Isotherm BI 41 Installation And Operation Manual

BI 41

Installation and operation manual

Einbau- und Bedienungsanleitung

Installations- och bruksanvisning

Indel Webasto Marine S.r.l.
Zona Artigianale
IT-61019 S. Agata Feltria (PU), Italy
Te l: [phone]
Fax: [phone]
E-mail: [e-mail]
www.indelwebastomarine.com

Notes:

Isotherm built-in box
41 litres

General

Specially designed to operate in tough marine
environments, Isotherm fridge and freezer boxes are
outstanding in both performance and reliability. Fitted
with a fully hermetic, leak-free compressor, they offer
the lowest possible power consumption and noise
level. All models are easy to install. BI41 is used in
the fi rst hand as a refrigeration box, but can reach
temperatures down to -10°C/14°F. The box can stand
an angle of heel up to 30°, for a short time even
more. To ensure that your Isotherm box operates as
effi ciently as possible, please follow these general
guidelines:

* Unnecessary opening of the lid will increase
power consumption.
* Good ventilation of the compressor and
condenser unit will reduce power
consumption.
* The electrical system should be in good

condition. Inspect batteries and charging

level regularly. Always use a separate starter

battery for the engine. Follow carefully the

guidelines regarding electrical cable areas and

fuse placements.
* Keep the inside of the box clean and dry.
Keep the lid slightly open, to air the box when
leaving the boat for any length of time.
* Keep the drainage in the box closed during
normal operation, if such is mounted.

Operation

Te mperature setting

The boxes are fi tted with a manually operated,
infi nitely-variable thermostat to operate the box within
refrigeration temperatures. This is turned clockwise
to reduce temperature and anti-clockwise to increase
temperature.
Turn the thermostat knob to the off-position, maximum
anti-clockwise, to stop the unit working.
The thermostat knob is placed inside the box.

Defrosting
Defrosting shall be made when the frost layer is more
than 3-4 mm thick. Turn off the unit with the thermostat
put into off-position. Store the foodstuff and the bottles
as cold as possible during the defrosting. Do not use
sharp metal objects to remove frost or ice. Do not re­start until the box is completely defrosted and dried. Do
not forget to close the drainage if such is mounted,

Maintenance
The Isotherm boxes have a fully hermetic closed
cooling system and do not require any maintenance or
refi lling of refrigerant. The compressor is of domestic
type and has a very higheffi ciency and an outstanding
life-time. The box shall be left in the boat during the
winter. (If the temperature is below freezing point, the
compressor will not start).

The maintenance is reduced to periodically, not less
than a year, cleaning of the condenser from dust, on air
cooled units. Use a soft brush and no hard objects.
Keep the inside of the box. Use lukewarm water and
a mild cleaner for the inside. Put the lid, during not in
operation periods, in a slightly open ventilation position.
See also the Isotherm SP and Magnum installation
instructions.

Battery voltage sensor

To protect the batteries from becoming completely
discharged, a battery voltage sensor switches off the

compressor automatically at the following levels:

System voltage Cut-out Cut-in

12 9.6 alt. 10.4 10.9 alt. 11.7
24 21.3 alt. 22.8 22.7 alt. 24.2

Safety instructions and environment

- When connected to shore power, ensure that the
power supply is equipped with an automatic earth
leak switch. Danger!

- Never touch bare electric wiring connected to the
mains supply. Danger!

- Never connect a battery charger direct to the
refrigeration system. A battery charger must be
connected to the battery.

- In addition to acid, a newly-charged battery contains
explosive gas. Danger!

- Never open the refrigerant circuit except by the re­ operable quick couplings which are of self sealing
types and designed for this purpose.

- Never cover up the ventilation system for the
compressor unit.

- The refrigeration unit must be disposed by a
refrigeration specialist for correct recycling of
components and care taking of the refrigerant.

This appliance is marked according to the European
directive 2002/96/EC on Waste Electric and Electronic
equipment /WEEE). By ensuring this product is
disposed of correctly, you will help prevent potential
negative consequences for the environment and
human health, which could otherwise be caused by
inappropriate waste handling of this product.

