Purging the Heating Loop
Filling the Aqua-Hot
©Aqua-Hot®
125DN Installation Manual
REV 220419
©Aqua-Hot®
125DN Installation Manual
REV 220419
p. 41
p. 40
8. On the LCD screen, navigate to the TESTING page, turn on
the pump, and set the 3-way valve to “HOT WATER”.
9.
Activate the supply pump, open the fluid fill valve, and fill
the unit while paying attention to the fluid expansion bottle.
Allow this pump to run until the fluid level in the expansion
bottle reaches the “COLD” mark.
10.
Once the “COLD” mark has been reached, close the fluid fill
valve and deactivate the external fill pump.
11.
Remove the external fluid fill pump.
12. Proceed to the next page to purge the zone before
attempting to start the unit.
Filling the Aqua-Hot
Before the first activation of the Aqua-Hot, fill the unit with
antifreeze and water heating solution. Without the solution
present, the Aqua-Hot will not operate, it will not deliver hot
water, and it will not deliver heat. Follow the directions below
to fill the Aqua-Hot with antifreeze and water heating solution.
In order to provide the best freeze protection, boil-over
protection, anti-corrosion, and rust protection, a mixture of 50/50
Ethylene Glycol antifreeze and distilled water is recommended.
The Aqua-Hot 125D boiler tank holds approximately 1.8 gallons.
The mixture may be modified to provide the most adequate
freezing, boiling, and rust/anti-corrosive protection. A 50/50
mixture of
Ethylene Glycol
and distilled water has a freeze
point of approximately -35°F and a boiling point of approximately
223°F. Reference page 55 for measuring the antifreeze mixture
with a refractometer.
Fill Instructions:
1. Locate the following items:
- Exterior fluid pump (a diaphragm pump if possible)
- The Aqua-Hot fluid expansion bottle
- A bucket or pale
2. Locate the glycol product which is to be used in this heater.
3. Fill the bucket with the antifreeze and distilled water
solution.
4.
Locate the fluid fill port (shown in Figure 87).
5.
Ensure that the fluid expansion bottle is connected to its
port on the Aqua-Hot, but must be elevated higher than the
Aqua-Hot unit.
6.
Connect the external fluid pump to the fluid fill port.
7. Place the intake hose of the external 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 seriously damage the external heat source.
Fluid Fill Port
Expansion Bottle
Port
Ethylene Glycol
32 25 20
15
10
5
0
-10 -20 -30 -40 -50
0
10 16 21 25 29 33 39 44 48 52 56
Freeze
Point (°F)
Concentra-
tion (%)
NOTE:
The expansion bottle will need to be elevated higher
than the Aqua-Hot unit. Once the fill and purge procedures
are complete, the expansion bottle can be properly mounted
to the side of the Aqua-Hot.
Figure 87
Figure 86
Purging the Interior Heating Loop
In order to provide interior heat to the vehicle, antifreeze
and water heating solution is circulated within an interior
“heating loop” which distributes heat throughout the RV. During
installation, it is possible that air may become trapped within
the heating loop and hamper unit performance.
Follow this procedure to purge any air from the interior
heating loop.
Please note that if an RVC or multiplex system is used in lieu
of the Aqua-Hot display, you must contact the manufacturer, or
connect a display to the on-board RVC network to perform this
procedure.
Purge Procedure:
1.
Locate the fluid expansion tank of the Aqua-Hot. As any air
is purged, it will exit through to this expansion bottle.
2. Locate a gallon of the antifreeze and water heating solution.
This will be used to top-off the fluid expansion bottle as air
is purged from the system.
3. Locate the Aqua-Hot 5in. LCD screen. This display may be
mounted in a location away from the Aqua-Hot. Contact the
vehicle manufacturer for assistance in locating this display.
4. Tap the screen to wake the display.
5. First tap the three lines at the bottom right of the screen,
then tap “AQUA-HOT DIAGNOSTICS”.
6. Tap “TEST” on the display to access the testing
functionality.
7. You will now be displayed the testing screen.
8.
Tap “PUMP” to activate the fluid circulation pump, and if
applicable, “BOOST PUMP” to activate the zone boost pump.
9.
These pumps will run for a maximum of five minutes. Re-
activate as necessary until they are run for at least twenty
minutes.
10.
Refill the fluid expansion bottle as necessary to keep it at
the “COLD” line.
11.
Once this process is complete, mount the fluid expansion
bottle in its permanent location.
Figure 88
Figure 89
