John Wood Electric Water Heaters - NEW - Manual (Page 13)

13
HOTTER WATER CAN SCALD: Water heaters are intended
to produce hot water. Water heated to a temperature which
will satisfy space heating, clothes washing, dish washing, and
other sanitizing needs can scald and permanently injure you
upon contact. Some people are more likely to be permanently
injured by hot water than others. These include the elderly,
children, the infirm, or physically/mentally disabled. If anyone
using hot water in your home fits into one of these groups
or if there is a local code or state law requiring a certain
temperature water at the hot water tap, then you must
take special precautions. In addition to using the lowest
possible temperature setting that satisfies your hot water
needs, a means such as a mixing valve should be used at
the hot water taps used by these people or at the water
heater. Mixing valves are available from your local plumbing
contractor. Follow manufacturer’s instructions for installation
of the valves. Before changing the factory setting on the
thermostat, see Figure 8.
Never allow small children to use a hot water tap or to draw
their own bath water. Never leave a child or handicapped
person unattended in a bathtub or shower.
It is recommended that lower water temperatures be used
to avoid the risk of scalding. It is further recommended,
in all cases, that the water temperature thermostat be
set for the lowest temperature which satisfies your hot
water needs. This will also provide the most energy
efficient operation of the water heater. Thermostat(s) are
factory set at 140°F (60°C) unless specified differently by
provincial requirements.
TEMPERATURE REGULATION
WATER TEMPERATURE OVER 125°F (52°C) CAN CAUSE
SEVERE BURNS INSTANTLY OR DEATH FROM SCALDS.
Figure 8 shows the approximate time-to-burn relationship for
normal adult skin.
TEMPERATURE ADJUSTMENT
To change the temperature setting:
NOTE: It is not necessary to adjust the upper thermostat. However, if it
is adjusted above the factory set point (140°F (60°C)) it is recommended
that it not be set higher than the lower thermostat setting.
1. Turn off the heater electrical supply. Do not attempt to adjust
thermostat with power on.
2. Remove the thermostat access panel(s) and fold up the insulation
to expose the thermostats. Do not remove the plastic personnel
protectors covering the thermostats.
3. Using a fl at tip screwdriver, rotate the adjustment knob to the
desired temperature setting.
4. Replace the insulation and access panels and turn on heater
electrical supply.
FIGURE 8.
TEMPERATURE SETTINGS
It is recommended that the dial be set lower whenever possible.
Time to Produce 2nd & 3rd
Setting Degree Burns on Adult Skin
160°F (71°C) About 1/2 second
150°F (66°C) About 1-1/2 seconds
140°F (60°C) Less than 5 seconds
130°F (54°C) About 30 seconds
120°F (49°C) More than 5 minutes
Temperature