3.7.2. Proper Flow
a) Using the flow meter on the Apricus pump station you should ensure that the system has the proper flow
rate (1.0gpm/AP-30)
3.8. Boosting
3.8.1. Electrical Boosting
a) Retrofits: Solar thermal may be retrofitted to an electric boosted tank or a dedicated solar pre-heat can
be installed that feeds the existing electric boosted tank.
b) Heating Elements:
i) Twin Tank: If using the electric boosted tank as a secondary tank, which is supplied by solar pre-
heated water, then no change to the element function is required.
c) Solar Integration: Solar needs to be given an opportunity to heat the water in the tank. The element will
only operate for as long as is required to achieve the target temperature, which is normally set at 140F/60C.
3 hours is normally long enough to heat cold water to the required temperature. See also below information
about calculating heating time.
Example: Water volume above the element is 40 gallons, an 80
°
F temperature rise is required and the
element has a 3.6 kW output.
3.6 kW output for 1 hour will provide 12,283 Btu. 40 G x 8.34 lbs = 333.6 lbs of water x 80
°
F = 26,688Btu.
Dividing the required heat by the hourly output will give you the run time: 26,688 / 12,283 = 2.2 hours.
Any modification to the electrical wiring of the storage tank must be completed by an
authorized electrician and meet relevant regulations. Power supply must be turned OFF
and locked (to avoid accidental connection) while any electrical work is being completed.
Take extreme care when working in wet areas to avoid potential contact with energized
wiring.
3.8.2. Instant/Tankless Gas Boosting
a) Pros & Cons: The most efficient and environmentally responsible boosting format for most domestic and
commercial applications is a post-boost, tankless gas booster. The key advantage is that it only heats water
as needed. The solar heated water is only boosted if the temperature is not hot enough. The only real
disadvantage of this system is if the peak hot water demand exceeds the Btu output of the tankless unit,
when the solar storage has been exhausted, the hot water demand at the tap may not be met.
b) Operation: The heater chosen must be able to accept water pre-heated up to 160
°
F (70
°
C) from the
solar tank. If the water is already hot enough, it will pass straight through the booster without causing it to
fire up. If it is not hot enough, the booster will raise it to the 140
°
F (60
°
C) target temperature. This target
temperature is higher than normal for a tankless water heater (normally 122
°
F or 50
°
C) because local
regulations may require it to kill Legionella bacteria. The water exiting the tankless water heater must be
tempered down to 122
°
F (50
°
C) by an anti-scald valve.
Suitable tankless gas water heaters will allow solar heated water to pass straight through if
above the set temperature. To avoid excessively hot water from reaching the household
taps and potentially causing serious burns, an Anti-Scald Valve MUST be installed after the
tankless gas booster to bring the water down to a safe temperature.
Apricus Solar Collector Installation & Operation Manual - USA
Copyright © 2011 – Apricus Inc Doc: A7-05.4.12-PB Page 19 of 129
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