Atag iC Economiser 27 Quick start guide

Appliance
Technical Guide
SERVICE ENGINEER EDITION

2
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industry has
just had an
upgrade
We will help you grow and protect
your business.
Now you
have too

3
Contents
APPLIANCES COVERED AND SERIAL NUMBER 4
iC & iC ECONOMISER COMBINATION BOILERS
TECHNICAL DATA 5
iS SYSTEM & iR REGULAR BOILERS
TECHNICAL DATA 6
BOILER L AYOUT 7
CONTROL PANEL 8
CONTROLS AND EXPLANATION
OF THE FUNCTIONS 9
HOT WATER TEMPERATURE 9
CENTRAL HEATING TEMPERATURE 9
BOILER INFORMATION 9
RESET BUTTON 10
ANCILLARY FUNCTIONS 10
HOT WATER SUPPLY 11
COMFORT AND ECO 11
CH SYSTEM 11
FROST PROTECTION 11
DANGER OF FROST 11
INSTALLATION FROST PROTECTION 11
BOILER FROST PROTECTION 11
PUMP KICK AND DIVERTER
VALVE KICK 12
BOILER ANTI-CYCLE TIME 12
PUMP OVERRUN 12
SERVICE CHIMNEY SWEEP MODE 12
BOILER DE-AERATION PROGRAM 13
COMBI BOILER 13
SYSTEM BOILER 13
REGULAR BOILER 13
COMMISSIONING FUNCTION 13
YOU HAVE UPGRADED TO ATAG, WE WILL HELP YOU TO GROW AND PROTECT YOUR BUSINESS
WATER PRESSURE SENSOR 14
FLOW SWITCH (REGULAR BOILER) 14
COMBI BOILER CENTRAL HEATING MODE (CH) 15
COMBI BOILER HOT WATER MODE (DHW) 16
COMBI BOILER CH MODE 17
CH CONTROLS 17
COMBI BOILER DHW MODE 17
DHW CONTROLS (COMBINATION BOILERS) 17
SYSTEM & REGULAR BOILER CENTRAL
HEATING MODE 17
CH CONTROLS 17
CHECKING COMBUSTION CO218
BOILER PARAMETERS 19
GRADIENT SPEED CH 20
HEATING LINE 20
SUMMER-ECO TEMPERATURE 20
WEATHER COMPENSATOR 21
FLUE LENGTHS 21
ERROR CODES 22
RESISTANCE TABLE SENSORS 23
PCB ELECTRICAL DIAGRAM (LMU) 24
VOLT FREE CONNECTIONS 25
ATAG 3-PORT EXTERNAL DIVERTER
VALVE AND ONE CONTROLLER KIT 26
ROUTINE SERVICING 30
AIR BOX/COVER 30
SIPHON 31
FAN UNIT AND BURNER CASSETTE 31
HEAT EXCHANGER 33
IGNITION ELECTRODE 34

MODEL GC NUMBER
iC 24 Combination Boiler 47-310-19
iC 28 Combination Boiler 47-310-21
iC 36 Combination Boiler 47-310-23
iC 40 Combination Boiler 47-310-25
iC 24 Combination Boiler LPG 47-310-20
iC 28 Combination Boiler LPG 47-310-22
iC 36 Combination Boiler LPG 47-310-24
iC 40 Combination Boiler LPG 47-310-26
iC Economiser 27 Combination Boiler 47-310-27
iC Economiser 35 Combination Boiler 47-310-29
iC Economiser 39 Combination Boiler 47-310-31
iC Economiser 27 Combination Boiler LPG 47-310-28
iC Economiser 35 Combination Boiler LPG 47-310-30
iC Economiser 39 Combination Boiler LPG 47-310-32
iS 15 System boiler 41-310-20
iS 18 System boiler 41-310-22
iS 24 System boiler 41-310-24
iS 32 System boiler 41-310-26
iS 40 System boiler 41-310-28
iS 15 System boiler LPG 41-310-21
iS 18 System boiler LPG 41-310-23
iS 24 System boiler LPG 41-310-25
iS 32 System boiler LPG 41-310-27
iS 40 System boiler LPG 41-310-29
iR 15 Regular boiler 41-310-32
iR 18 Regular boiler 41-310-34
iR 24 Regular boiler 41-310-36
iR 32 Regular boiler 41-310-38
iR 40 Regular boiler 41-310-40
iR 15 Regular boiler LPG 41-310-33
iR 18 Regular boiler LPG 41-310-35
iR 24 Regular boiler LPG 41-310-37
iR 32 Regular boiler LPG 41-310-39
iR 40 Regular boiler LPG 41-310-41
SERIAL NUMBER: P144040766
P 14 40 4 0766
YEAR WEEK DAY No.
Appliances covered
and serial number
4

