Hayward FD Heater Pressure Switch FDXLWPS1930 Water Pressure Switch Replacement Procedure. FDXLWPS1930 for Universal H-Series (Forced-Draft) Heaters IMPORTANT NOTES: This kit is intended to be used only with Hayward Universal H-Series (forced-draft) gas heater models. These heaters may be identified by inspection of the heater rating plate (there should be an “FD” in the model number), or by visual inspection of the heater in comparison to the diagrams in these instructions. REPLACEMENT PROCEDURE Turn pump, main gas valve, and heater power off. Remove 6 screws and remove the upper plastic heater side panel, to allow access to the header (see Figure 1 for screw locations). Disconnect wires from pressure switch. Remove pressure switch by un-threading it from the header (see Figure 2 for pressure switch location). Install new pressure switch in header. Apply pipe thread sealant to pressure switch threads before assembly. Use care to not cross-thred the pressure switch when threading into the header. Connect wires to new pressure switch. Test operation of the pressure switch and adjust if necessary (see below). Re-install upper plastic heater side panel. TEST / ADJUSTMENT PROCEDURE The pressure switch is preset at the factory for most typical, deck level installations. When the heater
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