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20 WILO SE 11/2015
PWM 1 mode - geothermal
In PWM 1 mode – geothermal, the pump speed is controlled depending on the
PWM input signal (Fig. 3c).
Behaviour in the event of a cable break:
If the signal cable is separated from the pump, e.g. due to a cable break, the
pump accelerates to maximum speed.
PWM 2 mode - Solar
In PWM 2 mode – solar, the pump speed is controlled depending on the PWM
input signal (Fig. 3d).
Behaviour in the event of a cable break:
If the signal cable is separated from the pump, e.g. due to a cable break, the
pump stops.
External control via a PWM signal
The actual/setpoint level assessment required for control is referred to a remote
controller. The remote controller sends a PWM signal as an actuating variable to
the Pump.
The PWM signal generator gives a periodic order of pulses to the pump (the duty
cycle), according to DIN IEC 60469-1. The actuating variable is determined by the
ratio between pulse duration and the pulse period. The duty cycle is defined as a
ratio without dimension, with a value of 0 … 1 % or 0 … 100 %. See PWM signal
logic 1 (heating and geothermal) fig. 3c and PWM signal logic 2 (solar) fig. 3d.
7 Installation and electrical connection
DANGER! Danger of death!
Incorrect installation and electrical connection can result in fatal injury.
• Installation and electrical connection may only be carried out by qualified
personnel and in accordance with the applicable regulations!
• Adhere to regulations for accident prevention!
7.1 Installation
• Only install the pump after all welding and soldering work has been completed
and, if necessary, the pipe system has been flushed through.
• Install the pump in a readily accessible place for easy inspection and dismantling.
• When installing in the feed of open systems, the safety supply must branch off
upstream of the pump (DIN EN 12828).
• Install check valves upstream and downstream of the pump to facilitate a possible
pump replacement.
• Perform installation so that any leaking water cannot drip onto the control module,
• To do this, aline the upper gate valve laterally.
• In thermal insulation work, make sure that the pump motor and the module are
not insulated. The condensate-drain openings must remain uncovered.
• Install the pump with the power switched off and the pump motor in a horizontal
position see fig. 4 for installation positions of the pump.
• Direction arrows on the pump housing indicate the direction of the flow.
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