32
2.7. Over ∆T Prevention
It is not preferred that the temperature difference between the inflow water and the outflow water
may exceed a certain limit. The main reason is to protect the heat exchanger of your device from
thermal over-stresses. This function may lower your device’s current operation load by %20, lower
to the load to the system minimum value or due to design and safety purposes, it could take the
boiler to start prevention mode (lockout).
When the ∆T value exceeds the predefined limits, the system behaviour is as follows:
Parametre
Tanım
Açıklama
[3916.1]
Max temp differential flow/return
∆T > [
MaxTdiff flow/return
] :
Load %20 lowered
∆T > [
MaxTdiff flow/return
] + [
SLT delta-T
Offset] : partial load
Output reduced to minimum
[6605.1]
SLT T diff start prev
D
T > [
MaxTdiff flow/return]
+ [
SLT delta-T
[3921.1]
Number of errors delta-T within
24 h
Offset] : start prevention
-
If the ∆T value is higher than [
maximum let ∆T
] value, the boiler load is lowered by %20.
[6604.1]
SLT T diff low-fire
-
If the ∆T value is higher than [
maximum let ∆T
] + [
6604.1
] boiler load lowered to minimum.
-
If the ∆T value is higher than [
maximum let ∆T
] + [
6605.1
] boiler passes to “start prevention” mode.
Water Return (Inflow) Temperature Sensor
Water Exit (Outflow) Temperature Sensor
“Boiler exit end return sensor connections on the mainboard LMS14.”
Summary of Contents for ALDENS 105
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