Mark Climate POWERFLEX User manual

Technical manual EN
MARK POWERFLEX 0660405_R03

2
INSTRUCTIONS FOR USER
If you have questions concerning the use of your boiler or heating system, please ask your
installer. It is in your own interest and that of the installer that you are aware of how to
operate your boiler and heating system safely and efciently.
Operation
Water, coming from the radiators or from the DHW unit is heated in the aluminium heat exchanger.
The CH or DHW pump guarantees circulation of water. The air needed for combustion is sucked in
by a rpm controlled fan. At low boilertemperatures the uegasses can be cooled down sufciently for
condensation of the water.This water is drained to the sewer via a built in syphon. This drainage may
never be blocked. A burnercontroller with built in micro-processor takes care of the electrical regulation
of the boiler.
Topping up
The built in manometer indicates if the waterpressure is sufcient. As soon as the waterpressure drops
below 1 bar topping up is necessary. If topping up becomes a regular occurrence, your installation should
be checked by an installer.
Disconnect from the main. Connect the lling hose to the cold water tap and to the ll and drain valve
of the boiler. Before tightning the coupling in the installation slowly ll the hose with water allowing
present air to escape. Now open the ll and drain valve and slowly ll the installation till a pressure
between 1.5 and 2.0 bar is reached. When nished connect again to the main.
Bleeding
To remove any air present in the heating system and boiler, bleeding is necessary. Disconnect from the
main. Open all the radiator valves. Bleed the air from all the radiators starting with the ones at the
lowest point in the system.After bleeding, check the water pressure and top up if required (if water
pressure has dropped below 1 bar). Connect to the main again.
Starting the boiler
Please ask your installer how to start the boiler. Depending on how your heating system is controlled,
this could be via an external timeclock, thermostat, switch or otherwise. Once the boilerVolt-free enable
contacts are closed, the boiler will commence its starting sequence.
Boiler ow temperature
The burner controller adjusts the owtemperature between 20 ° and 85 °C. The temperature setting
can be changed using the control panel.The installation manual provides the instructions for setting the
ow temperature.
DHW (Hot Water) temperature (if applicable)
From the factory the DHW temperature is set to a value of 60 °C. This set value can be changed into
a value between 35 and 65 °C with help of the buttons on the control panel. If the DHW device has a
thermostat the DHW temperature can be adjusted by setting this thermostat.
Warning
Incorrect installation, adjustment, alteration, repair or maintenance work may lead to material
damage or injury. All work must be carried out by certied, qualied professionals. If the appliance
is not positioned in accordance with the instructions, the warranty shall be rendered void. This
appliance is not intended for use by children or persons with a physical, sensory or mental
handicap, or who lack the required experience or expertise.Children must be supervised to
ensure that they do not play with the appliance.

3
EN
Switching off the boiler
During summer time the room thermostat can be set to a lower value to turn off the boiler. During
winter or during a longer periode of absence this temperature never should be set to a lower value than
15 °C. Don’t switch of the power. During a period of frost all the radiators should be partly or totally
opened to avoid danger of freezing.
The integrated pump control wil activate the pump every 24 hours during a short period even if no
demand is present.This prevents the pump jamming. Only when work on the boiler is carried out may
the main electricity supply and the gas supply be turned off (your installer can show where these are
located).
Errors
If an error occurs rst check the following
• Is the room thermostat properly set?
• Is the boiler connected to the main? Power supply present?
• Is the gas valve opened?
• Are the radiator valves open?
• Is the waterpressure in the installation higher than 1 bar?
• Is the Installation bled thoroughly?
An error is indicated by a ashing code on the display. It is very important for the sake of a correct
diagnosis to mention this ashing code when calling your installer. Reset the burner controller by
pressing the OK button on the control panel. If the error more often occurs contact your installer.
Maintenance
A yearly inspection of the boiler to be done by your installer is necessary. The life-time and the reliability
of the installation are improved by doing so.The casing of the boiler can be cleaned with a soft cloth (no
abrasives). Never use solvents like thinner!
Caution
The air supply (for air needed for combustion) and the ue parts are essential parts for safe and efcient
functioning of the boiler. Changes on these systems by non qualied persons are not allowed just like the
settings of the gasvalve.The gas/air ratio is set to a lambda value of approximately 1.26.This corresponds
with a CO2 level of 9,3 % (full load).
For further information see installation manual.
The information in this document is subject to change without notice.The most recent version of this
manual is always available at www.markclimate.com/downloads.

