Siemens RDF270 Bedienungsanleitung

Fresh air fan controller with touch buttons

RDF270

Fresh air unit (FAU)

●Slim (8 mm thickness) touch button design

●AC 230 V supply voltage, large LCD backlit display

●Separate ON and OFF power button

●Fan type selection: 3-speed or ECM

●Manual fan speed adjustment at max. 3 speeds

●Mode of operations: Internal and external air circulations

●Bypass function for external air circulation

●Special FAU ECO mode for fresh air flow control

●Simple delay-off timer for max. 23 hours

●Keylock function

●Returning to previous operating mode, ON (Normal mode) or OFF for power down

●Adjustable commissioning and control parameters

●Mounting on recessed square 86 mm box with 60.3 mm fixing centers and mini-

mum 50 mm depth

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Use

Ventilation control and indoor air quality control in purifier systems:

Typical applications:

●Residential homes and apartments

●Offices & Hotels

Functions

●Operating mode selection via button or parameter (P02)

–ON (Normal mode), FAU ECO and OFF

●Key lock function: Lock and unlock (P14)

●Fan type selection (P53)

–3-speed or ECM fan (DC 0...10 V)

Advanced functions

●Enable BYPASS function for external air circulation (P24)

●Enable selection of internal and external air circulations (P25)

●Select fresh air flow control via FAU ECO mode (P02 = 2, P26)

●Operating mode after power resumed: Previous mode, ON or OFF (P27)

●Enable delay-off timer: up to 23 hours (P28)

●Set maximum and minimum fan output for ECM fan (P55, P56)

●Set minimum on-time for fan (P59) –3-speed fan only

●Reload factory settings for commissioning and control parameters (P71)

●Enable Chinese text display (P98)

Mechanical design

The FAU unit consists of two parts:

●LCD display

●Mounting plate to fit onto a square conduit box with 60.3 mm fixing centers.

Operating and setting elements

Chinese text display can be disabled via P98.

Note

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Symbol

Description

Symbol

Description

FAU ECO mode

Manual fan mode

Alarm / Service

reminder

Delay-off timer

Keylock

Internal circulation

External circulation

without bypass

External circulation with

bypass

Parameter values, etc.

Secondary display

Select or move to next

item

Confirm

Cancel or return

Home

Increase, decrease or

select

Fan or fan speed mode

Setting

On/Off

Type summary

Product no.

Stock no.

Operating volt-

age

Description

RDF270

S55770-T441

AC 230 V

Fresh air fan controller with touch

buttons

Ordering

When ordering, specify both product number / stock number and name: e.g. RDF270 /

S55770-T441 FAU unit

Product documentation

Title

Document ID

Operating instruction

A6V12101240

CE declaration

A5W00161028A

RCM

A5W00161038A

Environmental product declaration

A5W00159015A

Related documents such as environmental declarations, CE declarations, etc., can also be

downloaded at the following Internet address:

http://siemens.com/bt/download

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Notes

Security

CAUTION

National safety regulations

Failure to comply with national safety regulations may result in personal injury and property

damage.

●Observe national provisions and comply with the appropriate safety regulations.

Mounting and installation

●The devices are suitable for wall mounting.

●Recommended height: 1.5 m above the floor.

●Do not mount the devices in recesses, shelves, behind curtains or doors, or above or

near heat sources.

●Avoid direct solar radiation and drafts.

●Avoid unheated (uncooled) building area such as outside walls.

●Seal the conduit box or the installation tube if any, as air currents can affect sensor read-

ings.

●Adhere to allowed ambient conditions.

A mounting plate is provided for fitting onto a square conduit box with 60.3 mm fixing cen-

ters. A conduit box of at least 50 mm in depth is recommended to accommodate all wire

connections.

After installing the mounting plate, wire all unit terminals. Secure the unit to the mounting

plate as described in the installation and operating instructions (Document ID:

A6V12101240) enclosed with the unit.

Mounting

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WARNING

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 [6]).

External circulation (factory setting)

The unit is set with the factory setting of external circulation ( ) only and 3-speed manual

fan (P53 = 3), i.e. P02 = 1, P24 = 0, P25 = 0 and P26 = 1 (See Control parameters [6]).

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 and with 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 ( , , ) via setting

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 via On/Off button .

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.

Wiring

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Advanced functions

RDF270 fresh air unit controller provides different functionalities for equipment from basic

level with manual 3-speed fan to advanced level with ECM fan, internal / external circulation

and bypass function.

