1034333-270162 - Guelph Lab Air Handling Units Replacement

This project will be an undertaking of full renewal of three air handling units and all associated electrical and BAS at 95 Stone Road W, Guelph.  Scope of work includes but not limited to:

1. New AHU`s are designed to match original AHU bases of design:
   1. Air flow 28,260 l/s (each unit). Maintaining the same size units will provide a 10% spare capacity. These units will have VFD on fan motors and will vary speed to meet conditions on floors.
   2. Maintain space set point 21C & 30%RH
   3. Coil performance for all heating and cooling coils
2. Provide the summer/winter pre filter rack
   1. In summer pre-filter will be the first component in AHU
   2. In winter, filters are downstream of the secondary heating coil (recommended), first coil to melt snow and collect the moisture, most of it will evaporate, however a drain pan will be specified, and over size coil at 500fpm this will further eliminate moisture carry over to secondary heating coil and possibly into pre-filter.

1. All AHUs to work in unison for humidity control.
2. Provide individual p-traps for each drain from AHU, this will solve the ahu flooding, cut slab on grade and provide a deep pocket box for drain p-traps to be located.
3. LAT reset is recommended as well, and an elevated temperature setpoint in winter will assist with humidity control.
4. New steam humidifier with proper absorption distance to ensure steam has the ability to be absorbed in the airstream.
5. All drain pans specified to be stainless steel construction.
6. Implement controls for AHU’s which directly control the AHU’s performance. All new controls related to the AHU’s unit including electric actuators for water valves and dampers. Siemens will be involved during detailed design to establish implementation of controls integration to existing BAS. Identify any new control equipment (controllers) required for the integration. 
   The design for this project is 98% complete.
    
   It is anticipated that construction will commence in May 2018 and will be completed no later than April 2019.