3
System
Systems Anl 1.x have two heat exchangers, where as system Anl 2.x have three heat
exchangers.
The controller is used to control the sequence of one system with two or three heat exchangers.
The heat exchangers run, depending on the configuration, in parallel, in direct sequence or with
automatic lag/lead sequence change (based on time, outdoor temperature or capacity). In
weather-compensated control, an outdoor sensor (AF) is additionally required. All heat
exchangers have a return flow sensor (RüF) on the primary side for return flow temperature limi-
tation as well as a flow sensor (VF) on the secondary side. The control is based on cascade con-
trol. In this case, each heat exchanger uses its own flow sensor VF1, VF2 or VF3 for control. The
set point is determined by the overall flow sensor VFg. Depending on the heat exchanger, a con-
trol valve (continuous or three-step), a circulation pump (Pu) and a shut-off valve (Kl) are in-
cluded in the control. Heat exchangers that are not in operation are shut off hydraulically by the
shut-off valve (Kl1, Kl2 or Kl3). As soon as a heat exchanger starts running after the time in
Min.
deactivation time
has elapsed, the shut-off valve opens. After the time in
Shut-off valve transit
time
has elapsed, the corresponding circulation pump (Pu1, Pu2 or Pu3) starts running, the con-
trol valve is opened and closed-loop control is activated.
If a heat exchanger stops running after the time in
Min. activation time
has elapsed, the shut-off
valve first closes after the control valve closes and after the time in
Pump lag time
elapses. The
shut-off valves are controlled using a continuous OPEN or CLOSE signal.
Note:
The pump lag time is immediately ended when the supply flow falls below the limit.
2
[Übersicht > Parameter > Wärmetauscher 1…3]
Parameters
WE
Adjustment range
Einschaltzeit min
(min. activation time)
0 min
0 to
90 min
Ausschaltzeit min
(min. deactivation time)
0 min
0 to
90 min
Klappenlaufzeit
(shut-off valve transit time)
3 min
0 to 300 min
EB 5571-2 EN
21
System
