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10. Connect the flue vent (Category IV venting, UL
1738 Certified Venting Material) to the 15° elbow
of the CHX flue outlet.
11. Connect the PVC pipe (not supplied) for conden-
sate water disposal (check with local authority
regarding condensate disposal).
12. Replace the shroud.
13. Allow the silicone (RTV) to cure over-night.
Vent Switch Adjustment:
In order to ensure proper operation of the ADB boiler
with a CHX attached to it, the vent switch must be
adjusted to proper setting. The vent switch is located
on the J-box, just outside the ignition module. Use the
following steps:
•
Turn power off; disconnect the electrical wiring
and the rubber hose.
•
Remove the switch (it has a black plastic orifice at
the hose connection).
•
On the backside, remove the (purple) seal from
atop the adjusting screw.
•
Turn the plastic hex screw 1-1/2 turn clockwise.
•
Seal with silicone.
•
Reinstall in reverse order.
Table W: CHX Rate of Flow and Pressure Drop
Fig. 39: Connecting Add-on Condensing Heat Exchanger to ADB
53
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