Heat Exchanger Assembly for Hayward® H350FD Universal H-Series Low Nox Pool Heater FDXLHXA1350
Heat Exchanger Replacement Procedure
Heat Exchanger Service Parts Kits for Universal H-Series (Forced-Draft) Heaters
IMPORTANT NOTES:
REPLACEMENT PROCEDURE
- 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. - This instruction sheet is intended for the following heater
service parts kits:
FDXLHXA1250 Heat Exchanger Assembly, H250FD
FDXLHXA1350 Heat Exchanger Assembly, H350FD
FDXLHXA1400 Heat Exchanger Assembly, H400FD
- Tum pump, main as valve, and heater power off.
- Remove drain plug and drain water out of heat exchanger.
- If necessary, disconnect header union fittings from pool/spa piping.
- Pull temperature limit switch wires through the grommet on the heater side panel. and disconnect limit switch wires from heater wire harness.
- Remove screws and remove both of the upper plastic heater side panels (see Figure 1 for screw locations, and Figure 2 for part locationhdentification).
- Disconnect the 2 wires from the pressure switch. which is located on the inletloutlet header.
- Remove countersunk screws on heater top and remove louvered exhaust panel on heater top (see Figure 2).
- Remove the heater top tlue cover by removing 3 screws on each side of the heater (see Figure 2).
- Remove screws and remove rain shield assembly (see Figure 2). Note that there are screws which hold the
rain shield assembly to the heat exchanger tube sheets, which also must be removed. - Remove the front access panel and the control box cover (see Figure 2).
- Disconnect the temperature sensor plug from the circuit board located inside the control box.
- Pull the temperature sensor wires out of the control box and through the hole in the heater cabinet.
- Carefully lift the heat exchanger up and out of the heater cabinet.
- Before installing the new heat exchanger assembly, install the new adhesive-backed gaskets (included in this kit) onto both ,of the new heat exchanger tubesheets.
- Install the new heat exchanger assembly. Ensure the heat exchanger is properly oriented with the arrows on the tube sheet decal pointing up.
CAUTION: Do not install heat exchanger upside down. Heat exchanger is labeled to indicate the
proper orientation. The heat exchanger will be damaged if installed incorrectly. - Remove the pressure switch from the old heat exchanger assembly and install on the new heat exchanger assembly. Apply pipe thread sealant to the pressure switch threads before assembly.
- Reverse the above steps to reassemble the heater.
- Activate water pump and check the system for leaks.
Warranty Disclaimer
Please be advised that certain manufacturers - including Pentair® (with their TradeGrade® products), Jandy®/Fluidra® (with their Trade Series Exclusive™ products), and Hayward® (with their Expert Line® products) - do not honor manufacturer warranties on specific product lines purchased online.
These policies are intentionally enforced by the manufacturers to prevent customers from purchasing the same products at lower prices online.
Warranty coverage for these products is generally only available when purchased in person from an authorized local dealer.
While we strive to take care of our customers by offering the lowest possible prices on brand new, genuine products, we do not provide warranty coverage ourselves, nor can we guarantee that the manufacturer will honor the warranty on products purchased from our online store.
It is the buyer’s responsibility to confirm warranty eligibility directly with the manufacturer before making a purchase.
If you are a local customer, you may be able to purchase these items in-store and obtain manufacturer warranty coverage. However, for many of our customers across the country, paying significantly more locally just to access a manufacturer warranty often doesn’t make financial sense, especially when some local suppliers charge considerably higher prices.
By completing your purchase, you acknowledge and agree that we are not responsible for warranty support or claims denied by the manufacturer due to their online sales restrictions.
Please be advised that certain manufacturers - including Pentair® (with their TradeGrade® products), Jandy®/Fluidra® (with their Trade Series Exclusive™ products), and Hayward® (with their Expert Line® products) - do not honor manufacturer warranties on specific product lines purchased online.
These policies are intentionally enforced by the manufacturers to prevent customers from purchasing the same products at lower prices online.
Warranty coverage for these products is generally only available when purchased in person from an authorized local dealer.
While we strive to take care of our customers by offering the lowest possible prices on brand new, genuine products, we do not provide warranty coverage ourselves, nor can we guarantee that the manufacturer will honor the warranty on products purchased from our online store.
It is the buyer’s responsibility to confirm warranty eligibility directly with the manufacturer before making a purchase.
If you are a local customer, you may be able to purchase these items in-store and obtain manufacturer warranty coverage. However, for many of our customers across the country, paying significantly more locally just to access a manufacturer warranty often doesn’t make financial sense, especially when some local suppliers charge considerably higher prices.
By completing your purchase, you acknowledge and agree that we are not responsible for warranty support or claims denied by the manufacturer due to their online sales restrictions.
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