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Aqua-Hot 400 Series Service Manual

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SERVICE MANUAL
400
SERIES
AHE-400-P01

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Summary of Contents for Aqua-Hot 400 Series

  • Page 1 SERVICE MANUAL SERIES AHE-400-P01...

  • Page 2: Warning Labels

    DANGER signals a situation where immediate risk of serious injury or death will result if you do not follow instructions NOTE: In addition, this manual may indicate an IMPORTANT NOTE that highlights information that is especially important. © Aqua-Hot® AHE-400-P01 Service Manual Rev. B June 2014...

  • Page 3: Table Of Contents

    Appendix G: Filling/Draining the Aqua-Hot ----------------- 86-88 Electric Heating Element Status -------------------------------- 41 Heating Zones (1-5) --------------------------------------------------- 41 Low Battery Voltage Fault ------------------------------------------ 41 Low-Temp Cutoff Status --------------------------------------------- 41 Low Tank-Level Cutoff ------------------------------------------------ 41 © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 5: Safety Instructions & Precautions

     The Aqua-Hot’s exhaust is HOT and must be kept away  The Aqua-Hot must be installed in a compartment that from heat sensitive material.

  • Page 6: Understanding The Major Systems

    The Aqua-Hot will continue to send the heated heating source from the interior switch panel.
  • Page 7 Although the Propane-burner is the primary heating source for the Aqua-Hot and is necessary for providing con- ene glycol based antifreeze is selected. tinuous domestic hot water, an alternate heat source exists ...
  • Page 8 Another major function of antifreeze is to provide protec- freeze and water heating solution contains over 70 percent tion to the internal metal components of the Aqua-Hot hy- antifreeze, the freezing point is actually raised, resulting in dronic heating system from corrosion and rust. Antifreeze is less freeze protection.

  • Page 9: Technical Information

    Handbook for Recreational Vehicle Standards. To receive a copy of this handbook and other pertinent 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 online at www.rvia.org. © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 10: Cut-Away Diagrams

    Wiring Harness and Ball Valve Harness Port AC Terminal Port AC Terminal Propane Block Burner Controls VAC Access Panel Propane Burner Interlock Switch Zone 1 Zone 2 Drain Valve Circulation Circulation Pump Pump © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...
  • Page 11 Section #: Title Aqua-Hot Overview Figure 3 Cold Water Inlet Port Tempering Valve Hot Water Outlet Port Low Temperature Cutoff Thermostat © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...
  • Page 12 Section #: Title Aqua-Hot Overview Figure 4 Expansion Tank Connection Air Release Valve Zone 1 and 2 Inlet Ports Zone 1 and 2 Outlet Ports AC Wiring Port Inlet Port © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 13: Operational Flow-Chart

    NOTE: The circulation heating solution moves pumps and heat exchang- through the Heat Ex- ers will not operate until changers in the Zone the Boiler Tank reaches a calling for heat minimum of 150°F © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 14: Interior Switch Panel

    The interior switch panel is used to control the two po- source (e.g. shore power, generator, etc.) and the electric tential heating sources for the Aqua-Hot’s boiler tank. When element switch is ON, the electric heating element will be a switch is activated, the indictor light on the switch will illu- used to provide heat to the boiler tank if the need arises.

  • Page 15: Pin Label

    To “IND-LT (-) B6 Electric Element Switch to Burner Switch to Electronic Controller connections Electronic Controller connections NOTE: The electric element switch possess a jumper wire, which advance from terminal 3 to terminal 4. © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 16: Exhaust System Requirements

    Section #: Title Exhaust System Requirements The Aqua-Hot’s exhaust is hot and must be kept away from  The exhaust must be able to freely exit away from the any heat-sensitive material; therefore, the exhaust system vehicle without any obstructions.

  • Page 17: Interlock Switch

    1. Disconnect the interlock switch’s wires by pulling the Friday from 7 a.m. to 4 p.m. 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 and Switches lock switch.

