Page 27 - 14th @ Irving Basis of Design (internal)

7. A CO 2 detection and monitoring system will be provided for a demand controlled ventilation. The outdoor air processing unit
will be controlled between the minimum and maximum air flows based on the space CO 2 levels.

8. The outdoor air processing (ventilation) unit will be a VRF type heat pump and will be located in mechanical rooms on the
level served. Each outdoor air processing unit will consist of an inlet air box, pre-filters and final filters and a variable speed
supply fan. Each ventilation unit will be provided with a pre-heat coil capable of maintaining the air temperature at the unit
air intake at approximately 30 degrees F when the outdoor temperature is 0 degrees F.

TYPICAL EDUCATIONAL FLOOR AIR CONDITIONING SYSTEM
1. Each educational floor will be served by multiple outdoor VRF units and multiple indoor fan coil units.

2. The outdoor VRF units will be located in a plenum on the floor they serve. Each plenum will be protected from the elements by
stormproof louvers. The outdoor VRF units will be free standing within the plenum for a non-ducted air intake with a ducted
connection from the fan discharge to the louvers.

3. The combined capacity of the VRF system providing comfort cooling and heating to a typical office floor is estimated at 28
tons.
4. Multiple indoor fan-coil units will be provided to serve classrooms, private offices, open spaces and conference rooms. Multiple
branch circuit controllers will be provided to facilitate energy recovery between the units serving each floor. The system
diversity factor will not exceed 120%.
5. In addition to the 3-pipe refrigerant distribution system, each indoor fan coil unit will be provided with a condensate pump.
The condensate will be piped back to the nearest mechanical room.
6. Outdoor air will be delivered via one local outdoor air processing (ventilation) unit to provide outdoor air for occupants and
for make-up air exhausted from the toilets. An additional outdoor VRF Unit will be provided on each floor to serve the outdoor
air processing units.
7. A CO 2 detection and monitoring system will be provided for a demand controlled ventilation. The outdoor air processing unit
will be controlled between the minimum and maximum air flows based on the space CO 2 levels.
8. The outdoor air processing (ventilation) unit will be a VRF type heat pump and will be located in mechanical rooms on the
level served. Each outdoor air processing unit will consist of an inlet air box, pre-filters and final filters and a variable speed
supply fan. The ventilation unit will be provided with a pre-heat coil capable of maintaining the air temperature at the unit air
intake at approximately 30 degrees F when the outdoor temperature is 0 degrees F.

EVENT FLOOR AIR CONDITIONING SYSTEM

1. The event floor will be served by multiple outdoor VRF units and multiple indoor fan coil units.
2. The outdoor VRF units will be located in a plenum on the floor they serve. Each plenum will be protected from the elements by
stormproof louvers. The outdoor VRF units will be free standing within the plenum for a non-ducted air intake with a ducted
connection from the fan discharge to the louvers.
3. The combined capacity of the VRF system providing comfort cooling and heating to an event floor is estimated at 42 tons.
4. Multiple indoor fan-coil units will be provided to serve the event floor. Multiple branch circuit controllers will be provided to
facilitate energy recovery between the units serving each floor. The system diversity factor will not exceed 120%.

5. In addition to the 3-pipe refrigerant distribution system, each indoor fan coil unit will be provided with a condensate pump.
The condensate will be piped back to the nearest mechanical room.
6. Outdoor air will be delivered via one local outdoor air processing (ventilation) unit to provide outdoor air for occupants and
for make-up air exhausted from the toilets. An additional outdoor VRF Unit will be provided on each floor to serve the outdoor
air processing units.
7. A CO 2 detection and monitoring system will be provided for a demand controlled ventilation. The outdoor air processing units
will be controlled between the minimum and maximum air flows based on the space CO 2 levels.

14th @ IRVING WSP
Project No. B1809809.000
RAL COMPANIES & AFFILIATES Page 27