Buderus ZM433 Central Module Wiring and Installation Guide

Important Installation Notes

Note! Installation of controls, including all safety-related equipment, must comply with all applicable local and national codes and regulations.

Caution! The yellow/green ground conductor must not be used as a control lead. Verify that power is connected to the appropriate terminals. This control must be hard-wired; never use a power cord.

• The total current per power circuit (L1, L2) must not exceed 10A. Verify maximum current draw after start-up to avoid device damage.
• Caution! Only one MEC2 can be allocated to each control. The MEC2 can be plugged into the control panel or room wall-mounted using the optional wall installation kit, wired to the ZM or FM module.
• When connecting multiple ECOCAN-BUS components, the S1 switches (termination on the NM482) of the two outermost ECOCAN-BUS devices must be closed.
• Shielded wires are not required for standard applications. Terminate the shield only at one end.
• Fuse protection: L2 protects modules in slots A, 1, and 2. L1 protects modules in slots 3 and 4.
• Refer to Service Instructions for additional details.

Wiring Diagram Overview (Page 1)

This section details the wiring connections for the Buderus heating control system, featuring the ZM433 central module, CM431 controller module, and NM482 power module.

Control Modules and Power Supply

The system comprises:

• ZM433 central module
• CM431 controller module
• NM482 power module (located behind the controller module)
• MEC2 or boiler display (optional remote control)

The primary power supply is 120V.

Module Slots and Connections

The ZM433 central module provides slots for additional FM modules:

• Slots 1 & 2 for FM modules
• Slots 3 & 4 for FM modules

Key Connections and Terminals

The diagram illustrates various connections and components:

• Mains Power: L1, L2, N, PE (120V, 60Hz) protected by a circuit breaker (20A).
• ECOCAN-BUS: A communication bus for system components.
• Control Voltage: 120V AC.
• Low Voltage: For sensor connections.
• Feed Circuit (PZB): Connection for the supply pump.
• Heating Zone Pump (PH): Connection for the circulation pump.
• Supply Pump (PZB): Connection for the supply pump.
• Sensors:
  • Outdoor temperature sensor (FA)
  • System supply temperature sensor (FZB)
  • System temperature sensor (FV)
• Control Inputs:
  • Input for automatic control
  • System supply selection function
• Outputs:
  • Heating zone controller
  • Hot water functions (e.g., thermal disinfection, single charge)
• ZM433 Switch States: Indicates switch positions for control modes such as AUT (Automatic) and Closed-loop control.
• Terminals: Specific terminals are labeled for various functions (e.g., U, FA, FZB, WF, FV, BF, k1-k6).
• Wire Gauges: AWG14, AWG18, and AWG12 are specified for different connections.

The diagram shows indicators for 'warmer' and 'colder' settings.

Fuses are indicated for power circuits, typically 10AT.

System Examples (Page 2)

The document provides two system examples illustrating typical configurations for heating systems.

Legend

• FZB: System supply temperature sensor
• PH: Circulation pump heating circuit
• PZB: Supply pump
• THV: Thermostatic radiator valve
• SH: Actuator heating mixer
• ÜV: Overflow valve
• FV: System temperature sensor
• FA: Exterior sensor
• 1 BF: Remote control heating circuit 1

System Example 1: Stand-alone heating system

This example depicts a stand-alone heating system. Key components include:

• Mains power connection.
• Exterior sensor (FA) and System temperature sensor (FV).
• Thermostatic radiator valve (THV) and Overflow valve (ÜV).
• Circulation pump (PH) and Actuator heating mixer (SH).
• System supply temperature sensor (FZB).
• R4323 controller.
• Optional remote control (1 BF).

Wiring connections are illustrated using various AWG gauges.

System Example 2: Heating substation with supply pump and low loss header

This example illustrates a heating substation setup featuring a supply pump and a low loss header. Key components include:

• Mains power connection.
• Exterior sensor (FA) and System temperature sensor (FV).
• Thermostatic radiator valve (THV) and Overflow valve (ÜV).
• Circulation pump (PH) and Actuator heating mixer (SH).
• System supply temperature sensor (FZB).
• Supply pump (PZB).
• R4323 controller.
• Optional remote control (1 BF).

Wiring connections are illustrated using various AWG gauges.