Lochinvar 000 Table GG, Pump Operation, Heat Exchanger, Common Manifold, Number of Units Size Min

TABLE - GG

Common Water Manifold Size

For Multiple Water Heater

Hot Water Supply Boiler Installations

Btu/hr Input Temperature Rise

Pipe sizing chart provides minimum pipe size for common manifold piping to ensure adequate flow.

	Common Manifold
Number of Units	Size (Min)
1	3"
_______________________	_______________________
2	4"
_______________________	_______________________
3	4"
_______________________	_______________________
4	5"
_______________________	_______________________
5	6"
_______________________	_______________________
6	6"

PUMP OPERATION

1.The water heater or hot water supply boiler has a properly sized integral circulating pump. This pump is sized to circulate water between the heater and storage tank only.

2.The internal pump is sized to the heater input and water chemistry specifications noted in “Water Chemistry.”

6.The operating temperature sensor for a water heater or hot water supply boiler is installed in inlet piping to the water heater or hot water supply boiler.

The operating sensor must be installed in the tapping provided in the lower 25% of the storage tank to achieve proper operation. As shipped from the factory, the operating sensor is installed in a bulb well mounted in the inlet piping to the water heater. When the pump cycles off in normal operation, this sensor location may not adequately sense a quick drop in temperature from a draw of hot water from the storage tank. Placing the sensor in the tapping provided on the storage tank will improve temperature response and prevent short cycles of operation when a water heater is equipped with the optional intermittent pump feature.

The standard integral pump on this water heater is sized based on installation of a single storage tank and heater in close proximity. If the number of fittings and straight pipe exceeds the specified maximum equivalent number of straight feet for a specified diameter of pipe, non-warrantable operational problems may be experienced.

When installing multiple water heaters and/or multiple storage tanks, the diameter of the inner connecting pipe and all fittings must be increased. An increase in pipe diameter will decrease head loss in the system piping and ensure proper flow. Proper pipe size between the heater and storage tank MUST be maintained to ensure that the standard pump supplied on the water heater will maintain desired flow.

NOTE:

Minimum pipe diameters and maximum length specifications must be per the requirements in this section.

3.The diameter and length of the piping installed between the storage tank(s) and water heater must be properly sized based on the equivalent length specifications.

4.The pump must run continuously when the water heater or hot water supply boiler is firing. This is the standard operating system for a water heater or hot water supply boiler.

An intermittent pump control function with an all bronze pump is installed as standard equipment on all water heater systems. The pump will operate only while there is a “Call for Heat” and for a timed period after the water temperature set point is satisfied to remove any residual heat from the combustion chamber.

5.Lubricate pump to manufacturers recommendations. Pump damage due to inadequate lubrication is non-warrantable.

HEAT EXCHANGER

This is a highly sophisticated heat exchanger system, designed to carry water in such a way that it generates a scouring action which keeps all interior surfaces free from build-up of impurities. The straight-line, four pass design of the tubes sends water into the headers at a properly rated velocity. The configuration of the headers, in turn, creates a high degree of turbulence which is sufficient to keep all contaminants in suspension. This “scouring action” provides greater cost savings for owners. Tubes are always able to transfer heat at peak efficiency. Every surface within this water containing section is of a non-ferrous material, providing clear, clean, rust-free hot water. Straight copper tubes finned on the outside for maximum heat transfer and glass lined, cast iron, one piece, cored headers make up an entirely rust-proof unit. On all models, header inspection plugs in the primary heat exchanger can be removed for field inspection and cleaning of copper tubes. Each of the heat exchangers may be removed from the unit.

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