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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

Summary of Contents for AHE-125-DN1

Page 1: ...Installation Manual 100Series AHE 125 DN1...

Page 2: ...urging the Interior Heating Loop 41 Fuel Supply 42 Fuel System 43 Fuel Purge Procedure 46 External Diesel Burner Troubleshooting 47 System Checks 49 First Operation 50 Winterizing 51 Flow Diagram 52 A...

Page 3: ...Aqua Hot 20 Aqua Hot to Heat Source port connected to Burner In Port 21 23 Aqua Hot from Heat Source port connected to Burner Out Port 21 23 RV Thermostats OR Thermistors wired to Aqua Hot 24 25 House...

Page 4: ...ll shut down all fans heat sources and pumps until the unit is adequately refilled House Power Sense The Aqua Hot Controller contains within it a fail safe functionality known as House Power Sense Thi...

Page 5: ...our on product identity label contains the specifications of your unit Factory settings may be adjusted by the vehicle manufacturer confirm final setting with your dealer This heating system has been...

Page 6: ...2 NOTE This product label shown above is attached to the side of the burner and provides a ready reference to specifications test standards and important safety notices 1 Fluid Circulation Pump 2 Tem...

Page 7: ...Aqua Hot in place on the RV floor Use at least 1 screw per mounting tab 3 tabs The best place for the Aqua Hot heating system is in a cabinet or storage space making sure there is ample space to remov...

Page 8: ...OTE Avoid any bends or dips in the overflow tubing from the Aqua Hot Air can become trapped in these bends and will prevent excess antifreeze and water heating solution from depositing properly in the...

Page 9: ...recommended to use a minimum of three mounting holes Do NOT mount the fuel pump higher than the fuel inlet on the burner see Figure 7 on Page 8 and the Fuel System section pages 40 44 for reference Hi...

Page 10: ...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 carefu...

Page 11: ...3041 Terminal TE Connectivity 828905 1 Wire Seal X6 Connector Figure 33 Figure 36 Figure 35 Diesel Burner Wire Harness The diesel burner and connectors will need to be properly installed Please note t...

Page 12: ...ircuits Connecting the Burner to the Aqua Hot These instructions will cover the installation and connections for the diesel burner to the 125DN Installation Instructions 1 Mock up the locations for th...

Page 13: ...ot re cut the thread multiple times The screw must be carefully inserted in the existing threads and screwed in by hand Burner Connections Retaining Plate 15mm Self Tapping Screw Plumbing Requirements...

Page 14: ...ntacts Once the required hardware has been acquired wire the J8 plug according to the table below Pins J8 10 through J8 15 are not utilized Pin Number Function Connect To J8 1 Zone 1 Thermostat In Zon...

Page 15: ...Special If for some reason pin J3 1 cannot be supplied with power supply 12V DC power to the J8 9 pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 J8 Wire Insertion View Shown J3 Wire Insertion View Shown Fig...

Page 16: ...to the vehicle s AC electric system Connect the 3 pin Molex connector to the coach side AC electric system in order to utilize the Aqua Hot s AC heating element The Aqua Hot utilizes Molex 19403 and 1...

Page 17: ...ly to be contaminated Aqua Hot advises against placing a heat exchanger on the slide out section of any vehicle due to the high probability of damage occurring to the heating loop from moving parts Fi...

Page 18: ...installation principles can hinder the operation of the heat exchangers All plumbing should be installed as flatly as possible Extreme rises in height should be avoided to avoid any potential air tra...

Page 19: ...nk is up at operating temperature Activate the external diesel burner to provide adequate heat for hot water needs The electric element will only provide light duty hot water The tempering valve is in...

Page 20: ...e of zone thermostats used within the RV Section 1A demonstrates the appearance of the zone control section when ON OFF thermostats are used within the RV In this use case these buttons serve only as...

Page 21: ...his option toggles the Aqua Hot s quiet mode Quiet mode is a setting where the speed and output of the heat exchanger fans is reduced to 80 This is done to reduce noise of the heat exchangers Please n...

Page 22: ...ternal pump in the receptacle which contains the heating solution Make sure to select the correct glycol antifreeze product for the external heating source Failure to select the correct product could...

Page 23: ...e fuel tank Vehicle Fuel Tank Figure 90 Fuel Supply Failure to follow instructions on the fuel delivery system can cause damage to the Aqua Hot 125DN the diesel burner or the RV It may cause serious p...

Page 24: ...Clamp B Bubble B A A B NOTE The fuel lines must be secured and supported properly to avoid air traps or bubbles Avoid unnecessary dips or bends the line should not run downward from the fuel pump High...

Page 25: ...omplexity Do not replace parts without correctly determining the failure Follow the directions below in order to troubleshoot the diesel burner Do not skip through the troubleshooting steps as this ma...

Page 26: ...here should be substantial separation from the burner and the ground 7 There should be enough space between the vehicle body and any heat generating components like the exhaust and burner 8 Ensure the...

Page 27: ...o perform the fuel line purge procedure on Page 44 prior to starting this initial start up of the burner Winterizing the Aqua Hot Not winterizing the Aqua Hot when freezing temperatures are present wi...

Page 28: ...r and Diesel Burner DIESEL BURNER AUTO AIR BLEED AUTO AIR BLEED 3 WAY VALVE COOLANT TEE RECOVERY BOTTLE FILL PORT BALL VALVE 3 Way Valve Controls Coolant Flow Path For Interior or Hot Water Heating In...

Page 29: ...eating Loop Purging the Heating Loop Aqua Hot 125DN Installation Manual REV 220419 Aqua Hot 125DN Installation Manual REV 220419 p 55 p 54 System Schematics ZONE THERMOSTATS System Schematics ZONE HEA...

Page 30: ...ating Loop Purging the Heating Loop Aqua Hot 125DN Installation Manual REV 220419 Aqua Hot 125DN Installation Manual REV 220419 p 57 p 56 System Schematics EXTERNAL DIESEL BURNER System Schematics ELE...

Page 31: ...he next step Adjust the Boundary Line Once the glycol solution has been properly applied adjust the calibration screw until the boundary line labeled Ethylene Glycol is set to 32 F The graphic to the...

Page 32: ...Room Temperature Sensor Parts Accessories EXX 950 411 Grille 10 x 2 Cozy EXX 006 500 Grille Long 3 5 x 21 5 Black EXE 505 65A Heat Exchanger Whisper Silent 12V DC EXX 013 100 Nozzle Round 4 w o Connec...

Page 33: ...FL1 Kit Fuel Line 125DN PLX 000 200 Tube Safety Stripe 12ft PLX 000 820 Fitting Elbow 90 Barb Black Nylon PLX 000 835 Fitting Reducer to Black Nylon Parts Accessories PLX 200 103 Fitting M NPT x Barb...

Page 34: ...e use of accessory parts or parts not authorized by Aqua Hot Heating Systems Inc repair by unauthorized persons and damage or abuse of the heater are specially excluded from warranty coverage For addi...

Page 35: ...ting Systems LLC 7501 Miller Drive Frederick CO 80504 Visit us online at www aquahot com Call us at 800 685 4298 or 303 651 5500 2022 Aqua Hot Heating Systems LLC Printed in the USA Installation Manua...

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