Strebel S-WG 100, Installation, Operating And Maintenance Manual, Page: 91 / 125

E09.012.246 Manual S-WG
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11.2.4
S
OFT START OPTION
Start parameters can be modified to achieve better start behaviour, in case of noise or other difficulties. This is
done by reducing the fan ramp-up speed. Two reduced settings are available (I and II).
P4BE Soft start (0=normal, 1=reduced fan ramp-up speed (I), 2= reduced fan speed ramp-up (II))
(display D9).
0 = normal start-up
1 = reduced fan ramp-up speed (I)
2 = reduced fan ramp-up speed (II)
11.2.5
P
UMP MODE
(EC
TECHNOLOGY
)
When using a pump with Electronic Commutation technology and start-stop function, with a separate control
connection, this parameter determines the relay for switching the pump on and off.
P5 BN Pump mode (0=modulating, 1=relay1, 2= relay2, 3= relay3, 4= external relay) (display DA).
Do not use the 230 Vac relay for the main power supply of the pump, but directly connect the pump to
the mains of the boiler.
A modulating pump with PWM control: the power supply is directly connected to the mains, the PWM connection
is connected to CN10, contacts 9 and 18.
Pumps with an on/off control can be switched by one of the relay connections “lock-out”, “burner burning” or
“heat demand”. Choose a connection which is not yet used.
If all these connections are already used, an external 24 V relay can be connected to the PMW output connec-
tion (CN10, 9 + 18). By setting the parameter 4, the PMW signal becomes a start/stop signal: ‘pump ON’ by
PMW 100% (so constantly 24 V). This way, the pump can be controlled via the relay.
0 =
PWM 0-100% modulating pump, connection CN10 , connector 9 and 18
1 = Start-stop through relay 1 , connector 19 and 20 (lock-out)
2 = Start-stop through relay 2 , connector 21 and 22 (burner burning)
3 = Start-stop through relay 3 , connector 23 and 24 (heat demand)
4 = Start-stop through PWM and external relay, connection CN10 , connector 9 and 18
11.2.6
T
ANK SENSOR SENSITIVITY
P2KH Gradient heat demand detection DHW tank temperature (display BG) [0.1°C]
With S3 in use as tank sensor, it is possible to detect a fast cooling down of the tank through a large DHW flow.
The sensitivity of this sensor can be set in parameter P2KH in tenths of degrees.