Low Temperature Return Water Systems

Installation and Service Manual

The installer must ensure that the boiler has adequate flow without excessive temperature rise. Low system flow can result in overheating of the boiler water which can cause short burner ON cycles, system noise and in extreme cases, a knocking flash to steam. These conditions indicate the need to increase boiler flow by installation of a larger circulator pump or the installation of a system bypass. System noise may also indicate an oversized boiler.

CAUTION: At no time should the system pressure be less than 12 PSIG.

temperature protection valve (LTV) that is factory preset to maintain 140°F inlet water to the boiler regardless of the system return water temperature. See Table K for available valve kits.

Table - K

LTV Valve Kits

Input

LTV Valve Kit

Btu/hr

495,000 - 745,000VAL3048

985,000 - 2,065,000 VAL3047

Figure 26 - Primary/Secondary Piping of a Single Boiler

Be sure to install the LTV valve per the piping diagrams included with the kits. Alternatively, a bypass as shown in FIG. 28 may be piped into the system. This piping is like a primary/secondary boiler installation with a bypass in the secondary boiler piping. Inlet water temperatures below 140°F (60°C) can excessively cool the products of combustion resulting in condensation on the heat exchanger and in the flue. Condensation can cause operational problems, bad combustion, sooting, flue gas spillage and reduced service life of the vent system and related components. The bypass allows part of the boiler discharge water to be mixed with the cooler boiler return water to increase the boiler inlet temperature above 140°F (60°C). This should prevent the products of combustion from condensing in most installations. The bypass should be fully sized with a balancing valve to allow for proper

PRV

MAKE-UP

WATER

EXPANSION TANK

LWCO (OPTIONAL)

TO SYSTEM

adjustment. A valve must also be provided on the boiler discharge, after the bypass. Closing this discharge valve forces water through the bypass. Start boiler adjustment with the bypass valve in the full open position and the boiler discharge valve half open. A small amount of the higher temperature

SYSTEM PUMP

	12" OR 4 PIPE	AIR SEPARATOR
	DIAMETERS	AIR SEPARATOR
	DIAMETERS

FROM SYSTEM

boiler discharge water is mixed with the system water to maintain the desired lower system temperature. A remote low temperature range operator is recommended to control the boiler operation based on the lower system temperature. (See Terminal Strip Connection Options starting on page 22).

SECONDARY

BOILER PUMP

Figure 27 - Primary/Secondary Piping of Multiple Boilers

Any non-condensing boiler and venting system will develop operational problems when exposed to inlet water temperatures below 140°F. Lochinvar offers a low

Radiant Floor and Snow Melt Heating Systems

This type of heating boiler application operates in a low temperature range which requires a boiler bypass as described under Low Temperature Bypass Requirements. A non-metallic rubber or plastic tubing installed in a radiant (in floor) system must have an oxygen barrier to prevent oxygen from entering the system through the walls of the installed tubing. Excessive oxygen absorption into the system will result in an accelerated rate of corrosion causing a sludge buildup. This excessive corrosion will also damage the boiler and system components.

000 - 2, 065, 495 specifications

Lochinvar 000 - 2,495,065 is a cutting-edge water heating solution designed to meet the needs of modern residential and commercial applications. This high-efficiency unit combines advanced engineering with robust technologies, providing unmatched performance and reliability.

One of the standout features of the Lochinvar 000 - 2,495,065 is its high thermal efficiency, which often exceeds 95%. Utilizing condensing technology, the unit harnesses heat from exhaust gases, allowing it to recover otherwise lost energy, thereby reducing operational costs significantly. This efficiency not only lowers energy bills for users but also lessens the environmental impact by minimizing greenhouse gas emissions.

The Lochinvar 000 - 2,495,065 is equipped with a lightweight stainless steel heat exchanger. This construction ensures exceptional corrosion resistance and longevity, extending the lifespan of the unit while maintaining optimal performance. The stainless steel design also contributes to faster heating times, making it ideal for high-demand environments.

In terms of control technologies, the Lochinvar 000 - 2,495,065 features an intuitive touchscreen interface. This user-friendly design allows for seamless operation, real-time monitoring, and easy adjustments to temperature settings. Additionally, it facilitates remote diagnostics, promoting efficient maintenance and reducing downtime, which is crucial for busy facilities.

For enhanced safety, the Lochinvar 000 - 2,495,065 includes multiple safety mechanisms, such as over-temperature protection, flame safeguard, and leak detection systems. These safety features ensure secure operation and give users peace of mind.

Moreover, the unit is compatible with various fuel sources, including natural gas and propane, making it versatile and adaptable to different infrastructure requirements. This flexibility ensures that the Lochinvar 000 - 2,495,065 can be integrated into various settings, from residential homes to large commercial buildings.

Another significant characteristic is its compact design, allowing for easy installation in tight spaces. The footprint of the Lochinvar 000 - 2,495,065 makes it an ideal solution for applications where space is at a premium, without compromising on performance.

In summary, Lochinvar 000 - 2,495,065 represents a premium choice for water heating solutions, merging advanced technologies, high efficiency, and user-friendly design to cater to a wide range of heating needs while ensuring safety and sustainability.

Lochinvar 065 Low Temperature Return Water Systems, Radiant Floor and Snow Melt Heating Systems

Models: 000 - 2 065 495