P32-EN – Subject to technical changes 04.11
58
Additional Information for Installers
Auxiliary start function for evacuated tube collectors
Activate this function only when use evacuated tube collec-
tors from SolvisLuna. Sometimes heated heat transfer fluid
covers the sensors on these collectors too late, meaning
the solar pump starts too late. This function briefly acti-
vates the solar pump at specific intervals, transporting the
contents of the collector to the sensor to determine the
actual temperature for normal operation. To save energy,
flush intervals only occur when the weather makes them
necessary. The controller determines whether this is the
case based on the temperature measured at the collector.
You can activate this function beginning at “Technician”
(
page 25
) operating mode as follows:
1 2 3 4 5 6 7 8 9 10 11 12 13 14
START FUNCTION
BROWSE
BACK
Interval:
20 min
Activation Time:
07.00 - 20.00 h
Run Time:
15 sec
Setting an activation time for the auxiliary start
function
1 2 3 4 5 6 7 8 9 10 11 12 13 14
BACK
SOL START
Status:
ON
ENABLE START FUNCT.:
Source:
User
INPUT VARIABLE
Activating the auxiliary start function at the pointer
position
by pressing the rotary wheel
1 2 3 4 5 6 7 8 9 10 11 12 13 14
START FUNCTION
BROWSE
BACK
Aktiv.Grad:
20
Start Tests:
0
Unsuccessful:
0
Since Last Run:
0
Setting an activation gradient and displaying start
attempts for the current day
In the main menu, select the “Functions” menu item and
press the rotary wheel. Select the menu item “PAR?” of
function “8: START FUNCTION” and press the rotary wheel.
In the start function menu turn the rotary wheel until the
pointer is behind “INPUT VARIABLE:” and press the rotary
wheel. In the Input Variable menu, select the entry
“Status: OFF” below the “ENABLE START FUNCT” line.
Press the rotary wheel and turn it until “ON” appears
(
figure above
). Activate the auxiliary start function by
pressing the rotary wheel once more. “BACK” takes you
back to the Start Functions menu, where you will find the
possible settings listed below. You can view other menu
entries there by turning the rotary wheel (
bottom figures
).
Use “BACK” to return to the Solar control menu.
You have the following setting options:
1. “07:00” – “20:00“
: The period when the auxiliary start
function is active (factory settings).
2. “Run Time”
: Runtime of the solar pump
(0... 120 s, factory setting: 15 s)
3. “Interval”
: Interval before the solar pump restarts.
Maximum value; the interval is automatically adjusted
to the current change in temperature at the evacuated
tube collector. (0... 120 min., factory setting 20 min)
4. “Aktiv.Grad”
: Activation gradient (0… 99, factory
setting: 20). Solar pump switch-on threshold when the
collector temperature is warmer (by “Aktiv.Grad”) than
the mean of the last 250 minutes.
Lower numerical values: Frequent start attempts (risk:
Unnecessary power consumption from too many start
attempts). Higher numerical values: Fewer start
attempts (risk: The solar pump switches on too late,
causing you to loose some solar energy).
Fine adjustment
: If more than ten start attempts are
needed for a solar run, raise the “Aktiv. Grad.”. For less
than four start attempts, lower the “Aktiv. Grad.”.
10.3.4 “START FUNCTION”
