Instruction manual

Page 5
SECTION I: SPECIFICATIONS (cont.)
80STE 75 40 0.8
119STE 110 50 1.2
Model
Actual Tank
Volume (gal)
Electric Heating
First Hour Rating
(gal)
Standby Loss
Rating (°F/hr)
Table 2: Capacity & Performance
SECTION II: GENERAL INFORMATION
SOLAR STORAGE TANK WITH ELECTRIC BACKUP FUNCTION
The solar storage tank is designed to store water that has been directly heated in a solar panel
or indirectly heated by a solar panel through an external heat exchanger.
During periods of water flow through the storage tank, hot water is drawn from the top of
the tank and cold water is delivered to the bottom of the tank (by a diptube or bottom inlet).
If the hot water demand should exceed the solar heat output, the heating element thermostat
will activate the electrical heating element for backup heat.
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
indirect heater and ensure the quality of the water.
TEMPERATURE CONTROL
A solar controller (not provided) shall be used in conjunction with the solar storage tank to
run all solar components in the heating system. The solar controller will be connected to two
thermistors that monitor lower and upper tank temperature. In some cases, only one
thermistor (near the bottom of the tank) will be used. The proper temperature setting for
domestic hot water use is 120°F/49°C.
The solar storage tank is equipped with a backup electrical heating element and adjustable
thermostat. The thermostat is located behind the access cover on the side of the water heater.
If the solar system cannot satisfy the user demand, the electric element will energize and heat
the water until the thermostat is satisfied. An ECO (electrical cut-off) is included as part of
the temperature control and is designed to cut off power to the heating element in the event
the water in the tank reaches 180°F. The ECO is a safety feature on the water heater and
cannot be adjusted. In the event that the ECO opens, the control must be manually reset with
the stored water temperature below 180°F.