iC & iC Economiser combination
boilers technical data
iC ECONOMISER COMBINATION BOILERS iC Economiser 27 iC Economiser 35 iC Economiser 39
Part number BE200127 BE200135 BE200139
ErP Seasonal space heating energy eciency class A A A
ErP Seasonal space heating energy eciency (%) 94 94 94
ErP Water heating energy eciency class A A A
ErP Water heating energy eciency (%) 94 96 96
ErP Declared load profile DHW XXL XXL XXL
DHW input (kW) 29.8 40.3 42.5
CH output (kW) 23.2 31.2 31.2
Hot water flow rate @ 35°C rise (l/min) 12.6 16.1 17.0
SEDBUK 2009 (%) 89.7 89.7 89.7
Dimensions (H x W x D) (mm) 700 x 440 x 355 700 x 440 x 355 700 x 440 x 355
Boiler lift weight with jig (Kg) 43 46 46
Standard warranty (years) 10 10 10
LPG conversion kit available Yes Yes Yes
NOx class 6 6 6
Ingress protection (IP) IPX4D IPX4D IPX4D
Maximum equivalent horizontal flue length (m) 60/100mm 18 6 6
Maximum equivalent vertical flue length (m) 60/100mm 18 6 6
Maximum equivalent horizontal flue length (m) 80/125mm 50 45 45
Maximum equivalent vertical flue length (m) 80/125mm 50 45 45
iC COMBINATION BOILERS iC24 iC28 iC36 iC40
Part number BC100124 BC100128 BC100136 BC100140
ErP Seasonal space heating energy eciency class A A A A
ErP Seasonal space heating energy eciency (%) 94 94 94 94
ErP Water heating energy eciency class A A A A
ErP Water heating energy eciency (%) 85 84 90 90
ErP Declared load profile DHW XL XL XL XL
DHW input (kW) 26.6 30.3 39.3 42.0
CH output (kW) 23.2 23.2 31.2 31.2
Hot water flow rate @ 35°C rise (l/min) 10.1 11.5 14.9 16.2
SEDBUK 2009 (%) 89.7 89.7 89.7 89.7
Dimensions (H x W x D) (mm) 700 x 440 x 355 700 x 440 x 355 700 x 440 x 355 700 x 440 x 355
Boiler lift weight with jig (Kg) 41 41 44 44
Standard warranty (years) 10 10 10 10
LPG conversion kit available Yes Yes Yes Yes
NOx class 6 6 6 6
Ingress protection (IP) IPX4D IPX4D IPX4D IPX4D
Maximum equivalent horizontal flue length (m) 60/100mm 18 18 6 6
Maximum equivalent vertical flue length (m) 60/100mm 18 18 6 6
Maximum equivalent horizontal flue length (m) 80/125mm 50 50 45 45
Maximum equivalent vertical flue length (m) 80/125mm 50 50 45 45
5

