Aqua-Hot 375D, Installation Manual

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© 2008 Aqua-Hot ® 375-D Hydronic Heating System Installation Manual Rev. A
section 3: Hydronic Heating system
Plumbing the Hydronic Heating System:
1. Lay out the plumbing lines for all heat exchangers.
2. Label each line with the heating loop number and des-
ignate as an inlet or an outlet line.
NOTE: Run all plumbing lines in areas where they cannot be
pinched off or damaged under normal operating condi-
tions.
Be sure to secure all lines where necessary and apply
protective shielding in areas where chafing may occur.
Rubber Coated/Closed-Type clamps are recommended
when securing the plumbing lines.
3. Connect and clamp the outlet line from the heater to
the lowest port on the closest heat exchanger for both
heating loops. Reference Figure 23. Then, connect
each additional heat exchanger in the same arrangement
(low to high).
4. Connect and clamp the inlet line from the heater to the
highest port on the last heat exchanger for both heating
loops. Reference Figure 23.
NOTE: Reference Figure 24 for visual instructions on connect-
ing PEX-type tubing to each heat exchanger.
Plumbing heat exchangers in this manner will allow
air to escape naturally. If air is trapped in any heat ex-
changer, it will significantly reduce the heat exchanger’s
overall heating performance (heat output).
5. Connect and tighten all interior plumbing lines, outlet
and inlet, to the Aqua-Hot’s appropriate heating loop
ports. Reference Figures 22 and 25.
NOTE: The inlet and outlet plumbing lines can be installed
with a straight fitting or an elbow fitting.
Mounting
Bracket
Mounting
Bracket
Cozy Heat Exchanger
(Rear View)
Outlet Port
(Highest Port)
Inlet Port
(Lowest Port)
Figure 23