Hoval UltraOil 35 User manual

Operating Instructions
EN
4 204 075 / 02 - 08/08 Subject to modifications
Hoval United Kingdom
Hoval LTD
Northgate
Newark
Nottinghamshire NG24 1JN
Phone: [phone]
Fax: [phone]
Hoval Export
Hovalwerk AG
Austrasse 70
9490 Vaduz
Principality of Liechtenstein
Phone: [phone]
Fax: [phone]
This appliance is
only suitable for
operation with
heating oil EL
(low sulphur)
Condensing oil-fired boiler
UltraOil®(35,50)

Table of contents
1. For optimum use of the heating system, read the operating instructions! .................4
1.1 Important addresses and telephone numbers ................................................................................4
1.2 Key to symbols used .........................................................................................................................4
1.3 System data........................................................................................................................................5
1.4 Basis of calculations .........................................................................................................................5
1.5 Burner setting ....................................................................................................................................6
2. Safety information .............................................................................................................7
2.1 Intended purpose ..............................................................................................................................7
3. Customer service ..............................................................................................................8
4. Functional principle of the heating system ...............................................................9-10
5. System start-up ...............................................................................................................11
5.1 Checks to be made before operation .............................................................................................11
5.2 Switching on.....................................................................................................................................11
6. Heating system control...................................................................................................12
6.1 What is the function of the heating controller TopTronic®T.........................................................12
6.2 How you can save energy ...............................................................................................................12
6.3 Basic display ....................................................................................................................................12
6.4 Operating and display elements.....................................................................................................13
6.4.1 Function of the operating elements..................................................................................................................... 13
6.4.2 Basic procedure for changing settings ................................................................................................................ 13
6.4.3 What to do if... .................................................................................................................................................. 14
6.4.4 Control elements on the boiler control panel..................................................................................................15-16
6.5 Main settings ....................................................................................................................................17
6.5.1 Changing the room temperature - Day................................................................................................................ 17
6.5.2 Changing the room temperature - Night.............................................................................................................. 18
6.6 Operating modes .............................................................................................................................19
6.6.1 Operating mode functions ................................................................................................................................... 19
6.6.2 Operating modes for holiday and absence?........................................................................................................ 20
6.6.3 Changing the operating mode - for "HOLIDAY TIL", "ABSENT TIL" and "PARTY TIL"........................................ 21
6.6.4 Changing the operating mode - for "AUTOMATIC", "SUMMER", "HEATING", "RED. HEATING"
and "STANDBY" .................................................................................................................................................. 22
6.7 Switching times (heating times) .....................................................................................................23
6.7.1 Standard heating times ....................................................................................................................................... 23
6.7.2 Table for recording individual switching times ..................................................................................................... 23
6.7.3 Changing the switching times (heating times)................................................................................................ 24-26
6.7.4 Copying switching times................................................................................................................................. 27-28
6.8 Heating curve ...................................................................................................................................29
6.8.1 Heating curve (heating characteristic) information.............................................................................................. 29
6.8.2 Changing the heating curve (heating characteristic)...................................................................................... 30-31
6.9 Domestic hot water..........................................................................................................................31
6.9.1 Adjusting the domestic hot water temperature .................................................................................................. 31
6.9.2 Manual hot water loading ................................................................................................................................. 32
6.9.3 Domestic hot water economy temperature (reduced temperature)................................................................ 33-34
6.10 Further settings.............................................................................................................................35
6.10.1 Setting the clock.................................................................................................................................................. 35
6.10.2 Setting the date ................................................................................................................................................... 36
6.10.3 Changing between summer and winter time....................................................................................................... 36
