Thermo Technologies SMT 100 - Manual (Page 9)

8
SUGGESTED CIRCUITS
1 Example of solar hot water system with electric auxiliary heater. An external
timer (switch-on time for example from 1700 to 1900) should govern the
auxiliary heater and the thermostat switch set at TT. This means the
immersion will be activated only if the temperature of the tank (hot water
cylinder) at 1700 hours is lower than the set temperature.
NOTE: If the outputs from the Auxiliary relay are required to drive a heater
with a current rating greater than 3A than a contactor should be used.
Thermomax can supply an intermediate device, which may be connected to
the SMT 100 to drive an auxiliary load of up to 16A – Part No. C0328.
2 Example of a solar hot water system gas or oil auxiliary heating. Logic as 1
above.
3 Example of solar hot water system with two users. is the main solar
storage tank, which has an auxiliary heater as in 1 and 2. is the second
user (swimming pool or floor heating etc). The heated water from the
collector will be circulated by the pump, to user when the temperature
in Tank reaches the set temperature TT - i.e. stops and will run
(cascade!).
4 Example of a solar pre-heating system. When the temperature of the solar
hot water tank reaches the pre-set level of TT, the water out of the hot water
tap is completely solar heated. For temperatures below the pre-set level, the
solar system is pre-heating the water in the main hot water tank. This
function is regulated by means of a 3 way motorised valve, which is activated
by the solar controller.