Lochinvar 500, 90 service manual Piping of the Boiler System, System Temperature Rise Chart

4Hydronic piping

9.Inspect the liquid level in the expansion tank. The system must be full and under normal operating pressure to ensure proper water level in the expansion tank. Ensure that diaphragm type expansion tanks are properly charged and not water logged.

10.Start the boiler according to the Section 6 - “Start-Up Instructions” in this manual. Operate the system, including the pump, boiler and radiation units, for one hour.

11.Recheck the water level in the expansion tank. If it exceeds half the tank volume, open the tank to reduce the water level. Recheck pressure charge on diaphragm type tanks.

12.Shut down the entire system and vent all radiation units and high points in the system.

13.Close the water makeup valve and check the strainer and pressure reducing valve for sediment or debris. Reopen the water makeup valve.

14.Verify system pressure with the boiler pressure gauge before beginning regular operation.

15.Within three days of start-up, recheck and bleed all air vents and the expansion tank using these instructions.

Installation & Service Manual

Piping of the Boiler System

The drawings in this section (see FIG’s 4-4 through 4-6) show typical heating boiler piping installations. Before beginning the installation, consult local codes for specific plumbing requirements. The installation should provide unions and valves at the inlet and outlet of the boiler so it can be isolated for service. The boiler circulating pump, air separator, expansion tank and other components required for proper installation must be purchased locally. An air separation device must be supplied in the installation piping to eliminate trapped air in the system. Locate a system air vent at the highest point in the system. The system must also have a properly sized expansion tank installed. Typically, an air charged diaphragm-type expansion tank is used. The expansion tank must be installed close to the boiler and on the suction side of the system pump to ensure proper operation.

￿ CAUTION	This boiler system should not be operated at
	less than 12 PSIG.

TABLE - 4B

SYSTEM TEMPERATURE RISE CHART

Based on Boiler Output in Btu/hr

Btu/hr		20°F ￿T		30°F ￿T		40°F ￿T
Input	Output	GPM	Ft/hd	GPM	Ft/hd	GPM	Ft/hd
315,000	258,300	26.0	4.1	17.3	2.2	13.0	1.3
360,000	295,200	29.7	5.4	19.8	2.5	14.9	1.5
399,999	327,180	--	--	22.0	3.6	16.5	2.0
500,000	410,000	--	--	27.6	6.6	20.7	3.5

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