Lochinvar 5 operation manual Near boiler piping components

Installation & Operation Manual

5 Hydronic piping (continued)

Figure 5-4Pressure Drop vs. Flow

Pressure Drop vs Flow

		60
Pressure Drop (Feet of Head)	Single Heat Exchanger Only	50
		40
											SB1500
		30									SB1300
											SB1000
		20
		10
		0
		0	10	20	30	40	50	60	70	80	90

Flow Rate (GPM) - Single Heat Exchanger Only

Table 5A Sizing Information for Temperature Rise Applications_20°F, 25°F, 30°F and 35°F

TEMPERATURE RISE APPLICATIONS

Model	MINIMUM PIPE		20°F			25°F			30°F			35°F
	SIZE	GPM		FT/HD	GPM		FT/HD	GPM		FT/HD	GPM		FT/HD
1000	3"	55		31	40		20	38		18	32		13
1300	3"	65*		30	52		20	45		16	37		11
1500	3"	74*		33	60		23	51		18	42		12

NOTICE	Pump sizing and flow requirements are
	based on 20 feet (6 m) of black iron piping, 4
	- 90° elbows, and 2 - fully ported ball valves.
	*When using copper with a 20° temperature
	rise increase piping to 3".
	It is required that near boiler piping systems
NOTICE
	utilize Primary/Secondary configurations as
	shown in FIG.’s 5-5 and 5-6 only. The use of
	other near boiler piping configurations could
	result in improper building and system flow
	rates leading to inadvertent boiler high limit
	shutdowns and poor system performance.

Near boiler piping components

1.Boiler piping:

Boiler system piping MUST be sized per the pipe requirements listed in Table 5A. Reducing the pipe size can restrict the flow rate through the boiler, causing inadvertent high limit shutdowns and poor system performance.

2.Boiler circulating pump:

Field supplied. The boiler circulating pump MUST be sized to meet the specified minimum flow requirements listed in FIG. 5-4.

3.Hot Water Generator circulating pump:

Field supplied. The pump MUST be sized to meet the specified minimum flow requirements listed in FIG. 5-4. Consult the indirect boiler operating guide to determine flow characteristics for the selected product used.

4.Boiler isolation valves:

Field supplied. Full port ball valves are required. Failure to use full port ball valves could result in a restricted flow rate through the boiler.

5.Check valves:

Field supplied. Check valves are required for installation as shown in FIG.’s 5-5 and 5-6. 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 ball valves are required. Failure to use full port ball 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.Unions:

Field supplied. Recommended for unit serviceability.

9.Pressure relief valve:

Factory supplied. The pressure relief valve is sized to ASME specifications.

10.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.

NOTICE	A system supply sensor (factory supplied)
	MUST BE installed for proper boiler
	operation.

11.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.

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