Agu2.5 Expansion Modules - Potterton iHE 100 Installation & Servicing Instructions Manual

2.21 AGU2.5 EXPANSION MODULES

Defi ning the purpose of an AGU2.5 (parameter lines 6020 – 6022) through the HMI as anything other than "none"
or "multifunctional" will result in the inputs / outputs being fi xed as according to the following table:
CONFIGURATION OF
AGU2.5 MODULE (pa-
rameters 6020 - 6022)
0. None
1. Multifunctional
2. Heating circuit one
3. Heating circuit two
4. Heating circuit three
5. Solar DHW
6. Primary controller
* Can be freely confi gured (see previous page for H2 thermostat setup)
EXPLANATION OF CONFIGURATION TYPES
N
ONE
Where there is no AGU2.5 module fi tted to the boiler,
the parameter setting should be "none". If this param-
eter is confi gured for example as "Solar DHW" and there
is no module fi tted, an error message will result.
M
ULTIFUCTIONAL
Defi ning the AGU2.5 as "multifuctional" means that the
expansion 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 "heating circuit one then
no other parameter settings are required and this takes
away the possibility of an incorrect parameter being
set.
H C O ,
EATING IRCUIT NE TWO OR THREE
The heating circuit will turn on the corresponding heat-
ing pump (QX23) in response to a demand for heating
from a Siemens room controller (such as a QAA55) or a
wall thermostat using H2 input. Here the input H2 on
the AGU2.5 can be confi gured (parameter lines 6046,
6054 & 6062) as a "room thermostat". A demand
received on input H2 will run the pump and activate the
boiler (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. underfl 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 LMS14 controls will detect it and activate
the extra functions (QX21 & QX22). These two outputs
can be connected to a 230v (max 1A) 3-point control
iHE
QX21 (230v QX22 (230v
output) output)
* *
Y1 (open Y2 (close mixer
mixer valve) valve)
Y5 (open Y6 (close mixer
mixer valve) valve)
Y11 (open Y12 (close mixer
mixer valve) valve)
* *
Y19 (open Y20 (close mixer
mixer valve) valve)
QX23 (230v BX21 (Ana-
output) logue input)
* *
Q2 (pump) B1 (fl ow sen-
sor)
Q6 (pump) B12 (fl ow sen-
sor)
Q20 (pump) B14 (fl ow sen-
sor)
Q5 (pump) B6 (Collector
sensor)
Q14 (pump) B15 (fl ow sen-
sor)
actuator to accurately control the temperature of the
fl ow around this heating circuit.
There are fi ve parameters relating to the mixer valve
that can be set to match the system to the valve. These
parameters are in the ranges: 832 – 836, 1132 - 1136
and 1432 – 1436.
S DHW
OLAR
The AGU2.5 can be confi gured as a dedicated Solar col-
lector 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 ap-
plication.
P
RIMARY CONTROLLER
The AGU2.5 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 de-
fi 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. 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 sys-
tem being operated.
The operation of the primary pump with each heating
circuit and DHW can be determined by setting param-
eters 872, 1172, 1472 or 1880
28
BX22 H2
(Analogue (digital
input) input)
* *
* *
* *
* *
B31 (DHW *
tank sensor)
* *
GB/IE