Maintenance And Repair; Repair Of Housing Coating - Wilo Rexa PRO Serie Instrucciones De Instalación Y Funcionamiento

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13.2.5 Commissioning
13.2.6

Maintenance and repair

13.2.6.1 Repair of housing coating

13.2.6.2 Replacing the connection cable
13.2.6.3 Changing the mechanical seal
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Appendix
DANGER
Risk of explosion when using non Ex-rated pumps!
Pumps without Ex rating may not be used in potentially explosive areas! There is a risk of
fatal injury due to explosion! Only use pumps which have the appropriate Ex labelling on
the rating plate within potentially explosive areas.
DANGER
Risk of explosion due to flying sparks in the hydraulics!
During operation, the hydraulics must be flooded (completely filled with the fluid). If the
volume flow is interrupted or the hydraulics emerges, air cushions can form in the hy-
draulics. If this happens, there is a risk of explosion e.g. flying sparks due to static charge!
Dry-running protection must ensure that the pump is deactivated at the appropriate
level.
DANGER
There is a risk of explosion if dry-running protection is connected incor-
rectly!
If the pump is operated within an explosive atmosphere, the dry-running protection
must have a separate signal transmitter (redundant protection of the level control). Pump
deactivation must be performed with a manual reactivation lock!
▪ The operator is responsible for defining the potentially explosive area.
▪ Only pumps with corresponding Ex rating may be used within a potentially explosive area.
▪ Pumps with Ex rating must be labelled on the rating plate.
▪ Do not exceed the maximum fluid temperature!
▪ Dry running of the pump must be prevented! Ensure on-site (dry-running protection) that
emerging of the hydraulics is prevented.
According to DIN EN 50495, a safety device with SIL level 1 and hardware fault tolerance 0
must be provided for category 2.
▪ Carry out maintenance tasks according to the regulations.
▪ Only perform maintenance work which is described in these 'Installation and operating in-
structions'.
▪ The spark-proof gaps may only be repaired according to the manufacturer's design specifi-
cations. It is not permitted to carry out repairs according to the values in tables 1 and 2 of
DIN EN 60079-1.
▪ Only use screw plugs as stipulated by the manufacturer, that at least correspond to a
strength class of 600 N/mm² (38.85 long tons-force/inch²).
The paint layer can become electrostatically charged in case of thicker coats.DANGER! Risk
of explosion! In explosive atmospheres, a discharge can cause an explosion!
If the housing coating has to be repaired, the maximum coat thickness is 2 mm (0.08 in)!
Changing the connection cable is strictly prohibited!
Changing the seal on the fluid and motor side is strictly prohibited!
WILO SE 2019-02