Switching The D.h.w. Heating Off; Heating With A Storage Tank; General; Regulating Unit - Siemens RVD110 Basic Documentation

Siemens Building Technologies
HVAC Products

14.3.7 Switching the d.h.w. heating off

The d.h.w. functions can be deactivated by pressing the button for "D.h.w. heating ON /
OFF" (LED in the button not lit). Frost protection for the d.h.w. remains active and the
d.h.w. pump(s) is (are) switched off. Manual d.h.w. heating will be completed, however.
14.4 D.h.w. heating with a storage tank

14.4.1 General

D.h.w. heating with a storage tank is covered by plant types no. 2, 3 and 6b (refer to
section 14.5 "Plant type no. 6b"), and 8.
The controller supports 3 types of plant (2, 3 and 8) where the heating circuit and d.h.w.
heating use one common heat exchanger. The heating circuit is a pump or mixing
circuit.
With plant types no. 2 and 3, either the RVD110 or RVD130 can be used. The RVD130
can also control the circulating pump.

14.4.2 Regulating unit

For d.h.w. heating, it is possible to use a charging pump (plant type no. 2) or a diverting
valve (plant type no. 3). When using a diverting valve, the d.h.w. priority is always abso-
lute because it is dictated by the diverting valve. Only the RVD130 has a relay output
for controlling the circulating pump.

14.4.3 Manual d.h.w. heating

Manual d.h.w. heating is activated by pressing the operating mode button
heating for 3 seconds. D.h.w. heating is also switched on if
• d.h.w. heating is not released
• the d.h.w. temperature lies within the switching differential (also refer to forced
charging)
• the d.h.w. operating mode is on standby (holiday period, d.h.w. heating OFF)
Operating mode "D.h.w. heating ON" is switched on by activating manual d.h.w. heat-
ing. As an acknowledgement, the LED in the operating mode button flashes for 3 sec-
onds. Manual d.h.w. heating cannot be interrupted.
If the legionella function is active, it will be aborted when the operating mode button
is pressed (also refer to chapter 15 "Function block Extra legionella functions").
This function is only available with plant types no. 2, 3, and 6 through 8.

14.4.4 Legionella function

Potential legionella viruses in the d.h.w. storage tank are killed by periodically raising
the d.h.w. temperature to a higher level.
The legionella function can be activated (operating line 104):
• Once a week (also selecting the weekday: entry 1 = Monday, 2 = Tuesday, etc.)
• Once a day (entry 1-7)
• Never (deactivated: entry ---)
On the selected day, the d.h.w. is heated up to the adjusted legionella setpoint at the
beginning of the first release period.
If, with the weekly legionella function, the setpoint will not be reached at the end of the
maximum heating time (maximum duration of d.h.w. heating, input on operating line
109), the legionella function will be aborted and repeated the next day until successfully
completed.
Basic Documentation RVD110, RVD130
14 Function block D.h.w. heating
for d.h.w.
49/94
CE1P2381E
27.05.2004