4

5
EN
1 DESCRIPTION BOILER
1 Manometer
2 Display LCD
3 Power switch
4 Fuse
5 Burnerhood
6 Sight glass
7 Flow NTC
8 Ignition electrode
9 Ionisation ame detector
10 Inspection cover

6
11 Air supply
12 Gas pipe
13 Air intake silencer
14 Overheat limiter
15 Gas valve
16 Fan
17 Flow
18 Flue gas NTC
19 Return
20 Exhaust

7
EN
21 Syphon
22 Sump inspection cover
23 Return NTC
24 Fill and drain valve
25 Water pressure switch
26 Automatic air vent
27 Venturi
28 Boiler controller (Maxsys)
29 Terminal strip
30 Air pressure switch
31 Syphon pressure switch

8
2 TECHNICAL DATA
340-5 425-6 510-7 595-8
Central heating
Nominal input max load (Hi) kW 340 425 510 595
Nominal input min load (Hi) kW 68 85 102 119
Nominal output max load 80-60 ºC kW 331 413,1 495,7 578,3
Nominal output min load 80-60 ºC kW 66 82,5 99 115,6
Efciency max load 80-60 ºC (Hi) % 97,2 97,2 97,2 97,2
Efciency min load 80-60 ºC (Hi) % 97 97 97 97
Efciency max load 50-30 ºC (Hi) % 103,1 103,1 103,1 103,1
Efciency 30% load 30 ºC (return) (Hi) %108,1 108,1 108,1 108,1
Flue gas
Temperature ue-gas max load 80-60 ºC ºC 65-70 65-70 65-70 65-70
Temperature ue-gas min load 80-60 ºC ºC 60-65 60-65 60-65 60-65
Flow ue-gasses at max load G25 m3/h 556 695 835 974
Flow ue-gasses at min load G25 m3/h 111 139 167 195
Maximum ue-resistance Pa 250 250 300 300
Emission CO (n=1) ppm 116 110 100 90
Emission NOx (n=1)/Nox class ppm 27/class 6 27/class 6 27/class 6 27/class 6
Types B23, B33, C13, C33, C43, C53, C63, C83 yes yes yes yes
Gas
Gasow max load G25 m3/h 41,8 52,3 62,8 73,2
Gasow min load G25 m3/h 8,4 10,5 12,6 14,6
Gas ow max load G25.3 m3/h 39,94 49,93 59,92 69,91
Gas ow min load G25.3 m3/h 7,99 9,98 11,98 13,98
Gasow max load G20 m3/h 36 45 54 63
Gasow min load G20 m3/h 7,2 9 10,8 12,6
CO2content max load G25/G20 /G25.3 % 9,3 9,3 9,3 9,3
CO2content min load G25/G20 /G25.3 % 9,1 9,1 9,1 9,1
O2content max load G25 % 3,90 +0,10-0,30 3,90 +0,10-0,30 3,90 +0,10-0,30 3,90 +0,10-0,30
O2content min load G25 % 4,30 +0,35-0,20 4,30 +0,35-0,20 4,30 +0,35-0,20 4,30 +0,35-0,20
O2content max load G25.3 % 3,95 +0,10-0,35 3,95 +0,10-0,35 3,95 +0,10-0,35 3,95 +0,10-0,35
O2content min load G25.3 % 4,35 +0,35-0,25 4,35 +0,35-0,25 4,35 +0,35-0,25 4,35 +0,35-0,25
O2content max load G20 % 4,25 +0,10-0,35 4,25 +0,10-0,35 4,25 +0,10-0,35 4,25 +0,10-0,35
O2content min load G20 % 4,60 +0,40-0,20 4,60 +0,40-0,20 4,60 +0,40-0,20 4,60 +0,40-0,20
Water
Maximum ow temperature ºC 85 85 85 85
Content heat-exchanger (without manifolds) ltr 36,2 43,7 51,1 58,5
Minimum/maximum operating pressure bar 0,8/6 0,8/6 0,8/6 0,8/6
Hydraulic resistance mbar 200 210 220 230
(DT20 nominal ow at full load 80-60 ºC)
Maximum DT max load/min load ºC 25/35 25/35 25/35 25/35
Maximum waterow m3/h 28,5 35,6 42,7 49,8
Weight
Mass of heat exchanger with manifolds and
sump
kg 150 180 215 245
Total weight boiler kg 330 365 429 464

