Xylem EPR IM Electric heater-circulator unit EPR (obsolete) - Manual (Page 3)

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Instruction manual Laing Electric heater circulator unit
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Contents
Applications ............................................................................................................... 5
Design of the EPR model .......................................................................................... 5
Technical Data ........................................................................................................... 6
Dimensional Drawing................................................................................................. 7
Performance Curve ................................................................................................... 7
Models Available ........................................................................................................ 8
Mounting .................................................................................................................... 9
Connection to the feed and return line ...................................................................... 9
Electrical Connection ............................................................................................... 10
Power Supply .......................................................................................................... 10
400V N3 Electrical Diagram .................................................................................... 10
30V N1 Electrical Diagram .....................................................................................11
30V N3 Electrical Diagram .....................................................................................11
The integrated control.............................................................................................. 1
Schematics of the integrated control ....................................................................... 1
Design of the Main Printed Circuit Board ................................................................ 13
Main switch .............................................................................................................. 14
Fuses ....................................................................................................................... 14
Constant temperature control .................................................................................. 14
Overheating Protection ............................................................................................ 14
Program selection for the switching sequence of the heating elements ................. 15
Pump shut-off ......................................................................................................... 17
Deactivating heating elements ................................................................................ 17
Remote control of the second and third heating element ........................................ 17
Control input ............................................................................................................ 18
Room temperature guided control ........................................................................... 18
Outside temperature guided control ........................................................................ 0
Safety temperature limiter ....................................................................................... 0
Electronic means to prevent dry running ................................................................. 1
Circulator operation control ..................................................................................... 1
Malfunction detector ................................................................................................ 
Attachment of the sensor for the remote control ..................................................... 3
Indirect domestic hot water heating with the Electric heater-circulator EPR ........... 4
Hydraulic connection of the EPR for domestic hot water heating............................ 5
Electrical connection of the EPR for domestic hot water heating ............................ 6
Control method 1 ..................................................................................................... 6
Control method  ..................................................................................................... 7
Operation of heating elements with a load shedding device ................................... 8
Filling of the system ................................................................................................. 30
Pressure and leak tests ........................................................................................... 30
Starting operation .................................................................................................... 30
Replacement of the circulation pump ...................................................................... 31
Replacement of the safety temperature limiter STBR ............................................. 31
Replacement of the main circuit board EPRH ......................................................... 3
Important Notices .................................................................................................... 3
Important Notice: How to avoid overheating............................................................ 3
Important Notice: In the event of safety temperature limiter failure ......................... 33
Important Notice: For proper connection to a floor heating system ......................... 33
Factory settings ....................................................................................................... 33