sequence of

Operation operation

For units without volume control entering unoccupied mode, the following se- quence will occur:

•The occupied/unoccupied relay ener- gizes and the economizer option fully closes.

•The fan mode is set to auto and the unit will control to the unoccupied zone temperature setpoints.

With MWU enabled at the HI, if the zone temperature is below the MWU setpoint, the unit enters the MWU mode.

Morning Warmup

This feature can be enabled at the HI, and can be used with factory or field-installed heat. If MWU is not required disable the function in the setup menu at the HI. MWU transitions the zone from unoccupied to occupied. It will heat until the MWU setpoint is met. The unit is then released to occupied mode. Supply duct static pressure is maintained during this sequence. MWU can be set (at the HI) to function as either full 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 a more 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. This method of warmup is used to overcome the “building sink” effect.

Reference Figure O-SO-1 on page 73 for a pictorial explanation of the cycling MWU sequence. Cycling capacity MWU will heat until MWU temperature setpoint

is reached. Next a 60 minute timer begins. If the building load reaches the MWU ventilation setpoint, or the 60 minutes expire, whichever is first, the airside economizer will control to the minimum position. MWU will end when the zone temperature rises above the MWU terminate setpoint.

Timed Override Activation - ICS™

This function is operational whenever the unit’s RTM module is used as the zone temperature sensor source, which can be set at the HI panel. When this function is initiated by the push of the override button on the zone sensor, the unit will switch to the occupied mode. Unit operation (occupied mode) during timed override is terminated by a signal from Tracer.

Timed Override Activation - Non-ICS This function is active whenever the unit’s RTM module board is selected as the zone temperature source, which can be set at the human interface panel. When this function is initiated by the push of the override button on the zone sensor, the unit will switch to the occupied mode. Automatic cancellation of the timed override mode occurs after three hours of operation.

VAV Drive Max Output

This is a single-pole, double-throw relay rated at a maximum voltage of 24 vac, two amps max. The relay contacts of this relay switch when the unit goes from the occupied mode to the unoccupied mode by means of the unoccupied binary input, night setback zone sensor, orTracer Summit. The contacts will stay switched during the unoccupied and morning warmup mode. They will return to the position shown on the unit wiring diagram when the unit returns to the occupied mode. The intent of this binary output is to signal theVAV boxes or other terminal devices to go to a full open airflow position.

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Trane SCXG-SVX01B-EN manual Cycling Capacity Morning Warmup MWU, Timed Override Activation ICS
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SCXG-SVX01B-EN specifications

The Trane SCXG-SVX01B-EN is an advanced variable refrigerant flow (VRF) system designed to provide efficient and flexible heating and cooling solutions for commercial and residential applications. This system exemplifies Trane's commitment to innovation, energy efficiency, and ease of installation, making it a standout choice in the industry.

One of the main features of the SCXG-SVX01B-EN is its ability to deliver precise temperature control across multiple zones. The system utilizes a modular design that allows for the connection of multiple indoor units to a single outdoor unit, enabling simultaneous heating and cooling in different areas of a building. This zoned comfort not only enhances occupant satisfaction but also contributes to energy savings by allowing for targeted climate control where it is most needed.

Trane's VRF technology is complemented by its inverter-driven compressors, which adjust their speed according to the demand for heating or cooling. This means that the system operates more efficiently than traditional systems by consuming less energy during partial load conditions. The SCXG-SVX01B-EN also integrates advanced heat recovery capabilities, allowing it to transfer heat from one zone to another, further optimizing energy usage.

The unit's compact design simplifies installation, making it suitable for both retrofit projects and new constructions. The flexible piping layout supports various configurations, allowing easy adaptation to the building's architecture. The model also incorporates intelligent controls, offering a user-friendly interface that enhances operational flexibility and promotes energy management.

In addition to its performance features, the Trane SCXG-SVX01B-EN emphasizes sustainability. It uses advanced refrigerants with low global warming potential (GWP), aligning with environmental regulations and helping to minimize the system's ecological footprint. The durable construction of the system ensures longevity and reliability, reducing maintenance costs and enhancing overall operational efficiency.

Finally, Trane supports its products with comprehensive warranties and a network of service professionals, ensuring that customers have access to expert assistance throughout the life cycle of their system. The SCXG-SVX01B-EN represents a blend of technology, efficiency, and versatility, making it an ideal choice for those seeking an effective heating and cooling solution.
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