Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS Pipe Size Requirements, Circulating Pump

Commercial Pool Heaters

OPERATION Continued

Pipe Size Requirements

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

TABLE-R

Pipe Sizing Chart

Number of Units	Common Pipe
500,000 - 750,000 Btu/hr Models	Size (Min.)
1	2"
2	3"
3	3 1/2"
4	4"
5	5"
6	5"
Number of Units	Common Pipe
990,000 - 2,070,000 Btu/hr Models	Size (Min.)
1	2 1/2"
2	4"
3	4"
4	5"
5	6"
6	6"

Circulating Pump

1.This pool heater is factory supplied with a properly sized pump that circulates water between the pool heater and system.

2.The pump is sized to pool heater input and water hardness. See Water Chemistry on page 44.

3. Lubricate the pump to the manufacturer’s

recommendations. Pump damage due to inadequate lubrication is non-warrantable. Use SAE 30 non-detergent oil or lubricant specified by the pump manufacturer.

4.Standard pool heaters are furnished with the following circulating pump mounted in the factory supplied pool loop.

500,000 - 750,000 Btu/hr Models

1/4 HP, 120 VAC, 5.8 Amp

990,000 - 1,440,000 Btu/hr Models

1/2 HP, 120 VAC, 7.4 Amp

1,800,000 - 2,070,000 Btu/hr Models

3/4 HP, 120 VAC, 8.8 Amp

This pump is sized based on installation of a single pool heater in close proximity with the system. If the number of fittings and straight pipe exceeds the quantities shown in this section, a larger pump will be required. As an alternative to changing the pump in these circumstances, the piping can be changed to a sub-loop. Check pump for correct pump rotation.

The standard pump selection is based on the following pipe and fittings from the pool heater to the system:

6	- 90° elbows	2 - ball valves
2	- unions	1 - cold water tee

Not more than 45 feet of straight pipe.

IMPORTANT: For every elbow and tee in excess of those shown above, deduct 5 feet from the maximum allowable straight pipe in the pool heater to the system circulating loop.

TABLE-S

Minimum Pump Performance

Btu/hr Input		GPM	Ft.Hd.
500,000	- 750,000	55	10
990,000	- 1,440,000	90	15
1,800,000 - 2,070,000		115	18

Minimum Pump Performance

Pump performance is based on providing adequate flow and temperature rise to prevent scale accumulation in the heat exchanger. See Water Chemistry on page 44.

Heat Exchanger

This is a highly sophisticated heat exchanger, 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, two 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 water. Straight copper tubes-finned on the outside for maximum heat transfer- coated cast iron one piece cored headers make up an entirely rust-proof pool heater. A Cupro-Nickel heat exchanger is standard on 1,800,000 - 2,070,000 Btu/hr models. On all models, header inspection plugs can be removed for field inspection and cleaning of copper tubes. The entire heat exchanger may be easily removed from the pool heater.

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