COMMISSIONING
47
BLEEDING THE SOLAR COLLECTORS
Upon completion of the installation, it is necessary to purge the air from
the collector circuit.
To purge air from the collector circuit:
Ensure the water heater is full of water and all of the hot taps are
turned off.
Using a flat blade screwdriver, open the bleed valve fitted adjacent
to the solar hot water inlet of the solar storage tank (see diagram).
The mains pressure will force water to flow from the tank and
through the pipe work, forcing air from the collector circuit through
the bleed valve. This is evidenced by spurting of water from the
drain line connected to the bleed valve.
Warning:
Stand well aside of the air bleed valve drain pipe
discharge point and exercise care to avoid any splashing of water,
as water or in some circumstances steam discharged from the
solar collectors may be of a very high temperature.
Close the bleed valve when water runs freely from the drain line.
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 collectors
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 collectors 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 collectors 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 collectors. 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.
AIR BLEED VALVE & SOLAR
NON RETURN VALVE ASSEMBLY
Solar Pumped Open Circuit
Содержание Loline 271
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