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General Information
Important Regulatory and Installation Requirements
The following chart details the relationship between water
temperature and time for scalding injury to occur.
Approx. Water
Temperature
120° F (49.0° C)
125° F (51.5° C)
130° F (54.5° C)
135° F (57.0° C)
140° F (60.0° C)
145° F (63.0° C)
150° F (63.5° C)
155° F (68.5° C)
Anode rods
The anode rod is used as a consumable element within
the volume of the storage tank. The purpose of the
magnesium anode rod is to protect the inside of the tank
against corrosion. The anode rod should be inspected
twice in the first year and at least yearly once a time
interval for inspection has been developed. Water
conditions can influence the consumption rate of the
anode rod. Please see the maintenance section of this
manual for instructions on how to change the anode rod
in your water heater.
CAUTION
Hydrogen gas is produced in a hot water system served
by the heater that has not been used for a long period
of time (2 weeks or more). Hydrogen gas is extremely
flammable. To reduce the risk of injury under these
conditions, it is recommended that the hot water faucet
be opened for several minutes at the kitchen sink before
using any electrical appliance connected to the hot water
system. When hydrogen is present, there will probably
be an unusual sound such as air escaping through the
pipe as the water begins to flow. There should be no
smoking or open flame near the faucet at the time it is
open.
6
Time to produce 2nd and 3rd
Degree burns on adult skin
more than 5 minutes
1.5 to 2 minutes
about 30 seconds
about 10 seconds
less than 5 seconds
less than 3 seconds
about 1.5 seconds
about 1 second
Vitocell 100-VH/-BH Installation/Operation/Service
(continued)
Temperature and pressure relief valve (T&P Valve)
CAUTION
To reduce the risk of excessive pressures and
temperatures in this water heater, install temperature
and pressure protective equipment required by local
codes and no less than a combination temperature and
pressure relief valve certified by a nationally recognized
testing laboratory that maintains periodic inspection of
production of listed equipment or materials, as meeting
the requirements for Relief Valves and Automatic Gas
Shutoff Devices for Hot Water Supply Systems, ANSI
Z21.22. This valve must be marked with a maximum
set pressure not to exceed the marked maximum
working pressure of the water heater. Install the valve
in an opening provided and marked for this purpose in
the water heater, and orient it or provide tubing so that
any discharge from the valve exits only within 6 in.
above, or at any distance below, the structural floor,
and does not contact any live electrical part. The
discharge opening must not be blocked or reduced
in size under any circumstances.
Backflow preventer (closed loop system)
Some local municipal codes and ordinances require the
use of these devices on potable (domestic) water lines.
Where backflow preventers are required, it will be
necessary to install a thermal expansion tank (designed
for used with potable water) in order to prevent pressure
build up in the indirect heater and associated piping,
which could cause the T&P valve to discharge. Follow
the expansion tank manufacturer's recommendations
when selecting a tank for your hot water system.
Product information
79 USG (300 L) and 119 USG (450 L) capacity
Enameled indirect-fired domestic hot water storage tank
with one or two heat exchanger coils.
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