Near boiler piping components

Installation & Operation Manual

5 Hydronic piping

1.	Boiler piping:
	Boiler system piping should be sized per the pipe
	requirements listed in Tables 5A and 5C.
2.	Boiler circulating pump:
	Field supplied. When using Primary/Secondary piping the
	boiler circulating pump should be sized per Table 5A.
3.	Hot Water Generator circulating pump:
	Field supplied. When installed in a Primary/Secondary
	arrangement, the Crest requires an additional pump for

	NOTICE	A system supply sensor (factory supplied)
	NOTICE	MUST BE installed with Primary/Secondary
		MUST BE installed with Primary/Secondary
		systems for proper boiler operation.

10.Y-Strainer:

Field supplied. A Y-strainer or equivalent multipurpose strainer is recommended at the inlet of the heat exchanger to remove system particles from older hydronic systems and protect newer systems.

the Hot Water Generator Loop. The pump should

be sized per Table 5A. Consult the indirect water

heater operating guide to determine flow characteristics

for the selected product used. The pump’s total flow and

heat requirements are the sum of the boiler and the indirect

water heater.

4. Boiler isolation valves:

Field supplied. Full port valves are required. Failure

to use full port valves could result in a restricted flow

rate through the boiler.

CAUTION

NOTICE

The maximum allowable water flow rate through a single Crest boiler is 350 GPM. Exceeding this flow rate will result in damage to the heat exchanger and/or piping.

Reference Table 5B1 for the minimum recommended flow rate through a single Crest boiler at full fire to maintain a 80°F temperature rise. Reference Table 5B2 for the absolute minimum flow rate through a single Crest boiler.

5.	Check valves:
	Field supplied. Check valves are required for
	installation as shown in FIG.’s 5-2 and 5-3. Failure to
	install check valves could result in a reverse flow
	condition during pump(s) off cycle.
6.	Domestic indirect hot water isolation valves:
	Field supplied. Full port valves are required. Failure to use
	full port valves could result in a restricted flow rate through
	the boiler.
7.	Anti-scald mixing valve:
	Field supplied.	An anti-scald mixing valve is
	recommended when storing domestic hot water above
	115°F (46°C).
8.	Pressure relief valve:
	Factory supplied. The pressure relief valve is sized to
	ASME specifications.
9.	System temperature sensor:
	Lochinvar supplies	a	system	temperature sensor.
	The sensor is to be installed in the heating loop
	downstream from the boiler hot water piping and
	heating loop junction.		The	sensor should be
	located far enough downstream to sense system diluted
	water temperature.

Table 5B1 Minimum Flow Rate with the Boiler at Full Fire

TEMPERATURE RISE APPLICATIONS

MODEL	FLOW RATE (GPM)

FB(N,L)1500	35

FB(N,L)2000	46

FB(N,L)2500	58

FB(N,L)3000	70

FB(N,L)3500	81

[Based on 80°F Temperature Rise]

Table 5B2 Absolute Minimum Flow Rate

ABSOLUTE MINIMUM FLOW RATE

MODEL	FLOW RATE (GPM)

FB(N,L)1500	25

FB(N,L)2000	25

FB(N,L)2500	25

FB(N,L)3000	25

FB(N,L)3500	45

3, 2, 3.5, 2.5 specifications

The Lochinvar 2, 3, 3.5, and 2.5 models are a standout lineup in the realm of commercial and residential water heating solutions. Known for their advanced technology and high efficiency, these units cater to a wide range of applications, ensuring optimal performance and reliability.

One of the key features of the Lochinvar models is their robust construction. Each unit is designed to withstand rigorous operational demands while providing excellent thermal efficiency. They are equipped with stainless steel heat exchangers, which offer superior resistance to corrosion and extend the lifespan of the equipment. This durability is essential for both commercial and residential settings where demand can vary significantly.

The Lochinvar 2, 3, 3.5, and 2.5 models utilize innovative control systems that enhance their operational efficiency and user convenience. The built-in Smart Control technology allows for easy monitoring and adjusting of system parameters, ensuring that users can maintain optimal performance with minimal effort. This feature is especially beneficial in commercial settings where large volumes of hot water are required, as it enables users to effectively manage their energy consumption.

Energy efficiency is another hallmark of the Lochinvar lineup. With high-efficiency ratings, these models help reduce energy costs significantly, making them an environmentally friendly option for heating water. The use of advanced combustion technology ensures that these units can deliver maximum heat output with minimal fuel consumption.

Additionally, the Lochinvar models are designed with safety and reliability in mind. They feature multiple safety controls and diagnostics that alert users to potential issues before they escalate, providing peace of mind. The integration of advanced venting options allows for flexible installation configurations, accommodating various building layouts and space requirements.

In summary, the Lochinvar 2, 3, 3.5, and 2.5 models define modern water heating technology with their combination of durability, efficiency, and advanced features. With their innovative design and user-friendly controls, they meet the demanding needs of both commercial and residential users, making them a top choice in the water heater market. Whether for new installations or replacements, these units deliver reliable performance and value.

Lochinvar 2.5, 3.5 service manual Near boiler piping components

Models: 3 2 3.5 2.5

5 Hydronic piping