iS SYSTEM BOILERS iS15 iS18 iS24 iS32 iS40
Part number BS300115 BS300118 BS300124 BS300132 BS300140
ErP Seasonal space heating energy eciency class A A A A A
ErP Seasonal space heating energy eciency (%) 93 93 94 94 94
CH output kW (50/30°C) 14.7 17.5 23.2 31.2 38.8
SEDBUK 2009 (%) 89.8 89.8 89.8 89.8 89.8
Dimensions (H x W x D) (mm) 700 x 440 x 355 700 x 440 x 355 700 x 440 x 355 700 x 440 x 355 700 x 440 x 355
Boiler lift weight with jig (Kg) 39 39 39 42 42
Standard warranty (years) 10 10 10 10 10
LPG conversion kit available Yes Yes Yes Yes Yes
Solar compatible Yes Yes Yes Yes Yes
NOx class 6 6 6 6 6
Ingress protection (IP) IPX4D IPX4D IPX4D IPX4D IPX4D
Maximum equivalent horizontal flue length (m) 60/100mm 18 18 18 6 6
Maximum equivalent vertical flue length (m) 60/100mm 18 18 18 6 6
Maximum equivalent horizontal flue length (m) 80/125mm 50 50 50 45 45
Maximum equivalent vertical flue length (m) 80/125mm 50 50 50 45 45
iR REGULAR BOILERS iR15 iR18 iR24 iR32 iR40
Part number BR400115 BR400118 BR400124 BR400132 BR400140
ErP Seasonal space heating energy eciency class A A A A A
ErP Seasonal space heating energy eciency (%) 94 94 94 94 94
CH output kW (50/30°C) 14.7 17.5 23.2 31.2 38.8
SEDBUK 2009 (%) 89.8 89.8 89.8 89.8 89.8
Dimensions (H x W x D) (mm) 700 x 440 x 355 700 x 440 x 355 700 x 440 x 355 700 x 440 x 355 700 x 440 x 355
Boiler lift weight with jig (Kg) 32 32 32 35 35
Standard warranty (years) 10 10 10 10 10
LPG conversion kit available Yes Yes Yes Yes Yes
Solar compatible Yes Yes Yes Yes Yes
NOx class 6 6 6 6 6
Ingress protection (IP) IPX4D IPX4D IPX4D IPX4D IPX4D
Maximum equivalent horizontal flue length (m) 60/100mm 18 18 18 6 6
Maximum equivalent vertical flue length (m) 60/100mm 18 18 18 6 6
Maximum equivalent horizontal flue length (m) 80/125mm 50 50 50 45 45
Maximum equivalent vertical flue length (m) 80/125mm 50 50 50 45 45
iS system and iR regular
boilers technical data
6

iC ECONOMISER COMBINATION BOILER LAYOUT
1Heat exchanger 9Control panel 17 Safety valve
2Ignition unit 10 Three-way valve 18 DHW Economiser
3Fan unit 11 Circulation pump 19 Siphon
4Air supply damper 12 Filling loop 20 Isolation valve flow CH
5Gas valve 13 Flue gas exhaust 21 Isolation valve gas
6Automatic de-aerator 14 Combustion air supply 22 Isolation valve cold water
7DHW plate heat exchanger 15 Boiler data plate 23 Isolation valve return CH
8Control unit 16 Expansion vessel 24 Flue non return valve
T1 Flow sensor P1 Water pressure CCondensation pipe
T2 Return sensor GGas pipe KCold water pipe
T3 Hot water sensor AFlow pipe CH WHot water pipe
F1 DHW flow sensor RReturn pipe CH
Boiler layout
20
A W G
21
K
22
R
23
13
14 5
24 6
3
2 1
16
T1
P1
T2
18 15
7 4
11 9
12
817
19C
F1
T3
10
7

DHW function ON / Flashing request for heat
ECO DHW ECO mode or DHW comfort mode
Flame Burner on
Heating function ON / Flashing request for heat
Bell Error indication
Spanner Service mode or blocking
Snow Flake Frost protection
LCD display
with backlight
Full load for
emissions check
Directly operated
soft cushion button
OK and Escape
(ancillary function)
Scroll and + / −
function
(ancillary function)
Setting of boiler temperature
(max. supply temperature)
Eco buttonReset button
Setting of hot water temperature
Frost protection
manual mode
Control panel
(All ATAG boiler range)
8

Hot water temperature
Setting the hot water temperature:
Briefly press +or -; the display will show the flashing pre-set value;
Briefly press +or -to change the set value. Each change becomes
active directly.
Hot water program OFF: Press -until the lowest value is reached
and then press -again, -- appears in the display.
The will disappear from the display
Switching on works in reverse order.
(combi boiler only)
Central heating temperature
Setting the CH water temperature:
Briefly press +or - ; the display will show the flashing pre-set value;
Briefly press +or -to change the set value. Each change becomes
active directly.
CH program OFF: Press -until the lowest value is reached and then
press -again, -- appears in the display.
The will disappear from the display
Switching on works in reverse order.
Boiler Information
By pressing the eco button for 6 seconds the display changes to info mode
A0: Flow water temperature in °C
A1: Return water temperature in °C
A2: DHW temperature in °C (combi or system boiler with 3-port kit only)
A3: T-set temperature (calculated) in °C
A4: Flue gas temperature (only if a flue gas sensor is connected) in °C
A5: Outside temperature (only if an outside sensor is connected) in °C
A6: Water pressure in bar (combi & system boilers only)
A7: DHW flow rate in l/min (combi only)
A8: Ionisation current in µA.
A9: rpm of fan (x100)
To return to the standard view press ESC.
Controls and explanation
of the functions
scroll
scroll
scroll
9

