Rehau REH FC-BMS3 User manual

67346 02-15 (HKT)
REH DT3
www.rehau.uk
User Manual
REH FC-BMS3
REH BA3
REH CT3
REH TD3
REH TA3

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© 2015 OJ Electronics A/S
Congratulations with you new control system for underoor
heating and cooling.
The control system has been developed to provide a temperature
control system for room heating and cooling, integrating the switching
of primary heating and cooling sources with the control of water
temperature and mixing devices.
This ensures the best possible comfort conditions and also reduces
energy consumption.
Highlights of the system (depending on the units connected):
:: Heating and cooling control for true comfort
:: Humidity sensor to prevent condensation on oors
:: Energy saving comfort with adaptive function
:: Area control for easy operation
:: Network communication for large applications
:: Easy installation with plug and lead connections
:: Outdoor temperature compensation (optional)
:: Smart access with REH FMSTM
Gateway for REH FS Master (optional)
CONGRATULATIONS

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© 2015 OJ Electronics A/S
QUICK GUIDES
INSTRUCTIONS
CONTENTS
Quick Guide, analogue room sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Quick Guide, REH CT3 programmable room controllers . . . . . . . . . . . . . . . . . . . . . . . . . 4
Quick Guide, REH DT3 room sensor with display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Quick Guide, master modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Master with Display - Type REH FC-BMS3/REH BA3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Supply water temperature control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Using the outdoor compensation module for weather compensation . . . . . . . . . . . . . . . 10
Service menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Using cooling functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Factory settings, masters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Error indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
REHAU Intelligent Room Controller - Type REH CT3 . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Everyday use of the room controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Programming 4-event times and temperatures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Advanced settings and read-outs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Reset to factory settings - room controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Radiator mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
2-step mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Hot water mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Technical specications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
REHAU Intelligent Room Sensor with Display - Type REH DT3. . . . . . . . . . . . . . . . . . . . . 35
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Everyday use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Advanced settings and read-outs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Batteries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
REHAU Intelligent Room Sensors - Type REH Tx3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Setting room temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Setting room sensor operating mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Zone chart 40

4© 2015 OJ Electronics A/S
QUICK GUIDE, ANALOGUE ROOM SENSORS
REH TA3 REH TD3 REH TM3
QUICK GUIDES
Setting time and day
If not already set by the installer, you must adjust the time and day on the REH CT3 room controller as follows (see
picture with button positions):
a. Using a pen or pencil, press the small pinhole button beside the clock symbol.
b. Use the UP and DOWN buttons to adjust the hours and then press OK.
c. Use the UP and DOWN buttons to adjust the minutes and then press OK.
d. Use the UP and DOWN buttons to adjust the day number (1 = Monday) and then press OK.
Setting areas
If not already set by the installer, the REH CT3 room controller can be used to set the operating times and
temperatures of room sensors (channels) in addition to controlling its own room.
To achieve this, do the following on the REH CT3 room controller:
a. Press the UP and DOWN buttons simultaneously for 4 seconds to enter the“InFo” menu.
b. Press the UP and DOWN buttons to locate the “ArEA”menu and then press OK.
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2
These room sensors have an adjustment knob which enables you to increase or decrease the room
temperature setting by up to 4°C.
Room sensors type REH TM3 and REH TD3 have a slide switch for selecting the sensor's mode of operation. 4
dierent modes can be selected: Auto, Day, Night and OFF
Auto: The room sensor will follow the temperature settings of the master or, if the room sensor belongs to
an area controlled by a REH CT3 room controller, will follow the automatic sequence of temperatures and
timings set in the REH CT3.
Day: The room sensor will control room temperature according to the DAY setting dened in the
master (factory setting 21°C).
Night: The room sensor will control room temperature according to the NIGHT setting dened in the
master (factory setting 18°C).
OFF: The room sensor will control room temperature according to the OFF setting dened in the
master (factory setting 5°C). This setting is intended to be a“frost protection” mode and is used if
the room is to be left unoccupied for long periods.
REH TM3 & REH TD3 are recommended for guest rooms and other infrequently used rooms, as they allow
simple override of the automatic timing sequence.
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QUICK GUIDE, WLCT3 PROGRAMMABLE ROOM CONTROLLERS

