79
7
Example: (with tank)
The target collector temperature is calculated from:
7.5 Reference value of pump speed control in conjunction with collectors
The controller is equipped with speed control which is
used to drive the pump via direct drve shaft.
This operation depends on the following factors:
•
A prefixed increase is added to the temperature at the
reference sensor (TSU, TPU or TSB).
If a collector supply sensor (TKV) is fitted this is used
instead of the collector sensor (TKO).
The speed control now aims to control the collector
temperature (TKO) or the supply temperature (TKV) to
this value.
•
If the actual collector temperature (TKO) falls towards
the target collector temperature the speed control is
modulated within the given limits.
The switch on and switch off conditions for the
pump can be adjusted (see Ch. 6.3).
If the collector temperature exceeds the storage tank
temperature by + 7K (Tank diff.On) the pump is
switched on, if the collector temperature does not
achieve the value of the “Storage tank temperature
+ 4K” (Tank diff. Off) the pump is switched off.
Note:
Due to the direct drive shaft a pulsating
volume flow is created in the modulation
range, which can be noticeable through noise
and/or vibration of flexible lines.
7.4 Pump standby protection
To avoid seizing of the actuators fitted, outputs X1:1 and
X1:2 are activated every day at 12 o’clock for approx. 35
seconds. The change-over valves are activated for
15 secs. “Open” and 20 secs. “Closed”.
Increase set:
15K
+
Actual tank temperature:
40°C
(TSU)
= Collector setpoint temperature: 55°C
(TKO)
Example: (with tank and collector supply sensor)
The target collector flow temperature (TKV) is
calculated from:
Increase set:
15K
–
Offset:
4K
fixed
+
Actual tank temperature:
40°C
(TSU)
= Collector supply setpoint temp:51°C
(TKV)
•
If the actual collector flow temperature (TKV) falls
towards the target collector flow temperature the
speed control is modulated within the given limits.
Note:
By using a collector flow sensor the
ratings losses are taken into consideration as
much as possible.
Reference value for speed control:
•
Sensor TSO 15K
Increase
•
Sensor TSU 10K
Increase
•
Sensor TPU 10K
Increase
•
Sensor TSB 10K
Increase
•
Offset TKV
- 4K
(no effect with swimming
pool TSB)
Variation: 1…84
Variation: 1…45, 50…84
7.3 Lockout signalling
By connecting an optical or audible signalling device to the
MFA output it is possible to clearly and recognisably
indicate a lockout of the system. The MFA output is a
potential free contact which can be integrated into
systems supplied by others (such as BMS systems).
For this function, the setting “Multi funct. output” must be
set to 9. With this setting the internal relay contact closes
if lockout occurs. With setting 10 the inverse function is
carried out, that means the relay contact opens if a lockout
occurs.
Variation: 1…84
