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WALLAS 40D

 

Operator’s Manual and Installation Guide

 

 

8

Inlet air ductlng 

 
Inlet air for the Nautic 40D furnace is taken through two 3 inch (75mm) air ducts. This allows the 
furnace to be installed in the engine compartment or other spaces where the air may be foul.

 

One of the 2 x 

3 inch (75mm) 

suction connections of the furnace is installed to extract fresh air 

from the outside, and the other to extract air from inside the boat. Protective grilles without 
throttle valves are attached to the ends of the suction pipes, and the opening for outdoor air also 
needs to be protected appropriately against the weather. 

 
For safety reasons the furnace must not be installed In a place where gasoline fumes 
might be present. 
 

The suction air is taken in via two branches of ducting.  One inlet duct should take in some fresh 
air and the other inlet duct should take in return air from inside the boat. (See Figures 12, 14, 
15) 
The longest permissible length of one branch of the suction air duct is 8 ft, based on a minimum 
diameter of the inlet air ducts being 3" to prevent excessive pressure drop. 
 
Protective grilles should be connected to the ends of the inlet ducts. These grilles are available 
from Scan Marine. 
 
Protect the opening of the fresh air inlet ducts with some form of weather/vermin shield. 
Protective shields for this purpose are available at most marine supply stores. 
 
All inlet duct connections should be secured with hose clamps. 
 
 

 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Summary of Contents for Nautic 40D

Page 1: ...WALLAS 40D Operator s Manual and Installation Guide 1 2010 Two Mac Inc...

Page 2: ...el options include a Basic Control Panel with indicator lamps or a Digital Info Control Panel The furnace is made entirely of marine grade materials Table 1 Technical details of furnace 40D TECHNICAL...

Page 3: ...tantly at an angle The installation must maintain a minimum of 8 inches under the furnace to facilitate maintenance otherwise removal of the unit will be necessary for maintenance To avoid galvanic co...

Page 4: ...wo M8 x 120 locking bolts Figure 6 Attaching the control panel Note either the 3004 or 3005 can be mounted with or without the bezel shown here 3005 panel must have the bezel fitted for thermostat to...

Page 5: ...WALLAS 40D Operator s Manual and Installation Guide 5...

Page 6: ...WALLAS 40D Operator s Manual and Installation Guide 6...

Page 7: ...n order to secure sufficient air flow the heating air must be divided into at least three outlet vents The ducting attaches to two 3 inch 75mm outlet adaptors at the end of the furnace The longest per...

Page 8: ...safety reasons the furnace must not be installed In a place where gasoline fumes might be present The suction air is taken in via two branches of ducting One inlet duct should take in some fresh air...

Page 9: ...e the power switch to the OFF position The furnace cannot be restarted until the cooling fans have stopped and all indicator lamps have gone out Once the indicator lamps have gone out restart the furn...

Page 10: ......

Page 11: ...at When installing please note the thermostat manufacturer s instructions The thermostat will not switch the furnace on or off but will adjust the furnace between minimum power and the user determined...

Page 12: ...WALLAS 40D Operator s Manual and Installation Guide 12 Figure 15 Figure 14...

Page 13: ...mportant 1 Make sure the fuel line end is cut cleanly and squarely 2 Slide the nut on the fuel line with the threads toward the line end 3 Push the acorn over the end of the fuel line 4 Slide the ferr...

Page 14: ...ngine pickup Install a filter in the fuel line Note the need for replacing the fitter periodically Cut the fuel line to a suitable length during installation Ensure that the fuel line joint surfaces a...

Page 15: ...thout the consent of the manufacturer The instructions for installation operation or maintenance have not been followed Storage or transport has been inappropriate A problem has resulted from an accid...

Page 16: ...WALLAS 40D Operator s Manual and Installation Guide 16 June 2 2010...

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