Rinnai
17
Commercial Controller OM
DDSOLAR (COMMERCIAL SOLAR CONTROLLER)
The solar controller's function is to turn the solar pump on and off to collect and transfer solar heated water to
the storage water cylinder. It can be supplied to operate single or dual pumps with the further option to have dual
pumps switched simultaneously or alternatively (12 hour cycle).
IMPORTANT
For single pump systems the pump
MUST
be plugged into the right hand GPO.
The controller determines if there is capacity in the cylinder(s) to store more solar heated water and when the
temperature difference between the cylinder(s) and collector(s) is suitable for energy collection the controller will
activate the circulating pump(s).
Solar gain pump 'ON'
1
2
3
4
INFO
MAINT
TANK TEMPERATURE 17
COLLECTOR TEMP. 37
PUMP COLLECTING
No solar gain pump 'IDLE'
1
2
3
4
INFO
MAINT
TANK TEMPERATURE 34
COLLECTOR TEMP. 30
PUMP IDLE
When there is a differential temperature between the solar collector (hot sensor) and the tank (cold sensor)
the
circulating pump is switched on. When differential falls to below the predetermined limit the circulation pump is
then switched off.
Over Temp. Protection
When the tank temperature sensor reaches the predetermined set point the pump is de-energised. This prevents
water that is too hot returning from the solar collectors to the storage cylinder and activating the P&TR valve.
Alternatively if the collector temperature is over the safe operating temperature the controller de-energises the
pump.
Frost Protection
The other function of the controller is to circulate water through the collectors when there are low ambient
temperature frost conditions to prevent the collector from freezing. When the hot temperature sensor (in collector)
drops below the pre-determined limit the pump activates to prevent freezing. The circulator will stop once the hot
sensor temperature increases. This is a function that is selected from the SET menu.
IMPORTANT
This function
MUST
be enabled, in areas that may experience low temperatures and to comply
with warranty conditions.
DDSOLAR OPERATION