7
Controlling the U three-way valve.
The three-way valve will be switched into theA heater direction if the T2 temperature at the collector heater gets higher by the“Temperature difference ON add. pump, valve” value
than the T4 temperature in the circulation return. The valve will switch into the direction of A heater if the difference in temperatures (T2-T4) falls below the set value. Else, circulation
return will always be directed to the Bboiler heater.
Fig. 10. Schematic and electrical diagram of installation no 8.
4.9 Tap and pool water heating with the use of a three-way valve, controlling operationof the pool water pump - scheme no 9
Controlling collector pump and U three-way valve – selected priority: B >A
Supplying solar energy to B heater is analogical as in the scheme no 1 and has been described in point 4.1.
The A pool constitutes yet another heat receiver. If conditions do not allow for heating the B heater or the “MaxTemp. T2 OFF collector’s pump”, set by the user has been reached,
the controller will automatically start heating water in the A pool. This happens once the U three-way valve gets switched into the A pool direction if the T1 temperature of the solar
collector gets higher, by the “Temperature difference ON add. pump, valve”, than the T4 temperature of water in the pool.
The pump willremain switched onuntil the difference in temperatures (T1-T4) falls below the set value and the temperature in thepool reaches the set value of„ Max. temp. T4 OFF
heat source”. When the T4 temperature reaches the set value, the controller willswitch the U valve back into the B heater direction andwillswitch the collectorpump off.
When the collectors heat the water in the A pool, the controller will force the collector pump to switch offonce an hour for 10 minutes in order to check the conditions for heating the B
heater and switch heating back to Bheater (testing active ifthe B heater is underheated).
ATTENTION!
When the test is active, the T1 sensor temperature value flashes on the screen.
HeatingtheBheaterand waterintheApoolhasbeendescribedforpriorityB > A.IfpriorityA > B isset,theheatingplanisthereverseofthe onepresentedabove.
In addition, it is possible to selectthe absolute priority of the B heater.Heating the Bheater will only take place when:
-the value “MaxTemp. T2 OFF collector’s pump” set by the user is reached and “Overheat protection of collectors” is disabled;
- the value “MaxTemp. T2 OFF overheat protection” set by the user is reached and “Overheat protection of collectors”is enabled.
Controlling pool pump
The C pool pump is switched on in the time programmed by the user in the “C time program” option to be found in the “Parameter settings” menu. The C pool pump is always
switched on when pool water is heated with solar collectors.
ATTENTION!
IftheCpoolpumpisswitchedoffwhenthesolarcollectorpumpisworkingandtheUvalveissettothepoolmaydamagethepiping systemofthepoolcircuit.
In order to protect the exchanger against lack of heat collectionby the poolpump,a T4 sensor should be installed on the exchanger shell surface.
Fig. 11. Schematic and electrical diagram of installation no 9.
4.10 Tap and pool water heating with the use of an additionalpump, controlling operation of the pool water pump - scheme no 10
Controlling Pcollectorpump for heating the heater and K collector pump forheating thepool exchanger – selected priority:B > A
Heating with theuse of B heater collector isanalogical as in the schemeno 1 and has been described inpoint 4.1.
The A pool constitutes yet another heat receiver. If conditions do not allow for heating the B heater or if “MaxTemp. T2 OFF collector’s pump” set by the user has been reached, the
controller will automatically start heating water in the A pool. This happens by switching the P pump off and the K collector pump and the C pool pump on if the solar collector T1
temperature gets higher by the value of “Temperature difference ON add. pump, valve”, than the T4 temperature of water in the pool. The pumps will remain switched on until the
difference in temperatures (T1-T4) falls below the set value and the temperature in the pool reaches the set value of “Max. temp. T4 OFF heat source”. When the T4 temperature
exceeds the set value, the controller will switch the Kcollector pumpand C pool pumpoff. When the collectors heat the water in the Apool, the controller willforce the collectorpump
to switch off once an hour for 5 minutes in order to check the conditions for heating the Bheater and switch heating back to Bheater (testing active if the B heater is underheated).
ATTENTION!HeatingtheBheaterandwaterintheApoolhasbeendescribedforpriority B > A.IfpriorityA > B isset,theheatingplanisthereverseoftheonepresentedabove.
