8
4.9 Tap and pool water heating with the use of a three-way valve, controlling operation of 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 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 reaches the set value, the controller will switch the U valve back into the B heater direction and will switch the collector pump off.
When the collectors heat the water in the A pool, the controller will force the collector pump to switch off once an hour for 10 minutes in order to check the conditions for heating the B
heater and switch heating back to B heater (testing active if the B heater is underheated).
ATTENTION !
When the test is active, the T1 sensor temperature value flashes on the screen.
Heating the B heater and water in the A pool has been described for priority
B > A
. If priority
A > B
is set, the heating plan is the reverse of the one presented above.
In addition, it is possible to select the absolute priority of the B heater. Heating the B heater 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 ! If the C pool pump is switched off when the solar collector pump is working and the U valve is set to the pool may damage the piping system of the pool circuit.
In order to protect the exchanger against lack of heat collection by the pool pump, 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 additional pump, controlling operation of the pool water pump - scheme no 10
Controlling P collector pump for heating the heater and K collector pump for heating the pool exchanger – selected priority: B > A
Heating with the use of B heater collector 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 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 K collector pump and C pool pump off. When the collectors heat the water in the A pool, the controller will force the collector pump
to switch off once an hour for 5 minutes in order to check the conditions for heating the B heater and switch heating back to B heater (testing active if the B heater is underheated).
ATTENTION !
Heating the B heater and water in the A pool has been described for priority
B > A
. If priority
A > B
is set, the heating plan is the reverse of the one presented above.
Selecting priority B will result in the operation as described in the scheme 9 – see point 4.9.
Controlling pool pump
Similarly as in scheme no 9 - description in point 4.9.
Fig. 12. Schematic and electrical diagram of installation no 10.
