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Wiring
Wire, protect and earth in compliance with local regulations.
Risk of fire and injury due to short-circuits!
●
Adapt the line diameters as per local regulations to the rated value of the installed over-
current protection device.
●
The AC 230 V mains supply line must have an external circuit breaker with a rated cur-
rent of no more than 10 A.
●
Use only valve actuators rated for AC 230 V.
●
Disconnect from supply before removing the unit from its mounting plate.
Commissioning
After power-up, all segments light up for about 3 seconds. The FAU unit starts in Normal
mode (ON) to display the current room temperature, user navigation icons and status of the
application according to its factory settings. Then the unit is ready for commissioning by
qualified HVAC staff.
The control parameters of the fresh air fan controller can be adjusted to ensure optimum per-
formance of the entire system (see Control parameters
External circulation (factory setting)
The unit is set with the factory setting of external circulation (
fan (P53 = 3), i.e. P02 = 1, P24 = 0, P25 = 0 and P26 = 1 (See Control parameters
Alternatively, some fresh air units or purifiers are equipped with ECM fan (P53 = 8). This al-
lows user selection of low, medium and high fan speeds.
Bypass function
When P24 = 1, bypass heat recovery function is enabled, i.e. users can select external circu-
lation without bypass
Internal circulation
When P25 = 1, internal circulation is enabled, i.e. users can select both external circulation
and internal circulation
When P24 = 1 and P25 = 1, users can select all modes (
button
Selection of FAU ECO mode
Except ON/OFF mode selection, users can select different modes for air flow. When P02 = 2
and P25 = 1, users can select FAU ECO mode
With FAU ECO mode is selected with the factory setting of P26 = 1 (1:5), the unit switches to
external circulation for 10 minutes, then internal circulation for 50 minutes within one hour.
The mode setting repeats automatically within one hour. Other ratios can be selected via
P26.
When FAU ECO mode is selected and P24 = 0, operation mode is external circulation with-
out bypass function. Otherwise, when P24 = 1, operation mode is external circulation with
bypass function.
Siemens
Smart Infrastructure
WARNING
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.
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5
2021-04-16
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