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Siemens Switzerland Ltd
User manual RVS61.843 CE1U2355en_02
HVAC Products 6 The settings in detail 23. November 2007
pump is shut down by a safety function (e.g. due to high-pressure, low-pressure, or hot-
gas temperature).
Internal requests, DHW requests and requests via bus are suppressed. No
consideration is given to minimum off time and minimum running time. The prerun and
overrun times of the condenser pump and source pump are taken into account. Normal
defrost is possible.
NC contact
The contact is normally closed and must be opened to activate the selected Hx
function.
NO contact
The contact is normally open and must be closed to activate the selected function Hx.
The descriptions given on the functions of contact Hx refer to the setting as NO contact.
If input H1, H2, H3 (5950, 6046, 5960) is used as a contact input (”Min flow temp setp”
or “Refrigeration request”), the controller uses the value set here as the setpoint.
The heat pump is controlled constantly at the temperature level set here, either until
contact Hx opens again or until a higher heating / cooling request is delivered.
If several requests for heating or cooling are received at the same time (contact Hx,
DHW or from the controller itself), the highest or lowest of them is automatically
selected.
Example of minimum flow temperature setpoint:
30 20 10 0 -10
40
30
60
50
80
70
TVw
TVw
2355Z20
TA
°C
°C
gem
0
TVHw
TVHw Minimum flow temperature setpoint
TVw Flow temperature setpoint
These settings can be made for each input Hx.
The linear characteristic is defined via 2 fixed points. The setting is made with 2
parameter pairs for
Function value and Voltage value (F1/U1 and F2/U2).
• Example for heat or refrigeration request 10 V
Type of contact Hx
Function value contact Hx
Voltage value 1
Function value 1
Voltage value 2
Function value 2
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