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Smart Infrastructure
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021
Room Temperature Controllers
Use
RCC10…
for two-pipe fan coil units
Output for on / off valve actuator
Outputs for three-speed fan
Control depending on the room or return air temperature (RCC10)
Automatic heating / cooling changeover
Operating modes of RCC10: normal, energy saving and frost protection mode or
OFF
Operating modes of RCC10.1: normal and energy saving mode or OFF
Operating mode changeover input for remote control
Function for avoiding damage resulting from moisture (RCC10.1)
Selectable control parameters (RCC10)
Operating voltage AC 230 V
Typical use:
Control of the room temperature in individual rooms that are heated or cooled with
two-pipe fan coil units.
For opening or closing a valve and for switching a three-speed fan.
Suitable for use in systems with
automatic heating / cooling changeover
continuous heating or cooling operation.
CE1N3021en
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Functions
Fan operation
cooling mode
ON
OFF
ture
The controller acquires the room temperature with its integrated sensor or external
room temperature sensor (QAA32) or external return air temperature sensor (QAH11.1)
– if used (optional with the RCC10) – and maintains the setpoint by delivering control
commands to the 2-point-valve.
The switching differential with the
RCC10 is adjustable; it can be 1 or 4 K in heating mode and 0.5 or 2 K in cooling
mode
RCC10.1 is fixed; it is 2 K in heating mode and 1 K in cooling mode
The fan is switched to the selected speed via control output Q1, Q2 or Q3.
When the function “Temperature-dependent fan control” is activated (can be selected
with DIP switch no.1), the fan is switched on / off depending on the temperature, that is,
together with the valve.
It is switched off by
leaving the heating or cooling sequence, provided the function “Temperature-
dependent fan control” is activated, or
manually changing to standby , provided plant conditions do not call for frost
protection mode (only with the RCC10), or
activating an external operating mode changeover switch, provided plant conditions
do not call for energy saving or frost protection mode (only with the RCC10), or
turning the controller’s power supply off.
Heating and
Return air tempera-
The heating or cooling valve receives the OPEN command via control output Y11 when
1. the measured room temperature lies by half the switching differential below the
setpoint (heating mode) or above the setpoint (cooling mode), and
2. the valve has been fully closed for more than one minute.
The heating or cooling valve receives the CLOSE comma nd via control output Y11
when
1. the measured room temperature lies by half the switching differential above the
setpoint (heating mode) or below the setpoint (cooling mode), and
2. the valve has been fully open for more than one minute.
Note: control output Y12 delivers a control command which is inverted to the control
command at output Y11 and can be used for normally open valves
The RCC10 provides control either depending on the measured room temperature or
depending on the fan coil unit’s return air temperature. Changeover is automatic if a
QAH11.1 cable temperature sensor is connected.
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SDH
Y11
SDC
16
28
Automatic
changeover
Purging function
Energy saver
Normal operation
(only with the RCC10)
mode
The water temperature acquired by the changeover sensor (QAH11.1 + ARG86.3) is
used by the controller to switch from heating to cooling mode, or vice versa. When the
water temperature lies above 28 °C, the controller switches to heating mode, below
16 °C it switches to cooling mode. If, immediately after switching on, the water temperature lies between the 2 changeover points, the controller will start in heating mode. The
water temperature is measured at minute-intervals and the operational status updated.
Heating mode Cooling mode Automatic changeover
Operating modes
Y11
W
CM Cooling mode T
HM Heating mode w Room temperature setpoint
M Operating mode Y11 Manipulated variable “Valve”
SDC Switching differential “Cooling” T Room temperature
SDH Switching differential “Heating”
W
Water temperature
W
M
CM
HM
The task of the changeover sensor is to initiate the change from heating to cooling
mode even if the two-port valves are shut down for a longer period of time. To ensure
this function, the valves are opened for one minute at 2-hour intervals during off hours.
(Note: this function is not effective when using thermal actuators)
The room temperature setpoint can be limited in increments of 1 K by making use of
the minimum and maximum limitation facility. Arbitrary setpoint readjustments can thus
be prevented.
The following operating modes are available:
Heating or cooling mode with automatic changeover and with manually selected fan
speed III, II or I. In normal operation, the controller maintains the adjusted setpoint.
Frost protection mode
Energy saving
The frost protection function is activated only when DIP switch no.4 is set to OFF.
Frost protection mode can be activated either
by manually switching to standby .
by activating the external operating mode changeover switch, provided DIP switch
no.2 is set to OFF
If the room temperature falls below 8 °C, the controller will automatically switch to frost
protection mode. In that case, the heating valve opens and the fan operates at the selected speed. If the operating mode selector is in position standby , the fan will operate at speed I. The room temperature is maintained at a setpoint of 8 °C and the setpoint adjusted by the user will be ignored.
If frost protection mode is locked (DIP switch no.4 in position ON), standby is locked
also, which means that the controller will not switch to standby but to OFF:
In energy saving mode, the setpoint of heating is 16 °C and the setpoint of cooling
28 °C, independent of the position of the setpoint knob. This operating mode will be
activated when input D1 for operating mode changeover is active and DIP switch no.2
is set to ON.
