Manuals / Lochinvar / Household Appliance / Boiler

Lochinvar 800 System supply sensor, Boiler management system, Runtime contacts, Alarm contacts

Models: 800

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Installation & Operation Manual

8Field wiring (continued)

System supply sensor

1.By installing the system supply sensor into the supply of the primary loop, the temperature of the system supply can be controlled. The SMART SYSTEM control automatically detects the presence of this sensor, and controls the boiler firing rate to maintain the system supply temperature to the set point (if the outlet sensor control is currently selected). See the Knight XL Service Manual for instructions on how to use the inlet sensor as the controlling sensor. When the inlet sensor is programmed as the controlling sensor, it is vital that the SYSTEM SUPPLY sensor be installed. DO NOT INSTALL THE SYSTEM SUPPLY SENSOR INTO THE SYSTEM RETURN.

2.Connect these terminals to the system supply sensor (FIG. 8-3).

Boiler management system

1.An external control may be connected to control either the firing rate or the set point of the boiler. Connect the Room Thermostat / Zone Control terminals to the enable output of the external control and connect the 0 - 10 VDC terminals to the 0 - 10 VDC output of the external control.

2.Make sure the ground terminal is connected to the ground output terminal of the external control, and the 0 - 10 VDC terminal is connected to the 0 - 10 VDC terminal of the external control.

Runtime contacts

The SMART SYSTEM control closes a set of dry contacts whenever the burner is running. This is typically used by Building Management Systems to verify that the boiler is responding to a call for heat.

Alarm contacts

The SMART SYSTEM control closes another set of contacts whenever the boiler is locked out or the power is turned off. This can be used to turn on an alarm, or signal a Building Management System that the boiler is down. Note that these contacts will close momentarily at the end of each call for heat or at least every 24 hours.

Wiring of the cascade

When wiring the boilers for Cascade operation, select one boiler as the Leader boiler. The remaining boilers will be designated as Members. See page 55 “Configuration of the Cascade” for a detailed explanation of this procedure.

Connect the system supply sensor and outdoor air sensor (if used) to the Leader boiler. For the Cascade system to work properly the system supply sensor must be installed. The location of the system supply sensor should be downstream of the boiler connections in the main system loop (FIG.’s 6-7 and 6-8). The system supply sensor should be wired to the Low Voltage Connection Board at the terminals marked for the system supply sensor (see FIG. 8-3). The Leader control will use the water temperature at the system supply sensor to control the operation of the Cascade.

If outdoor air reset is desired, the outdoor air sensor should be wired to the Low Voltage Connection Board at the terminals marked for the outdoor air sensor (FIG. 8-3). If the outdoor air sensor is connected, the Leader control will calculate the water temperature set point based on the programmed reset curve parameters. If the outdoor air sensor is not connected, the Leader control will maintain the fixed water temperature set point that is programmed into the control.

If a Thermostat or Zone Control enable output is available, it should be wired to the Low Voltage Connection Board on the Leader boiler at the terminals marked for the Room Thermostat/Zone Control (FIG. 8-3). If the boilers are to run continuously, connect a jumper wire between the R and W terminals for the Thermostat/Zone Control input. This will initiate a call for heat on the Cascade.

Communication between the Leader boiler and the Member boilers is accomplished by using shielded, 2-wire twisted pair communication cable. Connect one of the twisted pair wires to terminal A on each of the Low Voltage Connection boards, and the other wire of the twisted pair to terminal B on each of the Low Voltage Connection Boards. Connect the shield wires to one of the shield ground terminals on the Low Voltage Connection Boards (FIG. 8-3). If more than two boilers are on the Cascade, daisy chain the wiring from the Sequencing terminals on the second boiler to the Sequencing terminals on the third boiler, then from the third to the forth, and so on. The connections between boilers can be made in any order, regardless of the addresses of the boilers. Try to keep each cable as short as possible.

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Lochinvar 800 System supply sensor, Boiler management system, Runtime contacts, Alarm contacts, Wiring of the cascade
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800 specifications

Lochinvar 800 is a groundbreaking boiler system designed to meet the heating needs of modern residential and commercial buildings. Renowned for its reliability and advanced technology, the Lochinvar 800 promises efficiency and performance that set it apart from conventional heating systems.

One of the standout features of the Lochinvar 800 is its high-efficiency heat exchanger, which enables significantly lower energy consumption compared to traditional units. This efficiency translates to substantial energy savings, making it not only an environmentally friendly choice but also a cost-effective one. The system boasts an impressive thermal efficiency rating, often exceeding 95%, which ensures that a large portion of the energy consumed is converted into usable heat.

Incorporating cutting-edge control technologies, the Lochinvar 800 utilizes smart controls that enable precise temperature regulation. These controls provide users with the ability to program and adjust settings according to specific heating needs, enhancing comfort while minimizing energy waste. The integration of modulating gas burners further optimizes energy usage, continuously adjusting the output based on the current demand, thereby preventing energy loss.

Another key characteristic of the Lochinvar 800 is its compact and sleek design, allowing for easy installation in various spaces, from utility rooms to commercial settings. The boiler's lightweight construction means that it can be mounted in tight areas, providing flexibility that adapts to the needs of the installation site.

Safety features are a top priority for the Lochinvar 800, equipped with advanced diagnostics and monitoring systems that ensure trouble-free operation. These systems continually assess performance and identify potential issues before they can evolve into serious problems, promoting longevity and reliability.

The Lochinvar 800 is also compatible with various heating distribution systems, including radiant floor heating and traditional radiators, making it a versatile choice for a wide range of applications. Coupled with its low emissions profile, the Lochinvar 800 stands out as a sustainable option in today’s market.

In summary, the Lochinvar 800 represents a new era in boiler design, merging efficiency, innovative technology, and adaptability to meet the challenges of contemporary heating needs. Its advanced features ensure optimal performance while maintaining a commitment to environmental responsibility, making it an ideal solution for energy-conscious consumers.