5© 2015 OJ Electronics A/S
c. The display will show“CH 1”(channel 1).
- Press the OK (√) button.
- Select“ON”if this channel (room sensor) is to be controlled by the REH CT3 room controller, otherwise select“OFF”.
- Now press the OK button to go to the next channel (CH 2) and repeat this step until all the required
channels have been set to“ON”.
d. After all channels have been set, select the“ESC” menu entry and press OK.
NB: If dierent times and temperatures are required for other channels (room sensors) within the system, more
than one REH CT3 room controller can be used. Care must be taken to ensure that a channel is not set to “ON” on
more than one REH CT3 room controller.
Setting program times and temperatures
Adjusting the program times and temperatures.
On Mondays to Fridays (days 1-5), the REH CT3 room controller operates a 4-event program (wake, leave, return,
sleep). On Saturdays and Sundays (days 6-7), it operates a 2-event programs (wake and sleep). Each event can
have a separate temperature and time.
Each event is indicated on the display by the symbols ( ).
To adjust the temperature and time settings:
a. Press the OK (√) button for 5 seconds.
b. The display shows the wake up time for Monday to Friday.
c. Use the UP and DOWN buttons to adjust the hours and then press OK.
d. Use the UP and DOWN buttons to adjust the minutes and then press OK.
e. Use the UP and DOWN buttons to adjust the desired wake up temperature and then press OK.
f. Repeat steps b to e for the leaving time and temperature, the return time and temperature and the
sleep time and temperature.
g. Repeat steps b to e for Saturday and Sunday wake and sleep times and temperatures.
NB: To set up dierent types of event programs, change to Fahrenheit scale, change to AM/PM clock or change
other advanced settings - please refer to the section Instructions REH CT3.
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QUICK GUIDES

6© 2015 OJ Electronics A/S
QUICK GUIDES
QUICK GUIDE, MASTER MODULES
REH BA3 masters are preset and need no adjustment - see“Factory settings”.
With REH FC-BMS3 masters, you can adjust the operating temperatures for any rooms which are not controlled
by a CT room sensor.
Setting day temperature
To adjust the day temperature (indicated by a sun in the display), press the OK button.
Now use the UP and DOWN buttons to select the required temperature and then press the OK button.
Setting remote night temperature
If a remote timer has been tted by the installer, it is possible to switch to a night temperature.
To adjust the night temperature, press the UP or DOWN button until the moon is displayed and then
press the OK button.
Now use the UP and DOWN buttons to select the required temperature and then press the OK button.
Other advanced settings can be changed - see “Master with display type REH FC-BMS3/REH BA3”.
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REHAU BA3
REH FC-BMS3
QUICK GUIDE, WLDT3 ROOM SENSOR WITH DISPLAY
This room sensor shows and controls the room temperature with the possibility of adjusting the standard
setpoint in the system ±4°C.
The room sensor has mode selection between Auto, Comfort, Night and O (frost protection) as well as
connection for a minimum or maximum oor limit temperature sensor.
Auto: The room sensor will follow the temperature settings of the master or, if the room sensor
belongs to an area controlled by a WLCT3 room controller, will follow the automatic sequence of
temperatures and timings set in the WLCT3.
Day: The room sensor will control the room temperature according to the DAY setting dened in the
master (factory setting 21°C).
Night: The room sensor will control the room temperature according to the NIGHT setting dened in
the master (factory setting 18˚C).
OFF: The room sensor will control the room temperature according to the OFF setting dened in
the master (typically 5˚C). This setting is intended to be a “frost protection” mode and is used if the
room is to be left unoccupied for long periods.
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© 2015 OJ Electronics A/S
TROUBLESHOOTING
- If any LED on the master is ashing - see“Error indication”.
Room is too cold
(after running for at least 48 hours)
Room is too hot
(after running for at least 48 hours)
The room sensor is placed in a position that is not representative of the general temperature in the room. For
example mounted on an external wall or near an external heat source.
1. If the room is controlled by a REH CT3 room controller, check that the time and temperatures are set correctly.
2. If the room sensor has an override switch (REH TM3 or REH TD3), the switch may be set to the “OFF”or “NIGHT”
position.
3. For rooms with oor sensors, the maximum oor limit setting could be preventing the room from reaching the
desired temperature.
4. The system may have insucient heating capacity.
5. Poor insulation may be causing large heat loss.
QUICK GUIDES
1. This might be caused by draughts within the wall cavities.
2. The room sensor is placed in a position that is not representative of the general temperature in the room.
3. If the room is controlled by a REH CT3 room sensor, check that the time and temperatures are set correctly.
4. If the room sensor has an override switch (REH TM3 or REH TD3), the switch may be set to the “DAY”position.
5. For rooms with oor sensors, the minimum oor limit setting could be maintaining the room temperature
above the desired setting.
6. Solar gain or an external heat source.
Temperature is unstable This could be caused by periodic solar gain or external heating. Try setting the master to simple ON/OFF control
(DIP-10 set to ON).

