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Fluid Level Sensor

Fluid Level Sensor

©Aqua-Hot®

 125-DN1 Service Manual 

REV 220421

©Aqua-Hot®

 125-DN1 Service Manual 

REV 220421

p. 21

p. 20

Fluid Level Sensor

Introduction:

The fluid level sensor monitors the current fluid level within 

the Aqua-Hot. This device is intended as a fail-safe measure 

which will disengage the Aqua-Hot if the fluid ever drops below a 

set threshold. The fluid level sensor is located on the expansion 

bottle, which is either mounted to the side of the unit (see 

Figure 37), or within the coach.

If  the  fluid  level  sensor  is  malfunctioning,  the  Aqua-Hot 

will show no signs of operation whatsoever. Troubleshoot this 

sensor if there is an adequate amount of fluid present within 

the Aqua-Hot, and the unit does not operate.

Troubleshooting Guidelines:

Before troubleshooting the fluid level sensor, ensure that the 

following requirements have been met.
• 

The fluid expansion bottle is filled to at least the “COLD” 

mark.

•  Verify that all coach-side in-line fuses are functional.
•  Ensure that the unit is completely cool.
•  Ensure that DC electrical power is supplied to the Aqua-Hot.
•  Ensure that AC electrical power is supplied to the Aqua-

Hot’s electric element.

• 

Ensure that the fluid level sensor is oriented correctly (see 

below).

If  any  of  the  requirements  above  are  not  fulfilled,  correct 

them  before  continuing  to  diagnose  the  fluid  level  sensor. 

Reference the troubleshooting guide to the right.

Locate the fluid level 

sensor (Figure 35)

Using a multi-meter, test 

for continuity across the 

fluid level sensor

Does the fluid level sensor 

have continuity?

Yes

No

Yes

No

Fill fluid 

expansion 

bottle. Re-

test Aqua-

Hot.

Replace the 

fluid level 

sensor

Is the fluid expansion 

bottle filled to at least the 

COLD position?

Locate the 5in. LCD screen

Navigate to the INPUTS 

FROM AQUA-HOT section.

HOME-->Aqua-Hot 

Diagnostics --> DIAG

Locate “LLCO.”

Does LLCO display TANK 

FULL?

Yes

No

This fluid 

level 

sensor is 

functioning 

as intended

Replace the 

controller.

Troubleshooting Procedure:

Figure 35

Figure 36

Fluid Level 

Sensor

Replacement Procedure:

In order to replace the fluid level sensor, the overflow bottle 

must also be replaced. Please visit www.aquahot.com or call 

574-AIR-XCEL (574-247-9235) to order the expansion bottle 

kit. Once you have the replacement part in hand, follow the 

procedure below.
1. 

Locate the fluid expansion bottle.

2. 

Clamp the overflow hose as close to the bottom fitting as 

possible.

3.  Grab a bucket or drain receptacle and place it directly 

under the lower fitting of the expansion bottle.

4. 

Remove the clamp from the lower fitting of the expansion 

bottle.

5. 

Remove the hose and allow the excess fluid to drain into 

the bucket.

6. 

Remove  the  overflow  hose  from  the  upper  fitting  of  the 

expansion bottle.

7.  Remove the old expansion bottle, disconnect the Faston 

connectors, and discard the old bottle.

8.  Secure the new bottle in position.
9. 

Crimp  the  new  faston  connectors  to  the  new  fluid  level 

sensor.

10.  Connect these wires to their receptacles on the Aqua-Hot 

harness.

11. 

Reconnect the overflow hose to the upper fitting.

12. 

Reconnect the expansion hose to the lower fitting.

13. 

Fill the bottle with the previously drained fluid.

14.  Remove the hose clamps.
15.  Test the Aqua-Hot for normal functionality.

If additional assistance is required please contact the Aqua-

Hot Heating Systems Technical support department at +1 (800) 

685-4298 from 7:00am to 4:00pm MST Monday through Friday.

Lower Fitting

Upper Fitting

Figure 38

Before  continuing  to  the  replacement  procedure, 

ensure that the unit has cooled to ambient temperature, 

all  power  sources  have  been  disconnected,  and  the 

unit is completely shut off.

Figure 37

Expansion Bottle can either 

be found mounted to the 

side of the Aqua-Hot unit or 

within the coach.

Содержание Aqua-Hot 100 Series

Страница 1: ...Service Manual 100Series AHE 125 DN1...

Страница 2: ...ed by transfer from the heated antifreeze and distilled water solution The heated domestic water then flows through the tempering valve to be mixed with cool water from the fresh water tank to achieve...

Страница 3: ...a Hot please contact our Technical Service Department at 574 AIR XCEL 574 247 9235 from 7 00am to 4 00pm MST Monday through Friday As with any appliance allow the Aqua Hot to completely shut down BEFO...

Страница 4: ...cing disconnect all power supplies DO NOT operate the diesel burner and or electric heating element without antifreeze and distilled water heating solution present in the Aqua Hot s boiler tank Doing...

Страница 5: ...2 Tempering Valve 3 Aqua Hot Controller 4 Antifreeze and Water Heating Solution Tank 5 AC Electric Element 6 AC Activation Relay 7 Plate to plate Heat Exchanger 8 Three Way Valve 9 Zone Air Bleed Val...