9
EN
Sizes of casing
Width mm 700 700 700 700
Depth without exhaust connection mm 1222 1222 1553 1553
Height with wheels (without) mm 1540 (1431) 1540 (1431) 1540 (1431) 1540 (1431)
Electrical
Protection IP 00B 00B 00B 00B
Supply life+neutral V/Hz 230/50 230/50 230/50 230/50
Standby power consumption* W 21 21 36 36
Min load powerconsumption* W 78 78 105 105
Max load power consumption* W 587 587 874 874
Maximum allowable power consumption W 2300 2300 2300 2300
Fuse A 10 10 10 10
* as coming from factory without extra devices connected
2.1 Component Matrix
Overview of main components used in PowerFlex-series
Part 340-5 425-6 510-7 595-8
Boiler control Honeywell Maxsys S4966V2052 S4966V2052 S4966V2052 S4966V2052
Display (user interface) DSP 49G2193 DSP 49G2193 DSP 49G2193 DSP 49G2193
Fan MVL 230VAC G3G200-GN20-30 G3G200-GN20-30 G3G250-GN17-01 G3G250-GN17-01
Gas-valve Dungs 230 VAC MBC-700-SE-S02 MBC-700-SE-S02 MBC-700-SE-S02 MBC-700-SE-S02
Venturi Honeywell VMU500A VMU500A VMU680 VMU680
Texi Burner round 130 mm Worgas 433 529 623 718
Silencer air-inlet yes
Silencer ue-gas round 250 mm L=300mm yes double yes single yes single yes single
NTC 12 k L=50 3 3 3 3
NTC 12 k OTC optional optional optional optional
Water low pressure device 1,6/0,8 bar yes yes yes yes
Pressure difference switch 40 Pa in and 25 Pa
out
yes yes yes yes
Syphon pressure difference switch 12,4 mbar out yes yes yes yes
Gas pressure switch : in 11,7-14,3 and out 8,6-
11,4 mbar
yes yes yes yes

10
3 DIMENSIONS

11
EN
The appliance is not to be used by children or persons with reduced physical, sensory or
mental capabilities, or lack of experience and knowledge.
Children, even if being supervised, must not play with the appliance.
In the case of failure or malfunction of the appliance, do not attempt to repair it yourself.
Please contact your installer. Repairs must only be carried out by qualied technicians.
Failure to comply with these requirements can compromise the safety of the appliance.

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4 OPERATION
4.1 General
The PowerFlex is a oor standing boiler, equipped with a cast aluminium heat-exchanger. During heat
demand the controller activates the pump.The controller checks the air pressure switch (zero check)
and increases the fan speed to perform an airow-check. Once the air pressure switch closes the fan
speed increases to ignition speed and a 30 second pre-purge is performed.The water pressure sensor,
gas pressure switch and siphon pressure switch are checked.When all pressure switches are closed and
the water pressure is ok, the ignition is started.
The air needed for combustion is taken in from the outside (if room sealed) or the boiler house (type
B ue installation) by the fan. The air is transported through a gas/air mixing device creating a negative
pressure.This negative pressure is an indication of the amount of air being transported.The negative
pressure is supplied to the gas-valve by an internal tube.The gas valve automatically adjusts the amount
of gas that will be injected into the venturi and that will be mixed with the air-ow. This mixture is
supplied to the burner.
Ignition and ame-control of the mixture is done by two electrodes mounted on the burner hood.
Temperature control and safeguarding is done using 2 NTC’s. The boiler monitors the sensors
continuously in order to control operation and ensure safe operation.
4.2 Central Heating (CH)
4.2.1 On-off room thermostat
As standard the boiler is programmed for using an on-off room thermostat.The room thermostat has to
be connected to the pin nrs. 1+ 2 on the terminal strip. Open Therm will berecognized if connected on 1
+ 2. The desired ow temperature is adjustable, but as standard is set to 85 °C.
At CH heat request from the roomthermostat (and no DHW heat request present) the CH-pump
is activated after 10seconds. The controller will adjust the burner-input in such a way that a ow-
temperature of 85 °C towards the CH-circuit is achieved.
Warning: do not supply any voltage to these terminals as you may damage the controller
4.2.2 Optional 0-10V
The boiler may be controlled using a 0-10V DC signal. Connect the negative (0V DC) to No. 3, and the
positive (0-10V DC) to No.4 on terminal strip C2.
A loop of wire must be placed between the pin nrs. 1 and 2 of terminal strip C2.
In the technician menu, enable 0-10V in the advanced CH settings menu by setting, CH request to either
0-10V DC % or 0-10V DC SP.
4.2.2.1 0-10Vdc % power control
A value between 2 and 10Vdc generates a CH power demand proportional to this value between 0 and
100% (0% = minimum load, 100% = nominal load).The heat demand is removed when the control signal
falls below 1 volt. The setpoint of maximum ow temperature is set to 90°C.
In the user/technician menu , diagnostics, boiler information the actual voltage input and target power
are being displayed.
4.2.2.2 0-10Vdc Setpoint
A value between 2 and 10Vdc generates a CH setpoint demand proportional to this value between CH
minimum ow temperature and maximum CH ow temperature. The heat demand is removed when the
control signal falls below 1 volt.
The minimum and maximum CH ow temperature can be set in the technician menu, advanced CH
settings, CH temperatures.

