Wilo Stratos PARA Série Notice De Montage Et De Mise En Service page 34

English
Type no. Combination of equipment / functions
T24 "Red button" operating element
∆p-c, constant differential pressure
∆p-v, variable differential pressure
Control input PWM 2
Collective fault signal SSM
T26 Without control input PWM 1
The pump runs at the maximum speed
T27 "Red button" operating element
∆p-c, constant differential pressure
∆p-v, variable differential pressure
If the red button is set in the vertical "Ext. In" position, the pump is switched off
T28 "Red button" operating element
∆p-c, constant differential pressure
∆p-v, variable differential pressure
If the red button is set in the vertical "Ext. In" position, the pump runs at the
maximum speed
6.2 Function of the pump
There is a control module (Fig. 1a/b, item 5) in a vertical design on the motor housing,
which controls the differential pressure of the pump to a setpoint within the control range
and allows for an automatic power adjustment of the pump at variable load conditions of
the system.
Depending on the combination of equipment/functions (chapter 6.1 tab. Equipment
variants) up to two kinds of automatic power adjustment are possible.
The basic advantages of the electronic control are:
• Energy savings and hence reduction of the operating costs
• Reduction of flow noises
The high-efficiency pumps of the Wilo-Stratos PARA-Z series are coordinated specifically
for the operating conditions in domestic hot water circulation systems through a selec-
tion of materials and their design.
6.2.1 Pumps with the "Red button" operating element
On the front of the control module (Fig. 1a, item 5) is the "Red button" as a central
operating element (Fig. 1a, item 4), which features three setting ranges.
The following settings can be made:
Constant differential pressure setting range (Dp-c):
Fig. 1a, item 2: The control mode Dp-c is active
Variable differential pressure setting range (Dp-v):
Fig. 1a, item 3: The control mode Dp-v is active
Setting range Ext. In:
Fig. 1a, item 1: External speed or delivery head setpoint setting via analogue input 0...10 V
or pulse-width modulation (PWM) is activated.
34 WILO SE 12/2017