6.10.4 Setting the language ........................................................................................................................................... 37
6.10.5 Reloading the standard switching times program - Deleting the own time program ...................................... 38-39
6.10.6 Manual operating mode (in case of faults) .......................................................................................................... 40
6.10.7 Alarms ................................................................................................................................................................. 41
6.10.8 Changing the maximum boiler temperature ................................................................................................... 42-43
6.11 System information..........................................................................................................................44
6.11.1 Information key for system temperatures and heating circuit information ........................................................... 44
6.11.2 Special symbols .................................................................................................................................................. 45
6.11.3 Optional accessories........................................................................................................................................... 45
7. Oil tank and burner .........................................................................................................46
7.1 Fuel....................................................................................................................................................46
7.2 Filling the oil tank ............................................................................................................................46
7.3 Burner setting ..................................................................................................................................46
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Table of contents
7.4 Boiler-room and supply of fresh air ...............................................................................................46
7.5 Putting into service..........................................................................................................................46
7.6 Taking out of service .......................................................................................................................46
7.7 Maintenance, burner ........................................................................................................................46
8. Maintenance, controls................................................................................................47-48
9. Check list in case of faults .............................................................................................49
10. How you can save energy...............................................................................................50
11. Hoval Service / Sales program .......................................................................................51
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Operating instructions
1. For optimum use of the heating system, read the operating instructions!
These instructions will provide you with all the information you need for an
optimal use of your heating system.
An optimally adjusted heating system can not only save you a lot of grief, but
also a lot of money.
1.1 Important addresses and telephone numbers
Heating installer: ......................................................................
......................................................................
Plumbing installer: ......................................................................
......................................................................
Electrical installer: ......................................................................
......................................................................
Chimney inspector: ......................................................................
......................................................................
Fuel supplier: ......................................................................
......................................................................
Oil burner service: ......................................................................
......................................................................
Tank cleaning: ......................................................................
......................................................................
1.2 Key to symbols used
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Instruction: Prompts you to carry out an action
Result: Shows the expected reaction to your action
Note: Provides important information
Safety information: Indicates an immediate hazard to persons
Warning information: Indicates danger to machines and installations
Energy saving tip: Provides energy saving information
ENERGY
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Operating instructions
1.3 System data
To be completed by the heating installation engineer
Order no.: .....................................................................
Year of manufacture: .....................................................................
Heating boiler UltraOil® type:..................................................................
Boiler nominal output ......................................................................
Heating pump type: .....................................................................
Heating regulator type: .....................................................................
Mixer component type: .....................................................................
Water heater type: .....................................................................
Hot water sensor Yes No
Thermostat Yes No
Outside temperature sensor Yes No
Room temperature sensor Yes No
Number of heating circuits: 1 2
3 4
Heating circuit HC = .....................................................................
Heating circuit MC1 = .....................................................................
Heating circuit MC2 = .....................................................................
Heating curve value HC = ....................................................................
Heating curve value MC1 = ..................................................................
Heating curve value MC2 = ...................................................................
1.4 Basis of calculations
To be completed by the heating installation engineer.
Lowest outdoor temperature:................................................................ °C
Heat demand: .................................................................... kW
Max. flow temperature: .................................................................... °C
Max. return flow temperature:............................................................... °C
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Operating instructions
1.5 Burner setting
To be completed by the firing operative
Firing output setting
Burner: min. ................. kW