The symbol on the product, or on the
documents accompanying the product, indicates that
this product may not be treated as household waste.
Instead it shall be handed over to the applicable
collection point for recycling of electrical and electronic
equipment. Disposal must be carried out in accordance
with local environmental regulations for waste disposal.
For more detailed information about treatment,
recovery and recycling of this product, please contact
your local city offi ce, your household waste disposal
service or the shop where you purchased the product.

GB

Fault fi nding chart

Fault Possible cause Action
Box not cold. Compressor will not start.

Compressor starts but does not cool
the box.

Check that power is present at electronic unit.
Chech fuse.
Check polarity on connectors and cables.
Bridge the thermostat over T-C, see wiring diagram.
If compressor starts, this indicates a faulty thermostat.
If the compressor does nopt start, this indicates a faulty electronic
unit or compressor.
Contact an authorized service agent.
A possible leak in the cooling system, contact an autorized service
agent.

If a complicated fault does occur, such as those requiring specialist assitance, pleas contact Indel Marine S.r.l. Italy or your
local marine distributor for advise.

Indel Webasto Marine S.r.l.

Te l. [phone]
Fax [phone]

E-mail: [e-mail]

Installation instructions

Mount the box carefully and safe. It is vitally important,
on air cooled units, that the compressor and the
condenser are well ventilated and that cold air can
enter from below and warm air can leave the space
around the compressor unit. (Warm air is leaving
upwards).
Do not install the box close to warm areas as the stove,
heater or the engine.
See the separate additional installation instructions for
Isotherm SP when the refrigeration unit is equipped
with an SP through hull fi tting/heat exchanger and also
the separate installation instructions valid for boxes
having a “Magnum” compressor unit water cooled with
water pump.

Electrical connections

When connecting the box electrically, it is important
that following points are considered:
Always use cables of suffi cient area. The area in the
following table should be regarded as a minimum.

Wire area
mm² AWG

Max wire length
12V m / ft

Max wire length
24V m / ft

2.5 12 2.5 / 8 5 / 16
4 10 6 / 18 12 / 32
6 10 10 / 32 20 / 64

* Always connect the box directly to the battery or
to the battery main switch on the plus circuit. Do not
connect it via the boats own control panel or other
diversions as this can cause a voltage drop in the
power supply. Use the included fuse holder with a 15A
fuse. Use 7.5A fuse in a 24 volt system. The fuse
shall be mounted on the plus cable.

* Connect the red cable to the positive (+) terminal
and the black to the negative (-) terminal. Use tab
type terminals for the connection to the electronic

unit and other cable
connectors of suffi cient size for the cable size
selected.
* Do not connect the box direct to a battery charger.
The battery charger must be connected to the
battery.

Technical data

Voltage: 12/24 Volt
Power consumption: Running compressor: 4 A (half for 24 V system).
Average consumption: 12 Volt: approx. 0.7 A (half for 24 V system) at +6°C in the
box and 22°C ambient temperature.
Compressor: Danfoss BD35F
Refrigerant: R134a
Fuse: 15 A for 12 V/7.5A for 24 V
Type designations: 3041BA2A00000 Air cooled compressor
3041BA2A00006 Air cooled compressor, Pipe with couplings and Click-on bracket
3041CA2B00000 SP-water cooled
Dimensions: Height 465 mm (625 incl. compressor), Width 340 mm, Deep 500 mm
Weight: 19 kg

Wiring diagram

Air cooled Water cooled SP

Brown

Blue

Black

Red

Red

Black

Red

Black

Brown

Blue

000889-2

000890-2

Isotherm SP Installation instructions

General

Isotherm SP is a sea water cooled refrigeration system for
sailing yachts and power boats. This unique system means
reduced power consumption and noise level. It has no fan
or pump. The sea water cooled skin fi tting/heat exchanger
replaces the air cooled condenser and cooling fan. The
heat is transferred directly to the surrounding water instead
of being circulated as hot air inside the boat.