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RCC10
With input for
return air temperature sensor
Type of unit
Type reference
Data sheet
Temperature sensor
QAH11.1
1840
Room sensor
QAA32
1747
Changeover mounting kit
ARG86.3
1840
Motoric on/off actuator
SFA21...
4863
Thermal actuator (for radiator valve)
STA21...
4893
Thermal actuator (for small valve 2,5 mm)
STP21...
4878
Avoiding damage
(only with the RCC10.1)
changeover switch
resulting from moisture
To avoid damage due to moisture in very warm or humid climatic zones resulting from
lack of air circulation in energy saving mode, the fan will not be switched off when selecting the function “Temperature-independent fan control” (with DIP switch no.1)
Operating mode
Type summary
Ordering
A changeover switch can be connected to status input D1-GND. When the switch closes its contact (caused by an open window, for instance), the operating mode will
change from normal operation to energy saving mode (provided DIP switch no.2 is set
to ON), or from normal operation to standby (provided DIP switch no.2 is set to OFF). If
the room temperature falls below 8 °C and if DIP switch no.3 is set to OFF, frost protection mode will become active.
The operating action of the switch (N.C. or N.O.) can be selected.
Type reference Features
RCC10.1
*)
Without input for return air temperature sensor,
without frost protection function
*) Type is not orderable any more
When ordering, please give name and type reference.
The QAH11.1 temperature sensor (can be used as a return air temperature or changeover sensor), the changeover sensor mounting kit and the valves are to be ordered as
separate items.
Equipment combinations
Mechanical design
*)
*) The documents can be downloaded from http://siemens.com/bt/download.
The unit consists of two parts:
A plastic housing which accommodates the electronics, the operating elements and
the built-in room temperature sensor
A mounting base
The housing engages in the mounting base and snaps on.
The base carries the screw terminals. The DIP switches are located at the rear of the
housing.
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Description
Type reference
Adapter plate 120 x 120 mm for 4
"
x 4"conduit
boxes
ARG70
Adapter plate 96 x 120 mm for 2
"
x 4"conduit
boxes
ARG70.1
Adapter plate for surface wiring 112x130 mm
ARG70.2
Setting and operating
elements
Legend
6 Set of DIP switches
3021Z01
3 4
2 5 6 1
1. Operating mode selector
(standby , heating or cooling mode with manual selection of fan speed)
2 LEDs for indicating heating mode, cooling mode and fan operation
3 Setting facility for minimum setpoint limitation
(in increments of 1 K)
4 Setting facility for maximum setpoint limitation
(in increments of 1 K)
5 Room temperature setpoint knob
DIP switch no. Meaning Position ON Position OFF
1 Fan control Fan control is temperature-
dependent in all operating
modes
2
Operating mode changeover via external switch
Changeover between normal
operation and energy saving
Fan control in normal operation (and in
energy saving mode with the RCC10.1) is
temperature independent
Changeover between normal operation
and standby
mode
2)
3
2)
4
Operating action of switch
for external operating
mode changeover
Changeover activated when
contact of switch is closed
1)
(N.O.)
Standby Frost protection function not
Changeover activated when contact of
switch is open
(N.C.)
Frost protection function enabled
enabled
2)
5
1) Factory setting
2) Only with the RCC10
Switching differential 1 K in heating mode
0.5 K in cooling mode
1)
1)
4 K in heating mode
2 K in cooling mode
The RCC10.1 comes with the following fixed settings:
Switching differential in heating mode: 2 K
Switching differential in cooling mode: 1 K
Standby: OFF, no frost protection
Operating action of switch for external
operating mode changeover: N.O.
1)
1)
1)
Accessories
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Engineering notes
notes
In systems with automatic changeover, the temperature sensor can be replaced by an
external switch for manual changeover.
In systems with continuous heating operation, no sensor will be connected to the controller’s input.
With continuous cooling operation, the controller input (B2–M) must be bridged.
Mounting, installation
and commissioning
Mounting location: on a wall or inside the fan coil unit. Not in niches or bookshelves, not
behind curtains, above or near heat sources and not exposed to direct solar radiation.
Mounting height is about 1.5 m above the floor. The connecting wires can be run to the
controller from a recessed conduit box.
Check the settings of the DIP switches no.1 through no.5 (with the RCC10) and of no.1
and no.2 (with the RCC10.1) and change them, if required. If setpoint limitation is required, use the minimum and maximum limitation facility (energy saver). After applying
power, the controller makes a reset during which the fan LED flashes, indicating that
the reset has been correctly made. This takes about 3 seconds. Then, the controller will
be ready to operate.
Prior to fitting the changeover sensor, thermal conductive paste must be applied to
the location on the pipe where the sensor is placed
The cables used must satisfy the insulation requirements with regard to mains poten-
tial
Sensor inputs B1–M and B2–M carry mains potential. If the sensor’s cables must be
extended, the cables used must be suited for mains voltage
Warning!
