Raypak 751 Operations Instructions download pdf (Page 53)

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

1 2 ... 48 49 50 51 52 53 54 55 56 57

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Raypak 751 Operations Instructions Page 53