Settings of these parameters, P02 and P25 determine RDF280.VXX.. functionality:

P02
ON, FAU-ECO, OFF

P25
EXT/INT

Available function & user adjustment

Typical applications / equipment

Factory settings

1

0

  • Operating mode (): ON, OFF
  • Fan speed: 1, 2, 3
  • Air circulation mode is fixed:
    1. External

Single duct fresh air unit (FAU)

1

1

  • Operating mode (): ON, OFF
  • Fan speed: 1, 2, 3
  • Air circulation mode via manual selection:
    1. External
    2. Internal

Dual duct FAU only

2

0

  • Operating mode (): ON, OFF (since P25 = 0, no ECO mode)
  • Fan speed: 1, 2, 3
  • Air circulation mode is fixed:
    1. External

Single duct fresh air unit (FAU)

2

1

  • Operating mode (): ON, FAU ECO, OFF
  • Fan speed: 1, 2, 3
  • Air circulation via manual selection when ON mode is selected:
    1. External
    2: Internal
  • When FAU ECO mode is selected with P25 = 1, air circulation automatically switches between
    1. External
    2. Internal

During FAU-ECO mode, ECO is displayed and user operations under FAU-ECO are:

  • Press once to display two current air circulation icons (external and internal ) and P26 selected value: 1…5.
  • Press or to change the P26 ratios as per the P26 value range
    E.g.
    press : 1-5 > 2-4 > 3-3 > 4-2 > 5-1 > 1-5 > 2-4 > …
    press : 1-5 > 5-1 > 4-2 > 3-3 > 2-4 > 1-5 > 5-1 > …

In FAU-ECO mode, if users select other icons like fan , On/Off , they can edit fan speed/mode or turn on/off devices and all new settings for FAU-ECO mode are saved. If users wait for timeout, all new settings are saved, and the device returns to normal.

Dual duct FAU only