The Economizer Controller supports connection to 2- and 3-speed fans. When the unit is equipped with a multi-speed fan, the damper responds to multiple fan speeds via multiple minimum positions (MIN POS) to keep minimum airflow.

A multi-speed fan is not controlled by the Economizer Controller but an external logic board.

Damper MIN POS for 2-Speed Fan (Cooling, No W1 or O/B)

Y1

Y2

Spd L1)

Spd H2)

PosL3)

PosH4)

x

-

x

-

x

-

x

x

-

x

-

x

Damper MIN POS for 2-Speed Fan (Heating, With W1 or O/B)

Y1

Y2

W1

(Heating)

OB = B (Heating)

Spd L1)

Spd H2)

PosL3)

PosH4)

x

-

-

x

x

-

-

x

x

x

-

x

-

x

-

x

-

-

x

-

-

x

-

x

1

Spd L = Low Speed (Fan)

3

PosL = Damper MIN POS for Low-Speed Fan

2

Spd H = High Speed (Fan)

4

PosH = Damper MIN POS for High-Speed Fan

Damper MIN POS for 3-Speed Fan (Cooling, No W1 or O/B)

Y1

Y2

Y3

Spd L1)

Spd M2)

Spd H3)

PosL4)

PosM5)

PosH6)

x

-

-

x

-

-

x

-

-

x

x

-

-

x

-

-

x

-

x

x

x

-

-

x

-

-

x

Damper MIN POS for 3-Speed Fan (Heating, With W1 or O/B)

Y1

Y2

Y3

W1

(Heating)

OB = B (Heating)

Spd L1)

Spd M2)

Spd H3)

PosL4)

PosM5)

PosH6)

x

-

-

-

x

x

-

-

-

-

x

x

x

-

-

x

-

x

-

-

-

x

x

x

x

-

x

-

-

x

-

-

x

-

-

-

x

-

-

-

x

-

-

x

1

Spd L = Low Speed (Fan)

4

PosL = Damper MIN POS for Low-Speed Fan

2

Spd M = Medium Speed (Fan)

5

PosM = Damper MIN POS for Medium-Speed Fan

3

Spd H = High Speed (Fan)

6

PosH = Damper MIN POS for High-Speed Fan

If a single-speed fan connects to the Controller, the fan speed is Spd H. The damper position is PosH.

Different Fan Speeds with Different Configured Outputs

 

1-stage Cooling2)

2-stage Cooling2)

3-stage Cooling2)

1-speed Fan1)

Spd H3) (regardless of cooling demand, OCC=Yes)

Spd H3) (regardless of cooling demand, OCC=Yes)

Spd H3) (regardless of cooling demand, OCC=Yes)

2-speed Fan1)

Spd L4) (0 or 1 cooling demand)

Spd H3) (2 cooling demands)

Spd L4) (0 or 1 cooling demand)

Spd H3) (2 cooling demands)

Spd L4) (0 or 1 cooling demand)

Spd H3) (2 or 3 cooling demands)

3-speed Fan1)

Spd L4) (0 or 1 cooling demand)

Spd H3) (2 cooling demands)

Spd L4) (0 or 1 cooling demand)

Spd H3) (2 cooling demands)

Spd L4) (0 or 1 cooling demand)

Spd M5) (2 cooling demands)

Spd H3) (3 cooling demands)

1

Configured by '6FAN'.

4

Spd L = Low Speed (Fan)

2

Configured by Y1O, Y2O or Y3O.

5

Spd M = Medium Speed (Fan)

3

Spd H = High Speed (Fan)

If a variable-speed fan is configured, the fan speed control logic is the same with 3-speed fan.

