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Fabricante : Trane Arquivo Tamanho: 1.88 mb Arquivo Nome : Língua de Ensino:

For units with supply air temperature control entering the unoccupied mode, the following sequence will occur: • Heating/cooling functions cease and the economizer option closes fully.The supply fan shuts down for proper cool- down time of the heat exchanger. However, the supply fan may remain on for a short period of time. • After the supply fan shuts down, the occupied/unoccupied relay energizes and the IGV option fully opens. Also, the VAV box stroke time begins. The VAV box stroke time is field adjustable to allow time for VAV boxes to go to the full open airflow position. •After the max VAV box stroke time expires and the IGVs are fully open, the supply fan, economizer (if enabled), compressors, and heat enable to satisfy the unoccupied zone temperature setpoints. Note: Unoccupied economizer operation can be enabled or disabled at the HI or using Tracer Summit®. For units without volume control entering the unoccupied mode, the following sequence will occur: • The occupied/unoccupied relay energizes and the economizer option fully closes. • The fan mode is set to auto and the unit will control to the unoccupied zone temperature setpoints. 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 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. when the RTM receives a closed signal Figure O-SO-1.Typical cycling morning warmup cycle. With MWU enabled at the HI, if the zone SCXG-SVX01B-EN Sequence of Owner Operation 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, 2 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, or Tracer 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 the VAV boxes or other terminal devices to go to a full open airflow position. SCXG-SVX01B-EN Sequence of Owner Operation Occupied Sequence Of Operation All setpoints can be adjusted using the HI panel. Also, cooling/heating setpoints can be adjusted in the zone, if using one of the zone sensor options (BAYSENS020, BAYSENS021, BAYSENS008, BAYSENS010, BAYSENS019, or BAYSENS014). For a complete list of unit setpoint default values and ranges, see the IntelliPak®Self-Contained Programming Guide, PKG-SVP01B-EN. Occupied Zone Temperature - Cooling The unit transitions from unoccupied to occupied when the occupied/unoccupied input on the RTM is open for more than five seconds after having been closed. This input can be received from Tracer S...

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