Aqua-Hot 450-DE Installation Manual page 39

3. Fill the Aqua-Hot completely with the 50/50 mixture
of antifreeze and water heating solution. This will take
approximately 5 gallons; look for the solution to enter
the overflow tube attached to the expansion tank con-
nection on top of the Aqua-Hot.
4. Close the drain valve.
Purging the System by Grounding the Zone
Circulation Pumps:
1. Ensure that the boiler tank has been filled with the
appropriate 50/50 mixture of antifreeze and water
heating solution.
2. Locate the heating zone circulation pumps. Reference
Figures 3 and 50.
3. Take the circulation pump's blue (negative) wire and
disconnect it from the connector of the opposing wire.
Reference Appendix A.
4. Connect an alligator clip to the spade terminal on the
circulation pump's blue (negative) wire and clip the op-
posite end of the cable to a ground source.
Zone 1
Circulation
Pump
Section 10: Purging the System
Zone 2
Figure 50
Circulation
Pump
© 2008 Aqua-Hot ® 450-DE/DM Hydronic Heating System Installation Manual
NOTE: The circulation pump will activate as soon as the pump
is connected to a ground source; therefore, disconnect
the alligator clip from the ground source during the
antifreeze and water heating solution filling procedure.
5. Allow the circulation pump to operate for approxi-
mately 1-3 minutes in order to purge the corresponding
heating loop, then remove the alligator clip from the
ground source.
6. Open the drain valve and completely fill the Aqua-Hot's
boiler tank with additional antifreeze and water heating
solution.
7. Repeat steps 5 and 6 for both heating loops until all
air has been completely bled from the entire heating
system.
NOTE: All air is bled from the heating system when both
plumbing lines are free of air. Reference Figure 19.
8. Once the systems have been purged, disconnect the al-
ligator clips from the ground source and the circulation
pump's wires. Reconnect the pump's wires as originally
configured. Reference Figure 50.
Blue (negative) wire
Spade Terminal
disconnected from the
opposing wire
Opposite end of the
Alligator Cable to be
connected to a ground
source
Zone #1 or Zone #2
Circulation Pump
Red (positive) wire
(will not be disconnected
for the purging
procedure)
Alligator Clip to be
connected to the Blue
Wire's Spade Terminal
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