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© 2015 OJ Electronics A/S
INSTRUCTIONS
Master with Display - Type REH FC-BMS3/BA3
Introduction
Type REH BA3 masters are preset and
need no adjustment. See“Master factory
settings”.
REH BA3 REH FC-BM3
Using clock thermostat
(REH CT3):
Type REH FC-BMS3 masters are equipped
with graphic display to enable simple
programming and unit operation to
be achieved using simple and easily
understood icons and symbols.
BR1025A02a BR1025A03a
If a room controller is used for area control of one room or a group of rooms, all the room sensors within this zone
will operate according to the temperatures and times dened in the room controller. However, the local room sen-
sors within the group can still be adjusted ±4°C, allowing some rooms to be set higher or lower than others. Which
room sensors form part of the room controller's group is decided by programming the room controller (see REH
CT3 instructions). Any room sensors that are not part of the room controller's group will operate according to the
temperature dened in the master, although local adjustment of ±4°C will still be possible.
NOTE: The REH CT3 is ignored in cooling mode and the master's settings are used.
Using external switch
for night setback
The day temperature setpoint is defaulted to the factory setting of 21°C and the night temperature to the factory
setting of 18°C. These default settings can be changed on the REH FC-BMS3 master.
The current operating setpoint of the master can be forced into night temperature by connecting a separate
timing device to the master. When the external switch or timer is used to switch to night setback, this overrides any
time settings in a REH CT3 room controller, including any room sensors that are part of a group allocated to that
room controller.
NOTE: In cooling mode, the night setpoint is calculated as day temperature +3°C.

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21.0°C
18.0°C
5.0°C
27.0°C
17.0°C
© 2015 OJ Electronics A/S
Day temperature Temperature setpoint for all room sensors which are not part of a room controller group.
Press the OK ( ) button and then the UP (△) or DOWN (▽) button to adjust the setpoint.
Night temperature When activated via an external timer, this temperature applies for all room sensors connected to the master.
Night setback can also be activated on individual room sensors (REH TM3 & REH TD3) by setting the selector switch
to“NIGHT”position. A room controller (REH CT3) will automatically switch to night setback at the programmed
times, as will all other room sensors included in its group.
OFF temperature Room sensors with a selector switch (REH TM3 & REH TD3) can be set to“OFF”position. This position is used for frost
protection. If the temperature in the room drops to the OFF temperature setting (factory setting 5°C), heating will
be activated to prevent frost damage. The 5°C setting can be changed in the master module.
Maximum oor limit temperature for room sensors with limit sensor (oor sensor).
Minimum oor limit temperature for room sensors with limit sensor (oor sensor).
Max.
Min.
By using the UP (△), DOWN (▽) and OK/CONFIRM ( ) buttons, you move through the main menu into
submenus. These submenus are described below. If you want to change a value, press the CONFIRM ( )
button once, then alter the value with the UP (△) and DOWN (▽) buttons.
Then press the CONFIRM ( ) button to accept the new value.
If you wish to reset the master to its factory settings, press the CONFIRM ( ) button for 15 seconds until the
8 output LEDs start ashing. The factory settings have now been restored.
Master with Display - Type REH FC-BMS3/BA3
Navigating the menu

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© 2015 OJ Electronics A/S
Supply water temperature control
Using the supply water sensor
to limit supply water temperature:
Using the outdoor compensation module for weather compensation
When an outdoor compensation module (WLOC3) is connected to the system, the master calculates the correct supply water temperature
taking into account the heat losses that vary with outdoor temperature as well as the room temperature requirements of the system. For
example, on a day when outdoor temperature is 12°C, it is possible to run the heating system with a supply water temperature of only 35˚C.
This ensures economical boiler operation and comfortable room conditions throughout the year. The maximum permissible supply water
temperature prevents excessive water temperatures if outdoor temperature becomes extremely cold, e.g. -30°C.
Master with Display - Type REH FC-BMS3/BA3
A limit sensor must be used with the REH FC-BMS3, but can be used without an outdoor compensation module
(WLOC3. In this case, the master will control the temperature of the supply water owing into the system via a 3- or
4-port mixing valve and actuator.
55.0°C Max. permissible supply water temperature. (This is a safety maximum)
The factory default setting is 55°C, but this can be changed via the display on the master.
-3.0ºC Winter
Outdoor temperature
45.0ºC Winter
Design supply water temperature at outdoor temperature –3°C
Return
20.0°C Summer
Outdoor temperature
25.0ºC Summer
Supply water temperature at outdoor temperature 25ºC
Return