Description

The special skin fi tting with its integrated condenser/heat
exchanger is mounted in the hull and is made of salt water
resistant brass with the heat exchanger coil in copper-nickel
alloy and replaces the existing skin fi tting for the sink drainage.
The connection pipes to the compressor have a length of 1
meter and are equipped with quick couplings. The couplings
can be opened and closed without loss of refrigerant. A fi lter
dryer is mounted approx. 20 cm (7¾”) above the skin fi tting
on the return pipe. A 1¼” ball valve should be mounted on
the skin fi tting.
Important! The hose between the sink and the ball valve shall be a minimum
of ø 38 mm (1½”). The skin fi tting is normally kept clean due to the constant
movement of the water and lack of sunlight. During sailing or motoring the
water will fl ash the fi tting and the heat exchanger coil rapidly, which will keep
it clean from marine growth. The skin fi tting shall be equipped with the zinc
anode on the outside and which is included in the delivery.

Operation

Always keep the ball valve open to ensure a satisfactory function.
If the ball valve is closed and the boat is in harbour, the fridge will operate at
a reduced cooling level.

During sailing or motoring the fridge will operate better but not to its full
potential with a closed valve. When the boat is on shore, the fridge system
will operate at a reduced level, in this case the ball valve must be kept open

to allow air ventilation through the hose and the sink.

Maintenance

When necessary clean the through hull fi tting, do not use sharp or hard tools, a brush will be enough. In a tropical
environment, cleaning of the fi tting has to be made more often. If necessary, the threaded bottom entrance
washer can be removed for better access to the heat exchanger coil.
Corrosion: Galvanic corrosion can often take place on board when the boat is surrounded by salt water and
should be carefully checked. This type of corrosion takes place depending on various electrical potential between
different devices. When two different metals are placed under water and connected to each other, electricity will
start to run. To prevent metal damages on parts under water, sacrifi ced anodes made of zinc are installed. Zinc is
a less noble metal compared to other materials used and will therefore be sacrifi ced.
All Isotherm refrigeration units have the plus and minus power supply separated from all chassis parts. Isotherm
SP has a skin fi tting in direct contact with the sea water and has as standard a zinz anode. The brass in the fi tting
is dezincifi cation and salt water resistant as well as the Cu/Ni condenser pipes and the soldering silver. The zinc
anode on the fi tting shall be inspected regularly and replaced as soon as half or more of the zinc is used. If it
is affected to a high degree and not lasting more than one season or part of a season, the electrical system on
board must be carefully checked to fi nd the reason for the galvanic or stray-current corrosion.
Make sure that the refrigeration system is connected to the electrical system in such a way, it cannot be
connected to the shore grounding when shore power is connected.
It is recommended to use an insulation transformer in the shore power system, to always be sure, boat and shore
grounding is separated.
When the boat is equipped with a central bonding system, the SP skin fi tting shall be connected to this with a 6
mm² copper cable. On the skin fi tting, there is a M5 hole for this purpose.

Mounting

First of all, plan the installation!

The skin fi tting is to be mounted in the hull instead of existing fi tting for
the galley sink waste water. The hole in the hull shall have a diameter of
60 mm (2½”). When an existing skin fi tting is to be replaced, it is taken
away by the following method. Place a wooden plug in the fi tting from
outside, use a 60 mm (2½”) hole saw with a centre drill and cut out the
complete skin fi tting at the same time as the new hole is made. Put
through the connecting pipes and the fi tting from the outside, seal

carefully using Sikafl ex 291 or equivalent. The skin fi tting has a 32 mm
wrench grip on the inside part for easy tightening of the counter nut.
Bend aside the connection pipes to allow the 1¼” ball valve to be mounted,
which on the galley sink side shall have a hose serrated tail ø38 mm (1½”)
hose to be installed. As an option, there is a kit available, consisting of
a 1¼ ball valve, ø38 mm (1½”) hose adaptor and modifi cation kit for the
sink hose connection.
Part no. SFD 00008 AA.

Remember to use twin hose clamps below the water line level.

The compressor unit is most likely to be placed in the compartment
below the sink, in a suitable distance from the skin fi tting, not more
than one meter (3 ft.). The compressor shall be mounted horizontally.
The bracket allows a choice of mounting positions, standing or
bulkhead mounting. The compressor needs to be protected from
splashed water or water leaking from the sink at all times.

Connection diagram