Installation Guide

Pomona, CA Clemmons, NC Nashville, TN
Tel: [phone] www.haywardpool.com
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
10
FDXLHAK1930 (sold separately) may be necessary.
3. If installing indoors, select the appropriate high-altitude indoor vent pressure switch from the indoor
adapter kit or from the FDXLVPS1931 kit. Each switch has a label which identies which model(s) and
altitude range(s) it is designed for.
4. If connected, turn pump, main gas valve, and heater power off.
5. Remove heater front access door.
6. Remove the 4 #10 hex head screws that fasten the blower air inlet plate to the blower, and remove the
blower air plate and discard. Save the 4 screws as they will be needed to install the new plate.
See Figure 49 (page 47).
7. Install the appropriate blower plate from the kit using the 4 screws. It may be helpful to drive the screws
in and out of the plate outside of the heater rst to “thread” the holes before installing it in the heater.
8. If the installation is congured for indoor venting, a special high-altitude vent pressure switch must be
installed. Follow the instructions for vent kit installation (page 17), but use the appropriate blower air
inlet plate and vent pressure switch for your altitude.
9. Re-install heater front door.
10. If connected, turn pump, main gas valve, and heater power back on.
11. Activate heater and check for proper function.
Table 1 lists the maximum altitudes each model is designed for with: a) no modications, b) the included
conversion plate installed, and c) the accessory conversion kit FDXLHAK1930 installed (sold separately).
TABLE 1
No Modifications
to Heater
Included
Conversion Plate
Installed on
Heater
Conversion kit
FDXLHAK1930
Installed on
Heater
No Modifications
to Heater
Included
Conversion Plate
Installed on
Heater
Conversion kit
FDXLHAK1930
Installed on
Heater
H150FDNNAT 7,700 ft N/A10,100 ft 10,100 ft N/
AN
/A
H150FDPLP7,700 ft N/A10,100 ft 2,000 ft 10,100 ft N/A
H200FDNNAT 10,100 ft N/AN/A 10,100 ft N/
AN
/A
H200FDPLP5,400 ft 10,100 ft N/A2,000 ft 10,100 ft N/A
H250FDNNAT 5,400 ft 10,100 ft N/A2,000 ft 10,100 ft N/A
H250FDPLP2,000 ft 7,700 ft 10,100 ft 2,000 ft 7,700 ft 10,100 ft
H300FDNNAT 10,100 ft N/AN/A 10,100 ft N/
AN
/A
H300FDPLP2,000 ft 10,100 ft N/A2,000 ft 10,100 ft N/A
H350FDNNAT 2,000 ft 10,100 ft N/A2,000 ft 10,100 ft N/A
H350FDPLP2,000 ft 7,700 ft 10,100 ft 2,000 ft 7,700 ft 10,100 ft
H400FDNNAT 10,100 ft N/AN/A 10,100 ft N/
AN
/A
H400FDPLP2,000 ft 7,700 ft 10,100 ft 2,000 ft 7,700 ft 10,100 ft
H500FDN NAT 2,000 ft N/AN/A 2,000 ft N/A N/A
H500FDP LP 2,000 ft N/AN/A 2,000 ft N/A N/A
Indoor Installation *
Maximum Installation Altitude
* All indoor installations at altitudes above 2,000 ft also require a special vent pressure switch to be installed in addition to the blower air inlet plate.
The special vent pressure switch is included with the appropriate indoor vent kit (UHXNEGVT1xxx or UHXPOSHZ1xxx), or the high-altitude vent
pressure switch kit FDXLVPS1931.
Heater ModelGas
Outdoor Installation