13
EN
Technician menu ----> 1 advanced settings ----> 2 CH temperatures ----> 1 absolute max. temperature
Setting higher than 90 degrees is not allowed
In the user/technician menu , diagnostics, boiler information the actual voltage input and boiler setpoint
are being displayed.
Caution: Ensure that the 0-10V DC signal is free from electrical interference!
4.2.3 Outside Temperature Control OTC (optional)
The boiler may use an outdoor sensor to provide weather compensation (OTC).
To activate weather compensation, connect an outdoor sensor to numbers 5 and 6 on the terminal strip
C2. Pin numbers 1 and 2 have to be bridged by a wire.Alternatively those pin numbers ( 1 and 2) can be
used for connecting room thermostat on/off. In the technician menu, advanced CH settings, CH request,
OTC only must be selected.The outdoor sensor is then automatically detected by the controller.The
parameters corresponding with A-E in the gure below can be set in the technician menu (advanced CH
settings).
A OTC offset: minimum CH setpoint value
B OTC setpoint maximum: maximum CH setpoint value
C OTC weather cold: external temperature value at which the maximum CH value will be used.
D OTC weather warm: external temperature value at which the minimum CH value will be used
E OTC warm weather shutdown: external temperature value at which the CH demand will end
In the user menu an eco setpoint reduction (night reduction) can be set.
A day, week and weekend will also be available (on , eco off)
The outdoor sensor is available as an optional accessory.
The sensor should be installed on the north-side of the building at a height of approximately 2 meters.
Notice : The resistance of the outdoor NTC should be 12 kOhm at 25 °C.
Also see table of resistance for NTC’s at 6.6.2 Optional digital communication
The boiler is also prepared for digital communication with room thermostats with
Open-Therm communication protocols (automatically recognised if connected to pins
1 + 2 on terminal strip C2, also see 4.2.1.

14
4.2.4 Optional digital communication
The boiler supports digital communication with room thermostats using Open-Therm communication
protocols (automatically recognised if connected to pins 1 + 2 on terminal strip C2, also see 4.2.1).
4.2.5 Slow start
The boiler uses a “slow start” procedure to prevent the boiler from supplying excessive
power in low load situations.
After “zero check” APS and closure APS with pre purge ignition starts. Following a
stabilization period, the boiler modulates down to low capacity and maintains this
capacity for 1 minute. Subsequently the boiler power increases at a rate of 4 °C/min
until maximum capacity or set temperature has been reached. Once heat demand has
nished the burner will turn off following a set post purge period.
The graph below illustrates this;
4.2.6 Protection against insufcient ow through boiler
If the requirements of 6.3.2 are fullled the boiler will protect itself against insufcient
ow. This is done by checking the difference in temperature between ow and return
(so called ∆T).
In a low ow scenario the ∆T will rise rapidly. The ∆T safe-guarding principle is as
follows;
At ∆T > 22 the boiler starts modulating
At ∆T between 22 and 27 the boiler continues modulating
At ∆T > 27 boiler the fan speed will be reduced until ∆T < 25

