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