Description And Function; Description Of The Pump; Operation Of The Pump - Wilo Yonos PARA High Flow Serie Notice De Montage Et De Mise En Service

6 Description and function

6.1

Description of the pump

The Wilo-Yonos PARA High Flow high-efficiency pumps are glandless pumps with a per-
manent magnet rotor and an integrated differential pressure control. Single pumps
(fig. 1a).
1 Control module
1.1 LED display
1.2 Fault signal LED
1.3 Operating knob
1.4 Connection plug
2 Pump housing
2.1 Direction-of-flow symbol
6.2

Operation of the pump

There is a control module (fig. 1a, item 1) in a vertical design on the motor housing, which
controls the differential pressure of the pump to a setpoint within the control range.
Depending on the control mode, the differential pressure follows different criteria. In all
control modes, however, the pump adapts itself continuously to the changing power
requirements of the unit, which is the case especially when thermostatic valves, zone
valves or mixers are used. In addition to differential pressure control, the pump can be set
to 3 fixed speed stages.
The main advantages of the electronic control are the following:
• Energy savings and while reducing the operating costs at the same time
• Reduction of flow noises
• Reduction of the number of differential pressure valves required.
The following settings can be made:
Nominal delivery head:
The LED display shows the setpoint set on the pump in meters (m). The setpoint can be
adjusted or changed by turning the operating knob.
Control mode:
Variable differential pressure (Δp-v):
The electronics change the differential pressure setpoint to be maintained by the pump
linearly between ½H
with the flow rate.
Constant differential pressure (Δp-c): The electronics keep the differential pressure
created by the pump constant above the permitted flow range at the selected differential
pressure setpoint H
3 speed stages (n = constant): The pump runs uncontrolled in one of three settable fixed
speed stages.
SSM: The contact of the collective fault signal (potential-free normally closed contact)
can be connected to a building automation system. The internal contact is closed if the
pump is without power, if there is no fault or if there is a malfunction of the control mod-
ule. The SSM behaviour is described in sections 10.1 and 10.2.
In the event of a malfunction (depending on the error code, see chapter 10.1), the fault
signal LED is continuously illuminated in red (fig. 1a, item 1.2).
Installation and operating instructions Wilo-Yonos PARA High Flow
and H . The differential pressure setpoint H decreases or increases
S S
up to the maximum pump curve.
S
English
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