Acapella Installation Guide
27
en
31
Installation
Indications,
functions and options
Messages
Commissioning
Operation and function
Arrangement 7: Solar system with east-/west collectors and 1 store
The controller calculates the temperature difference between collector sensors
S1 and S3 and store sensor S2. If the differences are larger than or identical to the
adjusted switch-on temperature difference (DT O), one or both solar pumps will
be activated by relay 1 and / or relay 2, and the store will be loaded until the switch-
off temperature difference (DT F) or the maximum store temperature (S MX) is
reached.
Sensor S4 can optionally be used as the reference sensor for the store emergency
shutdown option (OSEM). If heat quantity measurement (OHQM) is activated, S4
and VFD are used as the flow and return sensors respectively.
9 10
VBus
PWM 1/2
VFD
R1
R2
S4 / VFD / TFL
S4 / VFD / TR
S1
S2
S4 /
TSTT
S3
The controller calculates the temperature difference between collector sensors S1 and S3 and store
sensor S2. If the differences are larger than or identical to the adjusted switch-on temperature dif-
ference (DT O), one or both solar pumps will be activated by relay 1 and / or relay 2, and the store
will be loaded until the switch- off temperature difference (DT F) or the maximum store temperature
(SMX) is reached. Sensor S4 can optionally be used as the reference sensor for the store emer-
gency shutdown option (OSEM). If heat quantity measurement (OHQM) is activated, S4 and VFD
are used as the ow and return sensors respectively.
Wiring The System
Do not crosswire the power
cable with the comms cable
on the solar pump. If you do
this you will see a flashing
green light on the pump.
Commissioning
It is important that a motorised flush and fill centre is used to fill and pressurise the system with
solar fluid as follows:
• On dual line pump station connect fill hose to H and connect flush hose to I.
• Close the isolating valve above to the flow meter to ensure all air and liquid passes through the
fill centre to filter any air and contaminants.
• Allow the flush pump to run for 1 minute. Close I and pressure the solar system to 4bar. Close
H once this is reached. Shut off solar fill pump.
• Allow system to stand at 4bar pressure to make sure there is no leaks.
• After this process is completed without any leaks being present open I and H and allow the flush
pump to run.
• While flush pump is running slightly open connections on expansion vessel, pump station and
coil. This will allow any air trapped locally to exit the system easier.
• After this has been completed allow flush pump to run for a further 15 minutes.
• Once this was complete move the fill&flush hoses to the single line pump station and repeat.
• Once you are confident there is no more air in the system (you will be able to see air in the sys-
tem through the flow meter and also by noise it makes), close I first.
• Allow the system to re-pressurise to 2bar. Once achieved, close H and shut off flush pump.
• Not turn on the power supply to the solar controller.
To set up the controller
refer to Manual supplied
in the box with the con-
troller.
