CA2N1655E / 11.1998
Siemens Building Technologies
2/4
Landis & Staefa Division
50949
13
12
11
10
9
8
7
6
5
4
3
2
1
NS
LS
PB
PB
∆
w
SGND
14
1
2
3
4
t
RA
Setpoint adjustment
Signal ground
Room temperature sensor
Service bus (PB-Service)
Service bus (SGND)
Connection to the controller
Use twisted pair cable to connect the PBC room operating unit and the
controller. Screening is not required.
See the relevant controller description for:
• Connection diagrams.
• Cable types and admissible lengths.
Service socket (FCC telephone socket)
for use only with PRONTO IRC
AC 24 V
DC 15 V
Neutral NS
Ground
Phase LS
+15 V
}
supply voltage
}
only with PRONTO IRC
Construction
1 Base unit PB2 (1) with 2 x 7 connection terminals
Not shown: Transparent, recyclable cover (PET) to protect the base unit
after mounting.
2 PBC electronic assembly, comprising:
– Printed circuit board with rotary knob for setpoint adjustment and
LCD display
– Unit cover
Mounting
Mounting instructions (Ref. 35642) are enclosed with the room operating
unit.
The room operating unit may be flush-mounted on a wall box or screwed
directly onto the wall.
If the built-in temperature sensor is used, the following must be noted:
• Mount in the occupied area, approximately 1.5 m above floor level and
at least 0.5 m from any adjacent wall
• Do not expose to direct sunlight
• Do not mount on external walls, in recesses, behind curtains or in the
vicinity of chimneys, doors and lamps.
See sheet 1659 for dimensions and further mounting instructions.
PBC terminal layout
50951
1
2
