Aqua-Hot 375-LP Service Manual
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Aqua-Hot 375-LP Service Manual

Hydronic heating system
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See also: Owner's Manual , Installation Manual
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.
SERVICE MANUAL
• 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.
AHE-375-P02
© 2011 Aqua-Hot Heating Systems Inc.

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Summary of Contents for Aqua-Hot 375-LP

  • Page 1 — Installation and service must be performed by a quali- source. fied installer, service agency, or the gas supplier. • Do not touch any electrical switch or use any phone or radio in the vehicle. SERVICE MANUAL AHE-375-P02 © 2011 Aqua-Hot Heating Systems Inc.

  • Page 3: Table Of Contents

    Table of Contents General Information Danger, Warning, Caution, and Note Box Definitions ........... Page 6 Section 1: Introduction To The Aqua-Hot 375-LP Technical Information ....................Page 7 I.D. Label Sample ......................Page 8 Operating Instructions ....................Page 9 Aqua-Hot Heater Overview................... Page 10-12 Aqua-Hot Operational Flow-Chart ................
  • Page 4 Table of Contents Section 5: Filling/Draining The Aqua-Hot 375P With Heating Solution Filling the Aqua-Hot ....................Page 45-47 Draining the Aqua-Hot .................... Page 48 Section 6: Propane-Burner General Recommended Maintenance ..............Page 49 General Component Overview ................Page 50-51 Propane-Burner Operational Overview ..............Page 52 Controller Wiring Schematic ...................
  • Page 5 The Propane-Burner will ignite, but short cycles (only runs for a short amount of time before shutting down) ................... Page 81 The Aqua-Hot is operating, but an interior and/or fresh water tank heating zone is not working….…………………………………………………………..……………………..Page 82 The Aqua-Hot is at operating temperature; however, the interior and/or fresh water tank heat exchanger fans are not operating ............

  • Page 6: General Information

    Please note that all Danger, Warning, Caution, and Note box- es, appearing as needed throughout this manual, must be reviewed and adhered to during servicing of the Aqua-Hot in Indicates that damage to the heater is possible. order to avoid potential hazards which could result in injury, death, product damage, and/or property damage.

  • Page 7: Section 1: Introduction To The Aqua-Hot 375-Lp

    RVIA Standards, write to: Recreation Vehicle Industry Association, 1896 Preston White Drive, P.O. Box 2999, Reston, VA 22090-0999, call them at (703) 620-6003, or visit them online at www.rvia.org. — Page 7 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 8: Label Sample

    Front - Open Access Install in strict compliance with local codes, NFPA Back - 0 inches 1192, and the manufacturer’s instructions Top - 6 inches — Page 8 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...
  • Page 9 1: I 375-LP ECTION NTRODUCTION TO THE — Page 9 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 10: Operating Instructions

    Zone 1 and 2 I.D. Label Propane Inlet Outlet Ports Hot Water Outlet Port Terminal Block Access Area Cold Water Inlet Port Operating Instructions Site Access — Page 10 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...
  • Page 11 LOAT WITCH 12 D ROPANE URNER IESEL URNER IMIT HERMOSTATS Electric Element High-Limit Thermostat Electric Element Control Thermostat 14 1500 Watt Electric Element — Page 11 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...
  • Page 12 1: I 375-LP ECTION NTRODUCTION TO THE Figure 4 120 Volt-AC Relay Zone 1 Relay Zone 1 Relay Fuse Block Ground Strip — Page 12 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 13: Aqua-Hot Operational Flowchart

    1: I 375-LP ECTION NTRODUCTION TO THE AQUA Chart 1 Aqua-Hot Operational Flowchart Heat source is selected from the Interior Switch Panel. Propane-Burner is activated Electric Heating Element is by the Burner switch. activated by the Electric switch. The Boiler Tank heats the antifreeze and water heating solution to 190*F.

  • Page 14: Antifreeze And Water Heating Solution

    Aqua-Hot Heating of chemical inhibitors. Due to their potentially hazardous Systems Inc. recommends CAMCO’s Boiler Antifreeze - properties, they should never be used in the Aqua-Hot’s 100°. Hydronic Heating System. Antifreeze Types:...
  • Page 15 Boiling Point: The Aqua-Hot utilizes the antifreeze and water heating solu- tion as a transportation means for the heat produced from the internal processes. The antifreeze absorbs the heat created until its boiling point is reached;...

