25
ENGLISH
6.3.7 Minimum speed
This is where the minimum speed of the pump at relay R1 is set. During the setting procedure, the pump runs at the se-
lected speed so that the flow rate can be determined.
Settings range: from “J.14.6 – Speed when On” to maximum speed minus 5% / Default: see table.
6.3.8 Setpoint
This value is the control setpoint. If the temperature at the collector drops below this threshold, pump speed is reduced.
If it rises above the threshold, pump speed increases.
Settings range: 0 °C to 99 °C / Default: see table.
6.5 Relay 4
The additional functions described here can be assigned to spare relays, i.e. relays not used in the respective basic systems.
Additional functions can be used only one at a time, in conjunction with one relay.
R1 and R2: electronic speed control relays
R3 to R6: mechanical relays
R7: relay with voltage-free contacts
V1 and V2: PWM and 0..10V outputs
Pay particular attention to the technical information on the relays.
A symbol appears in the display when the associated function is active.
6.5.1 Solar bypass
Using the relay to activate a bypass valve or bypass pump.
This can direct flow toward the selected storage target when the flow temperature registering at the bypass sensor is less
than that of the storage to be buffered.
Settings range: On, Off
6.5.2 Mode
This menu determines whether the flow is directed through the bypass by a pump or a valve. Settings range: Pump, Valve
/ Factory setting: Valve.
6.5.3 Bypass (sensor)
This menu is used to select the flow sensor for the bypass function. Do not install on the return line. Settings range: S1-S8,
VFS1, VFS2 / Factory setting: none
6.6 Relay 5
See heading 6.5.
6.7 Relay 6
See heading 6.5.
6.8 Relay 7
See heading 6.5.
6.9 Heat output
6.9.1 Fixed flow rate
6.9.1.1 Metering
When the heat meter is set to operate in “flow rate” mode, the system calculates an approximate quantity on the basis of
values entered by the user: type of glycol/antifreeze, concentration of glycol and flow rate. These values are correlated
with the temperatures registering at the collector sensor and the storage sensor. If necessary, a temperature difference
correction value can be set: given that the collector and the storage are used to meter the amount of heat produced, a
difference between flow and return temperatures can be compensated by adjusting the Offset ΔT as appropriate. Set-
tings range: On, Off / Default: Off.
b
The amount of heat measured in “Constant flow” mode is an approximation calculated for system control purposes.
6.9.2 VFS 1
6.9.2.1 VFS type
This menu is used to set the type of Vortex Flow Sensor installed.
Settings range: Off, 1-12, 1-20, 2-40, 5-100, 10-200, 20-400 / Default: see table.
6.9.2.2 VFS position
This menu determines the position of the Vortex Flow Sensor.
Settings range: flow, return / Default: see table
b
To prevent the risk of damaging the vortex flow sensor, installation on the return line is strongly advisable. If installa-
tion on the flow line is unavoidable, make certain that the maximum temperatures of the sensor are not exceeded!
(0 °C to 100 °C and -25 °C to 100 °C short term).
6.9.2.3 Reference sensor
This menu is used to set the reference sensor for heat metering.
Settings range: S1-S8, VFS1-2, active collector, active storage / RC temp / Default: see table.
6.9.2.4 Type of antifreeze
Selection of the type of antifreeze adopted.
Settings range: ethylene-propylene / Default: see table.
Summary of Contents for SC SUN 300
Page 35: ......
