Webasto DUAL TOP RHA-100 User manual

Integrated Heater
09/2007
Operating Instructions
DUAL TOP
RHA-100

Fig. 1: Control Panel
1 234
B
C
5
7
6
A

Contents
1 Introduction..........................................................................1
2 Servicing and safety instructions......................................2
3 Function description...........................................................6
3.1. Summer mode (hot water only).............................................6
3.2. Winter mode (heating only) ...................................................7
3.3. Winter mode (heating and hot water)....................................7
4 Operating instructions........................................................9
4.1. General..................................................................................9
4.1.1. Control Panel.......................................................................10
4.1.2. Interior temperature sensor.................................................11
4.2. Normal operation.................................................................12
4.2.1. Summer mode
(hot sanitary water only)......................................................12
4.2.2. Winter mode
Heating without hot sanitary water production.....................13
4.2.3. Winter mode
Heating with hot sanitary water production..........................14

Contents
4.3. Frost.................................................................................... 16
4.3.1. Draining the boiler manually................................................ 17
4.3.2. Draining the boiler automatically......................................... 19
4.3.3. Frost protection mode ......................................................... 21
4.4. Switching off ....................................................................... 22
5 Filling the boiler ................................................................ 23
6 Fault code .......................................................................... 24
7 Maintenance ...................................................................... 25
8 Troubleshooting................................................................ 27
9 Worldwide warranty.......................................................... 31

Contents

DUAL TOP RHA-100 Introduction
1
1 Introduction
Dear Customer,
Thank you for choosing the Webasto Dual Top RHA-100 integrated air and water heater system.
We hope that this product brings you years of reliable comfort and enjoyment during your travels.
The Dual Top RHA-100 heater has been designed as an integrated heating system to heat and to
provide hot sanitary water in motor homes. Please note that the Dual Top RHA 100 is only
specified for applications in motor homes or similar vehicles.
However, in order to fully understand all the heater's features, you must read these operating
instructions. If you do not understand any information in the manuals or if you misplace any of
them, please contact your authorised Webasto dealer immediately.
Please take the time to read and understand this material to help limit the possibility of serious
injury.
ALWAYS read and follow all instructions in this manual.
It is very important that an authorised Webasto dealer carries out any repair or maintenance,
which is not described in this manual.

Servicing and safety instructions DUAL TOP RHA-100
2
2 Servicing and safety instructions
1 The heater has been type-tested and approved in accordance with EC Directives 72/245/EEC
(EMC) and 2001/56/EC (heater) with the following EC permit numbers:
e1 00 0195
e1 03 5000
NOTE:
The provisions of these Directives are binding within the territory governed by EU
Directive 70/156/EEC and should similarly be observed in countries without specific
regulations.
2 The year in which the heater was used for the first time must be permanently displayed on the
identification plate by deleting the inapplicable years from the plate.
3 The heaters are not designed for heating hazardous substance transport compartments.
4 Warranty claims can only be made if it can be verified that the claimant has complied with the
servicing and safety instructions.
5 The heater must be switched off at filling stations and fuel storage areas as a result of the risk
of explosion.

DUAL TOP RHA-100 Servicing and safety instructions
3
6 The heater may not be operated in enclosed spaces (such as garages) as a result of the risk
of poisoning and asphyxiation.
7 To provide satisfactory service the heater should be inspected every two years, especially if
used for extended periods and/or extreme environments.
8 In the event of long-lasting heavy smoke development, unusual combustion noises or a smell
of fuel or if the heater suffers continuous fault cut-outs with error messages (flashing code), it
must be put out of service be removing the fuse and must not be reused until it has been
inspected by Webasto-trained personnel.
9 Wherever inflammable vapours or dust may form (for example in the vicinity of fuel, carbon,
wood dust or cereal stores or the like), the heater must be switched off as a result of the risk
of explosion.
WARNING:
Always switch off the heater before refuelling.
10 The heat transfer unit on air heaters is exposed to very high thermal stress and must be
replaced by a genuine Webasto spare part ten years after it is used for the first time.
WARNING:
Exhaust lines shall not pass through areas used by people.

