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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.
TABLE - S
Minimum Pump Performance
BTU/hr Input
495,000 - 745,000
985,000 - 2,065,000
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.
LE-Q
GPM
Ft.Hd.
60
10
90
15
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 properly-sized thermostatic
mixing valve to supply domestic hot water at
temperatures less than 125°F (52°C).
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.
38
• 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).
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