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© 2015 OJ Electronics A/S
Max. supply temperature
The max. permissible supply water temperature is set according to the design requirements of the
installation (line A on the curve). This is the safety maximum.
Weather compensation
Winter
A design outdoor temperature and the corresponding design supply water temperature are set (point
B). To increase heat output, adjust the supply water temperature upwards until you feel comfortable
(we recommend only a 2°C adjustment of this temperature at a time, allowing time for the system to
respond).
Summer
A design outdoor temperature and the corresponding design supply water temperature are set (point
C). Set the outdoor temperature to the level where heating will no longer be required (this is known as
the summer shut-down temperature). The default setting is 20°C. The default setting is 20°C.
Then set the supply water temperature to the level you require when the outside temperature is 20°C.
The default setting is 25°C.
To start summer shut-down at a lower temperature level, reduce the outdoor temperature setting, and/
or reduce the supply water temperature at this setting.
The master calculates the supply water temperature on the line C to 1 if an outdoor design temperature
of -3°C is selected, or on the line C to 2 if an outdoor design temperature of -10°C is selected. The
intersection point on the line of the actual outdoor temperature indicates the calculated supply water
temperature.
Compensation for outdoor temperature is only possible if an outdoor compensation module (WLOC3)
is installed. Without an outdoor compensation module, the master will adjust the supply water
temperature according to the design supply water temperature winter setpoint (default 45°C).
BOOST function with outdoor temperature compensation:
The supply water temperature has a BOOST function that increases or decreases the supply water
temperature depending on the maximum temperature deviation of any active room or active oor.
The purpose of the BOOST function is to ensure that desired room temperatures can be reached faster
than normal.
The BOOST function is an oset temperature added or subtracted from the normal supply temperature
setpoint.
Line 1: Factory settings
Line 2: Example of modied settings
Master with Display - Type REH FC-BMS3/BA3
BR0939A16a

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© 2015 OJ Electronics A/S
Master with Display - Type REH FC-BMS3/BA3
The oset value is calculated as three times the worst temperature deviation in the system.
The maximum permissible BOOST compensation is limited to +/-15°C.
The BOOST function is an additional input to the current outdoor temperature compensation
calculation and gives the following algorithm:
Water supply temperature setpoint = outdoor temperature compensated water supply temp. +
BOOST temp.
This combined setpoint is shown on the master's display as the desired supply water temperature.
If no outdoor sensor is detected (no outdoor temperature compensation), the BOOST function is
disabled.
Example:
Calculated supply water setpoint = 35°C
Maximum temperature deviation of active rooms = 4.2°C
BOOSTED supply water setpoint = 35°C + 3x4.2°C = 47.6°C
The actual supply water setpoint of 47.6°C is also shown on the display.

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© 2015 OJ Electronics A/S
Service menu
Master with Display - Type REH FC-BMS3/BA3
Service menu
Press the OK button to enter the menu.
The controller will automatically return to the main menu after 10 minutes.
5.00 Software version
OK, no faults/errors
E0 to E11 shown if a fault/error is present. See page 15 for explanation.
LS = Low signal on wireless room sensors/controllers
LB = Low battery on wireless room sensors/controllers Submenu 2
Press OK to enter and see which unit is faulty
Submenu 2a
Network status (only visible when multiple masters are connected in a network)
If a network master detects a network, this menu option is shown.
Here, it is possible to check the status of the network.
“TOTAL X” – Shown on the top line. Indicates the total number of masters acting as network
slaves detected by the network master. (X is the number of connected network
slaves.)
“NET STATUS” – Shown on the bottom line. May be:
“NET OK” – No errors detected in the network
“NET ERROR” – Indicates that communication with one or more of the network slaves has been
lost. Use the menu option below to check which network slaves the error concerns.
“ERROR ON IDxx” Indicates whether any of the network slaves have local errors. (IDxx indicates the
network slave concerned. The ID number is the channel set on the network slave's
encoder.) Use the menu option below to check which network slaves the error
concerns.
Press OK to enter the menu option and view which network slave the error concerns and which error it is.
Using the“UP”and“DOWN”buttons to select the network slave whose status is to be shown on the right
side of the display.
>ID11 - ?
ID12 - ?
ID21 - ?
Message
“MESSAGE”  Shown on the right side of the display. May be:
“LOADING STATUS…” – Receiving information from the network.
“STATUS OK” – No error detected.
“NET-COMM ERROR” – Communication to the network slave is lost. Check the connection or remove
the network slave from memory with a hard reset.
NET STATUS
TOTAL X