15
EN
4.3 Domestic Hot Water preparation (DHW)
4.3.1 External storage tank with thermostat (electric 3-way valve)
As standard the DHW conguration is factory pre-set for an external storage tank + tank thermostat.
For hydraulic connection of an external storage tank to the boiler via an electric 3-way valve one should
either use:
- the default conguration 2 pumps: 230 VAC DHW pump (terminal strip C1: 6,7,8) and CH pump (ter-
minal strip C1: 9,10,11)
- an electric 3-way valve with a maximum travel time of 255 sec. (terminal strip C1: 6,7,8,9). At the end of
the travel time in either direction DHW or CH the 230VAC on the 3-way valve will be switched off.
The 2 wires of the tank thermostat must be connected to numbers 7 and 8 on terminal strip C2.
In the case of using an electric 3-way valve adjust the setting in the technician menu, system settings,
boiler parameters, number of pumps to: pump and 3-way valve.
The 3-way valve travel time can be changed in the technician menu, system setting, boiler parameters,
3-way valve travel time.
4.3.2 External storage tank with NTC sensor
In case the storage tank is equipped with an NTC sensor, adjust setting in technician menu, advanced
DHW settings, DHW request to sensor.
Notice: The resistance of the NTC sensor must have a value of 12 kOhm at 25 °C.
The 2 wires of the tank NTC sensor need to be connected to numbers 7 and 8 on terminal strip C2.
The set point temperature of the storage tank is adjustable (default set at 60°C, the ow temperature is
DHW setpoint + 20K). Warning: if a CH heat demand exists immediately after nishing the heat request
for DHW, it is possible for high temperatures to ow into the CH system regardless of CH set point
(hot shot).
4.3.3 General behaviour with external storage tank (DHW priority)
Disabling warm water operation: press Summer-Winter button R2-C4(not active in main screen).
See later in manual for further explanation.
Enabling warm water operation: press Summer-Winter button R2-C4(active in main screen). See
later in manual for further explanation.
In the default boiler conguration, meaning 2 pumps (DHW and CH pump), a DHW request has priority
over CH request.
In the technician menu, advanced DHW settings, DHW priority, the DHW priority over CH can either
be disabled or a maximum DHW priority time may be set.
In case the DHW priority is disabled and both demands are active at the same, both pumps (CH and
DHW) will be activated. During this time the ow temperature is set to either 80 °C (thermostat) or
DHW setpoint + 20K (NTC sensor).
Notice: At outputs ≥ 40 kW double separation between exchanging media is required.

16
4.4 Cascade
For cascade application see document 0660470 Appendix B: Cascade

17
EN
5 BOILER CONTROL
5.1 Control Panel
The control panel has 12 buttons and a display as shown in the gure below.
5.2 Push buttons on control panel
R1-C1, R2-C1 and R3-C1 (back) buttons follow, if pressed, the associated icon in the display (left)
R1-C2 and R3-C2 (up-down) buttons, scroll, if pressed, through the different menus
R2-C2 button conrms, if pressed, the highlighted selection, or conrms what is required by LCD
R1-C3 button (escape) returns, if pressed to main screen
R1-C4 (on-off) button puts boiler in off mode, main logo and date/time stay displayed
R2-C3 (menu) button enables if pressed, access to both user and installer menu
R2-C4 (summer-winter) button enables-disables, if pressed, CH and DHW in main screens
R3-C3 (holiday) button enables, if pressed, holiday function in main screens
R3-C4 (eco) enables, if pressed, eco function in main screens
5 BOILER CONTROL
5.1 Control Panel
The control panel has 12 buttons and a display as shown in the figure below.
5.2 Push buttons on control panel
Description of push button use
5 BOILER CONTROL
5.1 Control Panel
The control panel has 12 buttons and a display as shown in the figure below.
5.2 Push buttons on control panel
Description of push button use

