Aqua-Hot 375-LP User manual

INSTALLATION MANUAL
© 2011 Aqua-Hot Heating Systems Inc.
WARNING: If the information in these instructions is
not followed exactly, a fire or explosion may result
causing property damage, personal injury, or death.
—Do not store or use gasoline or other flammable va-
pors and liquids in the vicinity of this or any other
appliance.
—WHAT TO DO IF YOU SMELL GAS
•Evacuate all persons from the vehicle.
•Shut off the gas supply at the gas container or
source.
•Do not touch any electrical switch or use any
phone or radio in the vehicle.
•Do not start the vehicle’s engine or electric
generator.
•Contact the nearest gas supplier or qualified
service technician for repairs.
•If you cannot reach a gas supplier or qualified
service technician, contact the nearest fire
department.
•Do not turn on the gas supply until the gas leak(s)
has been repaired.
—Installation and service must be performed by a quali-
fied installer, service agency, or the gas supplier.
AVERTISSEMENT. Assurez-vous de bien suivre les
instructions données dans cette notice pour réduire au
minimum le risque d’incendie ou d’explosion ou pour
éviter tout dommage matériel, toute blessure ou la
mort.
—Ne pas entreposer ni utiliser d’essence ou ni d’autres
vapeurs ou liquides inflammables à proximité de cet
appareil ou de tout autre appareil.
—QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ :
•Évacuez le véhicule.
•Coupez l’alimentation en gaz au réservoir ou à la
source.
•Ne touchez à aucun interrupteur ; ne pas vous
servir du téléphone ou de la radio du véhicule.
•Ne pas démarrer le moteur du véhicule ni aucune
génératrice électrique.
•Appelez le fournisseur de gaz le plus proche ou un
technicien qualifié.
•Si vous ne pouvez rejoindre ni un fournisseur ni un
technicien qualifié, appelez le service des
incendies le plus proche.
•Ne pas rétablir l’alimentation en gaz tant que la
fuite n’a pas été réparée.
—L’installation et l’entretien doivent être assurés par
un installateur ou un service d’entretien qualifié ou
par le fournisseur de gaz.

CAUTION:
The Aqua-Hot tank and heating loop operate at
0.0 psi (zero pressure system). Air pressure
applied to the tank MUST NOT exceed 20 psi.
Excess pressure will result in internal damage.
CAUTION:
Before welding or plasma cutting on any coach;
it is necessary to disconnect the electric wiring to
the Aqua-Hot System.
Failure to disconnect the wires from the
Aqua-Hot System before using a welder or a
plasma cutter on the coach may cause damage to
the Aqua-Hot.

© 2011 Aqua-Hot® 375-LP Installation Manual
TABLE OF CONTENTS
Aqua-Hot 375-LP Installation Manual
Introduction........................................................................................................................................... 5
Section 1: Aqua-Hot Hydronic Heating System
Technical Information.......................................................................................................................... 6
Section 2: Aqua-Hot Installation
Installing the Mounting Tray and the Aqua-Hot.............................................................................. 10
Overall Aqua-Hot Dimensions........................................................................................................... 12
Installing the Cable-Clamp Fittings.................................................................................................... 14
Installing the Wires into the Terminal Blocks .................................................................................. 14
Installing the Expansion Tank ............................................................................................................ 15
Section 3: Hydronic Heating System
Heat Exchanger Location and Clearances......................................................................................... 16
Heat Exchanger Mounting Requirements......................................................................................... 16
Mounting the Heat Exchangers.......................................................................................................... 17
Sample Heating System Floorplan...................................................................................................... 19
Wiring the Heat Exchangers ............................................................................................................... 20
Plumbing Requirements....................................................................................................................... 22
Plumbing the Hydronic Heating System ........................................................................................... 23
Section 4: Thermostats
Fresh Water Tank Thermostat............................................................................................................ 26
Room Thermostats ............................................................................................................................... 27
Section 5: Domestic Water System
Domestic Water System Requirements ............................................................................................. 28
Domestic Water System Plumbing..................................................................................................... 28
Section 6: Switch Panel
Switch Panel Location.......................................................................................................................... 30
Switch Panel Mounting ........................................................................................................................ 30
Switch Panel Wiring.............................................................................................................................. 30
Section 7: Propane Connection
Propane Connection Requirements ................................................................................................... 32
Connecting to the Motorhome’s Propane Supply ........................................................................... 32

Section 8: Exhaust System
Exhaust System Requirements............................................................................................................ 35
Installing the Exhaust System .............................................................................................................35
Section 9: Power Source Wiring
Connecting the 12 Volt-DC Power....................................................................................................39
Connecting the 120 Volt-AC Power ..................................................................................................39
Installing the Wires into the Terminal Blocks ..................................................................................39
Section 10: Purging the Systems
Purging the Hydronic Heating System...............................................................................................41
Purging the System by Grounding the Zone Thermostat Connection......................................... 42
Purging the Domestic Water System..................................................................................................43
Purging the Propane System................................................................................................................44
Section 11: Initial Start-Up
Operating Safety Instructions.............................................................................................................. 45
Activating the Aqua-Hot......................................................................................................................46
Appendices:
Appendix A: Wiring Diagram ............................................................................................................. 47
Appendix B: Wire Gauge Information .............................................................................................. 48
Appendix C: Antifreeze Types............................................................................................................ 49
Appendix D: Antifreeze Mixture Water Quality Recommendations ............................................49
Appendix E: Antifreeze Terms and Mixture Ratio.......................................................................... 50
Appendix F: Measuring Propylene Glycol Using a Refractometer ..............................................52
TABLE OF CONTENTS (CONTINUED)

© 2011 Aqua-Hot® 375-LP Installation Manual
INTRODUCTION
Danger, Warning, Caution, and Note Boxes:
Danger, Warning, Caution, and Note boxes appear
throughout this manual as a means of alerting the install-
er to important information.
— Page 5 —
▲DANGER ▲
INDICATES THAT PERSONAL INJURY IS LIKELY OR IM-
MINENT.
WARNING!
Indicates that serious damage to the heater will occur
and personal injury is possible as well.
CAUTION
Indicates that damage to the heater is possible.
NOTE: Indicates information that requires special
attention by the installer.
The Aqua-Hot 375LP is a hydronic (water based)
heating system, and a tank-less hot water system.
The heating system provides moist, quiet, comforta-
ble, interior heat with up to three separate, thermo-
statically-controlled temperature zones, and prevents
tank and line freezing in the bays. The tank-less hot
water system produces 115 gallons per hour of con-
tinuous, on-demand hot water.
This TribridHot™ designated system uses one or a
combination of heat sources to heat FDA-approved
Generally Recognized as Safe (GRAS) propylene
glycol based antifreeze solution in the Aqua-Hot’s
boiler tank. The 375LP features a 120 Volt-AC,
1500 Watt electric element, and a 12 Volt-DC pow-
ered propane burner.
When AC power is available, plug in. When dry
camping, use the propane fuel source. The electric
power and propane fuel sources can be used sepa-
rately or together.
This Installation Manual is designed to aid in the
installation process of the Aqua-Hot 375LP Hydron-
ic Heating System by a trained and experienced tech-
nician.
Please note that all Danger, Warning, Caution, and
Note boxes, appearing as needed throughout this
manual, must be reviewed and adhered to during the
installation procedure in order to avoid potential
hazards, which could result in injury, death, product
damage, or property damage.
Should additional assistance be needed, please con-
tact Aqua-Hot Heating Systems at 1-800-685-4298,
Monday through Friday, between the hours of 7:00
AM and 4:00 PM Mountain Standard Time.