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© 2015 OJ Electronics A/S
Master with Display - Type REH FC-BMS3/BA3
“E:CHANNEL” – This is a channel error which must be checked locally on the master concerned.
“E1:0-COMM” – Channel 0 or channel 15 are no longer sending data.
“E2:UNITNUM” – Units are set for channels 9-14 but no BA module found.
“E3:APPSENS” – Application sensor defective.
“E4:OUTSENS” – The outdoor compensation module (WLOC3) is defective.
“E5:SUPSENS” – The external supply water sensor (type ETF-1899A) is defective.
“E6:OVERHEAT” – Internal overheating.
“E7:PSUSENS” – Defective internal overheating sensor.
“E8:AO-COMM” – Communication to the BA module has been lost.
“E9:MAXUNIT” – Total number of input units exceeded.
“E10:RFCOMM” – No connection to wireless receiver, type WLRC3
-2.4°C Read-out
Outdoor temperature
⇄49.2ºC
39.2ºC
Read-out
Actual supply water temperature
Actual application sensor temperature
44.4ºC Read-out
Setpoint calculated by the controller for the supply water temperature
3.5V
Read-out
Control signal for the mixing valve.
The mixing valve is fully open at 10V (unless the output setting has been changed to 10-0, in which case
the valve will be fully closed at 10V).
Press the OK button for 3 seconds to change P, I and 0-10V/10-0V settings.
Press and hold the OK button for 3 seconds.
P
20.0°C P-band setting
I
300 I-time setting
10 V Setting for 0-10V or 10-0V DC valve signal
0 V
Back

15 © 2015 OJ Electronics A/S
Master with Display - Type REH FC-BMS3/BA3
---
24.0°C
22.9°C
Read-out
Room temperature in the various rooms. Press the OK ( ) button and then the UP or DOWN button to
select another room. The actual room temperature is shown in the centre of the display. If a maximum
limitation sensor is connected, the temperature measured by the sensor is shown above the actual room
temperature. If a minimum limitation sensor is connected, the temperature measured by the sensor is
shown below the actual room temperature.
In special cases, the behaviour of the temperature regulator can be changed.
Press the OK (√) button for 3 seconds to enter special settings for the channel selected.
- P (P-band) 3..20°C (default = 5°C)
NOTE: Set to 0 for pure ON/OFF control (values of I and B are ignored)
- I (I-time) 60..720 minutes (default = 90)
- B (boost time) 0..12 hours (default = 6 hours) – This function speeds up temperature changes when a
setpoint change is detected by opening or closing the actuators 100% until the room temperature reaches
the new desired temperature.
After that, PI temperature control takes over again.
View and adjust humidity control settings.
This menu is shown when a humidity sensor is connected. Minimum and maximum humidity can only be
controlled if a dehumidier is connected to the corresponding output channel.
Press the OK button to enter the menu.
To view humidity and dew point data, choose the channel number to which the dehumidier
is connected using the UP and Down buttons.
Read-outs for dew point and humidity:
In the %RH menu, the uppermost line will show the current dew point and humidity.
- Channel Zero shows the worst-case situation in the whole system.
- Other channels show the local dew point and humidity.
- Only channels to which a humidity sensor is connected are shown.
Press the OK button for 3 seconds to adjust dehumidier settings.
Adjust the ashing value and press OK to save the setting and move to the next parameter.
Once the last parameter has been saved, the display returns to the main menu.