max. ................. kW
Exhaust gases: ................. °C
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Safety information
2. Safety information
In the event of danger!
Interrupt the flow of fuel (oil) and cut off the power supply
If you smell exhaust gas!
Switch the system off
Open all windows and doors
Notify a specialist heating firm
Fresh air supply
Keep fresh air supply openings open: fresh and exhaust air openings must not be
closed. Closure of fresh air supply openings may lead to incomplete combustion
and in turn to the production of poisonous gases.
This does not apply if your system is operated independent of boiler room air – see
Page 4
Commissioning of a newly installed system may only be carried out by a qualified in-
staller. The installation control must be completed prior to commissioning -see chapter
5.
Safety precautions
Check the water level - see page 47
Always keep the room in which your boiler is installed clean, and before cleaning it,
switch off the burner as combustion air containing dust may lead to faults.
Corrosion protection
Do not use sprays, solvents, cleaning agents containing chlorine, paints, varnishes or
adhesives in the vicinity of the boiler. These materials may in certain circumstances
lead to corrosion in the boiler and exhaust gas system.
2.1 Intended use
Purpose:
The UltraOil®heating boiler must only be operated with the fuels specified in the tech-
nical information / Installation instructions.
The heat generated must be dispersed by means of heating water. All openings in the
boiler must be locked while it is in operation.
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Customer service
You should read these instructions thoroughly before the system is commissioned!
Dear customer,
With the Hoval UltraOil®you have acquired a product manufactured according to the
state-of-the-art and highest quality standards.
Please ensure that the delivery is consistent with your order and check it is complete.
Also check for possible damage in transit and inform the nearest Customer Service
centre if there is any. For insurance reasons it will not be possible to accept any
subsequent claims.
For the correct installation and operation of your Hoval UltraOil®, all applicable laws,
regulations and standards must be complied with; in particular the regulations of the
respective energy supply company. In case of queries, please contact your specialist
installer or the nearest Hoval Customer Service centre.
Assembly or installation of the heating boiler may only be carried out by trained
personnel of an approved installation company. Before starting the boiler for the first
time, an installation inspection and approval of the overall installation by the installer
are required.
To guarantee safe and trouble-free operation, operate your Hoval boiler only accord-
ing to these operating instructions.
The boiler may only be used for its intended purpose and fuels for which it is suitable
on the basis of its design and for which it has been approved by Hoval.
Do not carry out any changes to the system, otherwise all claims under the guarantee
will be invalidated. Conversion kits are to be installed and the installation approved
by authorised installers or by the Hoval Customer Service.
The reliable and safe functioning of a oil boiler, as well as the achievement of an
optimal effectiveness and clean combustion are only possible and guaranteed if the
system is maintained and cleaned at least once every year.
In the event of a fault or in case of damage, please contact the Hoval Customer
Service to inquire about the necessary repairs. In the meantime, shut down the unit
to avoid any damage.
With the acquisition of a Hoval unit you also obtain a comprehensive guarantee
protection, as indicated in the guarantee conditions of the guarantee pass for your
unit.
This guarantee is, however, dependent on the observance of the operating and instal-
lation instructions and on compliance with the applicable legal regulations. Non-com-
pliance with the above will invalidate all liability and warranty claims against Hoval.
Provided it is used correctly, your Hoval boiler will ensure you enjoy a well heated
home for many years.
The Hoval Customer Service
If you have any doubts in regard to the operation of your Hoval boiler, or minor faults
affect its correct functioning, please contact the nearest Hoval Customer Service
centre. A telephone call is often enough when it comes to solving small problems.
Our trained Customer Service staff will do everything in their hands to help you.
If a fault can not be solved in this way, a service technician will visit you in order to
solve the problem. We hope you understand that, except in urgent cases, this is not
always immediately possible.
Take advantage of the offer of the Hoval Customer Services for extending the service
life of your Hoval boiler, and ask for a service agreement. Your Customer Services
advisor will be pleased to give you information.
You will find the addresses on the last page.
3. Customer service
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Functional principle of the heating system
4. Functional principle of the heating system
Function:
Burns oil safely and in an eco-friendly manner.
Takes the heat generated by the combustion from the
exhaust gases and transfers it to the heating water.
The energy in the heating oil is converted by com-
bustion in the heating boiler into heat.
It holds a reserve of domestic hot water for consump-
tion (e.g. for showering).
Controls and monitors operation of the heating boiler.
Ensures that, whatever the temperature outside, the
room temperature is as required – in an optimum and
fuel-
efficient manner.
Delivers the heat from the heating water to the room.
Transports the heating water from the heating boiler
to the radiators and back again to the heating boiler,
where it is reheated.
Convey the heat generated from the heating boiler to
the radiators.
Modifies the feedwater temperature (water being fed
into the radiator) so that irrespective of the outside
temperature the desired room temperature is at-
tained. This is achieved by the addition of a proporti-
on of cooler water from the heating return circuit.
Indicates the water pressure in the heating system.
Component
Oil
heating boiler
Oil
Storage
water heater
Boiler control/
regulation
Radiators,
underfloor heating
where fitted
Heating pump
Hot water and
hot water pipes
Mixer valve
Manometer
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Functional principle of the heating system
Makes sure that only heating water is in the hot wa-
ter pipes, and no air.
Prevents pressure in the system becoming exces-
sive.
Keeps the pressure in the system constant and acts
as a reservoir for the expansion water.
Vent
Safety valve
Membrane expansion
vessel
Depending on the working principle of the heating system selected, there may be extra components or
some may not be provided. Have your system explained in detail by the specialist.
The hot water heated by the heating boiler is conveyed to the radiators, or is used to heat the domestic
hot water in the water heater.
Radiator(s) or
underfloor he-
ating
Heating pump
Heating boiler
Mixer valve
Water
heater
Chimney, flue
system
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System start-up