Страница 6: ...LCD screen From here the end user will select their interior temperature set points activate or deactivate the diesel burner and the electric element Zone Control 1 Precise zone control display will d...

Страница 7: ...utilized with the Aqua Hot 5in display Using the Aqua Hot with this new display will ensure that you can take advantage of all of the tools and features of this controller Features This new controller...

Страница 8: ...dicates that heat is either not needed or not requested by the zone thermostat 71 This indicates the set point of the coach thermostats The example in Figure 18 is showing the coach thermostat is requ...

Страница 9: ...ones have been directly wired to the Aqua Hot as described in the installation manual Heating sub systems can be activated independent of their control circuits and other control sensors as a means of...

Страница 10: ...ate Ensure the controller is properly oriented reference Figure 32 10 Using the 4 nuts previously removed fasten the controller to the mounting plate 11 Insert the controller and mounting plate into t...

Страница 11: ...to the INPUTS FROM AQUA HOT section HOME Aqua Hot Diagnostics DIAG Locate LLCO Does LLCO display TANK FULL Yes No This fluid level sensor is functioning as intended Replace the controller Troubleshoo...

Страница 12: ...this thermostat Yes No Depress the red button in the center of the high limit thermostat Figure 40 Re test for continuity Does the thermostat now have continuity Yes No This thermostat is functioning...

Страница 13: ...inue troubleshooting to the right Open a hot water faucet within the coach 1 1 2 2 Figure 47 Continue trouble shooting here Low Temperature Cutoff Thermostat Introduction The Low Temperature Cutoff Th...

Страница 14: ...s of the Three Way Valve to ensure it is out of the way 6 On the top of the Three Way Valve move the two 2 constant tension clamps AWAY from the tee fitting so that they are as far from the barb as po...

Страница 15: ...the Aqua Hot and slide the red and blue PEX through their ports in the front face of the Aqua Hot Use soapy water as necessary to lubricate the PEX going through the rubber grommets in the ports DO NO...

Страница 16: ...Figure 60 If no functionality replace the AC electric relay Figure 59 If tank temperature is not 180 F check element for 11 2 13 amps Replace the Electric element This AC Electric system is operating...

Страница 17: ...switch the electric heating element on and off in conjunction with the interior switch panel and ETS module even though the electric element is on a separate circuit Troubleshooting Procedure Trouble...

Страница 18: ...ely the same Yes This ETS module is functioning as intended Disconnect the ETS module from its leads on the wire harness Navigate back to the INPUTS FROM AQUA HOT section of the LCD screen No Yes No D...

Страница 19: ...Requirements Parts needed PLX 125 HA1 High Altitude Kit Potential other parts needed PLE 125 FL1 Kit 100 Series Fuel Line only if fuel lines are damaged PLX 125 003 Fuel Filter 100 Series only if fue...

Страница 20: ...Pins Figure 79 1 2 Ground goes to Pin 1 Power goes to Pin 2 If you would rather use a plug instead of the wire and gator clips the mating part numbers needed for the connector are Housing 1 967644 1 T...

Страница 21: ...uction A lack of interior heat or hot water when provided with adequate heat from either the electric element and or the diesel burner can be attributed to an overheat thermostat the Aqua Hot controll...

Страница 22: ...rner Troubleshooting This section will cover any issues with the external diesel burner The diesel burner is the primary heat source to the 125DN The troubleshooting procedures listed below are arrang...

Страница 23: ...or damage Check plumbing lines and circulation pump to make sure they are properly secured and free of any damage Check the fuel pump and circulation pump for any damage Run the burner for 20 minutes...

Страница 24: ...System Schematics System Schematics Aqua Hot 125 DN1 Service Manual REV 220421 Aqua Hot 125 DN1 Service Manual REV 220421 p 47 p 46 ZONE THERMOSTATS ZONE HEAT EXCHANGERS...

Страница 25: ...System Schematics System Schematics Aqua Hot 125 DN1 Service Manual REV 220421 Aqua Hot 125 DN1 Service Manual REV 220421 p 49 p 48 EXTERNAL DIESEL BURNER ELECTRIC ELEMENT...

Страница 26: ...de Connectors ELE 014 711 Thermistor Tank Temperature Sensor ELE 102 201 Aqua Hot AC Harness ELE 102 211 Burner DC Harness ELE 400 900 Harness Buehler C20 Pump ELX THM 309 Thermistor 10K NTC Room Temp...

Страница 27: ...00 Low Temperature Cutoff Thermostat w Spade Terminals ELX 2E7 102 125DN Element 1 NPSM 120 VAC 1500W Heating MSX 907 162 Refractometer EXE 103 0EX Heat Exchanger Cozy III PLX CTB 290 Clamp Hose Const...

Страница 28: ...that is complete peer through the eyeglass of the refractometer to continue to the next step Adjust the Boundary Line Once the glycol solution has been properly applied adjust the calibration screw u...

Страница 29: ...Heating Systems LLC 7501 Miller Drive Frederick CO 80504 Visit us online at www aquahot com Call us at 574 AIR XCEL 574 247 9235 2022 Aqua Hot Heating Systems LLC Printed in the USA Service Manual 10...

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