Reset button
The reset button allows the boiler to restart if an error has occurred.
In case of an error the symbol is displayed with a XXX code.
In other cases the reset button does not function and will not respond to
operation.
scroll
Ancillary functions
scroll
Both + buttons = Commissioning-mode
for checking the CO2
Both – buttons: Pump continuous on/o
DHW button: Scroll function
(‘scrolling’ through parameters)
CH + button = OK (confirm)
CH – button = ESC function
(back to standard display)
10

Hot water supply
The DHW program is always active after start-up.
This is indicated by a solid . The boiler will fire up for DHW
because of the comfort setting.
If there is hot water request, this is indicated by a flashing and
the hot water supply will be activated. The circulation pump will
start circulating and the burner will switch on .
(combi boiler or system boilers with ATAG 3-port diverter kit)
Comfort and eco
By default the hot water supply is set to comfort
(keep hot facility 50°C).
A change to eco is possible by means of pressing the eco button.
On the display appears ‘eco’.
The eco-position will result in a possible longer DHW waiting time,
because the boiler will not being fired up for pre-heating the hot
water supply.
CH system
The CH program is always active after start-up.
This is indicated by a solid .
If there is heat request, it is indicated by a flashing and the
heating will be put into operation .
The circulation pump will switch on and the boiler will switch on
after 1 to 2 minutes.
When there is no more heat requested the radiator symbol
may be solid or flashing, but the flame symbol will disappear.
The pump will continue to run for 60 seconds due to the pump
over run feature.
Frost protection
Danger of frost
If there is danger of frost damage to the CH installation and there is
no outside sensor connected, it is advisable to let the pump run
continuously.
By pressing both -buttons at the same time for 6 seconds the pump
can be switched on continuously.
If the pump is set to continuously this is displayed by a solid .
Installation frost protection
If an outside sensor is connected, then the controls will regulate the
pump:
- In case of outside temperatures between +1.5 and -5°C the
pump will run for 10 minutes every 6 hours.
- In case of outside temperatures below -5°C the pump will run in
frost protection mode.
Boiler frost protection
If there is no outside sensor connected, and if the (T1) flow sensor
registers a temperature of 5°C or below in the boiler, the boiler will
fire up. The boiler keeps on firing until the temperature reaches 10°C
(measured on the flow sensor) and the boiler switches o again.
In this mode the symbol will flash.
11

Pump kick and diverter valve kick
Every 24 hours, if there is no heat demand from heating or DHW the pump will be started
for 10 seconds and the diverter valve will be opened and closed again.
This is done to prevent the pump and diverter valve from sticking.
Boiler anti-cycle time
If during a demand for central heating the burner switches o, because the desired flow
temperature is exceeded, there will be an anti-cycle time in operation for 5 minutes. This
means that the burner switches on again after 5 minutes if there is still a demand for the
heating.
Pump overrun
After the heating demand the burner will shut down and the pump will run for a further
60 seconds.
Service chimney sweep mode
To enter the service chimney sweep mode you hold the two +buttons for 6 seconds
When the flame symbol appears in the display, press both +buttons again for 6 seconds.
• The display shows the supply water temperature (appears in the display)
Press 1x the eco button; the display shows XX% (heating capacity)
Then with the + / - button for DHW you can go to a dierent load, anything between full
(100%) and low load (0%)
Turning o chimney sweep mode:
• Press the ESC button ( button)
• The device switches o
• The display shows for 2 seconds code 180 or 181
The chimney sweep mode lasts for 8 minutes
Scroll and + / − function
(ancillary function)
Full load for
emissions check
%
bar
°C
°C
12

