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SECTION V: OPERATION
INITIAL START-UP
Reference the solar collector installation instructions for proper start-up of the solar collector.
Be sure that fluid flow in the solar system is established.
HEATING OPERATIONS
Condition 1: The minimum temperature difference (for heat transfer) between the potable
water at the bottom of the tank and the solar collector is sensed by the solar controller. In
addition, the tank temperature is below the maximum tank temperature setpoint (on solar
control).
Action 1: The solar controller energizes a pump to flow fluid through the solar
collector and heat exchanger. Heat is transferred to the potable water until
the temperature difference is reduced to a desired value or the maximum tank
temperature has been reached.
Condition 2: The heating element thermostat senses that the potable water temperature in
the upper area of the tank drops below the thermostat set-point.
Action 2: The heating element is energized and heats the potable water to the set-
point temperature, at which point the element is de-energized.
THERMOSTAT TEMPERATURE ADJUSTMENT
CAUTION
The temperature setting on the heating element thermostat shall not exceed 160°F.
Likewise, the solar controller potable water temperature setting shall not exceed 160°F.
Install a tempering valve or anti-scald mixing valve at the outlet of the water heater to
ensure greater control over water temperatures at the point of use.
CAUTION
Turn off all power to the water heater before adjusting the heating element thermostat.
The heating element thermostat is factory adjusted to 120°F (“HOT” indicator setting). If
thermostat adjustment is necessary, disconnect all power to the water heater and solar
collector. Remove the access cover on the side of the water heater and remove the foam dam
insert to expose the thermostat and heating element. The temperature knob can be adjusted
with a screwdriver to a minimum temperature of 110°F and a maximum temperature of
160°F (labeled “VERY HOT”). See Table 6 for a listing of indicator setting and temperature
relationships.
Indicator Setting Temperature (°F)
s 110
HOT 120
A 130
B 140
C 150
VERY HOT 160
Table 6: Thermostat Temperature Settings
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