Different Damper Minimum Positions with Different Configured Outputs

 

1-stage Cooling2)

2-stage Cooling2)

3-stage Cooling2)

1-speed Fan1)

PosH3) (regardless of cooling demand, OCC=Yes)

PosH3) (regardless of cooling demand, OCC=Yes)

PosH3) (regardless of cooling demand, OCC=Yes)

2-speed Fan1)

PosH3) (regardless of cooling demand, OCC=Yes)

PosL4) (0 or 1 cooling demand)

PosH3) (2 cooling demands)

PosL4) (0 or 1 cooling demand)

PosH3) (2 or 3 cooling demands)

3-speed Fan1)

PosH3) (regardless of cooling demand, OCC=Yes)

PosL4) (0 or 1 cooling demand)

PosH3) (2 cooling demands)

PosL4) (0 or 1 cooling demand)

PosM5) (2 cooling demands)

PosH3) (3 cooling demands)

1

Configured by '6FAN'.

4

PosL = Damper MIN POS for Low-Speed Fan.

2

Configured by Y1O, Y2O or Y3O.

5

PosM = Damper MIN POS for Medium-Speed Fan.

3

PosH = Damper MIN POS for High-Speed Fan.

If DCV (demand control ventilation) is enabled, each fan speed corresponds to two damper position ventilation setpoints (VENT MIN, VENT MAX), e.g., PosL corresponds to 2VENTMIN L... 2VENTMAX L.

Different Damper Position Setting with Different Configured Outputs (DCV is Enabled)

 

1-stage Cooling2)

2-stage Cooling2)

3-stage Cooling2)

1-speed Fan1)

2VENTMIN H to 2VENTMAX H (regardless of cooling demand, OCC=Yes)

2VENTMIN H to 2VENTMAX H (regardless of cooling demand, OCC=Yes)

2VENTMIN H to 2VENTMAX H (regardless of cooling demand, OCC=Yes)

2-speed Fan1)

2VENTMIN H to 2VENTMAX H (regardless of cooling demand, OCC=Yes)

2VENTMIN L to 2VENTMAX L (0 or 1 cooling demand)

2VENTMIN H to 2VENTMAX H (2 cooling demands)

2VENTMIN L to 2VENTMAX L (0 or 1 cooling demand)

2VENTMIN H to 2VENTMAX H (2 or 3 cooling demands)

3-speed Fan1)

2VENTMIN H to 2VENTMAX H (regardless of cooling demand, OCC=Yes)

2VENTMIN L to 2VENTMAX L (0 or 1 cooling demand)

2VENTMIN H to 2VENTMAX H (2 cooling demands)

2VENTMIN L to 2VENTMAX L (0 or 1 cooling demand)

2VENTMIN M to 2VENTMAX M (2 cooling demands)

2VENTMIN H to 2VENTMAX H (3 cooling demands)

1

Configured by '6FAN'.

2

Configured by Y1O, Y2O or Y3O.

If CO2 sensor is connected but DCV is disabled, each fan speed corresponds to one minimum damper position ventilation setpoint.

Different Damper Position Setting with Different Configured Outputs (DCV is Disabled, CO2 sensor is connected)

 

1-stage Cooling2)

2-stage Cooling2)

3-stage Cooling2)

1-speed Fan1)

2VENTMIN H (regardless of cooling demand, OCC=Yes)

2VENTMIN H (regardless of cooling demand, OCC=Yes)

2VENTMIN H (regardless of cooling demand, OCC=Yes)

2-speed Fan1)

2VENTMIN H (regardless of cooling demand, OCC=Yes)

2VENTMIN L (0 or 1 cooling demand)

2VENTMIN H (2 cooling demands)

2VENTMIN L (0 or 1 cooling demand)

2VENTMIN H (2 or 3 cooling demands)

3-speed Fan1)

2VENTMIN H (regardless of cooling demand, OCC=Yes)

2VENTMIN L (0 or 1 cooling demand)

2VENTMIN H (2 cooling demands)

2VENTMIN L (0 or 1 cooling demand)

2VENTMIN M (2 cooling demands)

2VENTMIN H (3 cooling demands)

1

Configured by '6FAN'.

2

Configured by Y1O, Y2O or Y3O.