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Siemens Switzerland Ltd
User manual RVS61.843 CE1U2355en_02
HVAC Products 6 The settings in detail 23. November 2007
Minimum flow temp setpoint
Consumers requiring a minimum flow temperature can request it via contact Hx (e.g. air
heating coil for air curtain).
When the contact closes, the temperature setpoint adjusted on operating line 5952 /
5962 is demanded.
Heat request 10V
Heat generation receives heat requests in the form of voltage signals (DC 0...10 V).
The associated setpoint is calculated on the basis of the straight line defined with
operating lines 5952 – 5956 (for H1), or 5962 – 5966 (for H3).
Dewpoint monitor
To detect the formation of condensation in the cooling circuit, a dewpoint monitor can
be connected to input Hx.
If the dewpoint monitor trips, the cooling circuit is immediately switched off.
The cooling is enabled again when the dewpoint monitor reverts to normal and an
adjustable locking time (946) has elapsed.
Flow temp setp inc hygro
To prevent the formation of condensation due to high indoor air humidity, a hygrostat
can be connected to input Hx.
If the hygrostat trips, the flow temperature setpoint is increased by the fixed value of
"Flow temp setp incr hygro" (947). As soon as the hygrostat reverts to normal, the flow
temperature setpoint returns to the "normal value".
Refrigeration request
If the connected contact closes, the controller drives the heat pump to the fixed
temperature setpoint adjusted on operating line 5952 (for H1), 6048 (for H2), or 5962
(for H3). If the refrigeration request made is lower, consideration is given to it.
Refrig request 10V
Refrigeration generation receives the refrigeration request in the form of voltage signals
(DC 0...10 V).
The respective setpoint in °C is determined via the linear characteristic which is defined
by 2 fixed points (voltage value 1 / function value 1, and voltage value 2 / function value
2).
Pressure measurement 10V
The controller receives the pressure signal in the form of voltage signals (DC 0...10 V).
The respective pressure value is calculated via the linear characteristic which is defined
by 2 fixed points (voltage value 1 / function value 1 and voltage value 2 / function value
2).
If the pressure value crosses one of the set limit values, an error or maintenance
message is delivered. If the value falls below the critical pressure limit, the heat pump is
shut down.
The values of the maximum, minimum and critical water pressure for H1 can be set
under 6140 OEM...6142 OEM, foür H2 under 6150 OEM…6152 OEM, and for H3
under 6180 OEM…6182 OEM
Rel room humidity 10V
The controller receives the relative humidity signal in the form of voltage signals (DC
0...10 V).
The respective room humidity is calculated via the linear characteristic which is defined
by 2 fixed points (voltage value 1 / function value 1 and voltage value 2 / function value
2).
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