5. System start-up
For a new installation, the first commissioning may only carried out by a spe-
cialist. The installation checks must be carried out completely.
- Set the main SYSTEM switch to “0”.
- Open the shut-off valves in the flow and return lines.
- With the UltraOil
®
fill the odour trap (siphon) in the condensate drain pipe
with water before starting up the system.
5.1 Checks to be made before operation
Check the water level in the heating system.
The heating system must be filled with water and all the air removed.
Observe the regulations regarding antifreeze and water treatment.
Open the shut-off valves in the flow and return lines.
Check the fresh air supply to the heating system.
Check the settings for the operating modes.
5.2 Switching on
Switch on the main switch.
Set the boiler control unit to the desired operating mode and temperature.
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Heating system control
6. Heating system control
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ENERGY
6.1 What is the function of the heating controller TopTronic®T
The boiler controller is, in conjunction with the temperature sensor connected to
it, so to speak, the brain of the heating system.
Its main functions are:
- maintaining the desired room temperature independently of the outdoor tem-
perature
- heating the living space when required
- producing warm water (e.g. for showering) only when required
- displaying information
Further functions:
- Input of desired temperatures and operating modes
- Turn the burner ON/OFF
- Temperature monitor
The correct settings for the heating system have already been applied by Hoval,
or the installer, during commissioning. Any changes to those settings should only
be carried out if you go away on a trip or if your home is to cold or too warm. An
overview of the most frequent questions/answers can be found on pages 14 and
19 of these instructions.
6.2 How you can save energy
For your benefit and for the environment
Using energy more efficiently by avoiding unnecessary losses:
With little effort you can optimise the operation of your system and make it worth
while.
- You can save money. So much money in fact, that every sixth year, the amount
saved will cover you bill for heating oil.
-Every year you can save as much energy as is equivalent to the output of a
whole bath full of heating oil.
In autumn, it is worth while turning the heating off again on warm days
This prevents the heating system from producing unnecessary heat in the morn-
ing, due to low outdoor temperatures, and overheating the house. Turning the
heating on or off depending on the weather conditions is one of the most effective
energy saving measures. If you want to save yourself going down the basement,
you may want to consider acquiring a “remote control” from Hoval, which will allow
you to operate and control the heating comfortably from your living room.
6.3 Basic display
The basic display shows the day of the week, date and time of the day, as well
as the current boiler temperature and room temperature (room station).
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Heating system control
6.4 Operating and display elements
6.4.1 Function of the operating elements
The central rotary pushbutton and the labelled keys are designed for easy
and straightforward operation.
Rotary pushbutton:
Change and store
values
6.4.2 Basic procedure for changing settings
An example
Select the desired function
Turn the rotary pushbutton to se-
lect or change the desired para-
meter (flashing word or number)
Return to the basic display without
memorising the set value is pos-
sible at any time by pressing the
info key
Press the rotary pushbutton to
store the value set
It is also possible to store the value
using the selected function key
Function keys
Function keys
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Heating system control
Observation
It is too cold
It is too warm
From now on, equal day and
night temperatures should be
maintained continuously
This evening, the heating
should remain on for longer
A larger amount of hot water
is required
From now on, hot water but no
heating is required
Suddenly, there is no heating
or hot water; it is cold
The room temperature setpoint
requires frequent adjustments
because it is too cold or too
hot
Today, I will be absent for sev-
eral hours during the day
I am travelling for a short pe-
riod of time (e.g. 3 days)
I will be travelling for an indefi-
nite period of time
In summer, it is too cold or too
warm.
Remedy
Set a higher value for the room temperature with and the
rotary pushbutton (page 17).
Set a lower value for the room temperature with and the
rotary pushbutton (page 17).
Set the operating mode to “HEATING”  with
� � �
(page
22).
Set the operating mode to “PARTY” with
� � �
and set the
desired time (pages 19-21).
Press for 3 seconds and set the additional loading time (page
32).
Set operating mode to “SUMMER” with
� � �
(heating off, only hot water) (pages 19-22).
Check the boiler controller for alarms and consult a heating
engineer, if necessary. Check main switch (see page 13).
Change the set heating curve (page 29).
Changing the heating curve is not sensible if your system is
fitted with a room sensor (or room station) and an outdoor sen-
sor.The correct settings for the heating curve are then provided
automatically. Consult a specialist, if necessary.
Set the operating mode to “ABSENT TIL” with
� � �
and
set the return time (pages 19-22).
Set the operating mode to “HOLIDAY TIL” with
� � �
and
set the return date (page 20).
Set the operating mode to “RED. HEATING” with
� � �
.
When returning, set the operating mode to “AUTOMATIC” 
� � �
(page 20).
Indicates that the summer disconnection is active. If it is
too cold, set the operating mode to “HEATING” with
� � �
( page 17, 22).
6.4.3 What to do if...
The following information can be used as a first level support in frequently
occurring situations.
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Heating system control
1
2
34
5
10 11
6
7
13
9
812
14
15
6.4.4 Control elements on the boiler control panel
Key Designation Function
1
Main switch
I = ON - Boiler is in operation
0 = OFF - Boiler and burner are shut down
! Attention: No frost protection
2Daytime room temperature Set the daytime room temperature. Page 17
3Reduced room
temperature
Set the night time room temperature (reduced
heating). Page 18
4DHW temperature Set the domestic hot water temperature. Manual DHW
reloading. Page 31-32
5
Rotary pushbutton Change the values by turning. Confirm the values by
pressing. Function selection by pressing and turning.
6
Information key
• Show the operating data on the display.
• Return to the basic display without saving the values.
See example on page 44
7Heating curve set-up Set the heating characteristics Page 29
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Heating system control
Key Designation Function
8
Operating mode selection key Select the operating modes
 Holiday Turn off the heating system during the holidays (frost
protection) Page 19-21
 Absence Temporarily switch off heating Page 19-21
 Party Extended heating Page 19-21
 Automatic Automatic heating according to the preset heating
times = normal heating Page 19-21
 Summer only DHW; heating off Page 19-21