Boiler de-aeration program
Combi boiler
The boiler is equipped with an automatic boiler de-aeration program.
The installation system needs to be filled with water and bled free of air before turning
power onto the boiler. Then the automatic de-aeration program will ensure that the boiler
is free of air before firing up.
The automatic de-aeration program starts when the water pressure in the boiler gets to
1.1 bar. The complete program for the boiler de-aeration takes 7 minutes.
During this 7 minutes, the pump is started and stopped and the three way diverter valve
is alternately sent to the heating and to the DHW position several times and with short
pauses to make sure that the air inside the boiler leaves through the automatic air vent.
System boiler
Same as combi, but there is no internal diverter valve to move.
Regular boiler
Same as combi, but there is no diverter valve to move or a pressure reading and there is a
feed & expansion tank.
1. Turn on the boiler electrical supply
2. When the boiler starts up for the first time the following will be shown:
- - (power on)
All digits (segment test)
0(parameter 9: from factory 0)
1(boiler type: parameter 8)
03 followed by 07 (software version part 1 and software version part 2)
3. The code 105 appears on the display; The 7 minute de-aeration cycle starts
4. Vent the entire heating installation starting at the lowest point
5. Check the water pressure and top up if necessary to 1.0 – 1.2 bar
6. Check the filling loop if it is closed
%
bar
°C
°C
Commissioning function
13

Water pressure sensor
The iC, iC Economiser & iS boilers are supplied with a pressure sensor.
This sensor control has following settings:
Prior to P1627xxxxx the reading are:
0.7 bar: below this pressure the burner is blocked for operation
0.7 to 1.0 bar: boiler output reduced to 80%
1.0 to 3.0 bar: boiler fully functional
3.0 bar: above this pressure the boiler is blocked for operation.
After P1628xxxxx the reading are:
0.5 bar: below this pressure the burner is blocked for operation
0.5 to 0.8 bar: boiler output reduced to 80%
0.8 to 3.0 bar: boiler fully functional
3.0 bar: above this pressure the boiler is blocked for operation.
Flow switch (regular boiler)
In the regular boiler there is no pump inside and because of the low pressure there is
no pressure sensor inside as well. To register if the system pump is working and there is
water in the system there is a flow switch and this flow switch sets the burner free.
If the water pressure drops below 0.8 bar code 118 will appear in the display; The boiler
will stay in operation with a limited output (80%) until the pressure drops below 0.5 bar
where the boiler will then shut down.
This will disappear again the moment the water pressure is higher than 1.1 bar and the
de-aeration program will start (code 105).
This will take approx. 7 minutes and will be followed by the default display (OK).
The boiler will switch on immediately to reach the desired pre-heat temperature (approx.
50°C) of the hot water supply (comfort setting).
%
bar
°C
°C
14

Combi boiler central heating mode (CH)
C.H. Demand
Pump On Error Code 118
Pump Check by
Water Pressure - OK
Diverter Valve
CH Position
Gas Valve Start
Sequence
Fan On RPM Check - OK
No Ignition
5 Attempts –
Ignition
Achieved
Boiler Operating
Error Code 151
Gas Valve Opens
Spark
Ignition
Flame ON
Flame
Stabilization
5 Seconds
Stabilization
No Flame
Detection
Boiler Will Go
To Low Load
Error Code 133 Reset
5 Attempts –
Ignition Achieved
NO
NO
NO
YES
YES
YES
YES
15

Combi boiler hot water mode (DHW)
D.H.W. Demand
Pump On Error Code 118
Pump Check by
Water Pressure - OK
Diverter Valve
D.H.W. Position
Gas Valve Start
Sequence
Fan On RPM Check - OK
No Ignition
5 Attempts –
Ignition
Achieved
Boiler Operating
Error Code 151
Gas Valve Opens
Spark
Ignition
Flame ON
Flame
Stabilization
5 Seconds
Stabilization
No Flame
Detection
D.H.W. Rated
Output
Error Code 133 Reset
5 Attempts –
Ignition Achieved
NO
NO
NO
YES
YES
YES
YES
16

