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Siemens Switzerland Ltd
User manual RVS61.843 CE1U2355en_02
HVAC Products 6 The settings in detail 23. November 2007
1st speed
output Q2/Q6/Q20
2nd speed
Output Q21/Q22/Q23
Pump state
Off Off Off
On Off Part load
On On Full load
Diverting valve, cooling Y21
Control of the diverting valve for cooling. This necessitates a 4-pipe system. The
diverting valve for cooling is required in the case of a commonly used heating and
cooling circuit for changeover from heating to cooling when the heat pump is used not
only for heating but also and
simultaneously for cooling.
Q2
HK/KK
T
B1
Y1/Y2
Y21
H
K
K
H
Example:
Draw off via 4-pipe system
Dehumidifier K29
An external dehumidifier can be enabled if the indoor air humidity rises. In this case, a
humidity sensor must be connected to input Hx.
The function of the dehumidifier depends on the cooling functions.
Operation of the dehumidifier is not affected by operating modes, holiday programs,
presence button, etc.
Heat request K27
Indicates to an external heat source when there is a request for heat by closing its
contact.
Refrig demand K28
As soon as there is refrigeration demand in cooling circuit 1, output K28 is activated.
This can be used to switch on an external refrigeration machine.
In the case of device with address 1, a refrigeration demand from the system also can
activate output K28. For this purpose, operating line 6627 "Refrig demand K28" on
menu "LPB system" must be set to "Centrally".
Alarm output K10
If a fault occurs in the controller or the system, one of the alarm relays delivers a signal.
The relevant contact makes with a delay of 10 minutes.
When the fault is corrected, that is, when the error message is no longer present, the
contact opens with no delay.
Time program 5 K13
The relay switches any connected component at the points in time set in time program
5 (601 – 616).
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