Hayward H200FDN Manual

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POOL AND SPA/HOT TUB HEATERS
H150FD, H200FD, H250FD, H300FD,
H350FD & H400FD MODELS

SERVICE & INSTALLATION MANUAL

FOR YOUR SAFETY
WARNING: If the information in these
instructions is not followed exactly, a fire or
explosion may result causing property damage,
injury, or death.

PRINTED 10/24/2011 AT 1:13 PM

- Do not store or use gasoline or other flammable vapors or liquids in the vicinity of this
or any other appliance.

WHAT TO DO IF YOU SMELL GAS:
•
•

Do not try to light any appliance.
Do not touch any electrical switch; do not use
any phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach your gas supplier, call the
fire department.
- Installation and service must be performed by
a qualified installer, service agency, or the
gas supplier.

FOR YOUR SAFETY

This product must be installed and serviced by authorized personnel, qualified in pool/
spa heater installation. Improper installation and/or operation can create carbon monoxide gas
and flue gases that can cause serious injury, property damage, or death.
U.S. PATENT NOS. 6,026,804, 6,321,833, & 7,971,603

1301623301 Rev J 0413

2 CONTENTS
Section I General information............................ 7
Introduction ..................................................... 7
Warranty ......................................................... 7
Maintaining proper water chemistry ................ 7
Section II Installation .......................................... 9
Equipment inspection ..................................... 9
Important notice .............................................. 9
Conformance with codes ................................ 9
Altitude of installation ...................................... 9
Uncrating the heater ..................................... 11
Locating the heater........................................ 11
Flooring ......................................................... 12
Tie-Down Brackets........................................ 12
Indoor Installation and Venting...................... 13
Clearances.................................................... 13
Air Supply...................................................... 13
Vertical Venting.............................................. 15
Horizontal or Vertical Venting........................ 16
Vent Kit Installation........................................ 18
Reversible water connections ....................... 20
Gas supply and piping .................................. 22
Water piping .................................................. 25
Installation above pool surface ..................... 27
Chlorinator/chemical feeder .......................... 27
Drain valve installation (ASME Models)........ 28
Pressure relief valve ..................................... 28
Electrical specifications................................. 28
Electrical connections ................................... 29
Remote control connection ........................... 30
Section III Check-out & Start-up ...................... 33
General ......................................................... 33
Gas line testing ............................................. 33
Gas pressure testing .................................... 34
Water pressure switch .................................. 35
Two-speed pump .......................................... 35
Temperature adjustment ............................... 36
Temperature lock-out .................................... 37
Fahrenheit v. Celsius .................................... 37
Heating mode ............................................... 37
Retry (Failure of light) ................................... 38
Recycle (Loss of flame) ................................ 38
Keypad inputs ............................................... 38
Automatic reset time ..................................... 39
Periodic inspection ....................................... 39
Winterization ................................................. 39
Draining the heat exchanger ........................ 40
Spring start-up .............................................. 40

Section IV Technician Service ......................... 41
General ......................................................... 41
Maintenance ................................................. 41
Heat exchanger inspection and cleaning ...... 42
Combustion chamber ................................... 42
Heat exchanger removal .............................. 42
Burner inspection and cleaning .................... 42
Burner removal and replacement ................. 43
Gas valve replacement ................................. 43
Igniter ............................................................ 44
Flame sensor ................................................ 44
Burner orifices .............................................. 44
Gas conversion ............................................. 45
Electrical wiring ............................................. 45
Ignition control system .................................. 46
Blower vacuum switch................................... 46
High limit switch ............................................ 47
Thermistor..................................................... 48
Water pressure switch .................................. 48
Transformer .................................................. 49
Blower ........................................................... 49
By-pass service cartridge ............................. 49
Section V Troubleshooting .............................. 50
General ......................................................... 50
Automatic reset time ..................................... 50
Supply wiring ................................................ 50
Internal wiring ............................................... 51
Fuse specifications ....................................... 51
Error codes.................................................... 52
Troubleshooting ............................................ 54
Warranty........................................................ 58
Service Parts................................................. 60

USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
www.haywardpool.com

SAFETY INFORMATION
Basic safety precautions should always be followed, including the following: Failure to follow instructions
can cause severe injury and/or death.

This is the safety-alert symbol. When you see this symbol on your equipment or in this manual, look for
one of the following signal words and be alert to the potential for personal injury.
WARNING warns about hazards that could cause serious personal injury, death or major property damage and if ignored presents a potential hazard.
CAUTION warns about hazards that will or can cause minor or moderate personal injury and/or property damage and if ignored presents a potential hazard. It can also make consumers aware of actions that
are unpredictable and unsafe.
ATTENTION indicates special instructions that are important but not related to hazards.
READ AND FOLLOW ALL INSTRUCTIONS IN THIS OWNER’S
MANUAL AND ON EQUIPMENT.
IMPORTANT SAFETY INSTRUCTIONS
Before installing or servicing this electrical equipment, turn power supply OFF.
KEEP SAFETY LABELS IN GOOD CONDITION AND REPLACE IF MISSING OR DAMAGED.
WARNING – To reduce risk of injury, do not permit children to use or climb on the heater, pumps or
filters. Closely supervise children at all times. Components such as the filtration system, pumps, and
heaters must be positioned to prevent children from using them as a means of access to the pool.
CAUTION – This heater is intended for use on permanently installed swimming pools and may also
be used with spas. Do NOT use with storable pools. A permanently installed pool is constructed in or
on the ground or in a building such that it cannot be readily disassembled for storage. A storable pool is
constructed so that it is capable of being readily disassembled for storage and reassembled to its original
integrity.
Though this product is designed for outdoor use, it is strongly recommended to protect the electrical
components from the weather. Select a well drained area, one that will not flood when it rains. It requires free
circulation of air for cooling. Do not install in a damp or non-ventilated location.
WARNING – It is required that licensed electricians do all electrical wiring. Risk of
Electric Shock. Hazardous voltage can shock, burn, cause death or serious property
damage. To reduce the risk of electric shock, do NOT use an extension cord to connect
unit to electric supply. Provide a properly located outlet. All electrical wiring MUST be
in conformance with applicable local and national codes and regulations. Before working on this unit, turn off power supply to the heater.
WARNING – To reduce the risk of electric shock replace damaged wiring immediately. Locate conduit
to prevent abuse from lawn mowers, hedge trimmers and other equipment.
WARNING – Failure to bond to pool structure will increase risk for electrocution and could result in
injury or death. To reduce the risk of electric shock, the electrician must comply with installation instructions and must bond the heater accordingly. In addition, the licensed electrician must also conform
to local electrical codes for bonding requirements.
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
www.haywardpool.com

