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8
A.
Do
turn off power to water heater if it has been subjected to over heating,
fire, flood or physical damage.
B.
Do Not
turn on water heater unless it is completely filled with water.
C.
Do Not
turn on water heater if cold water supply shut-off valve is closed.
D. If there is any difficulty in understanding or following the OPERATION or
MAINTENANCE instructions, it is recommended that a qualified person
or serviceman perform the work.
NEVER use this water heater unless it is completely full of water.
To prevent damage to the tank and heating elements the tank
must be filled with water. Water must flow from the hot water
faucet(s) before turning power ”ON”
1. WATER TEMPERATURE SETTING AND THERMAL PERFORMANCE
Water heaters see a wide range of applications. Some of the most chal-
lenging are those involved in thermal storage, tempering valves or large
volumes of heated water used for cleaning and sanitizing.
Achieving satisfactory service from a water heater in these applications is
critical. The solution is found in understanding the operation of the typical
water heater. In a dual element water heater, the upper thermostat is given
priority and will operate first when the tank is completely cold. By operating
first, a small amount of hot water is available quickly. When the upper ther-
mostat is satisfied, the electrical current is switched to the lower thermostat.
As the lower element begins to heat the water above it, energy (heat) is
also being put into the water at the very top of the tank. If the upper ther-
mostat is set at, or very near its upper limit, the temperature at the top of
the tank can possibly be elevated to the point of tripping the T & P valve or
the Thermal Cut-Out on the upper thermostat. In either case, the mecha-
nisms sense temperatures beyond the predetermined limit and activate to
lower the temperature. In other words, they do their job.
Reliable performance can be achieved in most applications if the upper
thermostat is left at the factory set temperature of 120°F. During heavy
water usage, the upper thermostat will provide a limited amount of hot
water quickly. The temperature of this water at the factory set temperature
will satisfy most household needs. After the upper thermostat is satisfied,
the lower thermostat will then heat all of the water in the tank to it desired
setting. This temperature setting method will not increase the total heating
time or reduce the final temperature of the water in the tank. For normal
applications it is recommended that the upper thermostat be left at the fac-
tory set temperature of 120°F and all water temperature adjustments be
made at the lower thermostat only.
If an application requires adjustment of the upper thermostat, it can be
adjusted by following the instructions in the ”Resetting the Thermostat”
section later in this manual. To achieve the most consistent operation,
have the upper thermostat adjusted 10 to 15 degrees below the setting of
the lower thermostat. This will reduce the ”stacking” effect inside the water
heater, but will still allow the water heater to produce water at the desired
temperature.
Caution is important in installations where very high water temperatures
are needed for a required application. Water at high temperatures can
quickly cause severe scalding, especially in children or elderly people. It is
strongly recommended that great care be taken to prevent scalding. A tem-
pering valve must be used in any area used for washing or bathing, and
where access is available to the elderly or children. We also recommend
that the thermostats be set at the lowest possible setting to meet the appli-
cation. Please refer Thermostat Setting section of this manual for additional
information and recommendations.
One other reminder is to be sure that the T & P Valve is properly installed.
It is a plumbing code requirement in most parts of the country to plumb the
T & P Valve to discharge within six inches of the floor. This is clearly
described in the Installation section of this manual. Failure to do this is not
only a violation of the plumbing code, but a safety hazard for anyone near
the water heater in the event the T & P discharges. Not having the T & P
plumbed with a drain line also allows water to be potentially discharged
onto the top of the water heater if the valve opens. The consequence of
this could be inaccurate temperature sensing by the thermostats, if they
are cooled by the discharged water as it evaporates. Another negative
result could be saturated insulation, which would waste energy, be the
source of a high bill complaint and reduce the insulation’s ability to support
the tank.
In conclusion, non-metallic water heaters are designed and built to provide
years of service. Having them properly installed and accurately adjusted is
essential if they are to perform reliably in the many challenging applications
in which they are installed.
2. WATER TEMPERATURE SETTING — To comply with safety regulations
the thermostats are factory set at 120° F. or less where local codes require,
and is usually sufficient for most household needs.
Maximum water temperatures occur just after the elements have shut off.
To find out exact temperature of the water being delivered, turn on a hot
water faucet and allow it to run until maximum temperature is reached,
then insert a thermometer in the water stream and read the temperature.
Safety and energy conservation are factors to be considered when select-
ing the water temperature setting of the water heater’s thermostats . The
lower the temperature setting the greater the safety and savings in energy
and operating costs. If a different temperature setting is desired, read and
follow the following warnings and instructions.
There is a Hot Water SCALD Potential if the thermostat is set too
high.
NOTE: Households with small children or invalids may
require a 120° F. or lower thermostat setting to prevent con-
tact with “HOT” water.
Mixing valves for reducing point of use water temperature by mixing hot
and cold water in branch water lines are available. Contact a licensed
plumber of the local plumbing authority for further information.
The following chart may be used as a guide in determining the proper
water temperature for your home.
SAFETY PRECAUTIONS
DANGER
!
CAUTION
!
Operation
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