Starting; Direction Of Rotation; Maintenance - Wilo Medana CH1-LC Einbau- Und Betriebsanleitung

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8.2

Starting

9

Maintenance

28
Maintenance
Close the filler screw again once the water has exited via the screw port (air removed)
(pos. 4).
Open the valve on the suction side completely (pos. 1).
Open the valve on the end pressure side (pos. 2).
CAUTION
Risk of damaging the pump
The pump must not be operated at a zero flow rate flow (valve on the end pressure
side closed) for more than 10 minutes.
We recommend maintaining a minimum discharge of 10 % of rated discharge.
WARNING
Risk of injury
Depending on the operating conditions of the pump or the installation (the temper-
ature of the discharged liquid and the volume flow), the pump assembly including
the motor may become extremely hot. There is a real risk of burns when coming into
contact with the pump.
CAUTION

Direction of rotation

An incorrect direction of rotation will cause poor pump performance and may over-
load the motor.
Checking the direction of rotation (only for three-phase current motors)
By starting the pump up briefly, check whether the direction of rotation of the pump
matches the arrow on the pump's rating plate. If the direction of rotation is incorrect,
swap 2 phases in the pump's terminal box.
NOTICE
Single-phase motors are intended to operate in the correct direction of rotation.
Open the valve on the end pressure side and stop the pump.
All maintenance work must be carried out by authorised and qualified personnel!
WARNING
Risk of electric shock
Danger from electrical current must be eliminated. Ensure that the pump's power
supply is switched off and secured against unauthorised reactivation before per-
forming any work on the electric system.
WARNING
Risk of burns
In case of high water temperatures and high system pressures, close the guard
valves upstream and downstream of the pump. First, allow pump to cool down.
WILO SE 02/2021