![background image](http://html.mh-extra.com/html/paw/sc5-14/sc5-14_manual_764022045.webp)
en
45
8.3
Function control
D
T monitoring
This function can be used for monitoring the temperature difference. The message
D
T too high is shown, if solar loading has been carried out for a period of 20
minutes with a differential higher than 50 K. Normal operation is not aborted or
inhibited, but the system should be checked for the cause of the warning.
Solar / Functions control
Adjustment
channel
Description
Adjustment range /
selection
Factory setting
D
T too high
Option
D
T monitoring
Yes, No
Yes
Night circu-
lation
Night circulation monitoring
option
Yes, No
Yes
FL/RE inter-
changed
FL/RE interchange monitoring
option
Yes, No
Yes
!Store max.
temp.!
Maximum store temperature
monitoring option
Yes, No
No
Store
Store sensor selection
system dependent system dependent
Possible causes are:
• pump power too weak
• blocked system components
• circulation problems in the collector
• air inside the system
• defective valve/ defective pump
Night circulation
This function can be used for detecting thermal circulation inside the solar circuit
that leads to an unwanted cooling of the store. A warning message will appear
when one of the following conditions has been detected for at least 1 min during
the period between 11 p.m. and 5 a.m.:
• collector temperature exceeds 40 °C
• the temperature difference exceeds
D
Ton
The delay time of 1 min ensures that the message is not triggered by short-term
fault conditions.
Possible causes are:
• defective non-return valves
• defective valve
• wrongly adjusted time
Flow and return pipe interchanged
This function is used for detecting an interchange of the fl ow and return pipe or a
badly placed collector sensor. For this purpose, the collector temperature is mon-
itored for plausibility during the switch-on phases of the solar pump. The message
FL/RE interchanged will appear, when the plausibility criteria have not been met
5 times in a row.
Only if the expert code is entered (see page 67), will the option be available.
Maximum store temperature
This function is used for detecting and indicating if the adjusted maximum store
temperature has been exceeded. The controller compares the current store tem-
perature to the adjusted maximum store temperature, thus monitoring the store
loading circuits.
The maximum store temperature is considered exceeded when the temperature
measured at the store sensor exceeds the adjusted maximum store temperature by
at least 5 K. The monitoring becomes active again as soon as the store temperature
falls below the adjusted maximum store temperature.
In the Store channel, the store or stores to be monitored can be selected.
A possible cause for an unwanted exceedance of the maximum store temperature
is a defective valve.
Summary of Contents for SC5.14
Page 78: ...en 78 ...
Page 79: ...en 79 ...