Constant heating
Constant heating mode Page 19-21

Reduced heating
Constant reduced heating mode Page 19-21
 Standby
System switched off - frost protection activated Page 19-21
9Manual mode /
emission measurement For heating technician only Page 40
10 Display The basic display shows the day of the week, date
and time of the day, as well as the current boiler tem-
perature and room temperature (room station).
Possible readouts:
1 Active heating time 24h
2 Weekday display
3 Display of the active operating mode and the clock
programme
4 Time of the day
5 Selected operating mode
6 Date / Day / Month / Year
7 Boiler temperature and room temperature
11 Control panel fuse
under the hinged cover
Check the 6.3 A fuse if the display 11 stays dark.
This should only be done by the heating technician!
12 Reset button under
the hinged cover
Press the Reset button under the hinged cover if the
display shows “Error”. If this happens frequently, notify
your Customer Service centre.
13 Brief operating instructions
on the hinged cover
Special brief operating instructions are provided with
the heating control.
14 Burner error lamp Press the Reset button (see no. 12).
15 Fault lamp / fault reset
“burner”
If despite pressing the “Fault reset” button, the burner
does not restart, notify your customer services.
2
1
3
4
6
7
5
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Heating system control
6.5 Main settings
6.5.1 Changing the room temperature
Setting the daytime room temperature
Start - Basic display
Tap the “Daytime room tempera-
ture” key.
The daytime room temperature set-
point flashes.
Set the desired room temperature
by turning the “rotary pushbutton”.
The new “Daytime room tempera-
ture” setpoint appears on the dis-
play.
Tap the “Daytime room tempera-
ture” key to confirm the tempera-
ture setpoint.
MO. 16. AUG.'04
14:00 62.5C
ROOM DAY
20.0C
ROOM DAY
22.0C
These adjustments can also be
carried out on a room station.
If “MC1” is shown on the display,
you need to select the heating cir-
cuit.
(Information on which heating cir-
cuit to select for your home can be
found on page 5 of these instruc-
tions).
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1
2
3
4
5
6
Setting range 5 - 30°C
(Factory setting 20°C)
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Heating system control
6.5.2 Setting the reduced (night time) temperature
MO. 16. AUG.'04
14:00 62.5C
ROOM NIGHT
20.0C
ROOM NIGHT
18.0C
1
2
3
4
5
6
Start - Basic display
Tap the “Reduced room tempera-
ture” key.
The night time room temperature
setpoint flashes.
Set the desired room temperature
by turning the “rotary pushbutton”.
The new “Reduced room tempera-
ture” setpoint appears on the dis-
play.
Tap the “Reduced room tempera-
ture” key to confirm the tempera-
ture setpoint.
If “MC1” is shown on the display,
you need to select the heating cir-
cuit.
(Information on which heating cir-
cuit to select for your home can be
found on page 4 of these instruc-
tions).
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Setting range 5 - 30°C
(Factory setting 16°C)
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Heating system control
Operating mode
HOLIDAY