Servicing and safety instructions DUAL TOP RHA-100
4
11 The diesel fuel specified by the vehicle manufacturer must be used for the Dual Top RHA-100
heater. Class EL heating oil, L heating oil and PME (bio-diesel) shall not be used.
We know of no negative influences due to additives.
If fuel is extracted from the vehicle's tank, follow the additive instructions issued by the vehicle
manufacturer.
If you change to low-temperature fuel, the heater must be operated for approx. 15 minutes so
that the fuel system is filled with the new fuel.
12 The temperature in the area around the heater must not exceed 85 °C (storage temperature).
13 Operation of the heater is only allowed under ambient temperatures between -40 and 50 °C.
14 Failure to follow the installation instructions and the notes contained therein will lead to all
liability being refused by Webasto. The same applies if repairs are carried out incorrectly or
with the use of parts other than genuine spare parts. This will result in the invalidation of the
type approval for the heater and therefore of its homologation / EC type licence.
15 Keepthe hot airinlet andhot air outletfreeof dirtandforeign bodies. Contaminatedor blocked
hot air lines may cause overheating and thus result in the overheating cut-out activation.
16 To prevent mechanical parts seizing, the heater should be operated for approx. 10 minutes
every four weeks.
17 Do not stand on the heater and do not place any heavy items on the heater or throw items at
the heater.

DUAL TOP RHA-100 Servicing and safety instructions
5
18 Do not place any items like clothing, textiles or similar materials over the heater or in front of
the hot air inlet and the hot air outlet.
19 The current of hot air in the heater must not be restricted or blocked by highly inflammable
substances or materials such as rags, cleaning wool, etc.
20 The heater must not be cleaned with a high pressure cleaner.
21 Take good care of the vehicle, empty the content of the water heater and all water lines when
there is a risk of frost.
There shall be no warranty claims for damage caused by frost!

Function description DUAL TOP RHA-100
6
3 Function description
The Webasto Dual Top RHA-100 integrated heater combines the benefits of an interior heater
with a sanitary water boiler and contributes to a gas-free camper.
Depending on what you wish to have, hot water in summer mode, just heat or heat and hot water
in winter mode, several options are available.
3.1. Summer mode (hot water only)
The heater is used for providing hot sanitary water. The water is heated up to and kept at 40°C or
70°C.
The device automatically selects the burner setting. A water temperature sensor controls the
water temperature. Due to variable operating and environmental influences, small water
temperature deviations are possible.
The hot interior air fan is not activated.

DUAL TOP RHA-100 Function description
7
3.2. Winter mode (heating only)
Thedesiredinterior temperaturecan be adjustedwiththe interior temperatureselector(5 ~ 35ºC).
The device automatically selects the burner setting modulating between 1,500 W and 6,000 W
depending on the output requirement (calculated from difference between selected temperature
and current interior temperature).
The amount of heat is regulated to quickly reach the pre-selected interior temperature. Then only
a limited amount of power is needed to hold the interior temperature.
Blown air heating is always possible with or without water in the boiler.
3.3. Winter mode (heating and hot water)
The heater is used for heating the interior and production of hot water.
The desired interior temperature can be adjusted with the interior temperature selector (5 ~ 35 ºC).
The water is heated up to 70°C.
The device automatically selects the burner setting modulating between 1,500 W and 6,000 W
depending on the output requirement (calculated from difference between selected temperature
and current interior temperature).
The amount of heat is regulated to quickly reach the pre-selected interior temperature. Then only
a limited amount of power is needed to hold the interior temperature.

Function description DUAL TOP RHA-100
8
A water temperature switch controls the water temperature, while an interior temperature sensor
controls the interior temperature.
Due to variable operating and environmental influences, small water temperature deviations are
possible.

DUAL TOP RHA-100 Operating instructions
9
4 Operating instructions
4.1. General
Always observe the operating instructions and "Servicing and safety instructions" prior to
starting!
The vehicle owner is responsible for the correct operation of the appliance.
Before using for the first time, it is essential to rinse the entire water supply system.
If the heater is not being used, always drain the water contents if there is a risk of frost!
Also drain the water prior to repair or maintenance work on the vehicle as the electrical drainage
valve may open when the appliance is switched off!

