![background image](http://html1.mh-extra.com/html/airxcel/ahe-125-dn1/ahe-125-dn1_installation-manual_2880239010.webp)
Fluid Expansion Bottle
Fluid Expansion Bottle
©Aqua-Hot®
125DN Installation Manual
REV 220419
©Aqua-Hot®
125DN Installation Manual
REV 220419
p. 17
p. 16
Combustion Air System
The combustion air should not be supplied from living areas.
The air intake opening must not point in the direction of travel.
It also should be free from potential clogs from snow, debris, or
water.
• There is no air pressure difference between the exhaust
gas outlet or combustion air inlet.
• The combustion air intake must be positioned in a way that
the intake will not terminate within the vehicle interior or
near the burner’s exhaust pipe.
• The air intake tube must be located in a cool place.
• The combustion air intake must be positioned high enough
so splashing water cannot come into contact.
• It must be positioned as to not become clogged with dirt
or debris.
• It should not be able to draw in exhaust fumes.
• It must be positioned away from the face of travel.
The combustion air intake may be installed in the same
compartment as the vehicle’s fuel tank, but the air intake must
come from the exterior. The exhaust must be routed to the
exterior and any holes must be splash-proof.
An optional combustion air silencer may be installed as well.
The combustion air intake pipe, with a max length of 3ft, can
be screwed onto the combustion air connection piece on the
burner. The silencer is then screwed as far as possible into the
combustion air intake pipe.
Refer to the “Internal Combustion Engine Exhaust and Vehicle
Wall Openings” in RVIA’s ANSI/NFPA 1192 Handbook for
Recreational Vehicle Standards, as well as the National Fire
Protection Association’s (NFPA) 1192 Standard on Recreational
Vehicles for relevant information.
NOTE:
The air intake tube cannot be installed downward. A
water drain hole (Ø 5/32in) is to be made at the lowest point.
The tube should be installed in a position that stays as cool
as possible and protected from splashing water.
Combustion Air System
Should this particular application require modification, please
contact Aqua-Hot Heating Systems at 574-AIR-XCEL (574-274-
9235) for further assistance.
Figure 30
Combustion Air Connection
Burner Bottom View
Combustion Air Connection
Figure 29
Combustion Air Intake Hose
Figure 28
Exhaust System
The direction of the exhaust outlet must directed away from
any heat sensitive or highly flammable parts. Failure to do
so will result in a fire. Exhaust cannot be routed through the
interior of the vehicle, only the exterior. Failure to do so can
cause exhaust gas to leak inside the vehicle causing illness
and/or death.
The specifications and requirements must be followed carefully.
Failure to follow instructions may result in improper and unsafe
operation of the 125DN and burner. Please comply with all
applicable legal requirements.
•
Do not direct exhaust downward, as fire may result when
the vehicle is near dry, grassy areas.
• Exhaust must not terminate beneath the vehicle or beneath
a window or vent.
• Ensure that the exhaust pipe is routed away from any
awnings or slide-out areas.
• Position the exhaust pipe away and towards the rear of the
vehicle so the fumes naturally move away while the vehicle
is in motion and cannot permeate the interior of the RV.
Instructions
The exhaust pipe, with an inside diameter of 0.86in, can be
routed with several bends, total not to exceed 270°, and a
minimum bending radius of 2in. The total length must be
between 1’6” and 3’.
An optional muffler may be installed near the burner It may
not be fastened to temperature-sensitive vehicle parts. There
should be at least 0.8in between the muffler, or exhaust, and
temperature-sensitive parts. Thermal insulation may be used
on the exhaust pipe.
It is recommended to route the exhaust pipe in a downhill slope.
If it is not possible, drill drain holes (0.16in) at the lowest points.
The exhaust pipe opening should be positioned at an angle
of 90° (±10°) to the road. A fastener can be mounted at a
distance of less than 6in from the end of the exhaust pipe to
ensure the opening is at least 90°.
The exhaust pipe must be extended by an additional 0.4in if the
vehicle has an under-body shield.
Rigid, stainless steel with a minimum wall thickness of 0.04in
or flexible piping of the same material may only be used as the
exhaust pipe. The exhaust pipe is secured to the muffler using
supplied exhaust clamps.
Exhaust Outlet Requirements
•
The exhaust gas must be able to flow freely.
• The exhaust outlet must not be clogged with snow or debris.
• Exhaust outlet must not face in the direction of travel.
• Exhaust fumes may not enter the interior of the vehicle via
windows, doors, or other openings.
• The exhaust gas cannot be drawn in for the combustion air.
• The exhaust opening may not be close to the ground.
• If the vehicle has an under-body, the exhaust opening must
extend at least ⅜ in past the vehicle.
• The exhaust line must be secured at least 6in from the
exhaust outlet opening, so that the exhaust fumes exits at
an angle of 90° (±10°) to the ground.
Exhaust System
Exhaust Connection
Figure 32
Exhaust Pipe - Stainless Steel
Figure 31