NOTES TO THE ELECTRICIAN:

Use a solid copper conductor, size 8 or larger. Run a continuous wire from external bonding lug to reinforcing rod or mesh. Connect a No. 8 AWG solid copper bonding wire to the grounding lug provided on the
heater and to all metal parts of swimming pool or spa, and to all electrical equipment, metal piping (except
gas piping), and conduit within 5 ft. (1.5 m) of inside walls of swimming pool or spa. IMPORTANT -Reference NEC codes for all wiring standards including, but not limited to, grounding, bonding and other general
wiring procedures.
WARNING – Suction Entrapment Hazard.
Suction in suction outlets and/or suction outlet covers which are damaged, broken,
cracked, missing, or unsecured can cause severe injury and/or death due to the following
entrapment hazards:
Hair Entrapment- Hair can become entangled in suction outlets.
Limb Entrapment- A limb inserted into an opening of a suction outlet or suction outlet
cover that is damaged, broken, cracked, missing, or not securely attached can result in a
mechanical bind or swelling of the limb.
Body Suction Entrapment- A differential pressure applied to a large portion of the body or limbs can
result in an entrapment.
Evisceration/ Disembowelment - A vacuum applied directly to the intestines through an unprotected
suction outlet sump or suction outlet cover which is damaged, broken, cracked, missing, or unsecured
can result in evisceration (disembowelment).
Mechanical Entrapment- There is potential for jewelry, swimsuit, hair decorations, finger, toe or knuckle to be caught in an opening of a suction outlet or suction outlet cover resulting in mechanical entrapment.

•
•
•
•

WARNING - To reduce the risk of entrapment hazards:
• When suction outlets are less than a 18” x 23” equivalent, a minimum of two functioning suction outlets per pump must be installed. Suction outlets in the same plane (i.e.
floor or wall), must be installed a minimum of three feet (3’) [1 meter] apart, as measured from near point to near point.
• Dual suction outlets shall be placed in such locations and distances to avoid “dual
blockage” by a user.
• Dual suction fittings shall not be located on seating areas or on the backrest for such
seating areas.
The maximum system flow rate shall not exceed the flow rating of any listed (per current revision of
ASME/ANSI A112.19.8) suction outlet cover installed.
Never use the Pool or Spa if any suction outlet component is damaged, broken, cracked, missing, or
not securely attached.
Replace damaged, broken, cracked, missing, or not securely attached suction outlet components immediately.
Install two or more suction outlets per pump in accordance with latest APSP (formally NSPI) Standards and CPSC guidelines. Follow all applicable National, State, and Local codes.
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
www.haywardpool.com

WARNING – Failure to remove pressure test plugs and/or plugs used in winterization of the pool/spa
from the suction outlets can result in an increase potential for suction entrapment as described above.
WARNING – Failure to keep suction outlet components clear of debris, such as leaves, dirt, hair, paper
and other material can result in an increase potential for suction entrapment as described above.
WARNING – Suction outlet components have a finite life, the cover/grate should be inspected frequently and replaced at least every ten years or if found to be damaged, broken, cracked, missing, or not
securely attached.
WARNING – All suction and discharge valves MUST be OPEN when starting the circulation system.
Failure to do so could result in severe personal injury and/or property damage. All drains and suction
outlets MUST have properly installed covers, securely attached using the screws supplied with the covers. If screws are lost, order replacement parts from your supplier.
WARNING – Hazardous Pressure. Pool and spa water circulation systems operate
under hazardous pressure during start up, normal operation, and after pump shut off.
Stand clear of circulation system equipment during start up. Failure to follow safety
and operation instructions could result in violent separation of the pump housing and
cover due to pressure in the system, which could cause property damage, severe personal injury, or death. Before servicing pool and spa water circulation system, all system and pump controls must be in off position and filter manual air relief valve must
be in open position. Before starting system pump, all system valves must be set in a
position to allow system water to return back to the pool. Do not change filter control
valve position while system pump is running. Before starting system pump, fully open
filter manual air relief valve. Do not close filter manual air relief valve until a steady
stream of water (not air or air and water) is discharged.
WARNING – Separation Hazard. Failure to follow safety and operation instructions
could result in violent separation of pump components. Strainer cover must be properly secured to pump housing with strainer cover lock ring. Before servicing pool and
spa circulation system, manual air relief valve must be in open position. Do not operate pool and spa circulation system if a system component is not assembled properly,
damaged, or missing. Do not operate pool and spa circulation system unless filter air
relief valve body is in locked position in filter upper body.
WARNING – Never operate or test the circulation system at more than 40 PSI.
WARNING – Fire and burn hazard. Motors operate at high temperatures and if they are not properly
isolated from any flammable structures or foreign debris they can cause fires, which may cause severe
personal injury or death. It is also necessary to allow the motor to cool for at least 20 minutes prior to
maintenance to minimize the risk of burns.
WARNING – Failure to install according to defined instructions may result in severe personal injury or
death.

USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
www.haywardpool.com

6
WARNING – The following “Safety Rules for Hot Tubs” recommended by the U.S. Consumer
Product Safety Commission should be observed when using the spa.
1. Spa or hot tub water temperatures should never exceed 104°F [40°C]. A temperature of 100°F
[38°C] is considered safe for a healthy adult. Special caution is suggested for young children. Prolonged immersion in hot water can induce hyperthermia.
2. Drinking of alcoholic beverages before or during spa or hot tub use can cause drowsiness, which
could lead to unconsciousness and subsequently result in drowning.
3. Pregnant women beware! Soaking in water above 100°F [38°C] can cause fetal damage during the
first three months of pregnancy (resulting in the birth of a brain-damaged or deformed child). Pregnant women should adhere to the 100°F [38°C] maximum rule.
4. Before entering the spa or hot tub, users should check the water temperature with an accurate thermometer; spa or hot tub thermostats may err in regulating water temperatures by as much as 4°F
(2.2°C).
5. Persons taking medications, which induce drowsiness, such as tranquilizers, antihistamines or anticoagulants, should not use spas or hot tubs.
6. If the pool/spa is used for therapy, it should be done with the advice of a physician. Always stir pool/
spa water before entering the pool/spa to mix in any hot surface layer of water that might exceed
healthful temperature limits and cause injury. Do not tamper with controls, because scalding can
result if safety controls are not in proper working order.
7. Persons with a medical history of heart disease, circulatory problems, diabetes or blood pressure
problems should obtain a physicians advice before using spas or hot tubs.
8. Hyperthermia occurs when the internal temperature of the body reaches a level several degrees
above normal body temperature of 98.6°F [37°C]. The symptoms of Hyperthermia include: drowsiness, lethargy, dizziness, fainting, and an increase in the internal temperature of the body.
The effects of Hyperthermia include:
1. Unawareness of impending danger.
2. Failure to perceive heat.
3. Failure to recognize the need to leave the spa.
4. Physical inability to exit the spa.
5. Fetal damage in pregnant women.
6. Unconsciousness resulting in danger of drowning.
DEFINITIONS:
Suction Outlet –
Inches of
Mercury (in Hg) Main Drain –
PSI –

The term Suction Outlet is a fitting, fitting assembly, cover/grate and related components that provide a means for water to exit the pool and into the pump circulating
system.
A unit for measuring pressure below atmospheric (“suction” or “vacuum”) (1.0 inch
Hg = .491 PSI)
See Suction Outlet
An abbreviation for pounds per square inch.

USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
www.haywardpool.com

SECTION I.

GENERAL INFORMATION

INTRODUCTION:

This manual contains instructions for installation, operation, maintenance, troubleshooting, and parts lists
for the safe use of the swimming pool/spa/hot tub heaters. Hayward strongly recommends that the installer
read the manual before installing the swimming pool/spa/hot tub heater. If after reviewing the manual any
questions remain unanswered, contact the factory or local representative. Following heater installation, the
installer should leave all manuals with the consumer for future reference.

LIMITED WARRANTY SUMMARY:

Hayward warrants the pool/spa/hot tub heater to be free from defects in materials and workmanship, and
will within one year from date of installation for all users, for the original purchaser, repair or, at our option,
replace without charge any defective part. Hayward further warrant that if the heat exchanger or exchanger
headers (water-containing section) leak within one year from date of such installation for all users, due to
defects in materials and workmanship, Hayward will provide a replacement part. Cost of freight, installation,
fuel, and service labor (after one year) is at user’s expense. For full details of warranty agreement, see warranty certificate included in this manual.
ATTENTION: If the pool/spa/hot tub heater is damaged or destroyed by improper maintenance, excessive water hardness, incorrect water chemistry, or freezing it is not covered under the manufacturer’s
warranty.

MAINTAINING PROPER WATER CHEMISTRY:
WARNING:

Failure to Maintain Proper Water Chemistry May Cause
Premature Heat Exchanger Damage or Failure

The heat exchanger in your Hayward pool heater is made from the highest quality of copper and nickel
(Cupronickel) materials. The premium materials and the exacting processes used in the manufacture of the
heat exchanger is state of the art in pool heater design and manufacture. Yet, it remains vital that the heat exchanger be protected from damaging or corrosive chemicals, insufficient water flow or improperly balanced
water chemistry. Heat exchanger damage or failure resulting from improper flow, improperly balanced pool
water or the improper addition of sanitizers into the water is NOT covered under the terms of your warranty.
The following factors are critical to heat exchanger protection. Follow these guidelines to help prevent
pre-mature damage or failure to your heater and heat exchanger.
1. WATER FLOW THROUGH HEATER
Water must be flowing through the heater at the minimum rated flow rate during operation. Check that
the pump is operating and the system is filled with water and purged of all air prior to starting the heater. The
minimum rated flow rates are listed on page 26. Some installations may require an adjustment to the water
pressure switch for proper low-flow protection. Test your system and if necessary, adjust the water pressure
switch as described on page 35.

USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
www.haywardpool.com

8
2. POOL/SPA WATER CHEMISTRY
The chemistry balance and mineral content of swimming pool water changes daily due to the addition of
pool and sanitizing chemicals, bather loads, rain, runoff and the amount of sun - to name a few. Improper chemistry balance and mineral content can cause scaling and deposits to form on pool walls, in the filtration system,
in the heat exchanger tubes and additionally can promote corrosive action to all metals in the water path. Changing spa water regularly and maintaining the correct chemical balance in your pool/spa will keep the pool/spa
safe and sanitary, and will help protect the heat exchanger. Use a 4-way pool/spa water test kit to check your
water frequently (at least weekly). Use the following guidelines to help protect your heater’s heat exchanger:
Recommended
Level

Effect of Low Levels

Effect of High Levels

hazy water, algea growth,
bacteria causing infections

swimmer irritation, bleaching of clothes/hair,
corrosive to heat exchanger

Chlorine

1 - 3 ppm

Bromine

2 - 4 ppm

7.4 - 7.6

corrosive to heat exchanger,
swimmer irritation

cloudy water, scaling of heat exchanger,
reduced sanitizer effectiveness

Total Alkalinity

80 - 120 ppm

corrosive to heat exchanger,
large fluctuations in pH

scaling of heat exchanger

Calcium Hardness

200 - 400 ppm

corrosive to heat exchanger

scaling of heat exchanger

Salt

2700 - 5000 ppm

poor salt chlorinator performance

corrosive to heat exchanger

3. SKIMMER CHLORINATION
Placing chlorine or bromine tablets directly into the skimmer may result in high chemical concentrations
flowing through the heater. DO NOT place chlorine or bromine tablets in the skimmer.
4. CHLORINATOR INSTALLATION
Chlorinators must be installed downstream of the heater, and a check valve must be installed between the
heater and chlorinator to prevent high chemical concentrations from back flowing into the heater. Make sure your
piping arrangement meets the chlorinator installation requirements shown on page 27.
5. BYPASS
Until water chemistry is properly balanced, and if your piping has a bypass valve installed for the heater,
open the bypass so that corrosive and potentially damaging water will not flow through the heater and therefore the heat exchanger. Close the bypass valve once the water is properly balanced. Failure to close the
bypass valve when attempting to operate the heater will result in extensive damage to the heat exchanger.
Ensure water flow through the heater is restored before operating the heater. A bypass feature is also advantageous for service needs and for the ability to remove the heater from the water path when not heating. Refer
to page 26 for further information.

USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
www.haywardpool.com

SECTION II. INSTALLATION

EQUIPMENT INSPECTION:
On receipt of the heater, inspect the heater carton(s) for damage. If any carton(s) is damaged, note it when
signing for it. Remove the heater from the carton(s) inspect it and advise the carrier of any damages at once.
IMPORTANT NOTICE:
The installation instructions are intended for the use of a qualified technician, specifically trained and
experienced in the installation of this type of heating equipment. Some states or provinces require that installation be licensed. If this is the case in the state or province where heater is located, the contractor must be
properly licensed.
WARNING: Failure to comply with the appliance and vent package installation instructions and service
instructions in this manual may result in equipment damage, fire, asphyxiation, or carbon monoxide poisoning. Exposure to products of incomplete combustion (carbon monoxide) can cause cancer and birth
defects or other reproductive harm.
CONFORMANCE WITH CODES:
The heater shall be installed in accordance with all local and state codes. The heater installation must conform to the latest edition of the National Fuel Gas Code (ANSI Z223.1/NFPA 54) and with the requirements of
the authority having jurisdiction. Design certification of the heater is in compliance with ANSI Z21.56/CSA 4.7.
For Canadian installations, the heater is to be installed in accordance with the standards CAN/CGA B149.1
and B149.2 – Installation Codes for Gas Burning Appliances and Equipment and/or local codes and, if applicable, CSA C22.1 – Canadian Electrical Code, Part I.
ALTITUDE OF INSTALLATION:
The heater 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. Conversion is accomplished by replacement of the blower air inlet plate, and for indoor applications, installation of a special vent pressure switch. The blower air inlet plates are clearly marked with
the compatible heater model(s), vent configuration(s), and altitude range(s). Care should be taken to verify
the correct plate (and vent pressure switch, when applicable) is being used to ensure proper heater performance. The vent pressure switch should be provided with the indoor adapter kit, or if you have an older
indoor adapter kit, order p/n FDXLVPS1931 for the high-altitude indoor vent pressure switch.
High-Altitude Conversion Procedure:
1. Identify the altitude of the installation site. This may be done using a GPS device, or by looking up the
altitude for the geographic location. Altitudes for all locations in the United States and Canada may be
found using the zip/postal code database at www.zip-codes.com. If the altitude for the installation site
is greater than 10,100 ft, the heater may not be installed. Note that if installing outdoors, some
Universal H-Series heaters may be compatible with your altitude without modification. Table 1 lists the
altitude ranges for heaters without modification. All indoor heaters installed above 2,000 ft require a
special vent pressure switch.
2. Select the appropriate blower air inlet plate to use based on the heater model, vent configuration
(outdoor or indoor), and altitude needed. Extra plate(s) are included with the heater, packaged in the
plastic bag with this manual. Each plate has a label which identifies which model(s), vent
configuration(s), and altitude range(s) it is designed for. Table 1 lists the maximum installation
altitudes using the included conversion plate(s). If installing above 7,700 ft, the high-altitude kit
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
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Tel: 908-351-5400
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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 identifies 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 first to “thread” the holes before installing it in the heater.
8. If the installation is configured 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 modifications, b) the included
conversion plate installed, and c) the accessory conversion kit FDXLHAK1930 installed (sold separately).
TABLE 1
Maximum Installation Altitude
Outdoor Installation
Heater Model