16 © 2015 OJ Electronics A/S
Master with Display - Type REH FC-BMS3/BA3
Read-out
Output runtimes in years, days, hours and minutes can be viewed.
Total system runtime
Boiler relay runtime
UFH pump relay runtime
X-OUTPUT runtime
Runtime of each channel output relay on master
YY:DDD:HH:MM
Years: Days: Hours: Minutes
Runtime of each channel output relay on add-on module
YY:DDD:HH:MM
Years: Days: Hours: Minutes
Return to the main menu by pressing the OK button briey.
Reset all timers by pressing and holding the OK button for more than 5 seconds.
(A countdown is shown on the display, which automatically returns to the main menu on
reaching zero.)
Minimum permissible supply water temperature during cooling.
(Range 5-20°C / default 16°C)
Safety margin between supply water temperature and dew point during cooling.
(Range 1-10°C / default 3°C)

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© 2015 OJ Electronics A/S
Master with Display - Type REH FC-BMS3/BA3
Cooling channel settings
Mode:
OFF: Channel output (room) not used for cooling.
ON: Channel output (room) used for both cooling and heating.
Dual: Channel output (room) used for heating and the following channel output used for cooling.
Channel Mode Default
Ch 1 OFF / ON /
Dual
ON
Ch 2 OFF / ON /
Dual
ON
….
…..
Ch 14 OFF / ON
only
ON
View cooling channel settings. Press the OK button to enter the menu.
Choose the channel number using the UP and DOWN buttons.
Press the OK button for 3 seconds to adjust the cooling channel setting.
Choose the cooling channel setting using the UP and DOWN buttons. Icon for channel
=heating only.
Icon for channel = heating and cooling on same channel.
Icon for channel = heating with following channel = cooling.
Press the OK button to return to the read-out menu.
Cooling oset (positive temperature oset relative to heating setpoint)
Range 0-10°C / default 3°C
Exit service menu.

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© 2015 OJ Electronics A/S
Advanced service menu on REH FC-BMS3 Masters
To enter Press the UP and DOWN buttons simultaneously for 5 seconds while the “sun” is shown on the display.
Then also press the“OK” button for 1 second.
The display now
shows the following
menu:
Number of units on the 1-wire bus
Number of units on the 1-wire bus with errors
Number of channels used
Total number of errors in the system
Add-on module present?
Add-on module status (OK or ERRORS)
Number of WLRCs found
Number of WLRCs expected
Press the UP button to
access the next menu:
Actual supply water temperature
Current supply water setpoint
Actual outdoor temperature
Actual voltage output to mix. valve
Internal temperature of master
Internal temperature of AO module
Number of WLRCs found
PWM (sequence) timer
Press the UP button to
access the next menu:
U-01 = unit number 1 + type
Special ID number for unit
Setting on channel selector
Actual room temp.
Actual oset on adjust button
Measurement on limit sensor input
Setting on mode slider
Seconds since last communication
Press the Up button
to access the next
menu (this takes you
through all the units on
the 1-wire (or wireless)
bus).
Channel output (regulator)
Channel mode
Setpoint and mode
Measured room temp.
PWM output
PWM period
Actual PWM time
Measured uctuation in room
Master with Display - Type REH FC-BMS3/BA3

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INSTRUCTIONS
© 2015 OJ Electronics A/S
Factory settings, masters
Using cooling functions
Master Settings Factory setting Own setting
BA/FC-BMS
Room temperature 21.0°C
Night temperature 18.0°C
OFF temperature 5.0°C
Floor limit temp., high 27.0°C
Floor Limit temp., low 17.0°C
FC-BMS
Max. water temperature 55.0°C
Weather compensation
Cold (winter)
Outdoor temperature -3.0°C
Water temperature 45.0°C
Weather compensation
Warm (summer)
Outdoor temperature 20.0°C
Water temperature 25.0°C

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© 2015 OJ Electronics A/S
Using cooling functions
Master Settings Factory settings
BA/FC-
BMS
Cooling mode Day cooling temperature Day heating temperature + 3°C
Night cooling temperature Day cooling temperature +3°C
Dew point safety zone Dew point + 3°C
Room temperature control PI-control P = 4°C
I = 90-180 sec
K-factor = 0.1
Floor Limit temperature control P-control P = 4°C
Adaptive PWM control Max. permissible room temperature uctuation +/- 0.5°C
PWM time interval limits 15-45 minutes
Max. number of connected
sensors
Wired and wireless 24
Sensor timeouts Wired 300 sec. (5 min)
Wireless 10000 sec. (2 h 45 min)
FC-BMS Minimum supply water temperature for cooling 16°C
Supply water temperature
control
PI-control P = 20°C
I = 300 sec.
K-factor = 0.05
Additional information