  • Page 16: Section 2: Interior Switch Panel

    190±5°F in approximately 10-20 minutes. procedure allows the 120 Volt-AC Electric Heating Element to operate and supply heat to the Aqua-Hot‟s Boiler Tank, The indicator light, adjacent to the Propane-Burner switch, which will heat the Aqua-Hot‟s antifreeze and water heating will illuminate whenever the Propane-Burner switch is in the solution to the maximum operating temperature of 190±5°F...

  • Page 17: Switch Panel Wiring Schematic

    2: I 2011 ECTION NTERIOR WITCH ANEL FOR UNITS MANUFACTURED BEFORE ANUARY Figure 6a — Page 17 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...
  • Page 18 2: I 2011 ECTION NTERIOR WITCH ANEL FOR UNITS MANUFACTURED AFTER ANUARY Figure 6b Figure 6c — Page 18 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...
  • Page 19 2: I ECTION NTERIOR WITCH ANEL This Page Intentionally Left Blank — Page 19 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 20: Exhaust System Requirements

    XHAUST YSTEM EQUIREMENTS  Because the Aqua-Hot‟s exhaust is hot and must be kept The exhaust must be able to freely exit away from the away from any heat-sensitive material, the exhaust system vehicle without any obstructions. should be checked to ensure that it continues to meet the following requirements: ...

  • Page 21: Section 4: Aqua-Hot Components

    1. Disconnect the interlock switch‟s wires by pulling the 685-4298. quick connectors from the switch‟s spade terminals. 2. Release the interlock switch from the Aqua-Hot cabinet by pushing in on the locking tabs and pulling the inter- Sensors/Switches lock switch.

  • Page 22: Float Switch

    Troubleshooting: 3. Disconnect the float switch‟s wires by separating the quick-disconnect terminals. 1. Verify that the Aqua-Hot‟s boiler tank is full of the anti- freeze and water heating solution. 4. Using a 7/8 socket, remove the defective float switch from the Aqua-Hot‟s boiler tank.

  • Page 23: Propane-Burner Control Thermostat

    The Propane Burner‟s control thermostat is installed into the If there is no continuity, follow the instructions in Aqua-Hot‟s boiler tank and monitors the temperature of the this section for replacing the control thermostat. antifreeze and water heating solution to determine when it is at operating temperature and when it requires heat.
  • Page 24 ALLOW THE HEATER TO COOL BEFORE SERVICING COULD CAUSE SERIOUS DAMAGE OR PERSONAL INJURY 6. Screw the replacement control thermostat into the port on the Aqua-Hot boiler tank and tighten securely with a 1. Ensure that the Aqua-Hot has been completely shut down 7/8 socket.

  • Page 25: Electric Element Control Thermostat

    CAUSE SERIOUS DAMAGE OR PERSONAL INJURY when it requires heat. The Aqua-Hot is considered to be at operating temperature between 158°F and 190°F. A. Verify that the temperature of the boiler tank has Troubleshoot the electric element control thermostat if one of fallen below the 158°F minimum operating...
  • Page 26 Control Thermostat: Electric Element (continued) Replacement Procedure: 5. Install the replacement control thermostat, tighten- 1. Ensure that the Aqua-Hot has been completely ing only to 15 in/lbs. Do not over-tighten. shut down and that all power sources have been disconnected.

  • Page 27: Electric Element High Limit Thermostat

    COULD CAUSE SERIOUS DAMAGE OR PERSONAL INJURY which prevents it from continuing to provide heat to the boil- er tank. 1. Ensure that the Aqua-Hot has been completely shut down and that all power supplies have been Troubleshoot the AC high-limit thermostat if the following disconnected.

  • Page 28: Propane-Burner High Limit Thermostat (Left)

    TO ALLOW THE HEATER TO COOL BEFORE SERVICING COULD CAUSE SERIOUS DAMAGE OR PERSONAL INJURY Propane-Burner from operating. 1. Ensure that the Aqua-Hot has been completely shut Troubleshoot the Left DC high-limit thermostat if the follow- down and that all power sources have been ing condition has occurred: disconnected.

