Lochinvar 1.0- 1.3- 1.5 operation manual Timing Specifications, Parity, Data Transmission Mode

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Modbus Instructions

2Configuration

Timing Specifications

The baud rate for the Modbus board is selectable with Dip switch #9.

1 = 19200 bps

0 = 9600 bps

Each message is started by at least 3.5 character times of silence. The maximum delay between frames is 1.5 character times.

When the system temperature and/or tank temperature is provided by the BAS to the boiler, it is critical that the temperature be updated every few seconds. If the boiler does not receive updated temperatures within a timeout period (installer adjustable), the control will revert to using its own sensor inputs (if sensors are connected). The timeout is programmable by pressing the MAIN>>SETUP>>BMS buttons. The timeout is adjustable between 5 and 120 seconds. The default timeout is 10 seconds.

When the BAS is not providing either of these temperatures, but is still controlling the boiler (such as providing a modulation command), the BAS must refresh these commands at least every 4 minutes. If the commands are not refreshed, the boiler will revert to operating based on its own inputs.

Parity

Parity is set by the position of Dip switch #10. 0 = No Parity

1 = Odd Parity

If No Parity is selected there will be two stop bits, otherwise there will be one.

Data Transmission Mode

Many Modbus bus master devices can be configured to transmit data in either Modbus RTU or Modbus ASCII modes. Since RTU messages can be formatted to use fewer data bits and are therefore more efficient, RTU has been chosen to be used with all Lochinvar Modbus communication. Please ensure that the master device is transmitting Modbus RTU.

Modbus Board Diagnostics

The Modbus board is equipped with three LED’s for visual diagnostics: Two yellow LED’s and one green. One yellow LED (D5) is used to indicate reception of data. The other yellow LED (D6) is used to indicate transmission of data. The green LED (D7) is used to show internal faults.

Internal Faults:

Normal Operation = 1 second on, 1 second off Controller Fault = Continuously on

No Burner Control Communication = 0.5 seconds on, 1.5 seconds off

No Modbus Communication = 1.5 seconds on, 0.5 seconds off

Modbus Communication

The Modbus communication commands and exception codes that are supported by the Modbus communication board can be found on pages 5 and 6 of this manual.

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Contents Modbus Communication Instructions Sync Models 1.0 1.3Contents Configuration AddressingTiming Specifications Data Transmission ModeModbus Board Diagnostics ParityModbus Function Set DecModbus Exception Codes NamePrimary Data Tables Memory MapSync Boiler Memory Map Configuration Bits Holding RegistersWiring Requirements Physical WiringSecondary Secondary Smart Touch Control Module Primary Typical Boiler System Wiring 4Control LocationPhysical Configuration Cascade with individual Monitoring Unit Operation Demand ConfigurationUnit Operation with Modbus Communications Hot Water Generation DHW with direct controlCascade DHW with remote controlMonitoring Only Rate and Temperature Conversions TemperatureRate Deg C Deg F VoltagesTroubleshooting Installation / Replacement Procedure Lockout Codes Input Registers 30016Diagrams LOW Voltage 120 VAC High Voltage2Ladder DiagramPart 3Wiring Diagram

1.0- 1.3- 1.5 specifications

Lochinvar has long been recognized as a leader in the water heating industry, offering high-efficiency solutions for residential and commercial applications. Among its celebrated products are the Lochinvar 1.0, 1.3, and 1.5 models, which represent a range of advanced technologies and features designed to meet diverse customer needs.

The Lochinvar 1.0 is crafted for residential applications, featuring a robust design that emphasizes energy efficiency and reliability. This model incorporates condensing technology, ensuring that water heating is optimized, resulting in reduced energy costs. With a thermal efficiency rating of up to 95%, the Lochinvar 1.0 significantly lowers fuel consumption while providing ample hot water for households. This model also includes a digital control system that offers precise temperature management, enhancing user convenience.

Moving up the scale, the Lochinvar 1.3 model is tailored for slightly larger residential needs and small commercial spaces. This model not only maintains high efficiency with a similar condensing technology but also boasts an expanded capacity. It is equipped with advanced features like an integrated tankless design, which ensures an uninterrupted supply of hot water without the need for a bulky storage tank. Moreover, the Lochinvar 1.3 offers advanced diagnostics, allowing homeowners and technicians to troubleshoot issues quickly and efficiently.

The Lochinvar 1.5 model ramps up the capability even further, catering to larger commercial applications or extensive residential requirements. It offers exceptional performance with an increased output and efficiency, ensuring that even in high-demand scenarios, users are not left wanting for hot water. With an impressive thermal efficiency rating exceeding 96%, this model is engineered to meet stringent energy regulations while providing reliable performance.

All three models feature durable components including stainless steel heat exchangers, enhancing longevity and resistance to corrosion. They also integrate user-friendly interfaces, making them accessible for easy adjustments and monitoring. Additionally, all Lochinvar models are designed with environmental responsibility in mind, contributing to reduced greenhouse gas emissions.

In summary, Lochinvar's 1.0, 1.3, and 1.5 models showcase a commitment to innovation in water heating technology. They offer a blend of efficiency, capacity, and user-friendly features suitable for various applications, making them a wise choice for those in search of reliable hot water solutions.
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