  • Page 18: Fluid-Level Sensor

    Aqua-Hot’s boiler tank using the drain valve. 3. Disconnect the fluid-level sensor’s wires by releasing 1. Verify that the Aqua-Hot’s boiler tank is full of the anti- the clip securing the plug to the sensor and pulling the freeze and water heating solution.
  • Page 19 3. Using a 3/8 hex socket, remove the nut holding the ring terminal to the ground stud. The stud is located 1. Verify that the Aqua-Hot’s boiler tank is full of the anti- adjacent to the fluid level sensor. freeze and water heating solution.
  • Page 20 The circuit is connected via the boot terminal. boot terminal. 4. Using a 7/8” wrench, unscrew the fluid-level sensor 4. Refill the Aqua-Hot’s boiler tank with the antifreeze and from the Aqua-Hot’s boiler tank. It may be necessary to water heating solution.
  • Page 21 The heating status light does not illuminate on the elec-  Verify the Propane-burner’s control thermostat wires tronic controller when the Aqua-Hot is below 155 ° F. are properly connected and that there are no loose wires, both at the Propane-burner and at the JP4 plug Troubleshooting: on the electronic controller.

  • Page 22: Control Thermostat

    2. Drain the antifreeze and water heating solution from stat’s wires. the Aqua-Hot’s boiler tank using the drain valve. 8. Refill the Aqua-Hot’s boiler tank with the antifreeze and 3. Disconnect the defective control thermostat’s wires by water heating solution.

  • Page 23: Ac High-Limit Thermostat

    1. Ensure that the Aqua-Hot has been completely shut heat to the boiler tank. down and that all 120V ac power supplies have been disconnected, confirm with a voltmeter.

  • Page 24: Dc High-Limit Thermostat (Right)

    NOTE: By passing the high-limit thermostats is for testing 2. Remove the two wires from the defective high-limit ther- only and must not be used for the Aqua-Hot’s normal func- mostat by pulling firmly on the wires. tionality. 3. Using a 5/8 wrench or socket, remove the defective high-limit thermostat from the Aqua-Hot’s boiler tank.

  • Page 25: Dc High-Limit Thermostat (Left)

    NOTE: By passing the high-limit thermostats is for testing only and must not be used for the Aqua-Hot’s normal func- 2. Remove the two wires from the defective high-limit ther- tionality.

  • Page 26: Low Temperature Cutoff Thermostat

    - between 155°F and 185°F. guish. B. Verify that the domestic hot water is not being B. Inspect the wiring to ensure that the Aqua-Hot is used. wired properly and that the low-temperature cut- off thermostat has not been bypassed via jumper 2.
  • Page 27 Section 5 for the proper pin jumper or personal injury. configuration. 1. Ensure that the Aqua-hot has been completely shut down and that all the power sources have been discon- 3. If the jumper pins are properly positioned, fol- nected.

  • Page 28: Check Valves

    This mixture ratio should be approximately 50/50. If the 11. Refill the Aqua-Hot’s boiler tank with the antifreeze and solution is fully antifreeze (100%), the check valves will water heating solution. Reference appendix D for continue to stick.

  • Page 29: Tempering Valve

    Aqua-Hot Components Tempering Valve: Replacement Procedure: The tempering valve for the Aqua-Hot mixes the heated do- mestic water from the boiler tank with cold domestic water at pre-set ratio to reduce the risk of scalding. Failure to disconnect all power supplies and/or to allow the...

  • Page 30: Circulation / Stir Pumps 1

    The circulation pumps first draw the heated antifreeze and Using a voltmeter, check for 12 Volts of DC power on water heating solution from the Aqua-Hot’s boiler tank, then the JP3 plug pins corresponding to the pump not oper- propels it through the hydronic heating system’s interior ating.
  • Page 31  Disconnect the power wire by using wire cutters and 10. Refill the Aqua-Hot’s boiler tank with the antifreeze and cutting the butt connector. (a new butt connector water heating solution. will need to be utilized when installing the replace-...
  • Page 32 Pump #2 and Pump #3. If the “Pump #2” indicator light remains RED when the stir There is no Pump #3 on the Aqua-Hot 400 series. pump is disconnected, check the wiring for damage. If no...
  • Page 33 If both hoses are hot, the pump is working properly. nector and joining the two wires together. 10. Refill the Aqua-Hot’s boiler tank with the antifreeze and If only one hose is hot, or neither hose is hot, check the cold water heating solution.
  • Page 34 Status Light is not illuminated, troubleshoot the control thermostat. Troubleshoot the electric heating element if the following If the boiler tank is above 155°F, the Aqua-Hot is at operat- condition has occurred: ing temperature and requires no heat. ...
  • Page 35 If the ohms reading is not between 8.5 to 9.5 ohms follow 8. Reinstall the AC access cover. the instruction in this section to replace the electric heating 9. Refill the Aqua-Hot’s boiler tank with the antifreeze and element. water heating solution.