  • Page 29: Propane-Burner High Limit Thermostat (Right)

    COULD CAUSE SERIOUS DAMAGE OR PERSONAL INJURY lockdown for an hour 1. Ensure that the Aqua-Hot has been completely shut Troubleshoot the right DC high-limit thermostat if the fol- down and that all power sources have been disconnect- lowing condition has occurred: ...

  • Page 30: Low Temperature Cutoff Thermostat

    1. If the “Low Temp Cutoff Thermostat” Does not trip when avoids the possibility of cold water pockets during showers. domestic hot water is being used or when the Aqua-Hot falls below operating temperature, complete the following: NOTE: The Low Temperature Cut-Off thermostat disables on the interior heating zone fans, only.
  • Page 31 4. Using a 5/8 wrench or socket, remove the defective low- temperature cut-off thermostat from the Aqua-Hot. 5. Install the replacement low-temperature cut-off thermo- stat tightening only to 15 in/lbs. Do not overtighten.

  • Page 32: Interior Heating Zone Check Valve

    If, after the initial release of the stuck check valve, it continues to stick, or if it 11. Refill the Aqua-Hot‟s boiler tank with the antifreeze and never releases follow the instructions in this section to water heating solution.
  • Page 33 4: A ECTION OMPONENTS Figure 17 Check Valve Assembly — Page 33 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 34: Domestic Water Tempering Valve

    5. Remove the Tempering Valve Assembly from the Aqua- Hot. The tempering valve for the Aqua-Hot mixes the heated do- A. Disconnect the hot and cold water lines, located on mestic water from the boiler tank with cold domestic water at the front of the Aqua-Hot boiler tank.
  • Page 35 ECTION OMPONENTS Figure 18 Bulk Head Fitting Retaining Nut Front of Heater Hot Water Outlet Port Cold Water Inlet Port Mixer Valve Assembly — Page 35 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 36: Interior Heating Zone Circulation Pumps 1

    SERIOUS DAMAGE OR PERSONAL INJURY heating solution from the Aqua-Hot‟s boiler tank, then pro- pel it through the Hydronic heating system‟s interior heat 1. Ensure that the Aqua-Hot has been completely shut down and plumbing. that all power sources have been disconnected. Also, because...
  • Page 37 4: A ECTION OMPONENTS Figure 19 Awl Inserted into the mounting bracket Zone Pump 1 Zone Pump 2 Harness Plug with Red Locking Tab — Page 37 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 38: Stir Pump (Circulation Pump #2)

    The stir pump circulates the antifreeze and water heating #93 wire. If no power is present Trouble shoot the solution within the Aqua-Hot‟s boiler tank in order to ensure Combustion Blower Fan Buck Boost. even-heating of the solution. To accomplish this, the stir pump draws the solution from the bottom of the tank and B.

  • Page 39: Electric Heating Element

    Troubleshoot the electric heating element if the following condition has occurred: If the boiler tank is above 185°F, the Aqua-Hot is at operating temperature and requires no heat.  There is a lack of hot domestic water and interior heat when the electric element is selected as the heating 4.
  • Page 40 CAUSE SERIOUS DAMAGE OR PERSONAL INJURY 9. Reinstall the propane burner. Reference Section 7. 1. Ensure that the Aqua-Hot has been completely shut down and that all power sources have been disconnected. Also, 10. Refill the Aqua-Hot‟s boiler tank with the antifreeze because this replacement procedure will involve the boiler and water heating solution.

  • Page 41: Electric Heating Element A.c. Relay

    If no power is present follow troubleshooting guide for the electric element switch. B. If 12 Volts of DC power are present, continue: — Page 41 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...
  • Page 42 TO ALLOW THE HEATER TO COOL BEFORE SERVICING COULD CAUSE SERIUOS DAMAGE OR PERSONAL INJURY 1. Ensure that the Aqua-Hot has been completely shut 5. Remove A.C. Relay from the side of the heater. down and that all power sources have been disconnect- 6.

  • Page 43: Interior Heating Zone Relay - Heat Exchanger Fans

    2. Since the Aqua-Hot 375-LP is a hot water priority sys- 5. On the zone relay, check pin #8 for 12 VDC +. tem, make sure the Low Temperature cut-off Thermostat...

