Glow-worm Clearly Solar System - Manual (Page 6)

6
2.1 Solar gain
The Fluropro solar control works on the principal of differential
temperature control. The control always switches on the
collector pump when the difference in temperature (collector
temperature - cylinder temperature) is greater than the
programmed activation difference.
The controller switches off the collector pump when the
difference in temperature (collector temperature - cylinder
temperature) is less than the programmed deactivation
difference.
The installation engineer activates and configures the solar
gain function within the Fluropro installer menu.
The solar gain is determined from:
– The difference of temperature between the collector flow
and return.
– The flow rate setting of the flow rate adjuster.
– The operating time of the collector pump.
During installation the engineer sets the actual flow rate and
enters the setting into the solar control. The solar gain is
calculated and displayed by the solar control. The total gain
can be called up and reset in the installer menu.
2.2 Solar gain modulation
The rate of solar gain can be modulated to ensure the solar
heat at the bottom of the cylinder has sufficient time to
dissipate to the top of the cylinder. This maintains demand for
solar energy and prevents excessive on and off periods that
are inefficient.
The modulation is achieved by means of more frequent on
and off operations of the solar pump during solar demand.
The pump is switched on and off and the rate depends upon
the difference between the collector temperature and lower
cylinder sensor. When the activation difference is reached, the
function is started (if activated) with an activation duration of
50 % - i.e., the pump is switched on for 30 seconds and then
switched off for 30 seconds. If the difference in temperature
increases, the activation duration is prolonged (e.g., 45
sec. on, 15 sec. off). When the difference in temperature
decreases, the activation duration is reduced (e.g., 20 sec.
on, 40 sec. off). The period length is always a minute.
2.3 Cylinder reheat
The cylinder reheat function allows the cylinder to heat up
to the required temperature during a set time window, even
if the solar gain is insufficient. In this case the water can be
reheated using an external boiler or the immersion heater.
You can set up times for reheating the solar cylinder, refer to
Settings section in Instructions for Use.
2.4 Reheat delay
To prevent unnecessary cylinder reheating by a boiler or an
immersion heater, the Fluropro solar control includes a reheat
delay function. This function delays the cylinder reheat by up
to 30 mins if solar gain is available.
If the solar pump is off and the desired cylinder temperature
is not reached after the delay period, the cylinder will be
reheated using an external boiler or the immersion heater.
The reheat delay function is activated by an engineer within
the Fluropro installer menu.
2.5 Legionella protection
The Legionella protection function is designed to kill germs in
the cylinder and pipes.
When the function is activated, the cylinder, the hot water
pipes, and the circulation pump (if installed), are brought to
a temperature of 70°C on the programmed day(s) and at the
programmed time
In doing so, the cylinder temperature is raised to 70°C and the
corresponding circulation pump is switched on (if installed).
First, an attempt will be made using solar gain alone to reach
the target temperature over a 90 min. period. If this is not
successful, the Legionella protection is carried out using an
external boiler or an immersion heater, whichever has been
set up for this thermal protection. The Legionella protection
function will stop once a temperature of at least 70°C has
been maintained for a period of 30 minutes.
The installation engineer activates the Legionella protection
function within the Fluropro installer menu and specifies
whether the thermal disinfection should take place at 3:30
p.m. or at 4:00 a.m., i.e. offset gain versus cheaper electricity.
2.6 Anti-seize protection for pumps
If no pumping has occurred for 23 hours, all installed pumps
are switched on for approx. 3 seconds to prevent pumps from
seizing.
2.7 Secondary recirculation
The Fluropro solar control includes a programmer channel for
a DHW secondary return. A secondary return should not be
used with Glow-worm twin coil unvented solar cylinders.
2.8 Calendar
The controller is equipped with a calendar so that it can
automatically adjust the clock by 1hr between GMT and BST.
To activate, simply enter the current date within the Fluropro
installer menu
NOTE: In the event of a power failure, the controller only has
a power reserve of 30 minutes. After 30 minutes, the internal
clock stops and the calender will not automatically resume
function once power has been restored. In this case the time
and date will need to be reset.
2 Functions