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FB Function WE Anl Comments
16 Sensor selection OFF All FB16 = ON; select: P1000: Pt 1000 and Pt 100 sensors*
ntc: NTC and Pt 100 sensors*
FB16 = OFF: PTC and Pt 100 sensors*
* A mixture of both types of sensor is possible
17 Control mode
three-step RK2
ON 4, 5,
6, 7,
8, 9,
11
FB17 = ON: Three-step signal control mode
Function block parameters:
K
P
(proportional gain) / 0.1 to 50 (0,5)
T
N
(reset time) / 1 to 999 s (Anl 5, 6: 60 s; Anl 4: 200 s)
T
Y
(val. transit time) / 15, 30 to 240 s (Anl 5, 6: 30 s; Anl 4: 90 s)
FB17 = OFF: On/off control
Function block parameter:
Hysteresis / 1 to 30 °C (5 °C)
18 Outdoor
temperature –
current input
OFF All FB18 = ON: Current input to measure outdoor temperature
activated
Select: 0: 0 to 20 mA = –20 to 50 °C
4: 4 to 20 mA = –20 to 50 °C
A 50-
Ω
resistor must be connected to terminals 7 (+) and GND
(terminals ½) in parallel to the current signal
FB18 = OFF: Sensor input for measuring outdoor temperature
19 4-point
characteristic
OFF FB19 = ON: Characteristic according to four points
FB19 = OFF: Characteristic according to gradient
20 Return flow sensor
RüF1
ON All FB20 = ON: Return flow sensor activated
Function block parameter:
Limiting factor / 0.1 to 10 (1)
Selection with systems Anl 2, 7 and 9:
SLP (thermometer and heat exchanger icons) switched on de
-
pending on return flow temperature or SLP switched on irrele
-
vant of return flow temperature
Setting only possible after entering key number!
21 Return flow sensor
RüF2
OFF 4, 5,
11
FB21 = ON: Return flow sensor RüF2 activated
Function block parameter:
Limiting factor / 0,1 to 10 (1)
Selection with system Anl 5:
SLP (thermometer and heat exchanger icons) switched on de
-
pending on return flow temperature or SLP switched on irrele
-
vant of return flow temperature
Setting only possible after entering key number!
EB 5476 EN 83
Appendix