andrews COMBIflo 100/300 User manual

M6499 DRAFT
CONTROLS PROGRAMMING GUIDE
COMBIflo
Indirect High Efficiency Boiler & Stainless Steel Storage Water Heater
Indirect High Efficiency Boiler & Stainless Steel Storage Water Heater
100/300
150/300
is manual must be kept with the appliance
M7888 Rev A

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TABLE OF CONTENTS
Subject Page
General
Time of day and date setting ..................................................................................................... 4
Room unit operator section ........................................................................................................ 5
Time programs and holidays ...................................................................................................... 6
Heat Circuits
Operating modes ............................................................................................................................. 7
Temperature setpoint & heating curve .................................................................................. 8
Eco function & 24 hour heating limitation ........................................................................... 10
Flow setpoint, weather compensation & room influence ............................................. 11
Room temperature control, limitation, boost heating & quick setback ................... 12
Optimum start/stop control ........................................................................................................ 13
Raising the reduced setpoint & overtemperature protection ...................................... 13
Mixing valve control ...................................................................................................................... 14
Floor curing function .................................................................................................................... 15
Excess heat draw ........................................................................................................................... 16
Operating level / operating mode changeover ................................................................... 17
DHW
Operating modes & setpoint ...................................................................................................... 18
Release of DHW & Charging priority ....................................................................................... 19
Legionella function ........................................................................................................................ 20
Circulation pump & remote enable ........................................................................................... 21
Consumer circuits .......................................................................................................................... 22
Swimming pool ................................................................................................................................ 23
Primary system pump
Limitation of flow temperature ................................................................................................... 24
Mixing valve control & primary control/system pump ........................................................ 25
Boiler control and min/max setpoints ................................................................. 26
DHW Storage tank
Charging, time and temperature limitations ........................................................................... 27
Electric immersion heater mode .................................................................................................. 28
Automatic push function ................................................................................................................ 29
Configuration
Switching heat circuits on/off....................................................................................................... 30
Solar controlling .................................................................................................................................... 31
AGU2.5 230v Outputs ...................................................................................................................... 32
AGU2.5 sensor inputs ....................................................................................................................... 34
AGU2.5 H2 input setup ................................................................................................................... 35
Collector sensor, building constant & central setpoint compensation ......................... 37
Frost protectio, saving sensors & restoring default settings .......................................... 38
LPB System ......................................................................................................................................... 39
Fault, service and special operations
Alarms, history and maintainance information ...................................................................... 41
Chimney sweep and manual control functions ...................................................................... 42
Controller stop and parameter sticks ......................................................................................... 43
Input / output test ............................................................................................................................. 44
Diagnostic cascade, heat generators and consumers ........................................................ 45
Burner control ............................................................................................................................. 46

4
Andrews COMBIflo Controls programming guide
Menu: time of day and date
Time of day and date
The controller has a yearly clock with
time of day, weekday and date. To en-
sure the controller´s functionality, both
the time of day and the date must be
correctly set.
.
Summer- / wintertime changeover
The dates set for the changeover from
wintertime to summertime, and vice
versa, ensure that on the first Sunday
after the set date the time of day will
change from 02:00 (wintertime) to
03:00 (summertime), and from 03:00
(summertime) to 02:00 (wintertime).
Line no. Operating line
1 Hours / minutes
2 Day / month
3 Year
5 Start of summer time
6 End of summer time
Factory setting
25.03.
25.10.