  • Page 44: Interior Heating Zone Relay - Circulation Pump

    NOTE: Even though the Aqua-Hot 375 is a Hot Water Pri- 6. On the zone relay, check pin #4 for 12 VDC +. ority system, and utilizes a Low Temperature Cut-Off ther-...
  • Page 45 Reference Figure please contact the Aqua-Hot Heating Systems Product Appli- cation Department at 1-800-685-4298. 1. Open the Aqua-Hot‟s drain valve located at the front of Figure 25 the heater. Reference Figure 25. 2. Connect a piece of 1/2 inch PEX-type tubing to the drain valve.
  • Page 46 Figure 24. Hold the valve open until all air is re- leased. Be sure the valve is closed when finished by 9. Check the Aqua-Hot‟s expansion tank and top it off to hand-tightening. Look for the solution to enter the over-...

  • Page 47: Filling The Aqua-Hot

    Figure 27 Terminal Block for Switches, Heat Exchanger Fans and Thermostats Figure 28 Zone 1 Thermostat Connection Terminal Zone 2 Thermostat Connection Terminal — Page 47 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 48: Draining The Aqua-Hot

    Failure to do so could result in an antifreeze spill in the motor home‟s bay. Reference Figure 2. Open the Aqua-Hot‟s drain valve located at the front of the heater. Reference Figure 27. In order to provide the best freeze protection, boil-over pro-...

  • Page 49: Section 6: Propane-Burner General Recommended Maintenance

    This solution level should be checked in the Aqua-Hot‟s Expansion Tank and should only be checked when the Aqua-Hot is at maximum operating temperature (i.e., when the Propane-Burner cycles OFF at 190±5°F). The antifreeze and water heating solution‟s level should be at the “HOT”...

  • Page 50: General Component Overview

    VERVIEW Figure 31 Combustion Dual Stage Gas Valve Exhaust “High” Back Pressure Switch Hot Surface Igniter Flame Sensor Refractory Igniter Insulation Validation Switch — Page 50 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...
  • Page 51 6: P ECTION ROPANE URNER OMPONENT VERVIEW Figure 32 Burner Controller Hot Surface Igniter Buck Boost Combustion Blower Motor Buck Boost — Page 51 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 52: Propane-Burner Operational Overview

    10 seconds 14. A 2-Mintue Purge Cycle takes place. 9. Hot surface igniter is de-activated. 15. The Combustion Blower Motor is deactivated — Page 52 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 53: Controller Wiring Schematic

    8 - Left High Limit Thermostat 9 - Left High Limit Thermostat 12 - Right High Limit Thermostat 13 - Right High Limit Thermostat 14 - Stir Pump — Page 53 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 54: Detaching The Diesel-Burner

    Propane-Burner and disconnect power could result in serious bodily injury. CAUTION! Be sure to turn off the Propane Fuel Supply at the port on top of the Aqua-Hot prior to beginning this replacement procedure. Step 1: Turn Off the Propane-Burner Switch Figure 37 1.
  • Page 55 Propane-Burner Controller to the buck boosts, and both of the green plug connections to the Buck Boosts. Figure 40 Figure 40A — Page 55 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...
  • Page 56 Step 4: Remove the fuel line from the Propane-Burner CAUTION! Be sure to turn off the Propane Fuel Supply at the port on top of the Aqua-Hot prior to beginning this procedure. 1. Locate the gas valve assembly on the Propane- 2.
  • Page 57 ETACHING AND EATTACHING THE ROPANE URNER Step 5: Remove the Propane-Burner from the Aqua-Hot 1. The Propane-Burner is secured to the Aqua-Hot 2. Carefully lift the Propane-Burner away from the with four nuts that can be removed by using a 9/16 Aqua-Hot.

