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ANDREWS COMBIﬂ o

4.17.1 EXPLANATION OF CONFIGURATION MODES

None

Where there is no module ﬁ tted to the appliance, the parameter setting should be “none”. If this parameter is
conﬁ gured for example as “Multifunctional” and there is no module ﬁ tted, an error message will result.

Multifunctional

Deﬁ ning the module as “multifunctional” means that the module can be freely conﬁ gured to perform any
number of input and output control tasks required. It is possible to deﬁ ne the parameters of a heating circuit
and conﬁ gure the AGU2.5 as “multifunctional”, but if the module is deﬁ ned as e.g.“heating circuit one” then no
other parameter settings are required and this removes the possibility of an incorrect parameter being set. *

Heating Circuit One, two or three

The heating circuit will turn on the corresponding heating pump (QX23) in response to a demand for heating
from a Siemens room controller (such as a QAA55) or a wall thermostat using the H2 input. Here the input
H2 on the module can be conﬁ gured (parameter lines 6046, 6054 & 6062) as a “room thermostat”. A demand
received on input H2 will run the pump and will activate the heat engines (subject to other factors which may
hold oﬀ the heating demand).

If you want to control the temperature of a heating circuit with a mixing valve (e.g. under ﬂ oor heating) then
you have no choice but to deﬁ ne the AGU2.5 as a heating circuit. As soon as a 10K sensor is connected to
BX21, the appliance controls will detect its presence and activate the extra functions (QX21 & QX22). These
two outputs can be connected to a 230v (max 1A) 3-point control actuator to accurately control the tempera-
ture of the ﬂ ow around a heating circuit. *

There are ﬁ ve parameters relating to the mixer valve that can be set to match the system to the valve. De-
pending on the heating circuit being deﬁ ned, these parameters are in the ranges: 832 – 836, 1132 - 1136 and
1432 – 1436. *

SOLAR DHW

A module can be conﬁ gured as a dedicated Solar collector system for DHW. Here Q5 is the collector pump,
B6 is the collector temperature sensor and B31 is the DHW tank temperature sensor. Parameters (such as
charging priority, dealing with excess heat, collector start temp, pump overrun, frost protection, energy yield
etc) may need to be conﬁ gured to suit the installed application. *

PRIMARY CONTROLLER

A module can be conﬁ gured to operate a Primary controller / System pump. It operates in the same way as the
“heating circuit” setting. There are options to deﬁ ne parameters for the type of mixer valve being used (2 or 3
position), diﬀ erential, opening time, proportional band, action time delay and also whether the valve is located
before or after any buﬀ er storage tank.

If no temperature sensor is ﬁ tted to BX21 then the primary controller will just operate the primary pump at
every instance of heat demand from any heat source. Once a sensor is installed the extra function of being
able to control a mixer valve will become activated and the parameters 2110 to 2150 need to be conﬁ gured to
match the system being operated. The operation of the primary pump with each heating circuit and DHW will
need to be determined by setting parameters 872, 1172, 1472 or 1880. *

Please see separate ‘CONTROLS PROGRAMMING GUIDE’ guide supplied with heater for

further details on how to conﬁ gure these modes