5Controls programming guideAndrews COMBIflo
Menu: Operator section
Operation and display
Language
Available languages vary depending on
country and version.
Line no. Operating line Factory setting
20 Language English
22 Info
Temporarily
Permanently
Temporarily
26 Operation lock OFF
27 Programming lock OFF
28 Direct adjustment Storage with confirmation
44 Operation HC2
Jointly with HC1
Independently
Jointly with HC1
46 Operation HC3/P
Jointly with HC1
Independently
Jointly with HC1
70 Software Version Indication only
Info
Temporarily:
After pressing the Info-button the Info
display will appear. After 8 min. the
basic display will reappear.
Permanently:
After activation the Info display will be
shown permanently.
Operation lock
When operation lock is activated, the
following operating elements can no
longer be adjusted:
-Heating circuit operating mode
-DHW operating mode
-Room comfort setpoint (setting knob)
-Presence button
Programming lock
When programming lock is activated,
parameter values can still be displayed,
but can no longer be changed.
-Temporary deactivation of the
programming lock
Within the programming level, the
programming lock can temporarily be
overriden. To do this, press the OK
and ESC buttons simultaneously for 3
seconds. Temporary deactivation of
the programming lock is maintained
until programming is quit.
-Constant deactivation of
programming lock
First, make the temporary deactivati-
on, then go to operating line 27 Pro-
gramming lock and deactivate the
programming lock.
Direct adjustment
Automatic storage:
Altered values are stored without
confirming with the OK-button.
Storage with confirmation:
Altered values are only stored after
confirmation with the OK-button.
Operation HC2
Depending on operation line 40, the
action of operation (operating mode
button or rotary knob) on room unit 1,
on the operator unit or service unit can
be defined for HC2.
Jointly with HC1:
Operation acts commonly on HC1
and 2.
Independently:
The action of operation is queried on
the display as soon as the operating
mode button is pressed or the rotary
knob is operated.
Bedienung HK P
Depending on operation line 40, the
action of operation (operating mode
button or rotary knob) on room unit 1,
on the operator unit or service unit can
be defined for HC3/P.
Jointly with HC1:
Operation acts commonly on HC1
and 2.
Independently:
The action of operation is queried on
the display as soon as the operating
mode button is pressed or the rotary
knob is operated
Software version
The display shows the current versi-
on of the operator/room unit.

6
Andrews COMBIflo Controls programming guide
Menu: Time programs
Menu: Holiday
For the heating circuits and for DHW
heating, a number of switching pro-
grams are available. They are activated
in Automatic operation and control the
change of the temperature levels (and
the associated setpoints) via the selec-
ted switching times.
Entering the switching times
The switching times can be set in a
combined way, that is, either jointly
for several days or in the form of se-
parate times for individual days.
When preselecting groups of days
like for instance Mo…Fr and Sa…Su
that use the same switching times,
the setting of switching programs is
simplified.
Switching points
Standard program
Line no. Operating line Factory setting
HC1 HC2 3/HC3 4/DHW 5
500 520 540 560 600 Preselection
Mo - Su
Mo - Fr
Sa - Su
Mo - Su
Mo - Su
501 521 541 561 601 1. phase on 6 : 00
502 522 542 562 602 1. phase off 22 : 00
503 523 543 563 603 2. phase on - - : - -
504 524 544 564 604 2. phase off - - : - -
505 525 545 565 605 3. phase on - - : - -
506 526 546 566 606 3. phase off - - : - -
All time programs can be reset to
their default setting. Each time pro-
gram hat its own operating line to
make this reset. Note: In that case, individual setting
will be lost!
Holiday Line no. Operating line Factory setting
HC1 HC2
642 652 start - - : - -
643 653 end - - : - -
648 658 Operating level
Frost protection
Reduced
Frost protection
641 651 Preselection
Period 1, 2, 3, 4, 5, 6, 7, 8
period 1
The holiday program allows switching
the operating level of the HCs accor-
ding to date. On the last day heating
is still deactivated. On the following
day heating to comfort setpoint will
commence according to the time
program.
The holiday program can only be used
in automatic mode.
Line no. Operating line
HC1 HC2 3/HC3 4/DHW 5
516 536 556 576 616 Default values No
Factory setting

7Controls programming guideAndrews COMBIflo
Menu: Heating circuits
For heating circuits, there are various
functions available which can be indi-
vidually set for each heating circuit.
Operating mode HCs
The operating modes of heating cir-
cuits are selected directly with the
operating mode button. This setting is
used to switch between different ope-
rating modes. Functionality corres-
ponds to the operating mode selecti-
on via the operating mode button.
Protection
Continuous operation (24 hours) at the
frost protection level. Switching pro-
gram, occupancy button, holiday pro-
gram, optimum start / stop control
and ECO program have no impact.
Control to room temperature frost pro-
tection can be deactivated. This may
become necessary if a room thermostat
is used for activating the boiler pump.
In that case, it is only the room thermo-
stat that prevents the room temperature
from dropping. It should be considered
however that when the flow tempera-
ture drops, the limit thermostat might
cut out. The limit thermostat’s cut-out
temperature is 0 °C. This means that
cutout must be prevented by appropri-
ate setting of the room thermostat.
Automatic
Automatic operation at the Comfort,
reduced or frost protection level in ac-
cordance with the switching program,
the occupancy button, the holiday pro-
gram, optimum start / stop control and
the ECO function.
Line no. Operating line Factory setting
HC1 HC2
700 1000 Protection
Automatic
Reduced
Comfort
Automatic
Reduced
Continuous operation (24 hours) at the
reduced level. Switching program, oc-
cupancy button, holiday program, opti-
mum start / stop control and ECO pro-
gram have no impact. The protective
functions will remain active.
Comfort
Continuous operation (24 hours) at the
Comfort level. Switching program, oc-
cupancy button, holiday program, opti-
mum start / stop control and ECO pro-
gram have no impact. The protective
functions will remain active.

