Release Of The Circulating Pump; Priority Of D.h.w. Heating - Siemens RVD110 Basic Documentation

Siemens Building Technologies
HVAC Products

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
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:
Setting Priority
Plant type no. 2...7:
0 Absolute Heating circuit locked,
heating circuit pump
OFF
1 Shifting Heating circuit reduced
when there is not suffi-
cient supply of heat
2 Shifting Heating circuit reduced
when there is not suffi-
cient supply of heat
3 Parallel Heating circuit main-
tains normal operation,
heating circuit pump
ON
4 Parallel Heating circuit main-
tains normal operation,
heating circuit pump
ON
Basic Documentation RVD110, RVD130
14 Function block D.h.w. heating
Mode of operation during d.h.w. heating
Plant type no. 8:
Heating circuit valve
CLOSED, heating
circuit pump ON
Heating circuit mixing
valve throttled when
there is not sufficient
supply of heat
Heating circuit mixing
valve throttled when
there is not sufficient
supply of heat
Heating circuit main-
tains normal opera-
tion, heating circuit
pump ON
Heating circuit main-
tains normal opera-
tion, heating circuit
pump ON
not lit), the circulating pump is
Flow temp. set-
point according to
D.h.w. demand
D.h.w. demand
Maximum selec-
tion from avail-
able demands
D.h.w. demand
Maximum selec-
tion from avail-
able demands
CE1P2381E
27.05.2004
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