1717 ROCKEFELLER AVE 2022-07-27 - Laserfiche WebLink

Job Name: : W:A- A PrneipTaegd BY4VE1in State Sheet Metal Quantity:1 Variable Frequency Drive Variable Frequency Drives are factory installed and tested to provide supply fan motor speed Modulation. VFDs on the supply fan, as compared to inlet guide vanes or discharge dampers, are quieter, more efficient, and are eligible for utility rebates. All VFDs are designed to allow bypass if required. Bypass control will simply provide full nominal airflow in the event of drive failure. Bypass mode is indicated in the unit wiring manual. Modulating gas heat models with SZVAV allow tighter space temperature control with less temperature swing. Controls Unit shall be completely factory wired with necessary controls and contactor pressure lugs or terminal block for power wiring. Unit shall provide an external location for mounting a fused disconnect device. ReliaTel controls shall be provided for all 24 volt control functions. The resident control algorithms shall make all heating, cooling, and/or ventilating decisions in response to electronic signals from sensors measuring indoor and outdoor temperatures. The control algorithm maintains accurate temperature control, minimizes drift from set point, and provides better building comfort. A centralized control shall provide anti-short cycle timing and time delay between compressors to provide a higher level of machine protection. High Pressure Cutout This option is offered for units that do not have High Pressure cutout as standard. Low Leak Economizer This accessory meets low leak requirements for ASHRAE90.1, IECC, and Title 24 standards; Allows 100 percent outdoor air supply from 0-100 percent modulating dampers; Comes standard with Barometric Relief; can be paired with Powered exhaust for additional building evacuation; Can paired with Fault Detection (FDD) to meet current mandatory Title 24 requirements. Discharge Line Thermostat A bi-metal element discharge line thermostat is installed as a standard option on the discharge line of each system. This standard option provides extra protection to the compressors against high discharge temperatures in case of loss of charge, extremely high ambient and other conditions which could drive the discharge temperature higher. Discharge line thermostat is wired in series with high pressure control. When the discharge temperature rises above the protection limit, the bi-metal disc in the thermostat switches to the off position, opening the 24 VAC circuit. When the temperature on the discharge line cools down, the bi-metal disc closes the contactor circuit, providing power to the compressor. When the thermostat opens the fourth time, the ReliaTel control must be manually reset to resume operation on that stage. Shaft Gounding Ring (FIYSHGR001,002A) 12.5-25 Ton Shaft grounding rings shall be factory installed on all VFD driven motors to provide a conductive discharge path away from the motor bearings to ground. Bearing Protection Ring shall be maintenance free circumferential ring of conductive micro fibers that discharges voltages to ground. Human Interface The Trane Human Interface shall have a 5 inch color touchscreen display that conforms to FCC Part 15 Class B with an Ingress Protection Rating of IP24. The display text shall be readable by a person with 20/20 vision at a distance of 3 feet and 60° angle at lighting levels ranging from 100 lux- 25,000 lux. Also, the display shall operate at temperatures of-40°C to 70°C. Firmware and unit configurations shall be able to be restored via a USB storage device. Sequence of Operation (if applied in a SINGLE-ZONE CONSTANT-VOLUME SYSTEM or a CHANGEOVER BYPASS SYSTEM) B. SINGLE-ZONE CONSTANT-VOLUME SYSTEM