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APPROXIMATE
TEMPERATURE/TIME
RELATIONSHIPS TO
SCALDING
120°F (49°C)
More than 5 minutes
125°F (52°C)
1
1
⁄
2
to 2 minutes
130°F (54°C)
About 30 seconds
135
°F (57°C)
About 10 seconds
140°F (60°C)
Less than 5 seconds
145°F (63°C)
Less than 3 seconds
150°F (66°C)
About 1
1
⁄
2
seconds
155°F (68°C)
About 1 second
Table 2:
Scald Temperature/Time Relationships
SECTION II: GENERAL INFORMATION
WHEN YOU RECEIVE YOUR NEW WATER HEATER
Check the new equipment to see if all components are in good condition. If damage is
observed or parts appear to be missing, contact your wholesaler.
WATER TREATMENT/FILTRATION
In areas where poor water conditions are suspected (i.e. lime, iron, and other minerals), it is
essential that the water be tested and appropriate action taken to prevent damage to the
water heater and ensure the quality of the water.
TEMPERATURE CONTROL
The water heater is equipped with a combination gas valve, ignition control, and thermostat.
For domestic hot water, the proper temperature setting is 120°F (i.e. “WARM” setting on
control). For commercial applications, the maximum approved temperature setting is 180°F
(i.e. “F” setting on control).
A built-in, automatic reset Energy Cut-Off (ECO) is standard on all models. In the event that
the water temperature becomes excessive (195°F), the ECO will shut off all gas to the water
heater. If the ECO switch opens, it will automatically reset (or close) when the water
temperature drops to 120°F or below. The water heater thermostat will automatically reset
following a three minute standby period once the ECO switch closes.
The thermostat is factory set at 120°F. See Figure 21 for temperature and display settings.
If hotter water is required a tempering device or anti-scald device must be installed at the
domestic hot water outlet of the heater or at the point of use. Table 3 details the approximate
relationship of water temperature and time with regard to scald injury. It is important for the
user to understand the necessity of tempering or anti-scald devices when using hotter water in
domestic water heating systems.
CAUTION: Hot water in excess of 120
°
F can cause scalding!
Bock recommends
a tempering valve or anti-scald valve be installed and used according to
the manufacturer’s directions to prevent scalding. Many state and local codes now require
installation of these devices. Point of use temperature may be hotter than the setting on the
water heater thermostat. The tempering valve or anti-scald valve will ensure potable
water temperatures at the desired set point with a higher degree of accuracy.
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