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Siemens Switzerland Ltd
User manual RVS61.843 CE1U2355en_02
HVAC Products 6 The settings in detail 23. November 2007
El imm heater flow K26
The relay is used for the control of the second stage of an electric immersion heater in
the flow (K26).
Diverting valve cool strat2 Y28
Control of optional diverting valve cooling Y28 for changeover to passive cooling. In the
case of simultaneous heating mode, this ensures hydraulic disconnection of the heating
circuit from the cooling circuit.
System pump Q14
The connected pump serves as a system pump for supplying heat to other consumers.
The system pump is put into operation as soon as one of consumers calls for heat. If
there is no heat request, the pump will be deactivated followed by overrun.
Cascade pump Q25
Gemeinsame Pumpe für alle Wärmeerzeuger einer Kaskade.
Heat gen shutoff valve Y4
If the buffer storage tank holds a sufficient amount of heat, the consumers can draw
their heat from it, and the heat sources need not be put into operation.
Automatic heat generation lock locks the heat sources and hydraulically disconnects
them from the rest of the plant with the help of shutoff valve Y4.
This means that the heat consumers draw energy from the buffer storage tank and
wrong circulation through the heat sources is prevented.
El imm heater DHW K6
Using the connected electric immersion heater, the DHW can be charged according to
operating lines “El imm heater optg mode” (5660) and “El immersion heater release”
(5061).
The electric immersion heater must be fitted with a safety limit thermostat!
“El imm heater optg mode” must be appropriately set.
Circulating pump Q4
The connected pump serves as a DHW circulating pump.
The time schedule for the circulating pump can be set on operating line “Circulating
pump release” (1660). “Circulating pump cycling” can be set on operating line 1661,
“Circulation setpoint” on operating line 1663.
.
St tank transfer pump Q11
If the temperature level of the buffer storage tank is high enough, the DHW storage
tank can be charged by the buffer. This transfer can be made by means of transfer
pump Q11.
DHW interm circ pump Q33
Charging pump with DHW storage tank using an external heat exchanger.
DHW mixing pump Q35
Separate pump for storage tank circulation during the time the legionella function is
active.
Collector pump Q5
For control of the collector pump.
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