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Siemens Switzerland Ltd
User manual RVS61.843 CE1U2355en_02
HVAC Products 6 The settings in detail 23. November 2007
Output relay QX
The use of relay outputs 1 to 6 can be individually defined.
Line no. Operating line
5890
5891
5892
5894
5895
5896
Relay output QX1, QX2, QX3, QX4, QX5, QX6
None
Compressor stage 2 K2
Process reversing valve Y22
Hot-gas temp K31
El imm heater 1 flow K25
El imm heater 2 flow K26
Diverting valve cool strat2 Y28
System pump Q14
Cascade pump Q25
Heat gen shutoff valve Y4
El imm heater DHW K6
Circulating pump Q4
St tank transfer pump Q11
DHW interm circ pump Q33
DHW mixing pump Q35
Collector pump Q5
Collector pump 2 Q16
Solar pump ext exch K9
Solar ctrl elem buffer K8
Solar ctrl elem swi pool K18
El imm heater buffer K16
H1 pump Q15
H2 pump Q18
H3 pump Q19
Heizkreispumpe HkP Q20
2. 2nd pump speed HC1 Q21
2. 2nd pump speed HC2 Q22
2. 2nd pump speed HCP Q23
Diverting valve, cooling Y21
Dehumidifier K29
Heat request K27
Refrig demand K28
Alarm output K10
Time program 5 K13
Depending on the selection made, setting of the relay outputs assigns appropriate extra
functions to the basic diagrams. For detailed information, refer to section “Application
diagrams“.
None
The relay output cannot be assigned any function. The relay is inactive.
Compressor stage 2 K2
Relay is used for the control of a second compressor (refer to compressor 2)
Process reversing valve Y22
Control of process reversing valve Y22. The process reversing valve is required for
changeover from heating to cooling mode and for the heat pump’s defrost function.
Hot-gas temp K31
The relay is energized when a connected hot-gas temperature sensor B81 or B82
exceeds “Setpoint hot-gas temp” (2849), and deenergized, when the temperature drops
by the switching differential (2850) below the setpoint. The type of contact (2851) can
be selected.
El imm heater flow K25
The relay is used for the control of an electric immersion heater in the flow (K25) or, in
the case of a 2-stage electric immersion heater, for control of the first stage.
Relay outputs QX1 – QX6
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