Thermo Technologies SMT 100 - Manual (Page 12)

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3.2.3 FROST PROTECTION:
As a safety feature for the protection of your solar heating equipment, the
SMT 100 provides frost protection facilities. If the collector sensor
measures a temperature below –15°C, (–15°C default), it activates the pump
to circulate water through the system. This will prevent freezing, thereby
avoiding permanent damage. The minimum permitted temperature is called
TF. To adjust TF, see section 3.3.7.
3.2.4 STORAGE TANK LIMIT TEMPERATURE:
The SMT 100 has a useful feature to allow maximum temperature from solar
to be limited inside the storage tank (cylinder). The controller can switch off
the circulation pump if the stored temperature reaches TS (90°C default).
This value may be set from 60°C to 90°C, (see section 3.3.7). This value
should NOT be set below 90°C unless for special applications.
NOTE: Stagnation could damage automatic air vent and open pressure relief
valve, if fitted close to the collector.
3.3 PROGRAMMING THE SMT 100
3.3.1 DISPLAYING THE COLLECTOR TEMPERATURE
When the unit is switched on, it goes through an initialisation routine that
lasts about 3 seconds and ends with two bleeps. The default display select is
the collector temperature. The Display select indicator will be constantly ON
(NOT flashing) to inform you that the “keypad lock” is engaged and the SMT
100 unit is in DISPLAY MODE. A full stop will also appear on the display to
inform the user of a “key lock”. Pressing the selector key will advance the
display selector lamp to the next option. To advance quickly, hold the key
for an auto-repeat facility.
3.3.2 DISPLAYING THE TANK TEMPERATURE
To view the Tank temperature, press the key until the selector lamp is
illuminated.
3.3.3 DISPLAYING THE ACTUAL TEMPERATURE
To view the Actual temperature, press the key until the selector lamp is
illuminated. Please note that this displays the Collector Temperature minus
the Return Temperature. (Coll Temp - Ret Temp).
3.3.4 SETTING THE MINUMUM COLLECTOR TEMPERATURE
Before setting TC, TT or the SMT100 unit must be in PROGRAMMING
MODE. This is achieved by pressing and holding the key for eight
seconds. This will cause the display selector lamp to flash indicating that the
keypad lock is OFF and the unit is in PROGRAMMING MODE. Press the
key until the selector lamp is illuminated, then press the or keys to
set the required minimum collector temperature TC (we recommend minimum
+30°C,maximum +45°C).
3.3.5 SETTING THE TANK OR AUXILIARY TEMPERATURE
Press the key until the selector lamp is illuminated, then press the
or keys to set the required Tank temperature TT (minimum 0°C, maximum
+90°C).