  • Page 58: Reattaching The Diesel-Burner

    Propane-Burner to the boiler tank. bolts protruding from the boiler tank. Figure 48 Figure 49 — Page 58 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...
  • Page 59 2. Using an 11/16 wrench, tighten the nut on the Burner’s Gas Valve Assembly. fuel line to the Gas Valve Assembly to secure the line in place. Figure 51 — Page 59 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...
  • Page 60 A. Wire #r 86 connects to the PWR terminal. B. Wire # 92 connects to the BLO terminal. C. Wire # 82 connects to the HIS+ Terminal Figure 54 Figure 53 — Page 60 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...
  • Page 61 1. Set the access cover back into place on the Aqua-Hot. Figure 55 2. Insert the bolts in the two locations on the Aqua-Hot to se- cure the cover in place; tighten the bolts securely. NOTE: The access cover must be installed prior to operation as...

  • Page 62: Mounting Gasket

    Hot Surface Igniter Replacement Indicator: The Mounting Gasket should be replaced each time the The Aqua-Hot operates o both AC and DC power. Be sure Propane-Burner is detached from the Aqua-Hot. to disconnect the 120 Volt-AC power supply from the Aqua -Hot prior to servicing.
  • Page 63 Surface Igniter Replacement Procedure. Replacement Procedure Visual Inspection Procedure The Aqua-Hot operates o both AC and DC power. Be sure to disconnect the 120 Volt-AC power supply from the Aqua It is possible to view the Hot Surface Igniter, to verify func- -Hot prior to servicing.
  • Page 64 OMPONENTS AND EPAIR NFORMATION Hot Surface Igniter - (continued) 6. Reconnect the wires previously disconnected. 7. Test for proper operation. Hot Surface Igniter — Page 64 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 65: Insulation, Refractory

    1. Turn the Propane-Burner Switch to the OFF position, on the switch panel inside the motor home. The Aqua-Hot operates o both AC and DC power. Be sure to disconnect the 120 Volt-AC power supply from the Aq- 2. Turn the propane fuel supply valve, located on the top of ua-Hot prior to servicing.
  • Page 66 8: P ECTION ROPANE URNER OMPONENTS AND EPAIR NFORMATION Refractory: (Continued) Flame Sensor Hot Surface Igniter Refractory — Page 66 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 67: Dual Stage Propane Gas Valve

    A. Using a Digital Volt Meter, check the #87 (green) wire, on the White Plug, plugged into the Propane-Burner Controller for 12 VDC. If no voltage is present replace the Propane-Burner Controller. — Page 67 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...
  • Page 68 URNER OMPONENTS AND EPAIR NFORMATION CAUTION! Be sure to turn OFF the Propane Fuel Supply, at the port on top of the Aqua-Hot prior to beginning this replacement procedure. Dual Stage Propane Gas Valve (continued) Propane inlet port ball valve The Aqua-Hot operates o both AC and DC power.

  • Page 69: Combustion Blower Fan

    5. If the Right D.C. Hi-Limit thermostat is functioning properly, verify that the Buck Boost Converter for the Blower motor is operating properly. — Page 69 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...
  • Page 70 8: P ECTION ROPANE URNER OMPONENTS AND EPAIR NFORMATION Gasket Combustion Blower Fan Propane Burner Controller 3/8” Socket Phillips 9mm Socket Screwdriver — Page 70 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 71: Exhaust "High Back Pressure" Switch

    NOTE: Before Replacing the High Back Pressure Switch, it is recommended to inspect the exhaust pipe for damage or restrictions. — Page 71 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 72: Fan Validation Switch

    B. If there is no continuity while the propane burner is off, Turn the Propane Burner to the ON position, and verify that the combustion blower fan is running. — Page 72 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 73: Fan Validation Switch Relay

    NOT running replace the fan validation switch Relay. B. If there is no continuity while the propane burner is off, Turn the Propane Burner to the ON position, and verify — Page 73 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 74: Buck Boost Converter (Combustion Blower Fan)

    Controller B. If the propane burner controller is not sending a ground signal to the buck boost converter, replace the propane burner controller. — Page 74 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 75: Buck Boost Converter (Hot Surface Igniter)

    #95. Wire #95 then goes to the combustion blower fan‟s buck boost, and is tied into Wire #11, which is the ground wire for the Hot Surface Igniter‟s buck Boost. — Page 75 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 76: Flame Sensor

    0.7µA or higher while flame is established. If meter reads below “0” on scale, meter leads are reversed. Disconnect power and reconnect meter leads for proper polarity. — Page 76 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 77: Fenwal Burner Controller

