Siemens Building Technologies
CA2N1655E / 11.1998
Landis & Staefa Division
1/4
1
655
PBC
Technical data
Power supply:
Nominal voltage
DC 15 V from PRU/A, NRU.., NRK..,
AC 24 V, 50/60 Hz from other controllers
– Max. tolerance
±
15 %
Power consumption
Max. 0.7 VA
Product data:
Sensor element
T1 (PTC)
Trimmer range
±
2.5 K
Setpoint adjustment range
±
3.0 K, stepless (rotary knob)
Room temperature display
3-digit LCD
Display range (selected by switch)
0 ... 50
°
C / 32 ... 122
°
F
Resolution 0.5
°
C / 1
°
F
Connections:
Screw terminals
2.5 mm
2
Service socket
FCC 4/4 pin
Weight without unit base
(including packaging)
0.15 kg
Dimensions (w x h x d)
80 x 135 x 37 mm
Colour:
Housing
NCS 0003-R20B (white)
Operator elements
NCS 1005-R20B (light grey)
Safety:
Product safety
EN 61010-1
– Contamination level
2 (normal non-conductive contamination)
Electrical safety
SELV
General ambient conditions:
Usage
For indoor use
Operating temperature
0 ... 50
°
C
Storage temperature
– 25 ... 70
°
C
Ambient humidity
Max. 65 %rh annual mean,
non-condensing
Conformity
This product meets the requirements for
-marking
Principle of operation
The room temperature is measured with a built-in T1 temperature sensor
(PTC silicon resistance element, see sheet 1713). If a sill-line sensor is used
(such as the PFB-T1, for example), the room temperature sensor must not be
connected (see "Terminal layout", page 2).
The stepless rotary knob on the room operating unit allows the setpoint
defined in the connected controller to be reset locally by
±
3 K.
The LCD display shows the current room temperature in degrees Celsius
(0…50
°
C) or degrees Fahrenheit (32 …122
°
F). The preferred temperature
scale can be selected with switch S4 inside the unit.
A trimmer potentiometer on the underside of the room operating unit can
be used to recalibrate the measured sensor signal by
±
2.5 K (see ”Commissio-
ning”, page 3).
An FCC- telephone socket on the underside of the unit is provided for con-
nection of the ZS1 service terminal, used in conjunction with the PRONTO
IRC controllers for parameter setting and diagnostics.
PBC
Room operating unit
with temperature display
Room operating unit for individual
room control in HVAC systems.
Used in conjunction with PRONTO
PRFA.., PRONTO IRC PRU/A, PRFB..,
PRVU, SMART SMVU and INTEGRAL
RS NRU.., NRK..
• T1 temperature sensor
• Setpoint adjuster
• Room temperature display
• Socket for ZS1 service terminal
(for PRONTO IRC controllers only)
Ordering information
The base unit and electronic assembly are
supplied separately and must be ordered
as separate items:
PBC
Electronic assembly (without base
unit)
PB2
Base unit with transparent
protective cover
22845 Service cable for ZS1 service
terminal
Ordering example
PBC
(Electronic assembly)
PB2
(Base unit)
22845
(Service cable)
50938
±
2.5 K
trimmer potentiometer
– +
FCC socket for ZS1
service terminal