8
Andrews COMBIflo Controls programming guide
Menu: Heating circuits
For heating circuits, there are various
functions available which can be indivi-
dually set for each heating circuit.
Room setpoint
Room temperature
The room temperature can be shifted
according to different setpoints. These
setpoints become active depending on
the selected operating mode, thus pro-
ducing different temperature levels in
the rooms. The ranges of adjustable
setpoints result from the interdepen-
dencies, as this is shown in the follo-
wing diagram.
Frost protection
In protection mode, the room tempe-
rature is prevented from falling below
a certain level. This means that the
frost protection setpoint of the room
temperature will be maintained.
Line no. Operating line Factory setting
HC1 HC2
710 1010 Comfort setpoint 20°C
712 1012 Reduced setpoint 16°C
714 1014 Frost protection 4°C
Heating curve
The heating curve is used to genera-
te the flow temperature setpoint,
shich is used to maintain a certain
flow temperature level depending on
the prevailing weather conditions.
The heating curve can be adjusted
with a number of setting, thus mat-
ching heat output and room tempera-
ture to individual needs.
Line no. Operating line Factory setting
HC1 HC2
Heating curve slope 1,5
Heating curve slope 1,5
721 1021 Heating curve displacement 0
726 1026 Heating curve adaption Off
720 -
- 1020
TRKmax Comfort setpoint maximum
TRK Comfort setpoint
TRR Reduced setpoint
TRF Frost protection setpoints
TRF

9Controls programming guideAndrews COMBIflo
Menu: Heating circuits
Heating curve slope
As the heating curve slope is raised,
the flow temperature increases quicker
at lower outside temperature. In other
words, if the room temperature is not
correct at low outside temperatures but
correct at higher outside temperatures,
the heating curve slope requires read-
justment.
Increase adjustment:
Raises the flow temperature, especially
when outside temperatures are low.
Decrease adjustment:
Lowers the flow temperature, especially
when outside temperatures are low.
Heating curve displacement
Parallel displacement of the heating
curve is used to change the flow tem-
perature evenly across the entire outsi-
de temperature range. In other words, if
the room temperature is always too
high or too low, a readjustment must be
made with the help of the parallel dis-
placement.
Heating curve adaption
Adaption of the heating curve is used
by the controller to automatically adapt
the heating curve to the prevailing con-
ditions. In that case, a readjustment of
heating curve slope and parallel displa-
cement is not required. It can only be
switched on or off.
To assure this function, following must
be observed:
• A room sensor must be connected
• The Room influence setting must be
selected between 1 and 99
• There should be no thermostatic ra-
diator valves in the reference room
(mounting location of room sensor) (if
such valves are present, they must be
set to their fully open position).

