be used when supply air control is required for smoke control.

•Supply fan – On

•Supply fan VFD – On (if equipped) •Inlet guide vanes – controlled by supply

air pressure control function with supply air pressure high limit disabled

•Outside air dampers – Open

•Heat – all stages – Off, Modulating heat output at 0 vdc

•Occupied/Unoccupied output – Energized •VO relay – Energized

•Exhaust fan (field-installed) - On •Exhaust damper (field-installed) - Open

Note: Each system (cooling, exhaust, supply air, etc.) within the unit can be redefined in the field for each of the five sequences, if required. Also the definitions of any or all of the five sequences may be locked into the software by simple key strokes at the human interface panel.

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Trane PKG-PRC002-EN manual Controls Operation, Control Sequences Operation
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PKG-PRC002-EN specifications

The Trane PKG-PRC002-EN is a groundbreaking packaged rooftop unit designed to meet the diverse needs of commercial and industrial spaces. This model showcases Trane’s commitment to innovation, energy efficiency, and reliability, making it a preferred choice for HVAC professionals and building owners alike.

One of the main features of the PKG-PRC002-EN is its high-efficiency design. This unit leverages advanced technologies to minimize energy consumption while ensuring optimal cooling and heating performance. Its efficient compressor, coupled with enhanced heat exchangers, significantly reduces operating costs and energy bills, aligning with today’s sustainability goals.

The PKG-PRC002-EN features a robust and durable construction, which translates to enhanced longevity and reduced maintenance requirements. Designed for ease of installation, the unit is compact and lightweight, facilitating seamless retrofitting and integration into existing systems. Furthermore, its accessible service panels allow for straightforward maintenance and repairs, thus minimizing downtime and service disruptions.

Equipped with Trane's advanced control technology, the PKG-PRC002-EN offers precise temperature management, ensuring consistent comfort across different zones within a building. The intuitive controls enable users to program schedules and adjust settings based on their specific needs, enhancing comfort while maximizing efficiency.

The model also incorporates advanced filtration options, improving indoor air quality by effectively reducing pollutants and allergens. This focus on health and safety is essential, especially in commercial settings where air quality can significantly impact occupant well-being and productivity.

Another notable characteristic of the PKG-PRC002-EN is its low noise levels during operation, which is essential for maintaining a conducive indoor environment in workplaces, retail spaces, or educational institutions. The unit's design minimizes sound transmission, creating a more pleasant atmosphere for occupants.

In summary, the Trane PKG-PRC002-EN is a highly efficient, reliable, and user-friendly rooftop unit that combines advanced technology with robust construction. Its energy-saving features, superior air quality options, and focus on quiet performance make it an excellent choice for modern commercial HVAC applications, ultimately contributing to sustainable building practices and enhanced occupant comfort.
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