Buderus FM448 Centralized Alarm Output Function Module
Brand: Buderus
Document Type: Wiring Diagram / Technical Specification
Module and System Overview
Module Front View
A schematic representation of the module's front panel is displayed.
Legend
Control voltage: 120V~
Low voltage for sensors
The system includes an "internal BUS inside controller" which the FM448 module connects to.
FM448 Centralized Alarm Module
FM448 Centralized Alarm Unit
This is the core component, featuring terminals labeled:
Terminals: ZW, GFS, UA, U
Terminal Numbering: 1, 2 (for ZW); 1, 2 (for GFS); 2, 3, 4 (for UA/U, specific assignment not fully detailed for UA/U block)
Connections:
Power supply for additional modules (input or output) connects to the FM448 unit.
Input and Output Connections
Centralized Alarm Output (AS)
Connected via cable AWG14.
Specifications: Contact load 120V, maximum 8A.
Input/Output Terminals (via AWG18)
Cables labeled AWG18 connect to the following inputs and outputs:
- Heat meter input (ZW): Type: dry contact.
- Input Fluid level limit sensor (GFS): Type: dry contact.
- Input 0-10V (U)4: Accepts a 0-10V analog signal.
- Output 0-20mA (U): Provides a 0-20mA analog signal.
Power Supply for Additional Modules
A separate terminal block is shown for "Power supply for additional modules (input or output)".
This block has connections for AS, N, L, 1, 2, 4, indicating power distribution capabilities.
