Lochinvar 151-286 Near boiler piping connections, Circulator sizing, System temperature sensor

Outdoor Knight Boiler Installation & Operation Manual

3 Hydronic piping

12.	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. Typically the sensor will be
	located far enough downstream to sense system diluted
	water temperature.
13.	Indirect water heaters:

Lochinvar offers the Squire which is a series of indirect water heaters. The Squire features a stainless steel vessel with a single wall stainless steel heat exchanger.

It is up to the installer to ensure the CAUTION minimum system flow is not less than the

minimum boiler flow at any time.

The outdoor boiler may be piped to an indirect

water heater to heat domestic hot water with the space heat

transfer medium. As depicted on pages 17 through 23

there are two options when utilizing an indirect water

heater.

A. The space heating piping will branch off to flow the

space heat transfer medium through a single wall

heat exchanger coil inside the indirect water heater.

￿WARNING

The National Standard Plumbing Code and the Uniform Plumbing Code limit the pressure of the heat transfer fluid to less than the minimum working pressure of the potable water system up to 30 psi maximum. Also, the heat transfer fluid must be water or other non-toxic fluid having a toxicity of Class 1, as listed in Clinical Toxicology of Commercial Products, 5th Edition.

B. The indirect water heater is connected to the system
supply piping.	A pump controlled by the

outdoor boiler’s control will regulate the flow of water through the indirect water heater. The indirect water heater’s temperature will be regulated by the outdoor boiler’s control.

The outdoor boiler is pre-configured to control the operation of the DHW pump with Domestic Hot Water Prioritization programming. The DHW programming is designed to control and balance the space heating demand by switching between DHW and space heating.

14.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.

Circulator sizing

The outdoor boiler heat exchanger does have a pressure drop, which must be considered in your system design. Refer to the graph in FIG. 3-3 for pressure drop through the outdoor boiler heat exchanger.

Near boiler piping connections

Figure 3-2ANear Boiler Piping w/Y-Strainer					Figure 3-2BNear Boiler Piping w/Low Loss Header
						SYSTEM SENSOR		M
								E
								T
								S
								Y
					AIR VENT VALVE			S		M
								O
						AIR SEPARATOR		T		E
									T
									S
								Y
								S
								M
					LOW LOSS HEADER			O
								R
			SYSTEM					F
					(TYPICAL)
			FROM
								FILL VALVE
		Y-STRAINER
		(RECOMMENDED)				DRAIN
			DOMESTIC HOT
						(TYPICAL)
			WATER PUMP					EXPANSION TANK
	SYSTEM	BOILER	FROM
	PUMP	PUMP		INDIRECT		DRAIN VALVE		M
				DOMESTIC				O
							R
				HOT WATER			F	INDIRECT
	SYSTEM		O	TANK				DOMESTIC
			T					HOT WATER
					Y-STRAINER
TO
					(RECOMMENDED)
							O
							T
					BOLIER PUMP
		DRAIN
		(TYPICAL)
				IMG00377
			TO FLOOR
			DRAIN					IMG00378
						TO FLOOR
	14					DRAIN