ERV pivot function in VAV mode - Johnson Controls - LIT-12011950 - Building automation software - Smart Equipment Controller - 5.0

Smart Equipment Controls Sequence of Operation Technical Bulletin

Brand
Johnson Controls
Product name
Smart Equipment Controller
Document type
Technical Bulletin
Document number
LIT-12011950
Version
5.0
Revision date
2024-06-06
Product status
Active
Language
English

Any time the ERV Enable is set to YES the control should never look for a building pressure sensor on any Exhaust Type.

Note: Any time the ERV Enable is set to YES the control should never look for a building pressure sensor on any Exhaust Type
Note: To simplify the programming, when ERV Enable is set to YES the EX VFD output can be programmed to go to 10 vdc when in free cooling and with a call for cooling for both non-pivoting and pivoting ERV’s.

If we follow Note 2, we really only need 2 ERV sequences.

Sequence 1, which covers 3-40 ton constant volume and 3-25 ton VAV units with both non-pivoting and pivoting ERV’s
  • Fan Control Type - Single Speed, Fixed Variable, or Variable Speed
  • Exhaust Type - Non-Modulating
  • ERV Enable - Yes
  • EX FAN output is ON when FAN output is ON in occupied mode
  • EX VFD is at 10 vdc (100%) when FAN output is ON and free cooling is available with a call for cooling
  • No EX FAN or EX VFD output in unocc unless ERV Unoccupied Fan Enabled is Yes
Sequence 2, which covers 25 to 50 ton VAV units and 25-50 ton VAV units with non-pivoting ERV
  • Fan Control Type - Variable Speed
  • Exhaust Type - Variable Frequency Drive
  • ERV Enabled - Yes
  • EX FAN output is ON when FAN output is ON in occupied mode
  • EX VFD output is equal to FAN VFD output