Hayward H-Series Heaters
Hayward has been producing different models of gas heaters under the H-Series label. It can be confusing when you have a problem and find information talking about a Hayward heater but not your specific model.
Universal H-Series
The Universal H-Series consist of the HXXXFDN, HXXXFDP, W3HXXXFDN, and W3XXXFDP models. N denotes Natural Gas, and P denotes propane gas. FD means the heater is Forced Draft using a blower to create air flow.
The H models are Hayward's EXPERT LINE products that are only available through your local pool professional. The W3H models are available through other channels. I believe they are functionally identical and the only difference will be Hayward's warranty.
Cupro nickel is the standard heat exchanger on the Universal H-Series gas heaters. Cupro nickel heat exchangers last longer than standard copper and superior corrosion resistance protects the heat exchanger from damage and premature failure caused by unbalanced water chemistry.
The INSTALLATION, OPERATION, & SERVICE MANUAL for the HXXXFD Series is here.
Altitude of Installation - Heaters may be installed at any altitude up to 10,100 ft above sea level, provided the appropriate modification(s) are performed. The altitudes which require modification vary depending on the model. Parts necessary to convert the heater for outdoor installation at altitudes up to 7,700 ft (minimum) are included with the heater. More information can be found on page 9 and 10 of the Installation Manual.
Universal H-Series Diagnostics Guide provides detailed diagnostics for troubleshooting problems and error codes.
HXXXIDL Models
The HXXIDL heaters are from early 2000 vintage and were replaced by the Universal H-Series heaters. XXX is the BTU rating of the heater in thousands and IDL means "Induced Draft Low NOx". The Installation, Operation, & Service Procedures for the H250IDL2, H350IDL2 & H400IDL2 can be found here. Troubleshooting begins on page 36.
The IDL models use an air blower for the induced draft. There are apparently 4 different blower parts/kits available for the H400IDL2 heater:[1]
- IDXLBWR1930 - Original model w/240V motor which is listed in the manual
- IDXL2BWR1930 - New model w/120V Jakel motor, used in heaters mfg after 9/20/04, (I'm guessing this is the one I have mine is a Jakel motor which says 115V)
- IDXL2BWR1931 - upgrade kit with yet another new blower w/120V Fasco motor, along with a new control board & vacuum switch - which I'm guessing are needed to make the switch from the Jakel to Fasco motor.
- IDXL2BWR1932 - Newest blower w/120V Fasco motor, does not include new control board & vacuum switch - you would only buy this if your heater already has the 120V Fasco motor in it.
The original blower used in these heaters - model IDXLBWR1930 - was a 240V motor. Then in 9/2004 they updated it with a 120V Jakel motor. And then sometime after that (after S/N (21)130701100532001, according to several websites) they switched again to a 120V Fasco motor. The 120V Fasco motor is different from the older 120V Jakel model. The 120V Jakel motor pulls 1.3A and has a 9.0 MFD capacitor, and the newer Fasco motor uses 1.6A and has a 7.5 MFD capacitor.[2]
The heater is equipped with a Hot Surface Ignition Control System that automatically lights the burners. An external power supply is required to power the control system.
Sea Level/high altitude installation - The H-Series IDL heaters may be installed up to 2,000 feet of elevation above sea level.
HXXX Models
The INSTALLATION, OPERATION, & SERVICE MANUAL for the HXXX Series is here.
The HXXX comes in a millivolt model and an electronic ignition model.
The millivolt heater must be lit manually. The millivolt operated heater is equipped with a standing pilot and a thermopile (pilot generator). All of the electric current required to operate the controls within the heater is provided by the pilot generator. No external wiring or electrical connections are required.
The electronic ignition models are lit automatically on each call for heat. The electronic ignition system is equipped with the same basic controls as the millivolt operated heater but a direct spark ignition device (DS) is used to automatically light the main burners on each call for heat. With the DS module these controls operate on 24 volts so an external power source is required.
The HXXX models use a natural draft and do not have an air blower.
