Siemens RDF270 User manual

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
1 = ON –OFF
2 = ON –FAU ECO –OFF
P14
Keylock
0
0 = Unlock
1 = Setpoint & fan buttons
adjustment only
2 = Full lock
P24 *
Select BYPASS (external circulation
only)
0
0 = Disable
1 = Enable
P25 *
Select EXT/INT circulation
0
0 = Disable
1 = Enable
P26
FAU ECO mode
Select time ratio within one hour
1
1 = 1:5
2 = 2:4
3 = 3:3
4 = 4:2
5 = 5:1
P27
Operating mode after power failure
0
0 = Previous operating mode
1 = OFF
2 = ON (Normal mode)
P28
Timer with delay Off (0 up to 23 hours,
0.5 h)
1
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 = 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
0 = Disable
1 = Reload start
P98 *
Enable Chinese text display
1
0 = Disable
1 = Enable
* The parameters are critical and must be set according to the selected equipment during
commissioning.
Note
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