10
Andrews COMBIflo Controls programming guide
Menu: Heating circuits
Line no. Operating line Factory setting
HC1 HC2
730 1030 Summer/winter heating limit 20°C
732 1032 24-hour heating limit -3°K
733 1033 Ext’n 24-hour heating limit Yes
ECO-Function
Summer/winter heating limit
The summer / winter heating limit is
used to switch the heating on and off in
the course of the year, depending on
temperature conditions. In automatic
mode, switching on / off takes place
automatically, so there is not need for
the user to do this manually. By chang-
ing the setting, the respective periods
of time will be shortened or extended.
Increase:
Winter operation will start earlier.
Summer operation will start later.
Decrease:
Winter operation will start later.
Summer operation will start earlier.
• The function is not active in operating
mode Comfort
• The display shows ECO
• To incorporate the building´s thermal
dynamics, the outside temperature is
attenuated
Legend
SWHG Summer / winter heating limit
t Days
T Temperature
TAged Attenuated outside temperature
24-hour heating limit
The 24-hour heating limit is used to
switch the heating on and off in the
course of the day, depending on the
outside temperature. This function is
used primarily during spring and au-
tumn to respond to short-term tempera-
ture variations.
By changing the value entered, the
respective heating periods will be short-
ened or extended.
Increase: Heating mode will start
earlier. Changeover to ECO later.
Decrease: Heating mode will start later.
Changeover to ECO earlier.
• The function is not active in operating
mode Continuously comfort tempera-
ture.
• The display shows ECO
• To give consideration to the building´s
thermal dynamics, the outside tempera-
ture will be attenuated.
Setting line E.g.
Comfort setpoint (TRw) 22°C
24-hour heating limit (THG) -3°C
Changeover temperature (TRw-THG) heating OFF = 19°C
Switching differential (fixed) -1°C
Changeover temperature heating ON = 18°C
Example
Ext’n 24-hour heating limit
The 24-hour heating limit is extended
by giving consideration to the composi-
te outside temperature when the hea-
ting is switched on. Alternatively, the
heating can be switched on again only
dependent on the current outside tem-
perature.
No
The 24-hour heating limit applies only
dependent on the current outside tem-
perature.
Yes
The 24-hour heating limit applies as
described under 24-hour heating limit,
depending on both the current and the
composite outside temperature.
.

11 Controls programming guideAndrews COMBIflo
Menu: Heating circuits
Flow temp setpoint min/ max
Using this limitation, a temperature
range for the flow temperature setpoint
can be defined. If the flow temperature
setpoint demanded by the heating cir-
cuit reaches the relevant limit and the
heat request increases or decreases,
the flow temperature setpoint will be
maintained at the maximum or mini-
mum limit.
Line no. Operating line Factory setting
HC1 HC2
740 1040 Flow temp setpoint min 8°C
Flow temp setpoint max HC1 80°C
Flow temp setpoint max HC2 80°C
741 -
- 1041
742 - Flow temp setpoint room stat HC1 65°C
- 1042 Flow temp setpoint room stat HC2 65°C
Legend
TVw Current flow temperature setpoint
TVmax Flow temperature setpoint maximum
TVmin Flow temperature setpoint minimum
Room influence
Type of compensation
When a room temperature sensor is
used, there is a choice of 3 different
types of compensation.
Pure weather compensation
The flow temperature is calculated via
the heating curve, depending on the
composite outside temperature. This
type of compensation calls for a correct
adjustment of the heating curve since in
this case the control gives no conside-
ration to the room temperature.
Weather compensation with room
influence
Deviations of the actual room tempera-
ture from the setpoint are acquired and
taken into account when controlling the
temperature. Heat gains can thus be
considered, facilitating more accurate
room temperature control. The authority
of deviation is set as a percentage
figure. The better the reference room
(correct room temperature, correct
mounting location, etc.) the higher the
value can be set.
Example:
Approx. 60 % Good reference room
conditions
Approx. 20 % Unfavorable reference
room
Line no. Operating line Factory setting
HC1 HC2
750 1050 Room influence 20%
Setting Type of compensation
- - - % Pure weather compensation *
1…99 % Weather compensation with room influence *
100 % Pure room compensation
Pure room compensation
The flow temperature is controlled
depending on the room temperature
setpoint, the current room temperatu-
re and the progression of the room
temperature. For example, a slight
increase of the room temperature
causes an immediate drop of the fol-
lowing temperature.
To activate the function, following must
be considered:
• A room sensor must be connected
• Room influence must be set to 100 %
• There should be no thermostatic radi-
ator valves in the refernce room
(mounting location of the room sensor)
(if such valves are present, they must
be set to their fully open position)
* Outside sensor required.
To activate the function, following must
be considered:
• A room sensor must be connected
• Room influence must be set to a value
between 1 and 99 %
• There should be no thermostatic ra-
diator valves in the reference room
(mounting location of the room sensor)
(if such valves are present, they must
be set to their fully open position).

