Aqua-Hot 375-LP, Installation Manual

Page: 23 / 56

© 2011 Aqua - Hot
®
375 - LP Installation Manual
S
ECTION
3: H
YDRONIC
H
EATING
S
YSTEM
Figure 27
— Page 23 —
Plumbing the Hydronic Heating System:
1. Lay out the plumbing lines for all heat exchang-
ers.
2. Label each line with the heating loop number
and designate 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.
NOTE: Reference Figure 28 for visual instructions on
connecting PEX-type tubing to each heat ex-
changer.
Plumbing heat exchangers in this manner will
allow air to escape naturally. If air is trapped in
any heat exchanger, it will significantly reduce the
heat exchanger’s overall heating performance
(heat output).
NOTE: The inlet and outlet plumbing lines can be installed
with a straight fitting or an elbow fitting.
5. Connect and tighten all interior plumbing lines,
outlet and inlet, to the Aqua-
Hot’s appropriate
heating loop ports. Reference Figure 29 and Fig-
ure 30.
(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 27.
3. Connect and clamp the outlet line from the heat-
er to the lowest port on the heat exchanger with
the longest run, for both heating loops. Refer-
ence figure 27. Then, connect each additional
heat exchanger in the same arrangement