No internal line protection for supply lines to external consumers
(Q1, Q2, Q3, Y11, Y12)
Risk of fire and injury due to short-circuits!
Adapt the line diameters as per local regulations to the rated value of the installed
overcurrent protection device.
The controller is supplied with Mounting Instructions.
Disposal
The device is considered an electronic device for disposal in accordance with European Directive and may not be disposed of as domestic waste.
Use only designated channels for disposing the devices.
Comply with all local and currently applicable laws and regulations.
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Technical data
RCM Conformity
CE1T3020en_C1
Power supply
Operational data
tions
Norms and standards
Environmental condi-
Operating voltage AC 230 V +10/-15 %
Frequency 50/60 Hz
Power consumption
RCC10
RCC10.1
max. 8 VA
max. 6 VA
No internal fuse
External preliminary protection with max. C 10 A circuit breaker in the supply line required under all circumstances
Control outputs Q1, Q2, Q3
Rating
Control output Y11 (N.O. contact)
Rating
Control output Y12 (N.C. contact)
Rating
AC 230 V
max. 600 VA
AC 230 V
max. 300 VA
AC 230 V
max. 300 VA
Signal input B1 for return air sensor QAH11.1, Safety class II
NTC resistor 3kΩ at 25°C
Signal input B2 for changeover-sensor QAH11.1, Safety class II
NTC resistor 3kΩ at 25°C
Status input D1 and GND
Contact sensing
Insulation against mains
SELV DC 6-15V / 3-6 mA
4 kV, extra insulation
Operating action
With the RCC10
With the RCC10.1
Perm. cable length with copper cable 1.5 mm
selectable (N.O. / N.C.)
(N.O.)
2
for connection to terminals B1, B2 and D1 80 m
Setpoint setting range 8...30 °C
Max. control deviation at 25 °C max. 0.7 K
Switching differential in heating mode SDH
1 K or 4 K
(selectable)
Switching differential in cooling mode SDC
0.5 K or 2 K
(selectable)
Setpoint «Energy saving mode », heating 16 °C
Setpoint « Energy saving mode », cooling 28 °C
Setpoint «Standby » 8 °C
Operation
Climatic conditions
Temperature
Humidity
to IEC 60721-3-3
class 3K5
0...+50 °C
<95 % r.h.
Transport
Climatic conditions
Temperature
Humidity
Mechanical conditions
Storage
Climatic conditions
Temperature
Humidity
EU Conformity (CE) CE1T3020xx
to IEC 60721-3-2
class 2K3
25...+70 °C
<95 % r.h.
class 2M2
to IEC 60721-3-1
class 1K3
25...+70 °C
<95 % r.h.
*)
*)
Safety class II to EN 60 730-1
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white, NCS S 0502
3021G01
SELV
Environmental
compatibility
General
Connection terminals
Pollution class normal
Degree of protection of housing IP 30 to EN 60 529
*) The documents can be downloaded from http://siemens.com/bt/download.
The product environmental declaration CE1E3020*) contains data on environmentally compatible product design and assessments (RoHS compliance, materials composition, packaging, environmental benefit, disposal).
Connection terminals Use solid wires or prepared
stranded wires.
2 x 0.4-1.5 mm2 or 1 x 2.5 mm
Weight 0.25 kg
Colour of housing front
*) The documents can be downloaded from http://siemens.com/bt/download.
-G (RAL9003)
2
Connection diagrams
L B1* M B2 D1GND
N Q1 Q2 Q3 Y11N
Y12
L, N Operating voltage AC 230 V
B1* Status input “Return air temperature sensor”
M Measuring neutral “Return air temperature
sensor”
B2 Status input “Changeover sensor”
D1, GND Status input for potential-free operating mode
changeover switch
(operating action can be selected)
Q1 Control output “Fan speed I” AC 230 V
Q2 Control output “Fan speed II'” AC 230 V
Q3 Control output “Fan speed III'” AC 230 V
Y11 Control output '“Valve” AC 230 V
(N.O. contact, for N.C. valves)
Y12 Control output “Valve”' AC 230 V
(N.C. contact, for N.O. valves)
* Only with the RCC10
B1* Return air temperature sensor (QAH11.1)
B2 Changeover sensor
(QAH11.1 temperature sensor + ARG86.3
changeover mounting kit)
M1 Three-speed fan
N1 RCC10 / RCC10.1 room temperature
controller
S1 External operating mode changeover switch
Y1 MVE... / MXE... zone valve
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* Only with the RCC10
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Dimensions
3021M01
Unit/baseplate
114,15
3530
11,8
2828
96,6
4
28 28
4
26
30
90
42,8
4
104
3021M02
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Issued by
Siemens Switzerland Ltd
Technical specifications and availability subject to change without notice.
© Siemens Switzerland Ltd, 2003 - 2021
Smart Infrastructure
Global Headquarters
Theilerstrasse 1a
CH-6300 Zug
Tel. +41 58 724 2424
www.siemens.com/buildingtechnologies
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