1 Service

Circulation pumps

System Pump Delay

The system pump delay parameter sets the length of time the system pump (if connected) will run after a SH demand has been satisfied. This parameter is adjustable by the installer by accessing the System Pump Delay parameter. The time range for this parameter is 1 second to 40 minutes. The default time is 30 seconds.

Boiler Pump Delay

The SH pump delay parameter sets the length of time the boiler pump will run after a SH demand has been satisfied. Setting the delay time to 0 will disable the pump. This parameter is adjustable by the installer by accessing the Boiler Pump Delay parameter. The time range for this parameter is 1 second to 40 minutes. The default time is 30 seconds.

DHW Pump Delay

The DHW pump delay parameter sets the length of time the DHW pump (if connected) will run after a DHW demand has been satisfied. This parameter is adjustable by the installer by accessing the DHW Pump Delay parameter. The time range for this parameter is 10 seconds to 40 minutes. The default time is 1 minute.

Boiler Pump Anti-Seize Delay

If the boiler pump does not run for 24 hours, it will be turned on briefly to prevent it from seizing. The length of time it runs is determined by the Boiler Pump Anti-Seize Delay parameter. The range of this setting is 0 seconds to 50 minutes. The default setting is 20 seconds.

Boiler Pump Minimum Voltage

The speed of the boiler pump can be controlled by the SMART SYSTEM control in order to maintain a minimum ΔT through the heat exchanger. Thus, as the firing rate decreases, the speed of the boiler pump can decrease as well. The SMART SYSTEM control outputs a 0 - 10V signal to the boiler pump to control its speed. The Boiler Pump Minimum Voltage parameter determines the minimum voltage given to the boiler pump, thereby setting its minimum speed. The range of this setting is 2.5V to 10V. The default setting is 3.5V.

System Pump Type

The system pump can be programmed to operate in response to any of the Room Thermostat inputs, or to run continuously until the boiler goes into Outdoor Shutdown. To program the system pump to operate only with a space heating call for heat, set the System Pump Type parameter to CFH. To program the system pump to run continuously until outdoor shutdown starts, set the System Pump Type parameter to WWSD. The default setting is CFH.

Service Manual

DHW Pump Anti-Seize Delay

If the boiler pump does not run for 24 hours, it will be turned on briefly to prevent it from seizing. The length of time it runs is determined by the DHW Pump Anti-Seize Delay parameter. The range of this setting is 0 seconds to 50 minutes. The default setting is 20 seconds.

System Pump Anti-Seize Delay

If the boiler pump does not run for 24 hours, it will be turned on briefly to prevent it from seizing. The length of time it runs is determined by the System Pump Anti-Seize Delay parameter. The range of this setting is 0 seconds to 50 minutes. The default setting is 20 seconds.

BMS

BMS Type

When programmed for BMS control through the 0 - 10V BMS input or through ModBus, the 0 - 10V signal can be interpreted as either a modulation command or a set point. When the BMS Type parameter is set to POWER, the 0 - 10V signal will control the modulation. When set to SETPOINT, the 0 - 10V signal will control the SH set point. The default setting is SETPOINT.

Volts at Minimum

When programmed for BMS control through the 0 - 10V BMS input or through ModBus, the Volts at Minimum parameter should be set to the minimum voltage signal sent to the SMART SYSTEM control. The range of this parameter is 0.0V to the Volts at Maximum value. The default setting is 2.0V.

Volts at Maximum

When programmed for BMS control through the 0 - 10V BMS input or through ModBus, the Volts at Maximum parameter should be set to the maximum voltage signal sent to the SMART SYSTEM control. The range of this parameter is the Volts at Minimum value to 10.0V. The default value is 10.0V.

Rate at Minimum Volts

When programmed for BMS control through the 0 - 10V BMS input or through ModBus and the BMS Type is programmed as POWER, the modulation percentage represented by the Volts at Minimum parameter is set by the Rate at Minimum Volts parameter. The minimum value is 0% and the maximum is the Rate at Maximum Volts setting. The default value is 20%.

Rate at Maximum Volts

When programmed for BMS control through the 0 - 10V BMS input or through ModBus and the BMS Type is programmed as POWER, the modulation percentage represented by the Volts at Maximum parameter is set by the Rate at Maximum Volts parameter. The minimum value is the Rate at Minimum Volts setting and the maximum is 100%. The default value is 100%.

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Lochinvar 81-286 service manual Circulation pumps
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81-286 specifications

Lochinvar 81-286 is a highly efficient and innovative heating solution that represents the latest advancements in boiler technology. This model, part of Lochinvar's prestigious line-up, is designed for commercial applications, delivering superior performance while emphasizing energy efficiency and user-friendly operation.

One of the standout features of the Lochinvar 81-286 is its robust construction. Built with high-quality materials, the unit is engineered for durability and reliability, ensuring long-term operation with minimal maintenance. Its compact design allows for versatility in installation, making it suitable for various building layouts and configurations.

The boiler's primary technology is its advanced condensing capability, which optimizes heat transfer and reduces energy consumption. By efficiently using the heat generated during combustion, the 81-286 can achieve higher thermal efficiencies, often surpassing traditional systems. This results in lower operating costs and reduced greenhouse gas emissions, aligning with the growing demand for sustainable energy solutions in commercial buildings.

Lochinvar incorporates intelligent control systems into the 81-286, featuring user-friendly interfaces that facilitate straightforward programming and monitoring. These control systems enable precise regulation of temperature and pressure, ensuring optimal operation while providing real-time feedback that aids in troubleshooting and maintenance. Users can enjoy the convenience of remote monitoring, enhancing the overall user experience.

Another key characteristic of the Lochinvar 81-286 is its capacity range. The model is available in various sizes, allowing it to meet the specific demands of different facilities, from small businesses to large industrial applications. This flexibility makes it a top choice for contractors and engineers seeking reliable heating solutions that cater to diverse needs.

In addition, the Lochinvar 81-286 boasts exceptional safety features, including built-in safeguards that protect against overheating and pressure surges. These aspects ensure that the unit operates within safe parameters, providing peace of mind for facility managers and operators.

In summary, the Lochinvar 81-286 combines durability, efficiency, and advanced technology, making it an ideal solution for commercial heating needs. With its innovative condensing design, intelligent controls, and safety features, this boiler stands out as a reliable choice for those seeking sustainable and effective heating solutions. Its versatility and performance make it a key player in today’s ever-evolving energy landscape.
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