H150FDN

Gas

NAT

Indoor Installation *

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

7,700 ft

N/A

10,100 ft

N/A

H150FDP

7,700 ft

N/A

10,100 ft

2,000 ft

10,100 ft

N/A

H200FDN

NAT

10,100 ft

N/A

10,100 ft

N/A

H200FDP

5,400 ft

10,100 ft

N/A

2,000 ft

10,100 ft

N/A

H250FDN

NAT

5,400 ft

10,100 ft

N/A

2,000 ft

10,100 ft

N/A

H250FDP

2,000 ft

7,700 ft

10,100 ft

2,000 ft

7,700 ft

10,100 ft

H300FDN

NAT

10,100 ft

N/A

10,100 ft

N/A

H300FDP

2,000 ft

10,100 ft

N/A

2,000 ft

10,100 ft

N/A

H350FDN

NAT

2,000 ft

10,100 ft

N/A

2,000 ft

10,100 ft

N/A

H350FDP

2,000 ft

7,700 ft

10,100 ft

2,000 ft

7,700 ft

10,100 ft

H400FDN

NAT

10,100 ft

N/A

10,100 ft

N/A

H400FDP

2,000 ft

7,700 ft

10,100 ft

2,000 ft

7,700 ft

10,100 ft

* 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.

USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
www.haywardpool.com

11
UNCRATING THE HEATER:
Figure 1
To remove the shipping carton from the heater:
1. Remove the corrugated carton from the
heater. The carton, top pad, bottom pad, and
the four corner posts can be recycled.
2. There are three (3) screws total used to secure the heater to the wood pallet. All three
must be removed to separate the heater from
the pallet. One (1) is located in the lower
rear of the heater as shown in Figure 1.
3. To access the other two (2) screws, open the
front access panel by removing the four (4)
black phillips-head screws. Then remove
the two (2) screws which hold the
Figure 2
heater base pan to the pallet as
shown in Figure 2.
4. Lift the heater clear of the corrugated bottom pad and off of the pallet.
ATTENTION: Do not drop the
heater from a pickup truck tailgate
to the ground. This may damage the
heater.

The screw through the
rear shipping bracket
is located in this area.
Remove the screw.
It is not necessary to
remove the bracket or
the rear louvered panel.

Remove the (2)
shipping screws
and discard bottom
corrugated tray.

LOCATING THE HEATER:
Locate the pool/spa/hot tub heater in an area where leakage of the heat exchanger or connections will not
result in damage to the area adjacent to the heater or to the structure. When such locations cannot be avoided,
it is recommended that a suitable drain pan, with drain outlet, be installed under the heater. The pan must not
restrict airflow.
This heater must be installed at least (5) feet from the inside wall of a pool (in-ground or aboveground)/
spa/hot tub unless separated from the pool/spa/hot tub by a solid barrier.
The heater must be installed such that the location of the exhaust gas vent assembly outlet relative to
adjacent public walkways, adjacent buildings, openable windows, and building openings complies with the
National Fuel Gas Code (ANSI Z223.1/NFPA 54) and/or CAN/CGA B149 installation codes. Outdoor installation and service clearances:
The heater must be installed outdoors such that the installation and service clearances from combustible
materials shown in Table 2 are maintained. This heater may be installed on combustible floors.
1. The heater is self-venting when installed outdoors and does not require additional vent piping.
2. Do not install in a location where growing shrubs may in time obstruct a heater’s combustion air
and venting areas.
3. Do not install this appliance under an overhang less than (3) feet from the top of the appliance.
The area under the overhang must be open on (3) sides.
4. Do not install the heater where water spray from ground sprinkler can contact the heater. The water could splash on the controls causing electrical damage.
5. Do not install under a deck.
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12
6. Do not install within 24” of any outdoor
Table 2
HVAC equipment.
Outdoor Installation Clearances
7. Do not install where water may run-off a
Heater Panel
Required Clearance
roof into the heater. A gutter may be needed
Top
Unobstructed
to protect the heater.
Front
24 inches
8. Any enclosure around the heater must
Back
6 inches
provide a combustion air vent commencing
Water
Connection
Side
12
inches
within 12 inches of the bottom of the encloSide Opposite Water Connection
6 inches
sure. The vent opening shall have a minimum free area of 1 square inch per 4,000
btu/hr input rating of all gas appliances in the enclosure. See Table 5.

FLOORING:

This heater may be installed on either non-combustible or combustible flooring. Ultralite™ or equivalent
concrete-over-foam HVAC pads are acceptable.

TIE-DOWN BRACKETS:

The heater is equipped for installation of factory-supplied tie-down brackets if required by local codes.
The brackets are shipped in the consumer kit. You will need the following to complete the installation:
1. Tie-down brackets (FACTORY-SUPPLIED, quantity = 4)
2. Sheet metal screws (FACTORY-SUPPLIED, quantity = 4)
3. Concrete tapping screws (tapcons) (field-supplied, quantity = 4, size to be ¼” diameter with a
minimum length of 2”)

INSTALLING TIE-DOWN BRACKETS:
1.
2.
3.
4.
5.

7.
8.
9.

