Siemens RCC50.1 Manual de Usario
Siemens
Termostato
RCC50.1
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CE1N3025en
12.06.2003
Siemens Building Technologies
HVAC Products
3025
Room Temperature
Controller
RCC50.1
for two-pipe fan coil units
Modulating PI control
Output for DC 0…10 V valve actuator
Outputs for three-speed fan
Automatic heating / cooling changeover
Operating modes: normal and energy saving or OFF
Operating mode changeover input for remote control
Function for avoiding damage resulting from moisture
Operating voltage AC 24 V
Use
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 DC 0…10 V valve actuator
• For switching a three-speed fan.
Suited for use in systems with
• automatic heating / cooling changeover
• continuous heating or cooling operation.
2/8
Siemens Building Technologies Room temperature controller CE1N3025en
HVAC Products 12.06.2003
Functions
The controller acquires the room temperature with its integrated sensor and maintains
the setpoint by delivering DC 0…10 V control commands to the valve. The controller
provides PI control. The proportional band in heating mode is 4 K and in cooling mode
2 K. The integration time is 5 minutes.
Heating mode Cooling mode
Y10 [%]
XpH w
0
100
3025D01
T [°C]
Y10 [%]
w
0
100
3025D02
T [°C]
XpK
Note: the diagrams only show the proportional part of the PI controller.
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 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 tem-
perature 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.
CM
HM
T
W
[°C]
3025D03
16 28
M
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.
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 , or
• activating an external operating mode changeover switch, provided plant condi-
tions do not call for energy saving, or
• turning the controller’s power supply off.
Energy saver
Automatic
changeover
Purging function
Fan operation
T Room temperature w Room temperature setpoint
XpH Proportional band heating Y10 Manipulated variable «Actuator»
X
p
K Pro
p
ortional band coolin
g
CM Cooling mode
HM Heating mode
M Operating mode
TW Water temperature
3/8
Siemens Building Technologies Room temperature controller CE1N3025en
HVAC Products 12.06.2003
Operating modes
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. In
operating mode selector position , the controller is switched 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.
To avoid damage due to moisture in very warm or humid climatic zones resulting from
lack of air circulation in energy saving mode, DIP switch no. 1 must be set to OFF.
With this configuration, the fan in energy saving mode operates at the speed manually
selected or, if the operating mode selector is set to OFF , at speed I.
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).
Ordering
When ordering, please give name and type reference. The QAH11.1 temperature
sensor (can be used as a changeover sensor), the changeover mounting kit and the
valves are to be ordered as separate items.
Equipment combinations
Type of unit Type reference Data sheet
Temperature sensor QAH11.1 1840
Changeover mounting kit ARG86.3 1840
Motoric actuator (radiator valve) SSA61... 4893
Motoric actuator (small valve 2,5 mm) SSP61… 4864
Motoric actuator (small valve 5,5 mm) SSB61... 4891
Motoric actuator (valve 5,5 mm) SSC61… 4895
Motoric actuator (valve 5,5 mm) SQS65… 4573
Normal operation
Energy saving mode
Avoiding damage
resulting from mois-
ture
Operating mode
changeover switch
Especificaciones del producto
| Marca: | Siemens |
| Categoría: | Termostato |
| Modelo: | RCC50.1 |
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