Steca TR A502 TT - Maximum Collector Temperature; Minimum Collector Temperature; Switch-on Temperature Difference Heating Return Increase; Switch-off Temperature Difference Heating Return Increase

46
742.114 | 14.50
EN
Display Parameter min. max.
Factory setting
Functionality
Maximum collector
temperature
T
P11
+ 40 F 350 °F 270 °F When the maximum collector
temperature is exceeded, no
more loading occurs until
the temperature drops to 6 F
below the set value.
Minimum collector
temperature
32 °F T
P10
– 40 F 32 °F Load only starts when the
minimum collector tempera-
ture is exceeded.
Switch-on tempera-
ture difference heat-
ing return increase
T
P13
+ 4 F 100 F 12 F The heating return increase is
switched on (switching valve
on) when the switch-on tem-
perature difference between
the storage tank and heating
return temperature is reached.
Switch-off tempera-
ture difference heat-
ing return increase
0 F T
P12
– 4 F 6 F When the switch-off tem-
perature difference is reached,
the heating return increase is
switched off.
Maximum tempera-
ture loading circuit
T
P15
+ 40 F 270 °F 212 °F The difference between P14
and the temperature of the
secondary side of the heat
exchanger controls the solar
circuit pump and the storage
tank loading pump.
1)
Minimum tempera-
ture loading circuit
32 °F T
P14
– 40 F 32 °F The storage tank loading
pump is only switched on
when the secondary side of
the heat exchanger is greater
than or equal to P15.
Loading strategy
storage tank 1
dIFF
2)
, AbS
3)
The loading strategy depends
on the storage tank system
used and the usage of the
system.
diff: highest efficiency. The
control target is the tem-
perature difference between
the collector and the storage
tank.
4)
AbS: Useful when the system
requires particular tempera-
tures, e.g. to avoid switching
on the external back-up heat-
ing system.
The control target is the tem-
perature of the collector.
4)
Control target of
differential tem-
perature loading
(dIFF)
4 F 100 F 16 F
Control target of
absolute tempera-
ture loading (AbS)
32 °F 200 °F 140 °F
Loading strategy
storage tank 2
dIFF
2)
, AbS
3)
Control target of
differential tem-
perature loading
(dIFF)
4 F 100 F 16 F
Control target of
absolute tempera-
ture loading (AbS)
32 °F 200 °F 140 °F