27
(F2)
F4
A2/A3
F1
A1
(F3)
A3
(
)
Impulse
Impulse
Fig. 2.15
System 7
Outputs:
A1
Collector pump (speed control)
A2 Additional relay, freely programmable
function
A3 Additional relay, freely programmable
function
Inputs:
F1
Collector 1 temperature probe
F4
Temperature probe at bottom of stor-
age cylinder 1 and A1 max. deactiva-
tion temp. (when F3 not fitted)
F3
(optional) Temperature probe at top
of storage cylinder 1 / A1 max. temp.
monitoring and reference probe during
the heating
F2
(optional) Collector return tempera-
ture to measure heat production or
temperature at bottom of storage cyl-
inder 2
F5
(optional) Temperature probe at top of
storage cylinder 2 / reference probe
during heating of storage cylinder 2
(cascading) or reference probe for
return temperature control
Impulse (optional) pulse transducer for volu-
metric flow meter or circulating pump
controlled by impulses
Switching conditions for A1
Heat production (difference between storage
cylinder and min. temp.)
ON: F1 - F4 > P30
and F1 > P40
OFF: F1 - F4 < P31
or F1 < P41
Maximum storage cylinder temperature
OFF:
F3 (or F4) > P50
ON again:
F3 (or F4) < P50 - 5°C
Maximum collector temperature
OFF: F1 > P42
ON: F1 < P42 - 10°C
