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Siemens Building Technologies Basic Documentation RVD110, RVD130 CE1P2381E
HVAC Products 14 Function block D.h.w. heating 27.05.2004
14.3.3 Release of the circulating pump
This function controls circulating pump Q7.
Operation of the circulating pump prevents the d.h.w. piping system from cooling down.
Operation of the pump depends on the type of plant:
• Plant type no. 1 has no circulating pump
• With plant type no. 4, the circulating pump runs according to the release given
• With plant types no. 2, 3, 6 and 8, the circulating pump remains switched off during
d.h.w. heating
For the release, there are 3 choices available:
Setting Release
0 The circulating pump is always released (24 h/day)
1 Release takes place according to the d.h.w. program entered on operat-
ing lines 17 through 23
2 Release takes place according to the heating circuit program entered on
operating lines 6 through 12
• With plant type no. 7, control output Q7 is used for the charging pump. Its function
depends on the release of d.h.w. heating. Its separately adjustable overrun time (op-
erating line 108) is longer than that of charging pump Q3.
If a circulating pump is used, it must be controlled externally (Q8)
• If d.h.w. heating is switched off (standby, button
not lit), the circulating pump is
deactivated with every type of plant
• If the controller is in manual operation, the output is switched on and the circulating
pump runs
14.3.4 Priority of d.h.w. heating
To ensure quick d.h.w. heating, the other heat consumers can be restricted during
d.h.w. heating (priority). The controller affords absolute, shifting and no priority (parallel
operation). The choice is to be entered on operating line 106.
The individual types of priority act as follows:
Mode of operation during d.h.w. heating
Setting Priority
Plant type no. 2...7: Plant type no. 8:
Flow temp. set-
point according to
0 Absolute Heating circuit locked,
heating circuit pump
OFF
Heating circuit valve
CLOSED, heating
circuit pump ON
D.h.w. demand
1 Shifting Heating circuit reduced
when there is not suffi-
cient supply of heat
Heating circuit mixing
valve throttled when
there is not sufficient
supply of heat
D.h.w. demand
2 Shifting Heating circuit reduced
when there is not suffi-
cient supply of heat
Heating circuit mixing
valve throttled when
there is not sufficient
supply of heat
Maximum selec-
tion from avail-
able demands
3 Parallel Heating circuit main-
tains normal operation,
heating circuit pump
ON
Heating circuit main-
tains normal opera-
tion, heating circuit
pump ON
D.h.w. demand
4 Parallel Heating circuit main-
tains normal operation,
heating circuit pump
ON
Heating circuit main-
tains normal opera-
tion, heating circuit
pump ON
Maximum selec-
tion from avail-
able demands
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