Locate the tie-down brackets and the sheet metal screws.
Obtain the tap-cons. Be sure the overall length of the concrete tapping screw is at least 2”.
Remove the front access panel (4 screws).
Remove the rear access panel (4 screws).
Figure 3
Position the heater on the pad so that all tapInstall sheet metal screws (supplied) at
cons can “bite” into the pad. Observe local codes
these locations (front and rear)
regarding pad construction, some jurisdictions
specify a minimum thickness for concrete pads.
Slip the tie-down brackets into the slots in the
front of the heater base pan from underside of
the heater, so that they are positioned as shown
in figure 3. Install the sheet metal screws through
the holes in the bracket to secure the bracket to
the heater base pan.
Install the tap-cons through the holes in the tiedown brackets into the pad.
Equipment pad
Repeat Steps 6 & 7 at the rear of the heater.
Installation is completed when (4) brackets are
Install concrete tapping screws (field-supplied)
secured to the heater and the pad. Install the acat these locations (front and rear)
cess panels when complete.

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INDOOR INSTALLATION AND VENTING
POSITIVE AND NEGATIVE PRESSURE VENTING SYSTEMS
The heater is designed such that it may be vented using either a negative-pressure or a positive-pressure
venting system. The appropriate system of venting for a particular site will depend on many factors such as
vent termination needs (horizontal/vertical), and the cost of venting system. Table 3 lists the indoor venting
kits available and the limitations of each system.
Table 3
Indoor Vent Kits and Limitations of Venting Systems
Indoor Vent Kit Part
Number

Description

UHXNEGVT11501

For Use With
Heater
Models

Vent Pipe Limitations

50 ft max vetical height,

Negative Pressure,

H250FD

25 ft max horizontal length

UHXNEGVT13001

Vertical Venting

H300FD

UHXNEGVT13501

Applications

UHXNEGVT12501

Indoor Vent Adapter Kit,

H350FD

UHXNEGVT14001

H400FD

UHXPOSHZ11501

H150FD

UHXPOSHZ12001

Indoor Vent Adapter Kit,

H200FD

(horizontal length cannot
exceed 1/2 of vertical height),
3 elbows max

Single or Double Vertical Only,
Wall Galvanized

Termination Above

Non-Sealed

Roof of House/

Vent Pipe

Building

50 ft max with 1 elbow,

Single or Double

UHXPOSHZ12501

Positive Pressure,

H250FD

40 ft max with 2 elbows,

Wall Stainless

UHXPOSHZ13001

Horizontal or Vertical

H300FD

or 30 ft max with 3 elbows

Steel Sealed

(horizontal or vertical)

Vent Pipe

UHXPOSHZ13501
UHXPOSHZ14001

CLEARANCES

Venting Applications

H350FD

Horizontal or
Vertical, Termination Immediately
Outside Wall of
House/Building

H400FD

The heater must be installed such that the installation and
service clearances from combustible materials shown in Table
4 are maintained. This heater may be installed on combustible
floors. Do not install heater in a closet.

AIR SUPPLY

Vent
Termination
Requirement

H150FD
H200FD

UHXNEGVT12001

Vent Pipe
Material

Table 4
Indoor Installation Clearances
Heater Panel

Required Clearance

Top

36 inches

Front

24 inches

Back

6 inches

Water Connection Side

12 inches

Indoor installations and outdoor shelters (confined spaces)
Side Opposite Water
6 inches
must be provided with adequate combustion and ventilation air
Connection
vents to assure proper heater operation. These vents must be
sized according to the requirements stated in paragraph A or B below (whichever applies to the installation).
These vents must never be obstructed when heater is in operation.
When air blowers are used in spa/hot tub installations and are located in proximity to the heater, caution
must be observed to ensure sufficient combustion air is available to the heater for proper combustion. A separate
blower air duct is recommended.
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(A) ALL AIR SUPPLY FROM INSIDE THE BUILDING:

The confined space shall be provided with 2 permanent openings communicating directly with an additional room(s) of sufficient volume so that the combined volume of all spaces meets the criteria for an unconfined space (a space whose volume is not less than 50 cubic feet per 1,000 btu/hr). The total input of all gas
utilization equipment installed in the combined space shall be considered in making the determination. Each
opening shall have a minimum free area of 1 square inch per 1,000 btu/hr of the total input rating of all gas
utilization equipment in the confined space, but not less than 100 square inches. See Table 5. One opening
shall be within 12 inches of the top and and one within 12 inches of the bottom of the enclosure.

(B) ALL AIR SUPPLY FROM OUTDOORS:

Figure 4
Figure 9
Below-Ground
(Pit)
Installation
Below-Ground (Pit)
Installation

Air Duct from
Ground to Base

The confined space shall be provided with 2 permanent
openings, once commencing within 12 inches of the bottom
of the enclosure. The opening shall communicate directly,
Vent Cap
or by ducts, with the outdoors or spaces (crawl or attic) that
Ventilation
Combustion
Air
Ground Level
Air
freely communicate with the outdoors.
1. When communicating with the outdoors (either directly or through vertical ducts), each opening shall
Rise of 1 inch
per foot
have a minimum free area of 1 square inch per 4,000
btu/hr of total input rating of all equipment in the
enclosure. See Table 5.
Drip Tee
2. When communicating with the outdoors through horizontal ducts, each opening shall have a minimum free
Gas Cock
area of 1 square inch per 2,000 btu/hr of total input
rating of all equipment in the enclosure. See Table 5.
3. When ducts are used, they shall be of the same crosssectional area as the free area of the openings to
Sediment Trap
Level Flooring
or Slab
which they connect. The minimum dimension of rectangular air ducts shall not be less
Table 5: Combustion and Ventilation Air Requirements
than 3 inches.
4. When installing a heater below
Free Area per Btu
Total Input
Combustion Air Free
Ventilation Air Free
Requirement
(btu/hr)
Area Required (sq. in.) Area Required (sq. in.)
ground (in a pit), combustion and
150,000
150
150
1 sq. in. per 1,000 btu/hr
ventilation air openings must be
200,000
200
200
(paragraph A)
provided as shown in Figure 4.
250,000
250
250
300,000
300
300
Each opening shall have a mini350,000
350
350
mum free area of 1 square inch per
400,000
400
400
150,000
75
75
250 btu/hr or total input rating of
1 sq. in. per 2,000 btu/hr
200,000
100
100
(paragraph B-2)
all equipment in the pit. See Table
250,000
125
125
300,000
150
150
5. Below-ground (pit) installations
350,000
175
175
must be natural gas only.
400,000
200
200
For more detailed methods of providing air for combustion and ventilation,
refer to the latest edition of the National
Fuel Gas Code (ANSI Z223.1/NFPA 54).

