Installation and operating instructions Siriux/Siriux-D/Siriux-O
59
English
6.2.2 Differential pressure control modes
•
Δ
p-v
: The electronics change the differential pressure setpoint to be main-
tained by the pump in linear form between ½H
S
and H
S
. The differential pressure
setpoint H falls or increases with the flow rate (Fig. 8), factory setting.
•
Δ
p-c
: The electronics maintain the differential pressure created by the pump
above the permitted flow range constantly at the selected differential pressure
setpoint H
S
up to the maximum pump curve (Fig. 9).
•
Δ
p-T
: The electronics change the differential pressure setpoint to be main-
tained by the pump according to the measured fluid temperature. This control
mode can only be selected with an IR operating and service unit (accessory) or
via LON/CAN/Modbus/BACnet. Two settings are possible (Fig. 10):
• Control with positive increase:
If the temperature of the fluid is increased, the differential pressure setpoint
is increased in linear form between H
Smin
and H
Smax
(setting: H
Smax
> H
Smin
).
• Control with negative increase:
If the temperature of the fluid is increased, the differential pressure setpoint
is reduced in linear form between H
Smin
and H
Smax
(setting: H
Smax
< H
Smin
).
6.2.3 Further operating modes for saving energy
•
Manual control mode:
The speed of the pump is maintained at a constant speed
between n
min
and n
max
(Fig. 11). Manual control mode deactivates differential
pressure control at the module.
• If
"auto" operating mode
is activated, the pump is able to detect minimum
heating output requirements of the system by the prolonged reduction of the
fluid temperature and then switching over to
setback operation.
If heating out-
put requirements are increased, the unit automatically switches over to control
mode. This setting ensures that the pump's power consumption is reduced to a
minimum, which is the ideal setting in most cases.
CAUTION! Risk of damage to property!
Setback operation may only be enabled if hydraulic balancing of the system
was performed. In the event of non-compliance, insufficiently supplied sys-
tem components may freeze up in the event of frost.
• The
"Q-Limit"
operating mode can be combined with the other control modes
(
Δ
p-v,
Δ
p-c,
Δ
p-T, controller), which makes it possible to limit the maximum
volume flow to 25% - 90% of Qmax. When the set value is reached, the pump
is controlled on the pump curve along the limit - never beyond.
Siriux, Siriux-D, Siriux-O
Starting time
25-30, 25-40, 25-60, 32-30, 32-40, 32-60, 40-30
approx. 9 sec.
25-65, 32-65, 32-65F, 40-65, 50-65, 50-110, 65-110, 80-40, 80-90 approx. 7 sec.
40-80, 50-70, 50-80, 65-40, 65-80
approx. 4 sec.
32-90, 32-70, 40-60, 40-110, 50-60, 65-90
approx. 3 sec.