    NOTE: Recover from lockout requires a manual reset by removing 12 VDC for a period of 5 seconds. — Page 77 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...
  • Page 78 8: P ECTION ROPANE URNER OMPONENTS AND EPAIR NFORMATION Fenwal Burner Controller Fenwal Burner Controller — Page 78 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...
  • Page 79 8: P ECTION ROPANE URNER OMPONENTS AND EPAIR NFORMATION Fenwal Burner Controller — Page 79 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 80: Section 10: Troubleshooting

    Check the Interlock switch for functionality. B. YES b. Check the Control Thermostat (The Aqua-Hot‟s normal operating range is 160-190°F) for functionality by locating the control thermostat on the heater, disconnecting the wires and placing a jumper wire on the harness between wires #10 &...

  • Page 81: The Propane-Burner Switch Has Been Turned On And The Propane-Burner's Blower Motor Has Begun To Operate; However, The Propane-Burner Does Not Ignite

    1. Check the Propane-Burner‟s Hot surface Igniter for proper functionality. 2. Check The Flame Sensor. The Aqua-Hot’s exhaust system “Woofs/Pops” when the Propane-burner is ignites: 1. Check The Propane-Burner‟s Hot surface Igniter for proper functionality. The Propane-burner will ignite, but short cycles (only runs for a short amount of time before shutting down) 1.

  • Page 82: The Aqua-Hot Is Operating, But An Interior And/Or Fresh Water Tank Heating Zone Is Not Working

    The Aqua-Hot is operating, but the domestic hot water system is not producing hot water. 1. Reference Section 1, pages 13-14, and ensure that the Aqua-Hot is using the appropriate antifreeze type and mixture ratio. 2. Verify that the water outlet‟s domestic hot water flow rate is at or below 1.25 Gallons per Minute (GPM).

  • Page 83: The Electric Element Switch Has Been Turned On; However, The Aqua-Hot's 120 Volt-Ac Electric Heating Element Does Not Operate

    1. Ensure that the motor home is plugged into shore power or has the generator running. 2. Ensure the Aqua-hot is not up to maximum operating temperature, by checking it with a digital thermometer. 3. With the Interior Switch Panel‟s Electric Element switch on, locate the Electric Element‟s 120VAC relay and check for DC volt- age at Pin #0 (+) and Pin #1 (-);...

  • Page 84: Appendix A: Wiring Diagram

    A: W 2011 PPENDIX IRING IAGRAM FOR UNITS MANUFACTURED BEFORE ANUARY — Page 84 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...
  • Page 85 A: W 2011 PPENDIX IRING IAGRAM FOR UNITS MANUFACTURED AFTER ANUARY — Page 85 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...
  • Page 86 This Page Intentionally Left Blank — Page 86 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 87: Appendix B: Wire Gauge Chart

    B: W PPENDIX AUGE HART — Page 87 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

  • Page 88: Appendix C: Winterization Process

    Not winterizing the Aqua-Hot when freezing temperatures this procedure for both the hot and cold faucets. are present will result in serious damage to the Aqua-Hot’s Domestic Water Heating System. Also, be sure to use an 6. Remove the hose and reconnect the domestic water demand FDA approved, “GRAS”...

  • Page 89: Appendix D: Extreme Cold Weather Operation

    System. Also, be sure to use an FDA approved, “GRAS” A. Is there propane in the motor home? rated antifreeze for winterization. NOTE: The Aqua-Hot can continue to be used for interior zone heating once the domestic water heating system has been drained and winterized.
  • Page 90 If there is a lack of interior Heat: Note: The 120 Volt-AC Electric Heating Element is the Aqua-Hot‟s secondary heat source for heating both the interior and/or the domestic hot water during low heat- ing demand situations (such as when moderate ambient temperatures exist and/or when there is a low demand for domestic hot water).
  • Page 91 — Page 91 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...
  • Page 92 AHE-375-P02 SERVICE MANUAL 15549 East Highway 52 | Fort Lupton, CO 80621 Toll free: 800.685.4298 | phone: 303.659.8221 | fax:303.857.7881 www.aquahot.com — Page 92 — ® © 2011 Aqua-Hot 375P02 - LP Hydronic Heating System Service Manual—Rev. B...

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