ABSENT

PARTY

AUTOMATIC

SUMMER

HEATING

RED. HEATING

STANDBY

Function
- Heating system off during holidays.
- Room temperature set to minimum (10 °C).
- Water heater frost protected (5 °C).
- Heating system OFF.
(heating temporarily switched off until set
time).
- Room temperature set to minimum (10°C).
- Water heater frost protected (5 °C).
- Extend heating (daytime room temperature)
up to set day/night time (you do not want to
reduce the room temperature at the preset
time).
- Automatic heating mode according to the
heating times set in the 1.switching time pro-
gram = normal heating mode.
- Heating system OFF.
- DHW is produced at the times set in the swit-
ching time program (for showering, etc.)
- Frost protection active.
- The room temperature is not reduced during
the night.
- The rooms are continuously heated at the
set “daytime room temperature” .
- DHW mode according to switching program.
- The rooms are continuously heated at the
set “reduced room temperature” .
- Continuous reduced heating mode.
- Heating system OFF.
- Frost protection active.
- No DHW mode.
6.6 Operating modes
6.6.1 Operating mode functions
Application
You go on holiday for e.g. 1 week and you
know the return date.
Page 21
You leave home in the morning and come
back in the evening.
Page 21
You have guests in the evening.
Page 21
You want to heat as cost effectively and
efficiently as possible.
Page 22
Heating the rooms is unnecessary due to
the high outdoor temperatures.
Page 22
You prefer to heat the rooms during the
night as well.
Page 22
You are travelling for an indefinite period of
time.
Page 22
You are travelling for an indefinite period of
time in spring or in autumn. It does not mat-
ter if the rooms are cold on return.You need
warm water on return. Page 22
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End of holiday = Return date normal heating is resumed on the day of return!
Setting range: current date + 250 days.
To switch over to automatic mode prematurely
� � �
press the “operating mode” key for 3 sec.
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Setting range: 0.5 - 24 h.
To switch over to automatic mode prematurely - press the “operating mode” key
� � �
for 3 sec.
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Setting range: 0.5 - 24 h.
To switch over to automatic mode prematurely - press the “operating mode” key
� � �
for 3 sec.
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Factory setting:
Heating: 06.00 - 22.00
Reduced heating: 22.00 - 06.00
Domestic hot water: 05.00 - 22.00
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Factory setting for domestic hot water: 05.00 - 22.00
Operating mode “Summer” can not be selected if each heating circuit is adjusted separately.
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Heating system control
6.6.2 Operating modes for holiday and absence
Depending on the duration of your absence and what your requirements are in
regard to comfort, there are different operating modes available for interrupting or
reducing the heating. In any case you will be able to save a lot of energy and money
if the rooms are not heated or less heated during your absence.
The following table is intended as a guide for finding the best operating mode for
each particular case:
� � �
See following pages for a detailed description on how to set the operating modes.
You can return to the “AUTOMATIC” function (normal heating mode) at any time by “pressing”
� � �
for 3
sec.
Application
You go on holiday for e.g. 1
week and you know the return
date.
You leave home in the mor-
ning and come back late in
the evening.
You are travelling for an inde-
finite period of time and want
the living area to be at the set
reduced temperature on
return.
You are away for an indefinite
period of time during spring or
autumn and you don’t mind if
your home is cool on return.
Operating mode
"HOLIDAY TIL"

Heating system and DHW off
during holidays.
"ABSENT TIL"

Heating interrupted temporarily
"RED. HEATING"

Continuous reduced heating
mode
"STANDBY"

System switched off – frost
protection activated
Function
- Heating system OFF / Water
heater frost protected (5°C)
- Room temperature set to
minimum (10°C)
Setting range:
from the current date until 250
days ahead!
End of holiday = Return date.
Normal heating is resumed on
the day of return!
Early return:
"Press", for 3 sec. to return
to “AUTOMATIC” mode (see
page 19).
Heating temporarily interrupted
until set time.
Setting range: 0.5 - 24h
Continuous reduced heating
and DHW mode (reduced see
page 33) around the clock.
The entire heating system is
switched off and frost protected.
Water heater frost protected!
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