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electrical line noise such as EMI (electro magnetic interference) or
RFI (radio frequency interference) may cause erratic control system
operation and malfunction.
A high quality power supply filter/suppressor must be installed if the
above conditions exist. Call the technical support phone number for
more information.
NOTE
: Malfunctions caused by the power supply and the costs
to install power supply filters are not covered under the limited
warranty.
MIXING VALVES
Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, the elderly and the
physically or mentally disabled are at
highest risk for scald injury.
Feel water before bathing or
showering.
Temperature limiting devices such as
mixing valves must be installed
when required by codes and to
ensure safe temperatures at fixtures.
Water heated to a temperature which will satisfy clothes washing,
dish washing, and other sanitizing needs can scald and cause
permanent injury upon contact. Short repeated heating cycles
caused by small hot water uses can cause temperatures at the point
of use to exceed the water heater’s temperature setting by up to
20°F (11°C).
Some people are more likely to be permanently injured by hot water
than others. These include the elderly, children, the infirm and the
physically/mentally disabled. Table 4 shows the approximate time-
to-burn relationship for normal adult skin. If anyone using hot water
provided by the water heater being installed fits into one of these
groups or if there is a local code or state law requiring a certain water
temperature at the point of use, then special precautions must be taken.
In addition to using the lowest possible temperature setting that
satisfies the demand of the application a Mixing Valve should be
installed at the water heater or at the hot water taps to further
reduce system water temperature. See Figure 8 in Dishwashing
Machines and Figures 52 through 54 in Piping Diagrams beginning
on Page 59.
Mixing valves are available at plumbing supply stores. Consult
a Qualified Installer or Service Agency. Follow mixing valve
manufacturer’s instructions for installation of the valves.
In all cases, the following burn table must be used.
Table 4
Water Temperature
°F (°C)
Time for 1st Degree Burn
(Less Severe Burns)
Time for Permanent
Burns
2nd & 3rd Degree
(Most Severe Burns)
110 (43.3) (normal shower temp.)
116 (46.7) (pain threshold)
116 (46.7) 35 minutes 45 minutes
122 (50) 1 minute 5 minutes
131 (55) 5 seconds 25 seconds
140 (60) 2 seconds 5 seconds
149 (65) 1 second 2 seconds
154 (67.8) instantaneous 1 second
(U.S. Government Memorandum, C.P.S.C., Peter L. Armstrong, Sept. 15, 1978)
CIRCULATION PUMPS
A circulating pump is used when a system requires a circulating loop or
there is a storage tank used in conjunction with the water heater. The tank
is provided with a 1” NPT recirculation loop return connection. See the
Piping Diagrams section beginning on Page 59 for the installation location
of circulating pumps.
See Circulation Pump Wiring Diagrams on page 58 for electrical hookup
information. Install in accordance with the current edition of the National
Electrical Code, NFPA 70 or the Canadian Electrical Code, CSA C22.1.
Stainless Steel circulating pumps are recommended for use with
commercial water heaters.
Refer to the circulating pump manufacturer’s instructions for its operation,
lubrication and maintenance instructions.
DISHWASHING MACHINES
All dishwashing machines meeting the National Sanitation
Foundation requirements are designed to operate with water flow
pressures between 15 and 25 pounds per square inch (103 kPa
and 173 kPa). Flow pressures above 25 pounds per square inch
(173 kPa), or below 15 pounds per square inch (103 kPa), will
result in improperly sanitized dishes. Where pressures are high,
a water pressure reducing or flow regulating control valve should
be used in the 180°F (82°C) line to the dishwashing machine and
should be adjusted to deliver water pressure between these limits.
See Figure 8.
HOT WATER
OUTLET
TO TANK
INLET
CHECK
VALVE
MIXING
VALVE
COLD
WATER
INLET
TEMPERED WATER
OUTLET
12” TO 15”
(30-38 cm)
CHECK
VALVE
Figure 8
The National Sanitation Foundation also recommends circulation of
180°F (82°C) water. The circulation should be just enough to provide
180°F (82°C) water at the point of take-off to dishwashing machine.
Adjust flow by throttling a full port ball valve installed in the circulating
line on the outlet side of the pump. Never throttle flow on the suction
side of a pump.
NOTE: To comply with NSF Standard 5 installation requirements the
bottom of the water heater must be sealed to the floor with a silicone
based sealant or elevated 6 inches above the floor.