Combi boiler CH mode
CH controls
With a demand from the heating controls after DHW demand, the boiler activates its 1 minute delay period. This is to
prevent the heat exchanger from losing its heat too quickly in the event of a hot water demand.
Then the pump starts and after 30 seconds the gradient control becomes active and the boiler fires up. The starting
point of the gradient control is the currently existing flow temperature. A Delta-T control (25K) ensures a stable control
according to heat request.
If the flow temperature is below the T-set value of 20°C the boiler will immediately start.
If during a demand from the heating the burner switches o, because the desired flow temperature is exceeded, there
will be an anti-cycle time in operation for 5 minutes.
This means that the burner switches on again after 5 minutes if there is still a demand from the heating.
Combi boiler DHW mode
DHW controls (combination boilers)
If a hot water tap is opened the flow sensor measures (F1) the amount drawn o.
Depending on the desired DHW temperature and volume the controls will calculate an output. This realises the desired
water temperature in an ecient way. The hot water sensor (T3) will adjust any minor deviations caused by temperature
fluctuations so that even under these circumstances the desired temperature is constant.
System & regular boiler central heating mode
CH controls
With a demand from the heating controls, the boiler activates its 1 minute delay period. This is to prevent the heat
exchanger from losing its heat too quickly in the event of a hot water demand.
Then the pump starts and after 30 seconds the gradient control becomes active and the boiler fires up. The starting
point of the gradient control is the currently existing flow temperature. A Delta-T control (25K) ensures a stable control
according to heat request.
If the flow temperature is below the T-set value of 20°C the boiler will immediately start.
If during a demand from the heating the burner switches o, because the desired flow temperature is exceeded, there
will be an anti-cycle time in operation for 5 minutes.
This means that the burner switches on again after 5 minutes if there is still a demand from the heating.
17

Checking combustion CO2
The CO2percentage is set in the factory. This has to be checked during commissioning,
inspection, maintenance and in case of a failure.
CO2High Load reading
CO2Low Load reading
Finally, the CO2percentage at low load must
be checked:
• Press on the DHW - button until the minimum
value (0%) has been reached (low load)
This can be verified by means of the following action:
• Set the external controls to call for heat
• Make sure the boiler is operational and can get rid of the heat it produces
• Calibrate the flue gas analyser
• Place the lance of the flue gas analyser into the flue gas test point
• Press both +buttons for 6 seconds
When the flame symbol and supply water temperature appears in the display the boiler
will be in max heat output CH.
• Press 1x the eco - button; the display shows:
1. Flow temp
2. Fan speed
• Press both +buttons again for 6 seconds;
The boiler will switch to max heat output DHW for iC range or again max heat output
CH for iS & iR range.
• Press 1x the eco - button; the display shows:
1. Flow temp
2. XX% (heat capacity)
3. Fan speed
Then with the + / - button for DHW you can go to a dierent load, anything between full (100%)
and low load (0%)
°C
NOTE: UNDER ALL CIRCUMSTANCES THE CO2AT LOW LOAD MUST BE LOWER THAN THE CO2 AT FULL LOAD.
End of measuring:
• Press the ESC button ( button).
The device switches o. The display shows
for 2 seconds code 180 or 181.
This complete the procedure.
FULL LOAD NATURAL GAS G20 PROPANE GAS G31
CO2
Nominal 9.0% Nominal 10.3%
Minimum 8.6% – Maximum 9.6% Minimum 9.9% – Maximum 11.0%
If required, you
may turn the
setting screw to
set the correct CO2
percentage.
NATURAL GAS G20 LPG G31
Full load recorded Accepted low load range Full load recorded Accepted low load range
9.6% 9.3% – 7.5% 11.0% 10.9% – 8.9%
9.5% 9.2% – 7.5% 10.9% 10.8% – 8.9%
9.4% 9.1% – 7.5% 10.8% 10.7% – 8.9%
9.3% 9.0% – 7.5% 10.7% 10.6% – 8.9%
9.2% 8.9% – 7.5% 10.6% 10.5% – 8.9%
9.1% 8.8% – 7.5% 10.5% 10.4% – 8.9%
9.0% 8.7% – 7.5% 10.4% 10.3% – 8.9%
8.9% 8.6% – 7.5% 10.3% 10.2% – 8.9%
8.8% 8.5% – 7.5% 10.2% 10.1% – 8.9%
8.7% 8.4% – 7.5% 10.1% 10.0% – 8.9%
8.6% 8.3% – 7.5% 10.0% 9.9% – 8.9%
9.9% 9.8% – 8.9%
°C
18