  • Page 36: Electric Heating Element

    1. Ensure the Aqua-Hot has been completely shut down and that all power sources have been disconnected. Troubleshoot the AC relay if the following condition has oc-...

  • Page 37: Electronic Controller

    It also will indicate when panel is connected to the electronic controller, as circuits are functioning properly with a green indi- well as the wiring circuitry from the Aqua-Hot unit. cator light. Electronic Controller General Facts Figure 23 Nominal Input Voltage Range ..

  • Page 38: Secondary 12 Volt-Dc Battery Connection

    This feature will en- The electronic controller is equipped with two 12 Volt-DC sure that the Aqua-Hot will be protected in the event that the power source connections, which allow for the secondary 12 primary power is interrupted while the Propane-burner is Volt-DC battery connection.

  • Page 39: Low-Voltage Reset Feature

    Section #: Title Electronic Controller Low-Voltage Reset Feature: Whenever the Aqua-Hot’s DC power is interrupted for longer set” button on the electronic controller (use a thin, straight, than 5 minutes, the “Low Battery Voltage Fault” red indica- non-metallic object to access the button through the face- tor light on the electronic controller will illuminate.

  • Page 40: Replacement Procedure

    Aqua-Hot 400-LP. Reference information in the sec- or personal injury. tion for proper pin-jumper configuration. 1. Ensure that the Aqua-Hot has been completely shut 8. Install each terminal strip/plug back onto the electronic down and that all the power sources have been discon- controller and tighten the screw on the terminal strips/ nected.

  • Page 41: Electronic Controller Indicator Lights

    Under normal operating conditions, this light will not be illuminated because an adequate level of antifreeze and water heating solution within the Aqua-Hot’s boiler tank Heating Zone Status (1-5) exists. When illuminated (red only), some possible issues that...

  • Page 42: (Circulation) Pump #1

    Pump #3 Pump #2– Zone Pump The Aqua-Hot 400 does not utilize Pump #3. However the light will be illuminated anytime Pump #2 light is illuminat- NOTE: Pump #2 and Pump #3 are jumped together via a jumper wire.

  • Page 43: Propane-Burner

    Propane-Burner Propane-Burner Overview The Aqua-Hot’s Propane-burner is a device that ignites a mixture of Propane gas and air within a con- trolled setting to serve as a heat source. The flame is established in a combustion chamber within the Aq- ua-Hot’s boiler tank and the heat from the flame is transferred to the antifreeze and water heating solu-...
  • Page 44 Section #: Title Propane Burner Controls Propane-Burner Controller Figure 30 Hot Surface Combustion Igniter Blower Fan Buck Boost Buck Boost Burner Controller © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 45: Propane-Burner Operational Flow Chart

    8. The Flame Sensor verifies that a Inter-Purge flame is present. 10 seconds 14. A 2-Mintue Purge Cycle takes place. 15. The Combustion Blower Motor is 9. Hot surface igniter is de-activated. deactivated © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 46: Propane-Burner Wiring Diagram

    Section #: Title Propane-Burner Controller Wiring Burner Circuit Figure 31 © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 47: Detaching The Propane-Burner

    OFF position and disconnect the Pro- Position prior to beginning this replacement procedure. pane-Burner’s power supply before detaching the Propane- burner from the Aqua-Hot. Failure to turn off the Propane- Burner and disconnect power could result in serious bodily injury.
  • Page 48 3. Pull the plugs completely out of the Propane-Burner Controller and the Buck Boosts. Figure 37 NOTE: There are also 3 wires connected to the propane-burner controller, that will need to be removed, by firmly pulling on the quick con- nect terminals. © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...
  • Page 49 Instructions for Detaching the Propane-Burner Step 4: Remove the gas line from the Propane-Burner Be sure to turn off the Propane Gas Sup- ply 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 50 Section #: Title Propane-Burner Instructions for Detaching the Propane-Burner Step 5: Remove the Propane-Burner from the Aqua-Hot 1. The Propane-Burner is secured to the Aqua- 2. Carefully lift the Propane-Burner away from the Hot with four nuts that can be removed by us- Aqua-Hot.

