Assortment / System Description

Room pressurization and fume hood control
Pressurized room, temperature control
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21.7 Pressurized room, temperature control
The pressurized room application can be configured using a pressurized room
application type. Each application type can also combine a radiant/chilled
ceiling or radiator application. The image below provides an overview of the
application type with all possible components that can be configured for a
pressurized room application.
Figure: Application types for pressurized room, temperature control
Key:
DXR2… Automation station B4 Primary air temperature
B1 Return air temperature sensor R1 Room operator unit
B3 Supply air sensor D1 Presence
YC Chilled water cooling coils D2 Window contact
P Pressure sensor YS VAV supply air
YH Hot water heating coils or electric
heating coils
YE VAV extract air
YHC Heating/Cooling coil
21.7.1 Pressurization control
Air flow tracking calculates flow setpoints for supply and extract terminals in a
room to accomplish pressurization. The difference between supply and extract
flows is a fixed, configured value. The setpoints are selected to accomplish
heating, cooling, and ventilation within the constraints of the minimum and
maximum flow rates for the terminals.
Air flow balances room flows that are under its control (typically supply and
extract terminals) and exhaust flows that are independent (for example, fume
hoods).
● Airflow coordination for pressurized rooms, including:
– Single tracking pair (one supply, one extract)
– Lab room with fume hood (one supply, one extract, and fume hood
exhaust)
– Large lab with fume hoods (multiple supply, extract and fume hoods)
Plant diagram
Air volume flow
tracking