Polaris BSS, Инструкция по эксплуатации, Страница: 35 / 63

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In addition to using the lowest possible temperature setting that
satisfies the demand of the application, a mixing valve can be installed
at the water heater (see Figure 8 on Page 18) or at the hot water taps
to further reduce system water temperature.
Never allow small children to use a hot water tap or draw their own
bath water. Never leave a child or disabled person unattended in a
bathtub or shower.
The water heater should be located in an area where the general
public does not have access to set temperatures.
Setting the Operating Set Point at 120°F (49°C) will reduce the risk of
scalds. Some States require settings at specific lower temperatures.
Check with the code authority having jurisdiction..
The water heaters covered in this manual are equipped with an
electronic control system to regulate water temperature inside
the storage tank. The control system senses temperature from
two factory installed temperature probes, one installed in the
top of the storage tank and one installed near the bottom. See
Figures 2 & 3 in Features and Components.
The “Operating Set Point” is adjusted to regulate water
temperature inside the tank. This is an adjustable user setting in
the control system’s “Temperature Menu.” This and all control
system menus are accessed through the UIM (user interface
module) located on the front of the water heater, see Figure 38.
The “Operating Set Point” is adjustable from 90°F (32°C)
to 181°F (83°C). The factory setting is 120°F (49°C). See
Operating Set Point and Differential Adjustment on Page 39 for
instructions on how to adjust the Operating Set Point and other
settings.
Set the Operating Set Point at the lowest setting which produces
acceptable hot water supply. This will always provide the most
efficient operation.
MODULATION
The water heaters covered by this manual are capable
of modulating their firing rate. The CCB monitors water
temperature in the tank and regulates the firing rate to achieve
the target temperature setpoint. The firing rate is dictated by the
hot water draw, proximity to the tank temperature setpoint, and
various other temperature limitations.
HIGH TEMPERATURE APPLICATIONS
Higher operating temperatures cause more wear on all water
heaters and will decrease the life span of the water heater.
Consider installing a small booster water heater for high
temperature applications, such as commercial dishwashers,
to raise the outlet temperature from the larger primary water
heater to the desired point of use temperature. Contact your
local distributor or call technical support phone number listed
on back cover of this manual for further technical assistance.
Tank Temperature 103°F
Operating Set Point 120°F
Status: Heating
MENU HELP
GAS
OFF
O
N
Figure 38
HIGH TEMPERATURE LIMIT CONTROL (ECO)
This water heater is equipped with an ECO (energy cut out) non
adjustable high temperature limit switch. The ECO is a normally
closed switch that opens (activates) on a rise in temperature. The
ECO is located inside the Temperature Probe (two red wires).
The ECO switch contacts will open when the water temperature
reaches approximately 202°F (94°C) and close at approximately
140°F (49°C).
If the ECO activates (contacts open) due to abnormally high
water temperatures in the storage tank, the control system will
immediately de-energize the 24 VAC Gas Control Valve and end
current heating cycle. The control system will lock out disabling
further heating operation. The control system will display the
Energy Cut Out (ECO) Fault message on the LCD screen. It is
important that a Qualified Service Technician be contacted to
determine the reason for ECO activation before resetting the ECO.
Once the reason has been determined and corrected the ECO can
be reset as follows:
Should the ECO activate, water temperature must drop below
140°F (49°C) before the control system can be reset. Once water
temperature has cooled below this point the power supply to water
heater must be turned off and on again to reset the control system.
THERMOSTAT CONTROL
DANGER
Water temperature over 125°F (52°C)
can cause severe burns instantly
resulting in severe injury or death.
Children, 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.
Read instruction manual for safe
temperature setting.
Hot water temperatures required for automatic dishwasher and laundry
use can cause scald burns resulting in serious personal injury and/or
death. Table 11 shows the approximate time-to-burn relationship for
normal adult skin.
The temperature at which injury occurs varies with the person’s age
and duration of exposure. The slower response time of children, the
elderly or disabled persons increases the hazards to them. 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.
Table 11
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)
TEMPERATURE REGULATION