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ADJUSTABLE AQUASTAT –
180°F. The temperature may be adjusted from 80°F to 160°F with installed
factory stops. The aquastat (thermostat) was adjusted to 120°F before the
heater was shipped from the factory. It is recommended that lower
temperatures be used to avoid the risk of scalding. Refer to the "Warnings"
and the section on SCALDING in "Section VII – Operating Instructions." It is
further recommended, in all cases, that the water temperature be set for the
lowest temperature that satisfies your hot water needs. This will also provide
the most energy efficient operation of the water heater and minimizes scale
formation.
Setting the water heater temperature at 120°F will reduce the risk of scalds.
Some states require settings to specific lower temperatures.
TEMPERATURE AND PRESSURE RELIEF VALVE
Keep clear of the combination temperature and pressure relief valve
discharge line outlet. The discharge may be hot enough to cause scald
injury. The water is under pressure and may splash. For protection
against excessive temperatures and pressure, install temperature and
pressure protective equipment required by local codes, but not 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 of the Standard for Relief Valves and Automatic Gas
Shutoff Devices for Hot Water Supply Systems, ANSI Z21.22 and the
Standard CAN1-4.4 Temperature, Pressure, Temperature and Pressure
Relief Valves and Vacuum Relief Valves. The combination temperature
and pressure relief valve must be marked with a maximum set pressure
not to exceed the maximum working pressure of the water heater. The
combination temperature and pressure relief valve must also have an
hourly rated temperature steam BTU discharge capacity not less than the
hourly rating of the water heater. The supplied combination temperature
and pressure relief valve, when properly installed and unrestricted, will
discharge the maximum input produced by a 240°F (115°C) boiler supply
temperature. A lower boiler supply temperature will reduce the input
required to be discharged in the event of excessive potable water
temperatures.
Install the combination temperature and pressure relief valve into the
opening provided and marked for this purpose on the water heater.
Some models may already be equipped or supplied with a temperature
and pressure relief valve. Verify that the combination temperature and
pressure relief valve complies with local codes. If the temperature and
pressure relief valve does not comply with local codes, replace it with one
that does.
The thermostat can read from 40°F to
WARNING
11
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