12
Andrews COMBIflo Controls programming guide
Menu: Heating circuits
Room temperature control and
limitation
With the room temperature limitation
function, the heating circuit pump can
be disabled if the room temperature
exceeds the current room temperature
setpoint by more than the preset diffe-
rential.
The room temperature limitation does
not work in the case of pure weather
compensation.
.
Line no. Operating line Factory setting
HC1 HC2
760 1060 Room temp limitation 1.0°C
P Pump
SDR Room SD
t Time
TRw Room temp setpoint
TRx Actual value room temp
Boost heating
Boost heating is used to reach the
new setpoint more quickly when swit-
ching from the reduced setpoint to
the comfort setpoint, thus reducing
the heat-up time. During boost
heating, the room temperature set-
point is raised by the value set here.
A higher setting leads to shorter heat-
up times, a lower setting to longer
heat-times.
Boost heating is possible with or wit-
hout room sensor.
Line no. Operating line Factory setting
HC1 HC2
770 1070 Boost heating 2°C
DTRSA Increase room temperature setpoint
TRw Room temperature setpoint
TRx Actual value room temperature
Quick setback
During quick setback, the heating circuit
pump is deactivated and, in the case of
mixing valve circuits, the mixing valve is
fully closed.
Function with room sensor:
• When using the room sensor, the func-
tion keeps the heating switched off until
the room temperature has dropped to
the level of the reduced setpoint or the
frost level. When the room temperature
has fallen to the reduced level or the
frost level, the heating circuit pump will
be activated and the mixing valve will be
released.
• Function without room sensor:
Quick setback switches the heating off
for a certain period of time, depending
on the outside temperature and the
building time constant.
• Quick setback is possible with or
without a room sensor.
Line no. Operating line Factory setting
HC1 HC2
780 1080
Quick setback
Off
Down to reduced setpoint
Down to frost prot setpoint
Down to reduced
setpoint
Example:
Duration of quick setback when comfort setpoint minus reduced setpoint = 2 °C
(e.g. comfort setpoint = 20 °C and reduced setpoint = 18 °C)
Outside temp
composite
Time constant building (Line no. 6110)
0 2 5 10 15 20 50
15 °C 0 3.1 7.7 15.3 23 30.6 76.6
10 °C 0 1.3 3.3 6.7 10 13.4 33.5
5 °C 0 0.9 2.1 4.3 6.4 8.6 21.5
0 °C Frost protection
Duration of quick setback in hours
When differential between Comfort setpoint and reduced setpoint is f.e. 4°C, the
default values in the table will be doubled.

13 Controls programming guideAndrews COMBIflo
Menu: Heating circuits
Line no. Operating line Factory setting
HC1 HC2
790 1090 Optimum start control max 0
791 1091 Optimum stop control max 0
Optimum start / stop control
Optimum start control max
The change from one temperature level
to the other is optimized in a way that
the comfort setpoint is reached at the
relevant switching time.
Optimum stop control max
The change from one temperature
level to the other is optimized in a
way that the comfort setpoint minus
¼ °C is reached at the relevant swit-
ching time.
• Optimum start / stop control is pos-
sible with or without room sensor.
TRw Room temperature setpoint
TRx Actual value room temperature
Xoff Switch-off time shifted forward in time
Xon Switch-on time shifted forward in time
ZSP Time switch program
Raising the reduced setpoint
The function is used primarily in con-
nection with heating systems with only
little spare capacity (e.g. low-energy
houses).
In such cases, the heating up time
would be too long at low outside tempe-
ratures. When the reduced setpoint is
raised, the rooms are prevented from
cooling down to too low levels, thus
shortening the heating up time
when changing to the comfort setpoint.
Line no. Operating line Factory setting
HC1 HC2
800 1100 Reduced setp increase start - - -
801 1101 Reduced setp increase end - 15°C
TAgem Composite outside temperature
TRK Comfort cooling setpoint
TRR Reduced room temperature setpoint
TRwA1 Reduced setpoint increase start
TRwA2 Reduced setpoint increase end
Overtemperature protection
Overtemperature protection for
pump heating circuit
In the case of heating plant with pump
heating cicuits, the flow temperature of
the heating circuit can be higher than
the flow temperature demanded by the
heating curve, due to requests from
other heat consumers (mixing heating
circuit, DHW charging, external heat
demand), or a parameterized minimum
boiler temperature.
Line no. Operating line Factory setting
HC1 HC2
820 1120 Overtemperature protection for
Pump heating circuit
Off
On
On
As a result of this too high flow tempe-
rature, the pump heating circuit would
assume excessive temperatures. The
function overtemperature protection for
pump heating circuits ensures that the
energy supply for pump heating circuits
corresponds to the demand from the
heating curve by activating / deactiva-
ting the pump.
The cycling period is fixed at 10 min.
This period of time is broken down ac-
cording to a time ration.The pump’s
running time is set to a minimum of 3
minutes. The pump’s off time is set to a
minimum of 2 minutes.

