Lochinvar RSB-i&s-05, CP-5M-4/08 Gas Train And Controls, Water Connections Heating Boilers Only

IMPORTANT

Upon completion of any testing on the gas system, leak test all gas connections with a soap solution while main burners are operating. Immediately repair any leak found in the gas train or related components. Do Not operate an appliance with a leak in the gas train, valves or related piping.

GAS TRAIN AND CONTROLS

FIG. 39 Gas Train 45,000 - 399,999 Btu/hr Models

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. Hot water piping must be supported by suitable hangers or floor stands, NOT by the boiler. Copper pipe systems will be subject to considerable expansion and contraction. Rigid pipe hangers could allow the pipe to slide in the hanger resulting in noise transmitted into the system. Padding is recommended on rigid hangers installed with a copper system. The boiler pressure relief valve must be piped to a suitable floor drain. See the relief valve section in the Installation and Service Manual.

￿CAUTION

A leak in a boiler system will cause the system to intake fresh water constantly, which will cause the tubes to accumulate a lime/scale build up. This will cause a NON-WARRANTABLE FAILURE.

WATER CONNECTIONS

HEATING BOILERS ONLY

Heating Boilers with inputs of 45,000 - 260,000 Btu/hr have 1 1/2" NPT inlet and outlet connections. Heating boilers with inputs of 315,000 - 500,000 Btu/hr have 2" NPT. All water heaters have 2" NPT. Caution: Field installed reducing bushings may decrease flow resulting in boiler noise or flashing to steam.

FIG. 40 Gas Train 500,000 Btu/hr Model

PIPING OF THE BOILER SYSTEM

The drawings in this section show typical heating boiler piping installations. Before beginning the instal- lation, 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

CIRCULATOR PUMP REQUIREMENTS

This is a low mass, high efficiency hot water boiler which must have adequate flow for quiet, efficient operation. The boiler circulating pump must be purchased locally. The boiler circulator pump must operate continuously while the boiler is firing. Pump selection is critical to achieve proper operation. A pump should be selected to achieve proper system design water temperature rise. A heat exchanger pressure drop chart (Table L) is provided to assist in proper pump selection. Also provided is a System Temperature Rise Chart (Table N). This table provides GPM and boiler head-loss at various temperature rises for each boiler based on Btu/hr input. Temperature rise is the difference in boiler inlet temperature and boiler outlet temperature while the boiler is firing. Example: The boiler inlet temperature is 160°F and the boiler outlet temperature is 180°F, this means that there is a 20°F temperature rise across the boiler.

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