Potterton eurocondense four 125 kw, Installation, Operation And Maintanance Manual, Page: 112 / 148

Solar flow sensor B63: This sensor is required for the solar usage meas­
urement.
Solar return sensor B64: This sensor is required for the solar usage
measurement.
Function input H1 (5950) Function input H4 (5970) and
Function input H5 (5977)
None: No function.
Optg mode change CHs+HW: Changeover of the operating modes of
the heating circuits to reduced or protection operation (prog.nos. 900,
1200, 1500) and locking of domestic hot water charging in case of
closed contact at H1/H4/H5/H2.
Optg mode changeover CH1 up to Optg mode changeover CH3: Oper­
ating mode changeover for heating circuits to protection or reduced op­
eration.
Note
Locking of domestic hot water charging is only possible under the
setting Optg mode change CHs+HW.
Heat generation lock: Locking of the boiler in case of closed contact at
H1/H4/H5/H2.
Error/alarm message: Closing the inputs H1/H2 gives a control unit-in­
ternal fault message, which will also be signalled via a relay output, pro­
grammed as an alarm output or in the remote management system.
Consumer request VK1/Consumer request VK2: The set flow tempera­
ture setpoint is activated via the connecting terminals (e.g. a ventilation
heater function for door curtain units).
Note
The setpoint is set under prog.no. 1859/1909.
Excess heat discharge: Active excess heat discharge enables, for ex­
ample, an external source to force consumers (heating circuit, DHW
storage tank, Hx pump) to draw off excess heat with a signal. For each
consumer the parameter excess temperature discharge can be set to
determine whether the forced signal is taken into account and should
therefore take part in the heat discharge or not.
Release swi pool solar: This function enables the solar swimming pool
heater to be released externally (e.g. via a manual switch) or the solar
charging priority to be specified as compared to the storage.
Optg mode change CHs+HW: The operating level can be set via the
contact instead of via the internal time switching program (external time
switching program)
Room thermostat CH1 up to Room thermostat CH3: With the input a
room thermostat request can be generated for the set heating circuit.
Note
The quick decrease should be switched off for the corresponding
heating circuits.
Hot water thermostat: Connection of the DHW thermostat.
Pulse count: By querying the input the low frequency pulse, e.g. for flow
measurement is recorded.
Checkb sign flue gas damper: Feedback via input H1 in case of activa­
ted flue gas damper control.
Start prevention: With this input a burner start can be prevented.
Consumer request VK1 10V/Consumer request VK2 10V: The applica­
tion node external load x receives a voltage signal (DC 0-10 V) as heat
request. The linear curve is defined via two fix points (voltage value 1/
function value 1 and voltage value 2/function value 2 (only applies to
H1).
Preselected output 10V: The generator receives a voltage signal (DC 0 -
10 V) as output request. The linear curve is defined via two fix points
(voltage value 1/function value 1 and voltage value 2 / function value 2
(only applies to H1).
9 Settings
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