Up to two exhaust fans can be connected to the Economizer Controller.
If Exhaust Fan 1 is connected and configured, Exhaust Fan 1 parameter group (L, M and H) is available depending on fan configuration.
If Exhaust Fan 2 is connected and configured, Exhaust Fan 2 parameter group (L, M and H) is available depending on fan configuration.
The controller energizes Exhaust Fan Relay 1 and Exhaust Fan Relay 2 if the damper position reaches Exhaust Fan 1 parameter setting and Exhaust Fan Relay 2 parameter setting respectively. The selection of L, M or H matches the current fan speed (1FAN SPD LV).
Note that if terminal ACT-FB is configured, the damper position is the damper feedback position. If feedback signal is unavailable, it is the simulated position.
| 1-stage Cooling2) | 2-stage Cooling2) | 3-stage Cooling2) | |
|---|---|---|---|---|
1-speed Fan1) | EX H3) (regardless of cooling demand) | EX H3) (regardless of cooling demand) | EX H3) (regardless of cooling demand) | |
2-speed Fan1) | EX L4) (0 or 1 cooling demand) EX H3) (2 cooling demands) | EX L4) (0 or 1 cooling demand) EX H3) (2 cooling demands) | EX L4) (0 or 1 cooling demand) EX H3) (2 or 3 cooling demands) | |
3-speed Fan1) | EX L4) (0 or 1 cooling demand) EX H3) (2 cooling demands) | EX L4) (0 or 1 cooling demand) EX H3) (2 cooling demands) | EX L4) (0 or 1 cooling demand) EX M5) (2 cooling demands) EX H3) (3 cooling demands) | |
1 | Configured by '6FAN'. | 4 | EX L = Exhaust Fan 1/2 low-speed parameter setting |
2 | Configured by Y1O, Y2O or Y3O. | 5 | EX M = Exhaust Fan 1/2 medium-speed parameter setting |
3 | EX H = Exhaust Fan 1/2 high-speed parameter setting | ||