Internal / External air circulation

Some fresh air units have only single duct so they can be set to bring fresh air from outside

or circulate air via a built-in filter to maintain a good air quality.

There are also dual duct fresh air units to enable both internal and external air circulations.

Bypass function

This function is available in a dual duct fresh air unit and for external circulation only.

Without bypass function, the outside air is preheated or precooled by the exhaust air via a

built-in heat exchanging unit in the fresh air unit. Therefore, the outside air temperature can

be maintained in a similar level before entering the indoor area. The time required to heat up

or cool down the outside air by a heating or cooling equipment is much less since the tem-

perature deviation is small. As a result, it saves energy.

There are also other situations that require the bypass function.

For example, if the indoor area is too hot or cold while the outside temperature is cooler or

warmer, simply letting the outside temperature in to maintain a comfort level via the bypass

function (or no heat exchanging with exhaust air) is extremely useful and economical.

FAU-ECO function: (Eco-balance)

FAU-ECO is an automatic function to switch between internal and external air circulation and

therefore, P25 must be enabled or P25 = 1. In addition, to enable this function P02 must also

be set to 2, then select Eco Mode via Power button.

When FAU-ECO is selected, the RDF270 switches the air circulation between external and

internal as per the time ratio defined in parameter P26. For example, the factory setting (P26

= 1:5) means that within one hour, RDF270 stays in external air circulation for 10 minutes,

then switches to internal circulation for 50 minutes. The setting repeats as long as FAU-ECO

mode is active.

This function can help the users to maintain a balanced eco-system by controlling the

amount of fresh air inside the buildings or apartments to achieve good air quality for the liv-

ing space.

For related applications, see Application examples [15].

Error handling

TOUCH IC error

“Er4” is displayed upon internal TOUCH IC error.

Control parameters

Parameter settings

To optimize control performance, use the local HMI to enter parameter mode and adjust a

number of control parameters. All control parameter settings are retained after power down.

Proceed as follows to change the control parameters:

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Press and hold the + and - buttons simultaneously for more than 3 seconds.

Service level: Release the buttons, and within 2 seconds, press and hold the + button

until Pxx is displayed.

Expert level: Release the buttons, and within 2 seconds, press and hold the - button

until Pxx is displayed.

Press the + or - (< or >) button to access the desired parameter and the value of the

selected parameter is displayed at the same time.

Press the (✓) button to edit the value of the required parameter.

Press the + or - button to increase / decrease or select the value of the current

parameter during editing.

Press the (✓) button to confirm the new value or press ( ) to cancel the change,

and repeat steps 3 to 5 to change more parameters.

Press the ( ) button to exit parameter setting mode.

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Reload factory setting

●Select parameter P71 and set it to 1.

●The factory settings of the control parameters are reloaded.

–“- - -” is displayed during reload.

Control parameters

Service level

Parameter

Description

Factory setting

Setting range

P02 *

Operation using operating mode

selector

1 = ON –OFF

2 = ON –FAU ECO –OFF

P14

Keylock

0 = Unlock

1 = Setpoint & fan buttons

adjustment only

2 = Full lock

P24 *

Select BYPASS (external circulation

only)

0 = Disable

1 = Enable

P25 *

Select EXT/INT circulation

0 = Disable

1 = Enable

P26

FAU ECO mode

Select time ratio within one hour

1 = 1:5

2 = 2:4

3 = 3:3

4 = 4:2

5 = 5:1

P27

Operating mode after power failure

0 = Previous operating mode

1 = OFF

2 = ON (Normal mode)

P28

Timer with delay Off (0 up to 23 hours,

0.5 h)

0 = Disable

1 = Enable

* The parameters are critical and must be set according to the selected equipment during

commissioning.

Expert level

Parameter

Description

Factory setting

Setting range

P53 *

Maximum VRF fan speed

3 = 3-speed

8 = DC 0...10 V (ECM fan)

P55

ECM fan max. output

80 %

ECM fan min…100 %

P56

ECM fan min. output

30 %

1 %...ECM fan max.

P59

Fan minimum On time (3-speed fan

only)

2 min

1...6 min

P71

Restore factory setting

0 = Disable

1 = Reload start

P98 *

Enable Chinese text display

0 = Disable

1 = Enable

* The parameters are critical and must be set according to the selected equipment during

commissioning.