14
Andrews COMBIflo Controls programming guide
Menu: Heating circuits
Mixing valve control
Mixing valve boost
To ensure proper mixing valve flow
temperature control, the flow tempera-
ture must be higher than the demanded
setpoint of the mixing valve flow tem-
perature. The value set here is added
to the request.
The selection of the type of actuator
determines the control behavior for the
type of mixing valve actuator used.
.
2-positition
The controller drives the actuator with
only one relay output. When the output
delivers a signal, the valve opens. If the
signal is missing, the valve will automa-
tically close (thermally or mechanically).
If the flow temperature lies more than
half the switching differential below
the setpoint, relay “Mixing valve ope-
ning” will be energized and remains
energized until the flow temperature
exceeds the setpoint by half the swit-
ching differential.
3-position
The controller drives the actuator with 2
relay outputs. One of the outputs is
used for opening the valve and one for
closing the valve. If none of the relays
is energized, the actuator maintains its
position.
Control is accomplished with a PID
controller, whereby XP and TN can be
parameterized. The actuator running
time can also be set. The controller’s
neutral zone is +/- 1K. In the case of
difficult controlled systems, the control
parameters can be matched
to the system.
Switching differential 2-pos
For the 2-position actuator, the 2-
postion switching differential must also
be adapted. This is not required when
using a 3-position actuator.
Actuator running time
Setting the running time of the actuator
used with the mixing valve.
Mixing valve Xp
The mixing valve´s P-band can be
adjusted, thereby matching the con-
trol behavior of the vale´s actuator to
that of the plant (controlled system).
Xp influences the controller´s
P-behavior.
Mixing valve Tn
The mixing valve´s integral action time
can be adjusted, thereby matching the
control behavior of the vale´s actuator
to that of the plant (controlled system).
Tn influences the controller´s
I-behavior.
Line no. Operating line Factory setting
HC1 HC2
830 1130 Mixing valve boost 6°C
832 1132 Actuator typ
Position-2
Position-3
3-point
833 1133 Switching differential 2-pos 2°C
834 1134 Actuator running time 120s
835 1135 Mixing valve Xp 32
836 1136 Mixing valve Tn 120

15 Controls programming guideAndrews COMBIflo
Menu: Heating circuits
Floor curing function
The floor curing function ensures con-
trolled drying of the floor. It controls the
flow temperature according to a tem-
perature profile. Drying of the floor is
ensured via the floor heating system
and the mixing or pump heating circuit.
Floor curing function
Off
Function is deactivated.
Functional heating
The first part of the temperature profile
is automatically completed.
Curing heating
The second part of the temperature
profile is traversed automatically.
Functional/curing heating
The entire temperature profile (first and
second part) is passed automatically.
Manually
It is not a temperature profile that is
completed, but the floor setpoint is con-
trolled manually.
Floor curing setp manually
The flow temperature setpoint for the
manual floor-curing function can be set
separately for each heating circuit.
Floor curing setp current
Shows the current flow temperature
setpoint while the floor-curing functi-
on is in progress.
Floor curing day current
Shows the current weekday of the floor-
curing function in progress.
Line no. Operating line Factory setting
HC1 HC2
850 1150 Floor curing function
Off
Functional heating
Curing heating
Functional/curing heating
Manually
Off
851 1151 Floor curing setp manually 25°C
855 1155 Floor curing setp current Indication only
856 1156 Floor curing day current Indication only
Bh Floor curing heating
Fh Functional heating
X Start day
• The function can be aborted by choo-
sing Off
• Maximum limitation of the flow tempe-
rature remains active
•Observe the relevant standards and
regulations of the floor manufacturer
• Proper functioning is ensured only
when the plant is correctly installed
(hydraulic
system, electrical installation, setting)! If
not observed, the floor
might get damaged

