41
COMMISSIONING
TO FILL AND TURN ON THE WATER HEATER
The power supply to the solar storage tank and solar control unit must not be switched on until the
water heater is filled with water and a satisfactory megger reading is obtained.
Open all of the hot water taps in the house (don‟t forget the shower).
Open the cold water isolation valve fully on the cold water line to the water heater.
Air will be forced out of the taps.
Close each tap as water flows freely from it.
Check the pipe work for leaks.
Bleed the solar collectors (refer to “Bleeding the Solar Collectors” on page 42).
Plug in the solar control unit at the power outlet and switch on the electrical supply.
The power outlet must be switched on for the solar control unit to operate and solar gain to be achieved.
Note: 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. If the red LED is
emitting a rapid pulse, the circulator may operate at full speed for up to ten (10) minutes.
After fifteen (15) seconds or after the red LED has extinguished, the solar controller will commence
to pulse the circulator to control the flow rate through the collector circuit and achieve a constant
temperature rise across the collector(s). It is normal operation for the circulator to experience a
pulsing effect.
The red LED may emit a rapid pulse for a short period.
This indicates a temperature difference between the hot sensor and cold sensor of greater than
40°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 collector 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. This
should be within four (4) to five (5) minutes of start up, but may take up to ten (10) minutes.
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 collectors and solar circuit:
switch off the electrical supply at the power outlet to the solar control unit
repeat the procedure to bleed the solar collectors
switch on the electrical supply at the power outlet to the solar control unit
Switch on the electrical supply at the isolating switch to the solar storage tank.
Set the timer if one is installed (refer to “Booster Control” on page 39).
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