Siemens RVS41.813 User Manual page 181

Function input Hx
Siemens Switzerland Ltd
HVAC Products
The settings for input H2 are made on operating lines 6046 – 6052.
Operating mode changeover
• Heating circuits
The operating mode of the respective heating circuit(s) is switched to Protection via
terminal Hx (e.g. by means of a remote telephone switch).
• DHW
DHW heating is locked only when using setting 1 (HCs+DHW) All temperature
requests made by the heating circuits and by DHW are ignored. Frost protection is
maintained.
Error / alarm message
When input H1 closes, a controller-internal error message is triggered.
If the alarm output (relay outputs QX1 – 6, 5890 – 5896) is appropriately configured, the
error is forwarded or indicated by closing an additional contact (by an external lamp or
horn).
Minimum flow temp setpoint
Consumers requiring a minimum flow temperature can request it via contact Hx (e.g. air
heating coil for warm 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 5953 – 5956 (for H1), or 5963 – 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 temperature setpoint increase 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.
Refrigeration 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
User manual RVS61.843, RVS41.813
6 The settings in detail
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CE1U2355en_02
28. September 2009