Note

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Expert level (diagnostics & tests)

Parameter

Description

Range

Dependencies

d06

Software version

Ux.xx is displayed

d07

Fresh air unit DC output check

0 = 0 % output

1...100 = 1 % to 100 % output

P53

d08

Fresh air unit (FAU) relay output

check

Q1 to Q5 are NO relays (normal

open)

0 = All relays open

1 = Close only Q1

2 = Close only Q2

3 = Close only Q3

4 = Close only Q4

5 = Close only Q5

6 = All relays closed

P24, P25, P53

d09

FAU –active BYPASS damper

OPE = Open (normal position)

CLO = Close

P24

d10

FAU –active EXT/INT circulation

damper

OPE = Open (normal position)

CLO = Close

P25

Operation

Display

The display shows the current selected fan speed only (factory setting). If BYPASS and

EXT/INT air circulation functions are enabled, the corresponding symbols are shown to indi-

cate the mode of air flow.

Air flow selection

When P25 = 1, the following can be selected by users.

●: External circulation without BYPASS ( i.e. fresh air via heat recovery unit)

●: External circulation with BYPASS ( i.e. fresh air will bypass heat recovery unit)

When P24 = 1, there is an additional selection available.

●: Internal circulation (i.e. no fresh air from outside)

FAU ECO mode (P02 = 2, P25 = 1)

FAU ECO mode can be enabled via setting P02 = 2 (i.e. FAU ECO can be selected) and

P25 = 1 (i.e. external and internal circulations must be enabled).

When FAU ECO mode is selected, the fresh air fan controller automatically switches be-

tween internal and external circulations for the air flow as per the ratio defined by P26. E.g.,

when P26 = 1:5, the controller switches to external circulation for 10 minutes, then internal

circulation for 50 minutes. The mode setting repeats automatically within one hour. Other ra-

tios can be selected via P26.

For FAU ECO mode, users can select external circulation without bypass (P24 = 0: disable)

and with bypass (P24 = 1: enable).

Fan type and fan speed adjustment

3-speed fan type (P53 = 3) and 1-speed fan are the factory setting. When P53 is set to 8,

ECM fan type is selected.

Only 3 manual fan speeds can be selected (low, medium and high) for 3-speed fan and ECM

fan.

Keylock

Keylock can be activated or deactivated via parameter P14 (see Control parameters [6])

when the controller is in ON and OFF mode.

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Operating modes

The following operating modes are available:

Normal mode

In Normal mode (ON), the controller displays the fan speed and air flow status.

OFF mode

In OFF mode, the controller is turned off.

Timer with delay Off mode

In timer with delay Off mode, the timer starts counting down according to the set hour when

parameter P28 is enabled. When the timer expires, the device automatically turns off.

1. Activation of timer with delay Off mode

When P28=1, press and hold for more than 3 seconds to enter delay Off timer mode.

2. Setting the timer with delay Off mode

–A preset value (1h) is displayed after entering delay Off timer mode.

–Use the + or - button to change the time up to 23 hours with a 0.5 h increment or

decrement respectively.

–Press the (✓) button to confirm the change. The device automatically exits delay

Off timer mode or press the ( ) button to return to previous step.

–Or press the ( ) button to exit delay Off timer mode without saving changes and

to return to Normal mode.

3. Cancellation of timer with delay Off mode

Cancel by setting the timer to 0 hour.

4. Viewing or editing of timer with delay Off mode

–Press and hold down for more than 3 seconds to view the remaining time.

–Use the + or - button to change the time and press the (✓) button to confirm the

new value.

–The timer runs according to the new value.

Operating mode setting upon power down

If the FAU is disconnected from AC 230 V power and reconnected, the unit returns to same

operating mode before powering down if P27=0. If P27=1, the unit is in OFF mode. If P27=2,

the unit resumes Normal mode (ON).

Disposal

The device is considered an electronic device for disposal in accordance

with the European Guidelines and may not be disposed of as domestic

garbage.

●Dispose of the device through channels provided for this purpose.

●Comply with all local and currently applicable laws and regulations.

Cyber security disclaimer

Siemens provides a portfolio of products, solutions, systems and services that includes secu-

rity functions that support the secure operation of plants, systems, machines and networks.

In the field of Building Technologies, this includes building automation and control, fire safe-

ty, security management as well as physical security systems. In order to protect plants, sys-

tems, machines and networks against cyber threats, it is necessary to implement –and con-

tinuously maintain –a holistic, state-of-the-art security concept. Siemens’ portfolio only forms

one element of such a concept.

You are responsible for preventing unauthorized access to your plants, systems, machines

and networks which should only be connected to an enterprise network or the internet if and

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