Isotherm BI 40 Operating & Installation Instructions Manual

Operating & installation instructions

Anwendungs- & Einbauanleitung

Bruks- & installationsanvisning

Build-in boxes BI 40

Einbauboxen BI 40

Inbyggnadsboxar BI 40

Indel Webasto Marine S.r.l.

Zona Artigianale
IT-61019 S. Agata Feltria (PU), Italy
Tel: [phone]
Fax: [phone]
E-mail: [e-mail]
www.indelwebastomarine.com

General

Specially designed to operate in tough marine environments, Isotherm fridge 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 extremely simple
to install. They will operate at a continuous angle-of-heel of up to 30° in all directions, for a short
time even more. To ensure that your Isotherm box operates as efficiently 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 levels

regularly. Always use a separate starter battery for the engine. Follow carefully the guide

lines regarding electrical cable areas and fuse placements.
* Keep the inside of the box clean and dry. Keep the lid slightly open to air the fridge box
when leaving the boat for any length of time.

Operation

Temperature setting

The 40L box is fitted with a manually operated, infinitely-variable thermostat. This is turned
clockwise to reduce temperature and anti-clockwise to both increase temperature and activate the
on-off switch at the end position. The switch position has a certain resistance to pass.
The thermostat knob is placed inside the box and allow setting within normal refrigeration
temperatures.

Defrosting

Defrosting shall be made when the frost layer is more than 4 mm thick. Set the thermostat in 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 re-start until the box is completely defrosted and
dried.

BI 40 with ASU:

Control panel functions:

The refrigeration unit is switched off when the toggle switch is in the mid position.
“NORMAL-AUTO “ position:

The green light comes on indicating that power is being supplied and the refrigeration program is
activated.
When the engine is running and the power supply (measured at the compressor's control unit) is
more than 13.2 (26.4) volt, the compressor starts supply cooling energy to the holding plate. The
compressor starts within the first 30 seconds and operates at first at low speed with the yellow
indicator “Economy” on. After 30 seconds, the speed of the compressor increases by 75% and the
red “Freeze” indicator lights. This operating condition is maintained until the holding plate is
completely frozen at approximately –14°C (7°F) whic h can take between 30 and 45 minutes,
depending on ambient temperature. On reaching this temperature the compressor stops and red
the light goes out. When the temperature of the holding plate rises to –10°C (14°F) the compressor
re-starts to charge the holding plate and the red light comes on again. This process is repeated a
couple of times every hour to keep the holding plate at its optimum efficiency level. If the engine is
stopped, shortly afterwards the compressor also stops.
When the engine is not running and the battery voltage is below 12.7 (25.4) volt the surplus of
refrigeration energy stored in the holding plate is used first. Only when this has been consumed
does the compressor start and the yellow light comes on indicating that it is now running at its
“Economy” speed to top-up the holding plate. This condition starts when the temperature of the

holding plate rises to –1°C (30°F) and stops when i t reaches economy level of –6°C (21°F).

“MAN-TEMP” position:

This position can be used when either shore-power is being used or if for some other
reason a higher or lower refrigerator temperature is desirable. The automatic function is
partially blocked and the temperature is regulated by means of the rheostat, clockwise for
colder and anti-clockwise for warmer. “A” indicates the holding plates temperature point for
“Accumulation”. In this mode the compressor starts but runs at low speed only to keep the
noise level as low as possible.

Indicator lights:

Green: Power and system on, but compressor at still-stand due to
Sufficiently low temperature of the holding plate.
Green + yellow: Compressor running within the higher temperature range.
Green + red: Compressor running on high speed within the lower temperature

range.

Green + yellow + red: Compressor running on lowest possible speed to reach selected

temperature in MAN-TEMP mode.

Flashing yellow + red: Error signal from the black electronic unit. Automatic restart after 1

minute. Select MAN-TEMP if necessary.
Flashing yellow: Low battery voltage sensor has switched off the system. Automatic
re- start occurs when the engine is running and batteries are
charged again.

Note:

After switching on, up to 30 sec. duration is required before the compressor starts. When
the engine is started, a duration of ½ to 10 minutes is required (depending on the boats
charging equipment and battery condition) before the system reacts. When the engine is
stopped, a duration of ½ - 5 minutes (depending on battery condition and level of charge) is
required before the system reacts.

Maintenance

The Isotherm boxes have a fully hermetic closed cooling system and do not require any
maintenance or refilling of refrigerant. The compressor is of domestic type and has a very
high
efficiency and an outstanding life-time. The build-in 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. Use a soft brush and no hard objects.
Keep clean inside 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.

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
12V 10.4V 11.7V
24V 22.8V 24.2V

Safety instructions

When connected to shore power, ensure that the power supply is equipped with an automatic
earth leak switch. Danger!
Never tough bare electrical wiring connected to the mains supply. Danger!
Never connect 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 cover up the ventilation systems 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.

Fault finding chart

Fault Possible cause Action

Box not cold. Compressor will not start. Check that power is present at
electronic unit.
Check fuse.
Reversed polarity.
Check all connections and cables.
Bridge the thermostat. See wiring
diagram.
If compressor starts this indicates a
faulty thermostat.
If the compressor does not start this
indicates a fault in the electronic unit
Compressor starts but does or the compressor.
Not cool the box. Contact an authorized service agent.

Installation instructions

Mount the box carefully and safe. It is vitally important that the compressor and the condenser
are well ventilated and that cold air can enter 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.

Electrical connections

When connecting the box electrically, it is important that following points are considered:
* Always use cables of sufficient area. The area in the following table should be regarded

as a minimum.

Cable area mm² Max cable length in metres, 12 V Max cable length in metres, 24 V

2.5 2.5 5
4 4 8
6 6 12
10 10 20

* 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.
The fuse shall be mounted on the plus cable.