Potterton eurocondense four 125 kw Installation, Operation And Maintanance Manual page 121

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Swimming pool pump Q19: Connection of a swimming pool pump at the
input Q19.
Flue gas relay K17: Relay K17 closes if the flue gas temperature ex­
ceeds the value set in the control line of prog. no. 7053.
St tank transfer pump Q11: The DHW storage tank can be charged from
the buffer storage tank providing it is hot enough. This transfer is
brought about by transfer pump Q11.
Hot water mixing pump Q35: Separate pump for cylinder content circula­
tion whilst pasteurisation is active.
HW interm circ pump Q33: Charging pump for DHW cylinder with exter­
nal heat exchanger.
Heat request K27: Output K27 is activated as soon as a heat demand
exists in the system.
Heating circuit pump HC1/HC2: The relay is used for actuating the heat­
ing circuit pump Q2/Q6.
Hot water ctrl elem Q3: Depending on the hydraulics a connected DHW
charging pump or diverting valve.
Overheating protection K11: The relay switches the heating circuit pump
on and off to protection the pump heating circuit from overheating.
Sensor input BX21 module 1 (7307), Sensor input BX22
module 1 (7308), Sensor input BX21 module 2, (7382), Sensor
input BX22 module 2 (7383), Sensor input BX21 module 3 (7457)
and Sensor input BX22 module 3 (7458)
Functions in addition to the basic functions are made possible by configur­
ing the sensor inputs.
None: Sensor inputs deactivated.
Hot water sensor B31: Second DHW sensor, which is used for full
charging of the legionella function (pasteurisation).
Collector sensor B6: First solar collector sensor in a collector field.
HW circulation sensor B39: Sensor for DHW circulation return.
Buffer sensor B4: Lower buffer storage tank sensor.
Buffer sensor B41: Centre buffer storage tank sensor.
Common flow sensor B10: Common flow sensor for boiler cascades.
Solid fuel boiler sensor B22: Sensor for the acquisition of the tempera­
ture of a solid fuel boiler.
HW charging sensor B36: DHW sensor for DHW charging systems.
Buffer sensor B42: Upper buffer storage tank sensor.
Common return sensor B73: Return sensor for the return diversion func­
tion.
Cascade return sensor B70: Common return sensor for boiler cascades.
Swimming pool sensor B13: Sensor for measurement of swimming pool
temperature.
Solar flow sensor B63: This sensor is required for the solar usage meas­
urement.
Solar return sensor B64Solar return sensor B64: this sensor is required
for the solar usage measurement
Function input H2 module 1 (7311), Function input H21 module
1 (7321), Function input H2 module 2 (7386), Function input H21
module 2 (7396), Function input H2 module 3 (7461) and Function
input H21 module 3 (7471)
Noneno 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 H21/H22/H2.
Operating mode changeover HC1 to HC3: Operating mode changeover
for heating circuits to protection or reduced operation.
Note
Locking of domestic hot water charging is only possible under the
setting Optg mode change CHs+HW.
Heat generation lock: the heat generator is locked through connecting
terminal H2. All temperature demands for heating circuits and DHW are
ignored. The boiler frost protection function is maintained.
9 Settings
121