18
5.3 User menu
By pressing the “menu-button” the display will show the text as given in the gure below.
5.3 User menu
By pressing the “menu-button” the display will show the text as given in the figure
below.
By pressing the button right to “3” (R1-C1 see 5.2) the user menu is accessed.
Pressing the button right to “5” (R3-C1 see 5.2) returns back to general indication.
By pressing the button right to “4” (R1-C2 see 5.2) the installer menu is accessed.
In the user menu the following possibilities will be shown :
1. HEATING
2. DOMESTIC HOT WATER
3. HOLIDAY
4. MAINTENANCE
5. SETTINGS
6. DIAGNOSTICS
By pressing up and down (R1-C2 and R3-C2) 1 of the 6 options as shown above will
be highlighted. By pressing the ok button (R2-C2) the chosen option will be confirmed.
Once an option has been chosen it is possible to change the parameters
corresponding with the chosen option
5.3.1 Parameter/value setting
By pressing up and down (R1-C2 and R3-C2) buttons the desired parameter will be
highlighted. By pressing the ok button (R2-C2) the chosen parameter will be ready for
changing
The figure as shown beneath will appear
By pressing the button right to “3” (R1-C1 see 5.2) the user menu is accessed.
Pressing the button right to “5” (R3-C1 see 5.2) returns to the main screen.
By pressing the button right to “4” (R1-C2 see 5.2) the installer menu is accessed.
In the user menu the following possibilities will be shown:
1. HEATING
2. DOMESTIC HOT WATER
3. HOLIDAY
4. MAINTENANCE
5. SETTINGS
6. CHIMNEY-SWEEPER
7. DIAGNOSTICS
By pressing up and down (R1-C2 and R3-C2) 1 of the 7 options as shown above will be highlighted. By
pressing the ok button (R2-C2) the chosen option will be conrmed. Once an option has been selected
it is possible to change the parameters corresponding with the chosen option.
5.3.1 Parameter/value setting
Pressing the up and down (R1-C2 and R3-C2) buttons will highlight the desired
parameter. Pressing the OK button (R2-C2) will allow the chosen parameter to be
modied.
The gure as shown on the next page will appear

19
EN
The actual value can be changed by pressing the R1-C1 and R2-C1 buttons.
The changed value can be confirmed by pressing the ok (R2-C2) button
Pressing the back (R3-C1) button leaves the actual displayed parameter.
If there are more parameters shown in the parameter value area (4) the desired
parameter can be selected by pressing the up and down ((R1-C2 and R3-C2) buttons.
5.3.2 Parameters accessible by user
An overview of the parameters accessible by the user is given on the next page
The actual value can be changed by pressing the R1-C1 and R2-C1 buttons.
The changed value can be conrmed by pressing the ok (R2-C2) button.
Pressing the back (R3-C1) button leaves the actual displayed parameter.
If there are more parameters shown in the parameter value area (4) the desired parameter can be
selected by pressing the up and down ((R1-C2 and R3-C2) buttons.
5.3.2 Parameters accessible by user
An overview of the parameters accessible by the user is given on the next page.

20
User menu Submenu 1 Submenu 2 Submenu 3 Notes 1. HEATING Heating user settings
1. CH temperature/OTC set Set the CH temperatures and OTC curves parameters
1. CH setpoint Adjust setpoint of CH circuit 2. Outside temperature for CH off Set the external temperature at which heat demand is removed. If set OFF, heat demand will never
be removed.by controller (Only by removing RT or bridge between terminal strip C2:1,2)
2. Eco setpoint reduction Set the temperature that will be substracted from actual setpoint when ECO mode is activated 3. Scheduler set Invoke scheduler menu
1. Enable/disable on board scheduler Based on selection is possible to enable/disable on board scheduler
Enable Enable on board scheduler Disable Disable on board scheduler
2. Scheduler set Select to set scheduler
1 Monday 2 Tuesday 3 Wednesday 4 Thursday 5 Friday 6 Saturday 7 Sunday 8 Monday - Friday 9 Monday - Sunday 10 Saturday - Sunday
Used to program on board scheduler (On, Off , Eco) 2 Domestic
2. DOMESTIC HOT WATER
Domestic hot water user settings
1. DHW setpoint Set the DHW temperature (in case of a DHW with sensor this is the actual DHW temperature,
in case of DHW with thermostat this is the base boiler ow temperature)
2. Eco setpoint reduction Set the temperature that will be substracted from actual setpoint when ECO mode is activated 3. Scheduler set Invoke scheduler menu
1. Enable/disable on board scheduler Based on selection possible to enable/disable DHW on board scheduler
Enable Enable on board scheduler Disable Disable on board scheduler
2. Scheduler set Select to set scheduler
1 Monday 2 Tuesday 3 Wednesday 4 Thursday 5 Friday 6 Saturday 7 Sunday 8 Monday - Friday 9 Monday - Sunday 10 Saturday - Sunday
Used to program on board scheduler (On, Off , Eco) 2 Domestic
3. HOLIDAY Holiday temperature settings
1. CH holiday setpoint Set CH ow temperature used when Holiday active 2. DHW setpoint Set DHW temperature used during holiday mode