Specifications

COMMISSIONING
50
SOLAR CONTROLLER OPERATION AT START-UP
When the electrical supply is switched on to the solar control unit at start up:
If there is no solar gain, the circulator will not activate and the green LED will emit a slow pulse.
The slow pulse indicates the circulator is not activated and the power to the solar control unit has been
on for less than 48 hours.
If there is solar gain, the circulator activates and the green LED will emit a series of three (3) flashes.
The three (3) flashes indicate the circulator is operating and power to the solar control unit has been on
for less than 48 hours.
 The circulator will operate at full speed for approximately fifteen (15) seconds.
After fifteen (15) seconds, the solar controller will commence to pulse the circulator to reduce the
flow rate through the collector circuit. This will increase the temperature rise across the solar
collector(s) and assist in maximising the system efficiency for the available solar energy. It is normal
operation for the circulator to experience a pulsing effect.
The red LED may emit a rapid pulse for a short period (whilst the green LED is emitting a series of
three (3) flashes), particularly if the solar collector(s) were left uncovered during the final stages of the
installation and commissioning procedure.
This indicates a temperature difference between the hot sensor and cold sensor of greater than 45°C
and does not represent a fault code. This is the result of a build-up of heat and increase in water
temperature in the solar collector(s) prior to the switching on of the electrical supply to the solar control
unit.
The rapid pulsing of the red LED will cease as the water circulates and the heat is dissipated from the
solar collector(s). This should be within four (4) to five (5) minutes of start up, but may take up to ten (10)
minutes.
Whilst the red LED is emitting a rapid pulse, the circulator will operate at full speed. After the red LED
has extinguished, the solar controller will commence to pulse the circulator to reduce the flow rate
through the collector circuit.
If the red LED does continue to emit a rapid pulse for longer than ten (10) minutes, this may indicate
water is not circulating through the solar collector(s) and solar circuit:
 switch off the electrical supply at the power outlet to the solar control unit
 repeat the procedure to bleed the solar collector(s)
 switch on the electrical supply at the power outlet to the solar control unit.