GOC754265 -1 - Consulting - HVAC System Air Balance and Recommissioning

The objective of the project is to balance the existing HVAC system throughout the entirety of the building and establish deficiencies with the existing system with recommendations.
 
To complete the scope of work the prime consultant will complete the following actions as part of their design work with a contractor being procured to enact one of the applicable options pending IAR review.
 
During the Schematic Design stage the Consultant is to review the HVAC system (6RTUs and 17AHUs) throughout the Winnipeg Tax Building as well as the buildings chiller, boiler and any associated heating/cooling pumps. This review is to include for an inventory and location of all the VAV boxes and an analysis of the required space air flows and fresh air supplies as per ASHRAE standards. The Prime consultant is to comment on any recommendations for the AHU’s that have the large discrepancy in flow between the Supply and Return fans.  This condition leads to a static pressure imbalance in the building and a large negative pressure in the penthouse as the penthouse acts as a return air plenum. This review is required to determine any deficiencies with the existing systems and provide 3 options (with Class D estimates) as part of the IAR:
 
Option 1: Status Quo.
 
Option 2: Rebalance AHUs and RTUs
• Air balance for each VAV, Supply fan and return fan and rebalance the entire system to return the system to its original design intent.
• Air balancing trade will be responsible for producing a TAB report to include an inventory of each VAV along with Max, min airflows and maximum, minimum and normal operating airflows and pressures for each supply and return fan.  HVAC as builts should be provided with locations of VAV's and VAV schedule as per new air flows.    
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Option 3: Rebalance AHUs and RTUs and System Re-commissioning.
• All RTU, VAV and AHU inputs and outputs being tested and verified by controls technician during the re-commission portion of the work. This includes but is not limited to all DDC inputs (temperatures, pressures, amps, volts, airflow stations etc)  outputs to be tested include confirming calibrations and confirming operation of all  outputs to VAV dampers, vortex dampers, outside air dampers and control valves. 
• A complete re-commissioning report showing initial conditions, final conditions and adjustments to be provided.  Report to include any deficiencies noted including equipment malfunction, not able to calibrate. 
• Also note any design deficiencies as they relate to the air balance of the VAV system and AHU system.
• Air balancing trade will be responsible for producing a TAB report to include an inventory of each VAV along with Max, min airflows and maximum, minimum and normal operating airflows and pressures for each supply and return fan.  HVAC as builts should be provided with locations of VAV's and VAV schedule as per new air flows.   
 
Following completion the consultant is to review and verify the reports.