To check or change parameters settings, proceed as follows:
1. Press the OK button for 3 seconds. The display shows ‘P0’.
2. Press the OK button for 3 seconds again. The display shows ‘on’ shortly
followed by ‘P0’.
3. Press the Scroll button up or down to select another parameter.
4. Press the OK button if you want to change the selected parameter.
5. Adjust the value if desired / possible with the +or -button (DHW button).
6. Briefly press the OK button to confirm the new setting.
7. The display shows the selected parameter again.
8. Press the ESC button until the default display is shown again.
9. If during 8 minutes no button is used, the default display is automatically
shown on the screen.
PAR FACTORY
SETTING DESCRIPTION RANGE
PO 1 1. CH Tmax: 80°C; Gradient: 5; Heating line 24
2. CH Tmax: 70°C; Gradient: 5; Heating line 19
3. CH Tmax: 60°C; Gradient: 4; Heating line 15
4. CH Tmax: 50°C; Gradient: 3; Heating line 11
1 - 4
P1 Max Maximum power CH in %
Can only be reduced. 0 = low load
0 - max
P2 Max Pump, max. percentage XX - 100%
P3 Min Pump, min. percentage Min -XX / XX*
P4 0% Correction factor fan speed. DO NOT CHANGE!
P5 5 (NG)
0 (LPG) Gradient speed CH 0 - 15 (0 = o)
P6 24 Heating line CH-water temperature (see also heating line graph on page 21) 1 - 30
P7 25 Summer-eco temperature (only when outside sensor is connected)
Heating program switch o at set outside temperature
8 - 30
P8 2 Boiler type. DO NOT CHANGE!
1 = Natural gas fired boiler, 2 = Boiler with flue non-return
valve, 3 = Propane gas fired boiler
1 - 3
P9 0 Service-parameter. DO NOT CHANGE!
Boiler parameters
*Depending on connected type of boiler control.
19

Gradient speed CH
The gradient allows the boiler to increase the CH water temperature with a pre-set (parameter 5) number of degrees per
minute. The number of degrees can be set between 1 and 15 per minute (factory set to 5).
The Gradient control is a calculated increase of the T-Set value. When the flow temperature is 5 degrees higher than the
T-set temperature, the boiler will switch o. So if you set the max flow temperature to 80 the boiler will switch o at 85.
Scenario:
Boiler set with parameter 5 with a gradient speed CH of 5 = 5°C per minute increase.
CH T-max 80°C
If the boiler starts with 35°C flow temperature the boiler will calculate a T-set temperature using the gradient line.
This will look to raise the flow temperature to 40°C after 1 minute and look to raise it a further 5°C the minute after, as
an on ongoing gradient line, which is recalculated as the boiler is working. If the boiler goes past this gradient line T-set
temperature by more than 5°C the boiler will switch o. The boiler 5 minute anti-cycle feature will operate. When the
boiler comes back on again it will start the process o again with the new flow temperature.
A boiler / system that cannot get rid of this heat eectively will see a rapid increase in the flow temperature (more
than the 5°C per minute it has been set up to do). The flow temperature will quickly go over the calculated T-set
temperature (gradient) by the 5°C and would switch o.
The following gradient speed settings are recommended for each type of heating system:
1 – 2 underfloor heating
4 – 5 Radiator convectors
7 – 8 Indirect heated air heater
Setting the gradient parameter to P5 = 0
If you set this to 0, you switch o the gradient control and the T-set is the temperature set with the CH button (normally 80°C).
In this case there is no limit to the number of degrees temperature increase per minute and the boiler will try to reach its
set point as quickly as possible.
So the boiler will go to full load and try to reach the set water temperature set under the CH button.
There is no restriction to the number of degrees temperature increase per minute (The brake is o). The boiler will then
modulate, because the delta T is reached. The boiler will try and maintain the delta T across the heat exchanger around 20°C.
Heating line
The heating line is used when an outside sensor or ONE controller is used via a Wi-Fi connection to give an outside
temperature. The boiler takes into account the outside temperature to give a calculated flow temperature to the
heating system. The ONE is an OpenTherm thermostat and will overrule some settings in the boiler.
This is shown in the weather compensator section.
Summer-eco temperature
If an outside sensor is fitted, then the summer eco mode becomes active.
The summer-eco temperature is at what temperature the boiler stops operating for heating, because the temperature is
higher than the set summer-eco temperature. This is based on the average outside temperature, with the calculation of
the average outside temperature (Factory setting 25°C).
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