IVT Rego 5101 Installation Manual page 17

reaches the value set in Delay (60 °min) stage 3 is
activated.
Disconnection: Stage 3 is disconnected when the degree
minute calculation for the difference between E11.T1
actual value and E11.T1 set point value reaches the set
Delay (5 °min). The same applies to stage 2. Stage 1 is
disconnected when the degree minute calculation
reaches the set Delay (10 °min).
The additional heat demand ceases when all stages are
disconnected.
When the internal additional heat is activated the max
limit for T8 is increased to 75 °C. The limit is reset to
65 °C when the additional heat is disconnected.
4.4.2 Modulated add. heat E71
The external additional heat is controlled with 0-10V and
regulated using a PID regulator to maintain the E11.T1
set point value.
A degree minute calculation is used for connection/
disconnection.
Connection: E11.T1 does not reach its set point value.
Calculation of difference between E11.T1 set point
value – set Hysteresis (3 K) and E11.T1 actual value are
added continuously. When the sum reaches the value set
in Delay (180 °min) the additional heat is activated.
The output signal from the PID regulator controls how
much additional heat shall be produced.
Disconnection: The additional heat is disconnected
when the degree minute calculation for the difference
between E11.T1 actual value and E11.T1 set point value
reaches the set Delay (10 °min). The calculation starts
when the output signal from the PID regulator is 0.
4.4.3 Mixed add. heat E71
The external additional heat Q71 mixing valve is
controlled with 0-10V and regulated using a PID
regulator to maintain the E11.T1 set point value.
A degree minute calculation is used for connection/
disconnection.
Connection: E11.T1 does not reach its set point value.
Calculation of difference between E11.T1 set point
value – set Hysteresis (3 K) and E11.T1 actual value are
added continuously. When the sum reaches the value set
in Delay (180 °min) the additional heat is activated.
The additional heat and any internal circulation starts.
When the thermostat E71.E1.P111 acknowledges that
the additional heat has reached its operating
temperature mixing commences.
The output signal from the PID regulator controls how
much additional heat shall be produced.
6 720 645 172 (2010/07) en
Disconnection: The additional heat is disconnected
when the degree minute calculation for the difference
between E11.T1 actual value and E11.T1 set point value
reaches the set Delay (10 °min). The calculation starts
when the output signal from the PID regulator is 0.
4.4.4 District heating E51
Differential pressure switch E51.B11 at the district
heating heat exchanger must indicate the correct
direction of flow to permit opening of mixing valve Q51.
Q51 is controlled with 0-10V and regulated using a PID
regulator to maintain the E11.T1 set point value.
A degree minute calculation is used for connection/
disconnection.
Connection: E11.T1 does not reach its set point value.
Calculation of difference between E11.T1 set point
value – set Hysteresis (3 K) and E11.T1 actual value are
added continuously. When the sum reaches the value set
in Delay (180 °min) the additional heat is activated.
The output signal from the PID regulator controls how
much additional heat shall be produced.
Disconnection: The additional heat is disconnected
when the degree minute calculation for the difference
between E11.T1 actual value and E11.T1 set point value
reaches the set Delay (10 °min). The calculation starts
when the output signal from the PID regulator is 0.
4.4.5 Additional heat alarm
On alarm from the additional heat all degree minute
calculations are reset.
4.4.6 Additional heat operation
Normally Comp. + add. heat applies. When Only
additional heat is set the additional heat is activated
instead of the compressor during a heat demand.
In Internal add. heat the additional heat is also activated
during a hot water demand.
4.4.7 Hysteresis E11.T1
When an additional heat demand exists the hysteresis
for E11.T1 is held at its maximum.
4.4.8 PID regulator
P factor regulation is used.
Settings
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