The Yamatake Honeywell M39000 is an older, legacy industrial control module, often encountered as a spare part for marine and process automation systems.

It is important to clarify that this device is a specialized electronic component from the late 1980s (specifically observed with dates like November 1989), rather than a complete, modern “boiler control system” platform. In industrial contexts, it typically functions as a signal conditioner, controller, or interface module within a larger automation cabinet.

Key Technical Specifications

• Manufacturer: Yamatake-Honeywell (now known as Azbil Corporation).
• Operating Voltage: 24V DC.
• Input/Output: Generally supports 1-5V signals and 4-20mA loops, commonly used for process variables such as pressure or flow control.
• Legacy Context: Because these modules date back to the 1980s, they are considered “end-of-life” products. They are primarily sourced today from industrial surplus inventory or refurbished marine automation suppliers.

Important Identification Note

When searching for the “M39000,” please be aware of two very different product types:

1. Industrial/Marine Control Module: The Yamatake Honeywell M39000 is an automation/process control component.
2. Hand Rivet Tool: There is a common hardware tool called the “Marson M39000” (often sold as the HP-2 Hand Riveter). Ensure you are not confusing the electronic control module with this hand tool when browsing listings on sites like eBay or industrial catalogs.

Maintenance and Replacement Guidance

• Documentation: Because this unit is several decades old, original datasheets may be difficult to find. If you are attempting to replace or troubleshoot an existing unit, you should prioritize capturing the full “Prod No” (Product Number) printed on the label (e.g., R6306431010.12), as the base “M39000” model number may refer to a family of devices rather than a single specific configuration.
• Modern Alternatives: If you are planning a system upgrade, modern boiler control and burner management systems (such as the Honeywell SLATE platform) offer integrated diagnostics, touch interfaces, and network connectivity (Modbus/BACnet) that far exceed the capabilities of 1980s-era analog modules.
• Sourcing: If you require a direct, like-for-like replacement for a legacy system, look for specialized industrial surplus providers who verify “runner take-out” (tested/functional) parts, as purchasing “new” stock for this model is generally no longer possible.