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TEC/TEM owner manual
Figure 2.2.1a
Depending on the auxiliary fuel type, this screen will show how much of
that fuel has been offset by solar. The four possible fuel types for a High
Performance Appliance are electricity, natural gas, propane, and oil. The Space-
Saver™ Appliance can only be supplemented with electricity.
For example, if the daily production from solar is 8219 Wh, then the daily
amount of electricity saved will also be 8219 Wh (see figure 2.1.7). The
lightning bolt (
) – representing electricity as the auxiliary fuel – does not
blink on this screen, indicating that it is showing the fuel-equivalent amount of
energy offset by solar. This value is
under-represented for a High
Performance Appliance
since the calculations can not include the efficiency of
the auxiliary water heater.
Pressing the up button again will show monthly (
) equivalent energy
offset for auxiliary fuel; press again for yearly (
), and once more for
cumulative (
). Up from cumulative shows “daily money saved” (see section
2.1.1).
2.2 Readings displays
The readings that follow show the status of the EnerWorks appliance.
2.2.1
∆
T (temperature difference)
The
∆
T (“delta-T”) value is the
temperature difference between the
solar collector (see section 2.2.2) and
the temperature at the bottom of the
storage tank (see section 2.2.3). When
this difference reaches 10 °C (18 °F),
the appliance will begin to collect solar
energy.
Figure 2.2.1a is an example of
when the system would be operating
with ample solar energy, indicated by
the sun shining on the solar collector (
).
