Cooling System; Monitoring Devices - Wilo HC 20.1+EMU FA Instrucciones De Instalación Y Funcionamiento

4.1.3

Cooling system

4.1.4 Seal
4.1.5 Material
4.2

Monitoring devices

Installation and operating instructions Wilo Motor HC 20.1 + EMU FA, Rexa SUPRA, Rexa SOLID
Product description
which means they are maintenance-free. The connection cable is longitudinally watertight
and has bare cable ends.
The motor has an active cooling system with separate cooling circuit. The water-glycol mix-
ture P35 is used as coolant. Coolant circulation is performed by an impeller. The impeller is
driven with a magnetic coupling by the motor shaft. The waste heat is transferred directly to
the fluid via the cooling flange. The cooling system is not pressurized when in cold state. A
built-in overpressure valve limits the max. pressure to 3 bar in the event of a fault.
CAUTION! The overpressure valve is only fitted as standard from year of manufacture
2015 onwards. In the case of motors without an overpressure valve extremely high pres-
sure can occur in the cooling system if there is a fault. It is imperative that a conversion
is made! Please contact customer service for the conversion!
Different methods are used for the seal to the fluid and the motor compartment:
▪ Version "G": two separate mechanical seals
▪ Version "K": two mechanical seals in a block seal cartridge made of stainless steel
Leakage from the seal is caught in the sealing chamber or leakage chamber:
▪ The sealing chamber accommodates any possible leakage of the seal on the fluid side.
▪ The leakage chamber accommodates any possible leakage of the seal on the motor side.
The sealing chamber between the mechanical seals is filled with medical white oil. The leak-
age chamber is empty.
The following materials are used in the standard version:
▪ Pump housing: EN-GJL-250 (ASTM A48 Class 35/40B)
▪ Impeller: EN-GJL-250 (ASTM A48 Class 35/40B)
▪ Motor housing: EN-GJL-250 (ASTM A48 Class 35/40B)
▪ Seal:
– Motor side:
• Version "G": Carbon/ceramic
• Version "K": SiC/SiC
– Fluid side: SiC/SiC
– Static: NBR (nitrile)
The precise details of the materials are shown in the respective configuration.
Overview of possible monitoring devices:
Internal monitoring devices
Terminal room/motor compartment
Motor winding
Motor bearings
Sealing chamber
Leakage chamber
Vibration sensor
External monitoring devices
Sealing chamber
Key: − = not available/possible, o = optional, • = as standard
All monitoring devices fitted must be connected at all times!
Monitoring the terminal room and motor compartment
The terminal room and motor compartment monitoring protects the motor terminals and
winding from short-circuits. An electrode in both the terminal room and the motor com-
partment measures the moisture content.
HC 20.1 HC 20.1 ...-E3
• •
• •
o o
− −
• •
− −
o o
en-US
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