1 sq. in. per 4,000 btu/hr
(paragraph B-1)

1 sq. in. per 250 btu/hr
(paragraph B-4)

150,000
200,000
250,000
300,000
350,000
400,000
150,000
200,000
250,000
300,000
350,000
400,000

37.5
50
62.5
75
87.5
100
600
800
1000
1200
1400
1600

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VERTICAL VENTING – NEGATIVE PRESSURE
VENT SIZING
Size the vent pipe according to the venting
tables in the National Fuel Gas Code (ANSI
Z223.1/NFPA 54) for a Category I gas appliance
using single-wall or double-wall (Type B) gas
vent. Vent pipe diameter should not be less than
the size of the vent pipe adapter on the heater
(see Table 6). The maximum vent height cannot exceed 50 ft. The total lateral (horizontal)
length cannot exceed 1/2 of the total vent height.
The system may have up to 3 90-degree elbows
maximum. Single-wall vent may be used in
conditioned spaces only. Clearance to combustible materials for single-wall vent is 9 inches.
Double-wall (Type B) vent must be used in nonconditioned spaces.

Table 6
Vent Pipe Diameters for
Negative-Pressure Indoor Vent Kits
Indoor Vent Kit
Part Number

Heater Model

Vent Pipe
Diameter

UHXNEGVT11501

H150FD

6 inch

UHXNEGVT12001

H200FD

6 inch

UHXNEGVT12501

H250FD

6 inch

UHXNEGVT13001

H300FD

8 inch

UHXNEGVT13501

H350FD

8 inch

UHXNEGVT14001

H400FD

8 inch

VENT TERMINATION
Vent extending through a roof or wall must be listed double-wall (Type B) vent, and pass through an
approved roof jack, or roof thimble. A listed vent cap must be used. Gas vents that are spaced less than 8 ft
horizontally from a vertical wall or similar obstruction shall terminate not less than 2 ft above any portion
of a building within 10 ft. Gas vents that are spaced 8 ft or more horizontally from a vertical wall or similar
obstruction shall terminate above the roof a distance H based on the roof pitch. Using the roof pitch, find the
minimum value of H using Figure 5 and Table 7.
Table 7
Height Requirements for Vent Caps
Figure 5
Minimum Height from Roof for Vent Cap
Listed
cap

Lowest discharge opening

Listed gas
vent

x
12
Roof pitch is x/12
H (minimum)Minimum height from roof
to lowest discharge opening

(see Figure 5)

Roof Slope

Min. Height H from Roof to
Lowest
Discharge Opening

Flat to 6/12

1.0 ft

Over 6/12 to 7/12

1.25 ft

Over 7/12 to 8/12

1.5 ft

Over 8/12 to 9/12

2.0 ft

Over 9/12 to 10/12

2.5 ft

Over 10/12 to 11/12

3.25 ft

Over 11/12 to 12/12

4.0 ft

Over 12/12 to 14/12

5.0 ft

Over 14/12 to 16/12

6.0 ft

Over 16/12 to 18/12

7.0 ft

Over 18/12 to 20/12

7.5 ft

Over 20/12 to 21/12

8.0 ft

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HORIZONTAL OR VERTICAL VENTING – POSITIVE PRESSURE
VENT SIZING
Vent pipe diameter must match the vent pipe diameter on the heater (see Table 9). The vent pipe must be
Heatfab single or double-wall stainless steel sealed vent as listed in Table 9. Double-wall vent must be used
in non-conditioned spaces. The maximum total length of vent pipe, and number of 90-degree elbows cannot
exceed the limits specified in Table 8.
The venting system must be installed in accordance with the vent manufacturer’s (Heatfab) installation instructions and guidelines. The installer is urged to visit Heatfab’s website (www.heatfab.com) and review the
installation information for Saf-T Vent EZ-Seal (single-wall) and/or Saf-T Vent CI Plus (double-wall) products.
VENT TERMINATION
The vent system must terminate with a vent terminal approved for this pool heater. Termination may be either
horizontal or vertical. See Table 9 for the Heatfab vent terminals which are approved.
OBTAINING VENT PIPE AND TERMINALS
Hayward offers a variety of double-wall vent components, including terminals, elbows, and straight lengths,
which will satisfy the needs of most applications. The available parts are listed in the service parts section in
the back of this manual. Also, Hayward publishes an instruction sheet which can be used as a guide in specifying installation. It can be obtained on Hayward’s website at www.haywardnet.com. If you need more specialized fittings, you may order them directly from Heatfab, or from an authorized Heatfab dealer. To locate a
dealer for Heatfab venting parts, contact Heatfab at:
Selkirk Corporation
Heatfab Division
130 Industrial Blvd
Turners Falls, MA 01376
(800) 772-0739
www.heatfab.com
Table 8
Maximum Vent Pipe Length and Number of Elbows for
Positive-Pressure Vent Systems
Number of 90degree Elbows

