Purging the Heating Loop
Purging the Heating Loop
©Aqua-Hot®
400D Installation Manual
Rev 220504
©Aqua-Hot®
400D Installation Manual
Rev 220504
p. 41
p. 40
First Operation
Aqua-Hot First Operation
Activation Instructions
1. Make sure power supply to the Aqua-Hot is on.
2.
Confirm that the antifreeze and distilled water heating
solution is adequately filled.
3.
Confirm the system and heating loop has been properly
purged of any air.
4.
Make sure to flush the domestic water system thoroughly
with clean water prior to use.
5. Reinstall the Aqua-Hot’s main access cover and the
fastener, which secures the front of the Aqua-Hot’s access
cover to the mounting tray.
6. Move the diesel burner switch to the ON position for
approximately 10 seconds ONLY, then switch it to OFF.
7. After the purge cycle has ended, repeat once more.
8. Move the diesel burner switch to the ON position, and leave
it on in order to activate the diesel burner.
9. Move the Aqua-Hot’s electric element switch to the ON
position in order to supply 120V AC power to the electric
heating element.
10. Allow approximately 1-2 hours for the Aqua-Hot to reach
normal operating temperature (~185°F).
NOTE:
Both the 12V DC diesel burner and the electric
heating element are thermostatically controlled. Either or
both will automatically maintain the temperature of the
boiler tank’s antifreeze and water heating solution.
The Aqua-Hot is now ready for normal operation and use.
NOTE:
The main access cover must be installed prior to
operation. A safety switch (interlock switch) exists, which
will prevent the Aqua-Hot from operating whenever the main
access cover is not properly or securely installed.
NOTE:
This procedure will purge the diesel burner’s fuel
system, by allowing the heater’s fuel pump to complete its
normal 30-150 second shutdown/purge cycle.
NOTE:
It will take approximately 10 seconds before the
diesel burner will ignite and exhaust can be heard exiting
the heater. Allow approximately 10-20 minutes for the Aqua-
Hot to reach normal operating temperature (approximately
190°F).
DO NOT activate the diesel burner until the antifreeze and water
heating solution has been added to the boiler tank, and the heating
system has been completely bled of air. Operating the Aqua-Hot
without the antifreeze and water heating solution will cause serious
damage to the Aqua-Hot boiler tank.
Aqua-Hot Access Panel
Figure 80
Aqua-Hot Switch Panel
Figure 81
Winterizing the Aqua-Hot
Not winterizing the Aqua-Hot when freezing temperatures
are present will result in SERIOUS damage to the Aqua-Hot
domestic water heating system. Ensure that only non-toxic
RV antifreeze (FDA approved “GRAS” antifreeze) rated for
winterization is used when winterizing this unit. The warranty
does not cover freeze damage.
Winterizing the Aqua-Hot
The Aqua-Hot’s domestic water heating system must be
completely drained of domestic water at any time the heater is
stored where freezing temperatures may be experienced.
Please follow these instructions when winterizing the Aqua-
Hot domestic water heating system. Reference Figure 82 for a
system overview.
NOTE:
The Aqua-Hot can continue to be used for interior heat
once the domestic hot water system has been winterized.
1. Completely drain the fresh water storage tank.
2. Disconnect the domestic water demand pump suction line
from the fresh water storage tank.
3. Attach an adequate piece of hose onto the suction side of
the domestic water demand pump.
4. Place the opposite end of the hose into an adequate supply
of non-toxic RV winterization antifreeze (FDA certified as
“GRAS” Generally Recognized As Safe must be used) and
allow the fluid to pump through.
5. Open and close all interior and exterior water faucets one
at a time, until ONLY pure RV antifreeze is present. Perform
this procedure for both cold and hot water faucets.
6. Remove the hose and reconnect the domestic water
demand pump’s suction line to the fresh water storage
tank.
De-Winterization
To de-winterize the Aqua-Hot system, completely fill the fresh
water storage tank. Open and close the interior and exterior
faucets, one at a time, until only clear water is present.
Disinfecting the Domestic Water System
The Aqua-Hot Heating systems contain copper tubing and are
not compatible to prolonged exposure to sodium hypochlorite
(bleach or liquid bleach). Using products containing bleach,
including water refreshers, may cause corrosion of the domestic
water lines, resulting in a catastrophic failure of the Aqua-Hot
system by creating leaks that cannot be repaired. This damage
is not covered by the Aqua-Hot warranty.
If disinfecting the hot water system, be sure to follow NFPA
1192 Standard on Recreational Vehicles “Instructions for
Disinfection of Potable Water Systems” or any other applicable
local standards for Potable Water Systems.
NOTE:
Extended exposure to household bleach will corrode the
components of the Aqua-Hot will potentially dramatically shorten
the operational lifetime of the Aqua-Hot. Under no circumstances
is the Aqua-Hot to be exposed to household bleach for extended
periods of time.
To Hot Water Faucets
Tempered
Domestic Hot Water
Fresh Water
Storage Tank
Cold Water Faucets
Demand Pump
Figure 82
AT
AT
AT
Indicates options for mounting
an Accumulator Tank.
AT