Operating instructions DUAL TOP RHA-100
10
4.1.1. Control Panel
Changes to the settings on the Control Panel are implemented after a short delay!
See Fig. 1.
A = Mode selector knob
B = Interior temperature selector
C =Power indicator / fault code display (green / red)
1 = Summer mode, water temperature 40 ºC
2 = Summer mode, water temperature 70 ºC
3 = Winter mode, heating only
4 = Winter mode, heating and hot sanitary water combined
5 = Frost protection mode
6 = Drainage
7 = Off

DUAL TOP RHA-100 Operating instructions
11
4.1.2. Interior temperature sensor
To measure the room temperature, a remote interior temperature sensor is located in the vehicle.
Thelocation of thesensoris determinedby the installer,depending onthe vehicle type andinterior
layout.
Note:
The remote interior temperature sensor must
be installed at medium height in the interior on
vertical surfaces.
Avoid that the interior temperature sensor is:
• in the direct current of hot air (from the
vehicle‘s own heating system or the hot air
heater);
• close to heat sources;
• placedindirectsunlight (for exampleonthe
dashboard);
• installed inside a locker;
• installed behind curtains or the like. Fig. 2: Interior temperature sensor

Operating instructions DUAL TOP RHA-100
12
4.2. Normal operation
4.2.1. Summer mode
(hot sanitary water only)
1 Make sure that the boiler is filled with water.
2 Set selector knob (A) to summer mode 40°C (1) or 70°C (2) at Control Panel.
The indicator (C) on the Control Panel lights green when the equipment is switched on.
The red indicator on the mode selector knob (A) illuminates.
When the selected water temperature has been reached (40°C or 70°C) combustion inside the
heater stops.
As soon as the water temperature has dropped below a certain value, the combustion is started
again.
The indicator (C) on the Control Panel lights green as long as the equipment is switched on.

DUAL TOP RHA-100 Operating instructions
13
4.2.2. Winter mode
Heating without hot sanitary water production
1 Move interior temperature selector (B) on the Control Panel to desired thermostat setting for
interior temperature.
2 Move mode selector knob (A) to winter mode, heating only (3) at Control Panel.
The indicator (C) on the Control Panel lights green when the equipment is switched on.
The red indicator on the mode selector knob (A) as well as on the interior temperature selector (B)
both illuminate.
When the selected interior temperature is approached, the heater starts to modulate. The power
is adjusted to a level necessary to maintain a constant temperature.
In case the interior temperature exceeds the selected temperature, due to environmental
influences, the combustion inside the heater stops.
Please note that, in case the boiler has been filled, the water is automatically heated as well. The
water temperature may reach up to 80°C depending on the power and the duration of the heating.

Operating instructions DUAL TOP RHA-100
14
4.2.3. Winter mode
Heating with hot sanitary water production
1 Make sure that the boiler is filled with water.
2 Move interior temperature selector (B) on the Control Panel to desired thermostat setting for
room temperature.
3 Move mode selector knob (A) to winter mode, heating and hot water (4) at Control Panel.
The indicator (C) on the Control Panel lights green when the equipment is switched on.
The red indicator on the mode selector knob (A) as well as on the interior temperature selector (B)
both illuminate.
The unit gradually reduces the power until the selected interior temperature is reached. If the
interior temperature has been reached, but the water temperature is still too low, the blown air
circulation fan switches off and the water continues to be heated to a temperature of 70°C.
The water temperature may reach up to 80°C depending on the heating power that is required to
achieve the interior temperature.

DUAL TOP RHA-100 Operating instructions
15
NO WATER control
Whenmode selectorknob (A) atControl Panel
issettowinter mode requiring heating withhot
sanitary water production (4), but the heater is
without water, there will be a warning signal at
the Control Panel.
The green LED with the icon heating without
hot sanitary water production (3) will blink.
When this happens, move mode selector knob
(A) at Control Panel to winter mode, heating
without hot sanitary water production (3).
Leaving mode selector knob (A) in the position
winter mode, heating with hot sanitary water
production (4), but filling the boiler with water
may lead to automatic drainage of the boiler at
temperatures lower than +6º C.
Fig. 3: No water signal
LED