16
Andrews COMBIflo Controls programming guide
Menu: Heating circuits
Excess heat draw
Excess heat draw can be triggered by
the following functions:
- Inputs Hx
- Storage tank recooling
- Solit fuel boiler excess heat draw
When dissipation of excess heat is
activated, it can be draw by space
heating. This can be adjusted separa-
tely for each heating circuit.
Off
Excess heat draw is deactivated.
Heating mode
Excess heat is drawn only when the
controller operates in heating mode.
Always
Excess heat is drawn in all operating
modes.
Line no. Operating line Factory setting
HC1 HC2
861 1161 Excess heat draw
Off
Heating mode
always
Off
With buffer
If there is a buffer storage tank, specify
whether the heating circuit can draw
heat from it. When using alternative
heat sources, the buffer storage tak
temperature is used as a control criteria
for the release of additional heat sour-
ces.
With prim/contr system pump
Specify whether the heating circuit
receives its heat via the primary con-
troller or withthe help of the system
pump (depending on the type of plant).
Line no. Operating line Factory setting
HC1 HC2
870 1170 With buffer
No
Yes
No
872 1172 With prim/contr system pump
No
Yes
No

17 Controls programming guideAndrews COMBIflo
Menu: Heating circuits
Flow setp readj speed ctrl
Here, it can be determined whether or
not the calculated readjustment of the
flow temperature setpoint shall be inclu-
ded in the temperature request.
Line no. Operating line Factory setting
HC1 HC2
890 1190 Flow setp readj speed ctrl
No
Yes
No
Remote control
Operating level changeover
The operating level to which the heat-
ing circuits shall be switched can be
selected via an external time switch
and inputs Hx.
Optg mode changeover
The heating circuit can be forced to
adopt a selected mode via the H input
by operating a contact. The operating
mode required when the changeover is
made can be defined in the “Operating
mode changeover” parameters for each
heating circuit. In that case, selection of
the operating modes on the controller is
locked.
Line no. Operating line Factory setting
HC1 HC2
898 1198 Operating level changeover
Frost protection
Reduced
comfort
Reduced
900 1200 Optg mode changeover
None
Protection
Reduced
Comfort
Automatic
Reduced

18
Andrews COMBIflo Controls programming guide
Menu: DHW
Operating mode
The DHW operating mode is operated
directly via operating button.
Off
Continuous operation, the setpoint be-
ing the DHW frost protection setpoint
(5 °C).
On
DHW charging takes place automati-
cally, the setpoint being the nominal
DHW setpoint or the reduced DHW
setpoint based on the selected kind of
DHW release.
.
Line no. Operating line Factory setting
1600 Operating mode
Off
On
Off
Setpoints
The DHW setpoint acting on the control
is selected based on the current opera-
ting level which includes impact of the
operating mode, the release (possibly
the switching program), the DHW push
and the0 legionella function.
Nominal setpoint
Backup temperature inside the relea-
se.
Reduced setpoint
Backup temperature outside the re-
lease.
Line no. Operating line
1610 Nominal setpoint
1612 Reduced setpoint
Factory setting
55°C
40°C
DHWmax DHW nominal setpoint maximum
DHWN DHW nominal setpoint
DHWR DHW reduced setpoint

19 Controls programming guideAndrews COMBIflo
Menu: DHW
Release
24h/Day
When this setting is used, DHW heating
is continuously released as long as it is
switched on. The DHW setpoint is al-
ways the nominal setpoint, unless the
legionella function has been activated.
Line no. Operating line
1620 Release
24h/day
Time programs HCs
Time program 4/D HW
Factory setting
Time program heating circuits
06121824
h
2371Z18
Time programs HCs
When this setting is used, DHW heating
is released during the occupancy times
of the connected heating circuits. If at
least one of the heating circuits is at the
Comfort level, DHW heating will also be
released. If all heating circuits are at
the reduced level or in
protective mode, the DHW level will
also be set to reduced.
0612 245h
2377Z16
16 17
Time program 4/DHW
When using this setting, a specific time
program is available for DHW heating.
For every weekday, a time program
with a maximum of three on phases
can be set. During the release time, the
nominal DHW setpoint applies, outside
the release time, the reduced DHW
setpoint.If the legionella function is
pending, it will be performed when
DHW heating is released for the first
time in the morning. Setting “Once /
several times per day” has no impact. If
DHW heating is switched off, the frost
protection setpoint will apply.
06121824
h
2373Z24
example
example
example
Charging priority
When both space heating and DHW
heating call for heat, the DHW priority
function ensures that while DHW char-
ging is in progress, the boiler’s capacity
is used primarily for DHW heating.
With diverting valves, the function is
automatically deactivated.
Absolute
The mixing and pump heating circuits
stay locked until DHW heating is com-
pleted.
Line no. Operating line Factory setting
1630 Charging priority
Absolute
Shifting
None
MC shifting, PC absolute
MC shifting, PC absolute
Shifting
If the capacity of the heat source is not
sufficient, the mixing and pump heating
circuits will be restricted until DHW is
heated up.
None
DHW heating and space heating take
place at the same time. In the case of
tightly sized boilers and mixing heating
circuits,
the DHW setpoint may not be reached
if space heating demands considerable
amounts of heat.
MC shifting, PC absolute
The pump heating circuits stay locked
until the DHW storage tank is heated
up. If the capacity of the heat source is
not sufficient, the mixing heating cir-
cuits will be restricted also.

