General Installation Overview; Checklist Of Minimum Requirements For The Installation Of Heaters On Marine Vessels - Webasto Air Top 2000 S Installation Instructions Manual

General Installation Overview

Checklist of Minimum Requirements for the Installation of Heaters on Marine Vessels

Installation Location of Heater
• Install heater in a location that will prevent it from being submerged in the bilge water when the vessel is heeling
• As a rule, to be installed in the foredeck box or locker (to keep exhaust lines short)
Fuel Connection
• Mount the pump as closely to the fuel tank as possible (see Fig. 9, page 19)
(maximum 1.2 meter long suction line, maximum 9 meter pressure line)
• Install pump with an anti vibration, sound deadening mount
• Always use a fuel filter (see Fig. 7, page 18 and Webasto accessories)
• Do not mount pump on frames (noise transmission)
• Provide for dedicated fuel extraction, i.e. use separate tank extraction device (standpipe), do not extract fuel from
engine's supply line. Do not "Tee" into engine fuel delivery or return lines.
Exhaust Gas System
• Exhaust gas outlet: on sailing vessels to be located at the upper stern (due to heeling) on motor boats on the sides
(owing to submerging of the upper stern)
• Install exhaust gas outlet at least 500 millimeters (20 inches) above the water line
• Always route lines with a goose-neck bend (see Fig. 4, page 15) preventing water from entering the system when
the vessel is heeling
• Always use a sealed exhaust muffler (if applicable to your installation)
• Maximum overall length of the exhaust tube is 5 meters (16.5 feet) without muffler or 2 meters (6.5 feet) with a
muffler installed.
• The total radius of bends should not exceed 270 degrees (large radii to be selected)
• Always insulate the exhaust tubes
• A condensation water drain is necessary with exhaust line lengths greater than 3 meters (10 feet) and optional on
shorter lengths (see Fig. 4, page 15) (drain to be filled with water after installation)
Combustion Air System
• Air to be drawn from ventilated foredeck box or ventilated locker or *engine room (*Diesel engines only)
• Check that intake openings are unobstructed
Heating Air Intake
• Air to be drawn from ventilated foredeck box or ventilated locker, not from the engine room (ensure that intake
openings are kept unobstructed)
• Optionally, fresh air or recirculated air may be drawn in using a distributing piece with control flap (Webasto
accessory)
Hot Air Circulation
• In the saloon, large, non-closable air outlet nozzles are to be used
• In backrooms, use small air outlet nozzles; they may be closable
• At least one air outlet nozzle with an outlet diameter appropriate for the heater must always be open
• Keep length of the air duct lines as short as possible to achieve good heat circulation without excessive flow
restriction on the heating system overall
Electrical System
• Be sure to install an external temperature sensor if air heaters are operated in the fresh-air mode
Webasto Product N.A., Inc.
Air Top 2000 S, 3500 & 5000 Marine
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