Raypak 751 manual Vent Switch Adjustment

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

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