20
Andrews COMBIflo Controls programming guide
Menu: DHW
Legionella function
Off
The function is deactivated.
Periodically
The legionella function is repeated ac-
cording to the interval set (operating
line 1641). The legionella setpoint is
attained via a solar plant, independent
of the period of time set, the period of
time will be newly started. This means
that the heat source is switched on only
if the solar plant could not deliver the
required “Legionella function setpoint”
within the adjusted period of time.
Fixed weekday
The legionella function can be activated
on a fixed weekday (operating line
1642). When using this setting, heating
up to the legionella setpoint takes place
on the selected weekday, independent
of previous storage tank temperatures.
This setting is intended primarily for
plant with no solar integration.
Legionella funct periodically
Setting “Legionella funct periodically” is
used to select after how many week-
days the function shall be activated
again. (This setting is active only if pa-
rameter “Legionella function” is set to
“Periodically”).
Legionella funct weekday
Parameter “Legionella funct weekday”
is used to select on which weekday the
function shall be performed. The functi-
on is carried out on the selected week-
day, independent of the availability of
alternative energy.
Legionella function time
The legionella function is started at the
time set. The DHW setpoint is raised to
the adjusted legionella setpoint and
DHW charging is started.
If no time is parameterized, the legio-
nella function is started on the respecti-
ve day together with the first normal
release of DHW heating. If no release
of DHW heating is scheduled for that
day (continuously reduced), the legio-
nella function will be performed
at 24:00.
Line no. Operating line
1640 Legionella function
Off
Periodically
Fixed weekday
1641 Legionella funct periodically
1642 Legionella funct weekday
Mo - Su
1644 Legionella function time
1645 Legionella funct setpoint
1646 Legionella funct duration
1647 Legionella funct. circ. pump
Off
On
Factory setting
Off
All 3 days
Monday
- - : - -
65°C
30 min
On
If DHW heating is switched off (DHW
operating mode button = off or holi-
days), the legionella function will be
made up for as soon as DHW heating
is switched on again (DHW operating
mode button = on or end of holiday
period).
Legionella funct setpoint
The higher the temperature level of the
storage tank, the shorter the required
dwelling time at that level.
Legionella funct duration
The demanded “Legionella function
setpoint” must be continuously maintai-
ned during the dwelling time set. If the
storage tank temperature (in the case
of 2 sensors, the temperature acquired
by the “colder” sensor) exceeds the
“Legionella function setpoint” minus 1
K, the “Legionella function setpoint” is
considered fulfilled and the “Dwelling
time” timer elapses. If the storage tank
temperature drops below the deman-
ded “Legionella function setpoint” by
more than the switching differential plus
2 K before the dwelling time has
elapsed, the dwelling time must be ful-
filled again. If no dwelling time is set,
the “Legionella” function is performed
the moment the “Legionella function
setpoint” is reached.
If the “Legionella” function cannot be
performed within a 48-hour period, an
error message will be delivered.
Legionella funct circ pump
When the function is activated, the cir-
culating pump is switched on while the
“Legionella” function is performed as
soon as the storage tank temperature
(in the case of 2 sensors the tempera-
ture acquired by the “colder” sensor)
lies above the “Legionella function set-
point” minus 1 K. The pump runs during
the dwelling time set. If the storage
tank temperature falls below the de-
manded “Legionella function setpoint”
by more than the DHW switching diffe-
rential plus 2 K, the circulating pump
will prematurely be deactivated.
During the time the legionella function
is performed, the DHW circulating
pump can be activated.