Airxcel Aqua-Hot 600 Series, Installation Manual

Page: 42 / 63

Purging the Heating Loop
©Aqua-Hot® 600D Installation Manual p. 41
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 coach. 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 RV-C 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 RV-C network to perform this
procedure.
Purge Procedure:
1. Locate the fl uid expansion tank of the Aqua-Hot. As any air
is purged, it will exit through to this expansion tank.
2. Locate a gallon of glycol antifreeze. This will be used to
top-off the fl uid expansion bottle as air is purged from the
system.
3. Navigate to the “PUMPS” page of the “TESTING” section on
the Reporter as displayed below.
4. Tap each of the pumps to independently activate them,
beginning the heating loop purge procedure. These pumps
will remain active for a maximum of 5 minutes. They will
need to be reactivated as needed until the purge procedure
is complete (at least 20 minutes).
5. Continue to fi ll the unit as air is purged from the interior
heating loop.
6. Once the air is no longer returned from the heating zone
return ports, deactivate the fl uid circulation pumps.
7. Open the fl uid drain valve, and activate the external fl uid
fi ll pump. Fill the unit with GRAS propylene glycol antifreeze
and water heating solution until it reaches the “COLD”
mark on the fl uid expansion tank.
Figure 83 Figure 82
Purging the Domestic Water System
Purge Procedure:
1. Ensure that the vehicle’s domestic water pump has 12V DC
power, then activate it by opening each hot water faucet,
one at a time, and running the water until all air is purged
from the domestic water system.
2. Once the domestic water system is completely bled, check
for any leaks in the system.
Verify that the domestic water tank contains fresh
water prior to bleeding the fresh water system of
air.
Cold Fluid Line
NOTE: While using this fi ll method, input from the fl uid level
sensor will be ignored. Take care to ensure that the pumps
are not run while dry.
Zone 1
Circulation Pump
Zone 3
Circulation Pump
Figure 84
Zone 2
Circulation Pump