Lochinvar CF-CH(E)-i&s-08, 399 General Plumbing Rules, Water Connections Heating Boilers Only

Hydronic Heating Boilers and Domestic Water Heaters

INSTALLATION Continued

1.Use only Type-T wire [63°F (35°C) rise] on all wiring between the unit and field-installed devices.

2.Enclose line voltage wire exterior to the unit in approved conduit or approved metal-clad cable.

3.The pump must run continuously when unit is being fired (hot water heating boilers must use the optional pump delay if the pump is to be cycled. See Freeze Protection, page 7 when cycling the pump). Water heaters use the pump delay as standard in accordance with ASHRAE 90.1 requirements.

4.To avoid serious damage, do not energize the unit until the system is filled with water.

5.Provide the unit with proper overload protection.

IMPORTANT: Do not block access to the electrical cover plate when installing electrical conduit.

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

Provide suitable hangers or floor stands to support hot water piping. The boiler alone should not support hot water piping. Copper pipe systems are 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. Use padding on rigid hangers installed with a copper system. Pipe the boiler pressure relief valve to a suitable floor drain. See the relief valve section in this 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.

TABLE-N

AMP Draw Data

Btu/Hr			Approximate
Input	Controls	Fans	Total Amps
399,999		2.7	6.3
	3.6
500,000	3.6	2.7	6.3
650,000	5.4	3.4	8.8
750,000	5.4	3.4	8.8
990,000	7.3	3.2	10.5
1,260,000	7.3	3.2	10.5
1,440,000	7.3	6.7	14.0
1,800,000	7.3	6.7	14.0
2,070,000	7.3	6.7	14.0

General Plumbing Rules

1.Check all local codes.

2.For serviceability of boilers, always install unions.

3.Always pipe the pressure relief valve to an open drain.

4.Locate system air vents at the highest point of the system.

5.Expansion tank must be installed near the boiler and on the suction side of the pump.

6.Support all water piping.

Water Connections: Heating Boilers Only

The 399,999 - 750,000 boilers have 2" NPT inlet and outlet connections whereas the 990,000 - 2,070,000 boilers have 2 1/2" NPT inlet and outlet connections. Note: Field-installed reducing bushings may decrease flow resulting in boiler noise or flashing to steam.

BOILER SYSTEM PIPING

The drawings in this section show typical boiler piping installations. Before beginning the installation, consult local codes for specific plumbing requirements. Be sure to provide unions and valves at the boiler inlet and outlet so it can be isolated for service. You must install an air separation device 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 compression tank is used. You must install the expansion tank close to the boiler and on the suction side of the system pump to ensure proper operation.

Circulator Pump Requirements

This is a low mass, high efficiency hot water boiler which must have adequate flow for quiet, efficient operation. Pump selection is critical to achieve proper operation. A pump should be selected to achieve proper system design water temperature rise. A heat exchanger head-loss chart (FIG.’s 34 and 35) is provided to assist in proper pump selection. Also provided is a System Temperature Rise Chart (TABLE–P, page 37). 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.

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