  • Page 51: Reattaching The Propane-Burner

    2. Finger tighten all four nuts previously removed with the combustion chamber and slide onto to secure the Propane-Burner to the boiler tank. the bolts protruding from the boiler tank. Figure 45 Figure 44 © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...
  • Page 52 1. Connect the Supply Gas Line to the Propane- 2. Using an 11/16 wrench, tighten the nut on Burner’s Gas Valve Assembly. the gas line to the Gas Valve Assembly to secure the line in place. Figure 47 © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...
  • Page 53 A. Wire # 86 connects to the PWR terminal. B. Wire # 92 connects to the BLO terminal. C. Wire # 82 connects to the HSI+ Terminal Figure 48 Figure 49 © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...
  • Page 54 Step 4: Reinstall the Access Cover NOTE: The access cover must be installed prior to operation as a safety switch exists, which will prevent the Aqua-Hot from operating whenever the access cover is not properly installed 1. Reinstall the Aqua-Hot’s access cover.

  • Page 55: Mounting Gasket

    Propane-Burner Mounting Plate. Replacement Indicator: The Mounting Gasket should be replaced each time the The Aqua-Hot operates o both AC and DC power. Be sure to Propane-Burner is detached from the Aqua-Hot. disconnect the 120 Volt-AC power supply from the Aqua-Hot prior to servicing.
  • Page 56 Replacement Procedure Visual Inspection Procedure It is possible to view the Hot Surface Igniter, to verify func- The Aqua-Hot operates o both AC and DC power. Be sure to tionality. disconnect the 120 Volt-AC power supply from the Aqua-Hot prior to servicing. Failure to do so could result in serious 1.
  • Page 57 Section #: Title Propane-Burner Components Hot Surface Igniter - (continued) 6. Reconnect the wires previously disconnected. 7. Test for proper operation. Figure 53 Hot Surface Igniter © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 58: Refractory

    2. Turn the propane gas supply valve, located on the top of The Aqua-Hot operates o both AC and DC power. Be sure to the heater, to the OFF position. disconnect the 120 Volt-AC power supply from the Aqua-Hot prior to servicing.
  • Page 59 Section #: Title Propane-Burner Components Refractory: (Continued) Hot Surface Figure 54 Igniter Flame Sensor Refractory © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 60: 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. © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...
  • Page 61 Section #: Title Propane-Burner Components Be sure to turn OFF the Propane Gas 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. Be sure to disconnect the 120 Volt-AC power supply from the Aqua-Hot prior to servicing.

  • Page 62: Combustion Blower Fan

    Air shutter assembly onto the replacement 12 VDC, at the white plug, plugged into the Propane combustion blower fan. Torque = 12 in/lbs. Burner Controller. If no voltage is present replace the Propane-Burner Controller. © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...
  • Page 63 Torque = 35 in/lbs. 9. Reconnect the wires, previously disconnected. 10. Test for proper operation. Figure 59 Propane Burner Controller Combustion Blower Fan Gasket Phillips 9mm Socket Screwdriver 3/8” Socket © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 64: 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 and to ensure the Exhaust Tip is installed properly. © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 65: Fan Validation Switch

    NOT running replace the 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. © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 66: 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 that the combustion blower fan is running. © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 67: Buck Booster- Combustion Blower Fan

    4. Verify that the Propane Burner Controller is sending a ground signal to the buck boost converter at the GND pin, on the Controller © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 68: Buck Booster- 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. © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 69: Flame Sensor

    Disconnect power and reconnect meter leads for proper polarity. NOTE: A defective flame sensor will usually allow the burn- er to ignite for approximately 2-5 seconds, and then shut down into default mode. © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 70: Fenwal Burner Controller

    NOTE: Recover from lockout requires a manual reset by removing 12 VDC for a period of 5 seconds, or waiting 1 hour. © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...
  • Page 71 Section #: Title Burner Controls Fenwal Burner Controller Figure 67 Figure 68 Fenwal Burner Controller © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 72: Specifications

    Section #: Title Fenwal Controller Specifications Figure 69 © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 73: Troubleshooting

    Section #: Title Troubleshooting If one of the Aqua-Hot Heating Zones will not get Hot: If there is a Lack of Domestic Hot Water: 1. General Problems: 1. General Information:   Propane/Electric not operating (antifreeze cold) The Heater is rated for a water flow of 1.5 GPM.

