45
Operation of Fresh Air Dampers with Environmental Overrides
•
When the Non-ASHRAE Compliant mode is selected (Timed), the system first checks for the outdoor
temperature and dew point to be within the set parameter range before allowing ventilation to occur.
•
When the ventilation changes states (on/off) due to an environmental override, it will remain in that state
for a minimum of 10 minutes before again changing states due to an environmental override.
• Operation is otherwise the same as the ASHRAE compliant method.
• Terminals ACC1 and ACC2 are dry contacts in this mode.
Ventilation Wiring
ACC
1
ACC
2
Wire Jumper required between ON and RED terminals.
LOW
ON
RED
YEL
GRN
HI
COM
NO
NC
BLK
HRV/ERV
Terminal Block
M30
Low Speed
Remove the factory installed jumper between ACC1 and R2
terminals (The on-board 24VAC power source cannot be used.).
R2
For low speed operation only.
On 2-Stage systems requiring high speed operation, move wire from the
terminal block LOW terminal to HI terminal.
Figure 11. ERV / HRV Wiring
See “Table 1. Terminal Designations” on page 7 for further details on each terminal.
