Hydronic Heating Boilers and Domestic Water Heaters
DOMESTIC WATER
HEATERS Continued
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 maximum allowable straight pipe in heater to tank circulating loop.
Minimum Pump Performance
This is based on heating potable water with a hardness of 5 to 25 grains per gallon and/or total dissolved solids not exceeding 350 ppm. See Water Chemistry, page 37.
LE-Q
TABLE - S
Minimum Pump Performance
BTU/hr Input | GPM | Ft.Hd. | |
495,000 | - 745,000 | 60 | 10 |
985,000 | - 2,065,000 | 90 | 15 |
|
|
|
|
Minimum Pump Performance
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 hot water. Straight copper tubes finned on the outside for maximum heat transfer and coated cast iron one piece cored headers make up an entirely rust proof unit. 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 unit.
Potable Hot Water Temperature Control Settings
Domestic Water Temperatures
WARNING: You must take adequate care to prevent scald injury when storing water at elevated temperatures for domestic use.
This unit has an adjustable temperature control to maintain the desired water temperature set point. See Setting Temperature Control, page 29, for instructions to program the temperature control. The temperature control is factory preset at approximately 125°F (52°C) or less. Households with small children or invalids may require 120°F (49°C) or lower temperature hot water to reduce risk of scald injury.
Operate this high efficiency hot water heater at a temperature setting high enough to prevent condensing of the products of combustion on the unit's heat exchanger or in the attached venting system. A water temperature setting that is above the dew point of the gas combustion products should prevent condensate formation.
WARNING: To guard against scald injury, you must use a
Storing the water at a higher temperature and thermostatically mixing the water increases the available quantity of mixed hot water, greatly reducing the possibility of condensate forming on the heat exchanger or in the venting system and helps prevent water born bacteria growth.
Some states may require a lower water temperature setting for specific applications. Check local codes or your gas supplier for domestic hot water temperature requirements.
• Water temperature over 125°F (52°C) can cause severe burns instantly or death from scalds.
• Children, disabled and elderly are at highest risk of being scalded.
• See instruction manual before setting temperature at heating appliance.
• Feel water before bathing or showering.
• If this appliance is used to produce water that could scald if too hot, such as domestic hot water use, adjust the outlet control (limit) or use temperature limiting valves to obtain a maximum water temperature of 125°F (52°C).
38