  • Page 74: If There Is Antifreeze Leaking

    3. On the Rear of the Aqua Hot: A. Domestic Water copper plumbing. solution i. The copper coil is in the antifreeze and where they come through the boiler tank is a possible point of leakage for each pipe. © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 75: Burner Troubleshooting Flow-Chart

    The Heater is the blower fan is not running. Functioning Check the Motor’s in-line fuse for Properly. continuity. Replace if necessary. Verify the Propane Burner Con- troller is sending power to the blower fan. © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...
  • Page 76 The Gas Valve should make wiring, the Electronic Control- start an Audible Click when 12VDC Power ler will Need to be replaced. and Ground is applied. Is the Gas Valve Clicking? © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...
  • Page 77 2. Replace Fan Validation to the Controller? Switch Verify the Fan Vali- Replace the Gas Valve dation Switch Relay is receiving ade- quate power and Replace the Control ground from the Board Electronic Control Board. © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...
  • Page 78 Igniter glow for tion is installed properly. approx. 10 seconds? Disconnect the two wires going to the Hot Surface Igniter Using a digital voltage meter check for 12VDC power on the wires. © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...
  • Page 79 End of The “If the Burner Does Not Ignite” Troubleshooting Flow Chart. For additional troubleshooting information please contact: Aqua Hot Heating System’s Customer Service Department at (303)-651-5500 Mon-Fri 7:00 a.m. - 4:00 p.m. © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...
  • Page 80 Status Light will not be illuminat- the back pressure switch for conti- 4. Locate the Burner’s Blower nuity when the burner flame goes fan fuse, and verify it has con- out. tinuity. © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...
  • Page 81 End of The “If the Burner Does Ignites and Flames Out” Troubleshooting Flow Chart. For additional troubleshooting information please contact: Aqua Hot Heating System’s Customer Service Department at 303-651-5500 Mon-Fri 7:00 a.m. - 4:00 p.m. © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 82: Appendix A: Wiring Diagram

    Section #: Title Appendix A: Wiring Diagram © Aqua-Hot® AHE-400-P01 Service Manual Rev.B June 2014...

  • Page 83: Appendix B: Cold Weather Operation

    50% full. B. Is the motor home’s propane tank filled with propane or butane? NOTE: The Aqua-Hot can continue to be used for interior zone heating once the domestic water heating sys- Butane has a lower boiling point than pro- tem has been drained and winterized.
  • Page 84 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 heating demand situations (such as when moderate ambient tem- peratures exist and/or when there is a low demand for domestic hot water).

  • Page 85: Appendix F: Winterization Process

    RV antifreeze is present. Not winterizing the Aqua-Hot when freezing temperatures Perform this procedure for both the hot and cold fau- are present will result in serious damage to the Aqua-Hot’s cets. domestic water heating system. Also, be sure to use an FDA 6.

  • Page 86: Appendix G: Filling/Draining The Aqua-Hot

    Application Department at 1-800-685-4298. ous injury or death. NOTE: To fill the Aqua-Hot, it is recommended to use a fluid transfer pump to pump the antifreeze into the boiler tank through the drain valve on the Aqua-Hot.
  • Page 87 10. Open the drain valve and turn the fluid transfer pump Figure G3. on and fill the Aqua-Hot with the 50/50 mixture of anti- 7. Take the circulation pump’s blue (negative) wire and freeze and water heating solution until the Low Tank- disconnect it from the connector of the opposing wire.
  • Page 88 Failure to do so could result in an Aqua-Hot to a bucket. antifreeze spill in the motor home’s bay. Open the Aqua-Hot’s drain valve located at the from the of In order to provide the best freeze protection, boil-over pro- heater. Reference Figure G5.
  • Page 89 HYDRONIC HEATING SYSTEM AHE-400-LP Aqua-Hot Heating Systems Inc. warrants the Aqua-Hot Heater to be free from defects in material and workmanship under normal use and service for a period of two years on both parts and labor commencing upon the original date of registration of the vehicle. Replacement parts are warranted for the remainder of the Heater’s standard warranty coverage or for six months,...
  • Page 92 Service Manual SERIES AHE-400-P01 Rev B. June 2014 7501 Miller Drive, Fredrick, CO, CO 80504 Visit us on line at www.aquahot.com Call us at (800) 685-4298 or (303) 651-5500 ©2013 Aqua-Hot Heating Systems Inc. Printed In U.S.A.
  • Page 93 This manual has been provided courtesy of My RV Works, Inc. www.myrvworks.com You can find more RV service manuals here: www.myrvworks.com/manuals Over the years of running a mobile RV repair service, having a dedicated place to access service manuals for all the different appliances and components found on RVs was something that I always had a desire to create.

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