Maximum Vent Pipe
Length
(horizontal & vertical)

50 ft

40 ft

30 ft

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Table 9
Vent Pipe & Terminal Specifications for Positive-Pressure Indoor Vent Kits
Kit Part Number

Heater
Model

Nominal Vent
Pipe Diameter

Vent Type

Single-Wall

UHXPOSHZ11501
UHXPOSHZ12001

H150FD
H200FD

6 inch

Horizontal Vent
Terminal

Vertical Vent
Terminal

Heatfab Saf-T
Vent EZ Seal
P/N 960x *

Heatfab P/N
9614TERM
(elbow terminal)
and
5691CI (wall
penetration)

Heatfab P/N
5600CI

Heatfab SafT Vent CI Plus
P/N CCA06Lxx **

Heatfab P/N
9614TERM
(elbow terminal),
CCK06FC (collar),
CCA06ADSV
(connector ring),
and
CCL06WPNS
(wall penetration)

Heatfab P/N
CCA06RC

Vent Pipe

Double-Wall

UHXPOSHZ12501

UHXPOSHZ13001
UHXPOSHZ13501
UHXPOSHZ14001

H250FD

H300FD
H350FD
H400FD

Single-Wall

Heatfab Saf-T
Vent EZ Seal
P/N 960x *

Heatfab P/N
5690CI

Heatfab P/N
5600CI

Double-Wall

Heatfab SafT Vent CI Plus
P/N CCA06Lxx **

Heatfab P/N
CCE06WP

Heatfab P/N
CCA06RC

Single-Wall

Heatfab Saf-T
Vent EZ Seal
P/N 980x *

Heatfab P/N
5890CI

Heatfab P/N
5800CI

Double-Wall

Heatfab Saf-T
Vent CI Plus
P/N CCA08Lxx **

Heatfab P/N
CCE08WP

Heatfab P/N
CCA08RC

6 inch

8 inch

* For vent pipe section length, “x” should be: 1, 2, 4, 5, or 7, where: 1=6 inches, 2=12 inches, 4=18 inches, 5=24 inches, and 7=36 inches.
** For vent pipe section length, “xx” should be: 06, 09, 12, 18, 24, or 36 indicating the length of the vent pipe section in inches.

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VENT KIT INSTALLATION PROCEDURE
(positive and negative-pressure venting)

1. If connected, turn pump, main gas valve, and heater power off.
2. Locate the heater as close as practical to the gas vent exit.
3. Remove the countersunk phillips-head screws and remove the flue cover panel on top of the heater
and discard. Save the countersunk screws as they will be re-used later.
4. Remove the screws that fasten the heat barrier to the heater. Remove the heat barrier and discard.
See Figure 6.
5. Remove the screws that fasten the rain guard to the heater. Remove the rain guard and discard. See
Figure 6.
6. Install the vent pipe adapter plate included in the kit into the heater using the #10 screws included
with the kit. Ensure the white gaskets are in place under the vent pipe adapter plate before installing. See Figure 7.
7. Install the new flue cover included with the kit over the vent pipe adapter and secure with the countersunk screws from step 3 above. See Figure 8.
8. Remove heater front access door.
9. The vent pressure switches included with the indoor kit are labeled based on heater model and
altitude compatibility. Depending on your model and altitude, select the appropriate vent pressure
switch, and install inside the heater using 2 #10 screws as shown in Figure 9. If your heater is above
2,000 ft elevation, other high-altitude conversion steps may be necessary for proper heater performance. Refer to the information on page 8 and/or the instructions with the FDXLHAK1930 highaltitude kit.
10. Remove the rubber cap from the blower outlet pressure tap and discard. See Figure 10 for blower
tap location.
11. Attach the pressure switch tubing to the vent pressure switch and to the pressure tap on the blower
outlet. See Figure 10 for blower tap location.
12. Connect the jumper wire included with the indoor kit onto one of the terminals on the vent pressure
switch. Unplug the in-line quick connect on the red wire in the heater wire harness, and connect the
vent pressure switch in series with the red wire. See heater wiring schematic on page 28.
13. If installing the kit on models H250FDN, H250FDP, or H400FDP, you must also replace the existing
blower air inlet restrictor with the new one included in the kit.
a. Remove the 4 #10 hex head screws that fasten the 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.
b. Install the new blower plate included in the kit using the 4 screws. It may be helpful to drive
the screws in and out of the plate outside of the heater first to “thread” the holes before installing it in the heater. See Figure 10.
14. Re-install heater front door.
15. Connect vent piping system to heater vent adapter.
16. If connected, turn pump, main gas valve, and heater power back on.
17. Activate heater and check for proper function.

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Vent Adapter

Heat Barrier
Rain Guard

FIGURE 7

FIGURE 6
Flue Cover

FIGURE 8
FIGURE 9
Vent Pressure
Switch

Blower
Air Inlet
Plate

Blower
Pressure
Tap

FIGURE 10

Vent Pressure
Switch Tubing

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REVERSIBLE WATER CONNECTIONS:

This heater is designed so that it can be installed
with the water connections located on either the right
or left side. Heaters are factory-shipped with right-side
water connections. To move the connections to the left
side follow the instructions below. A trained service
technician should perform these steps before the heater
is installed.

Figure 11:
Screw Locations

Figure 14

1. Before beginning, be aware that it is not necessary to remove the water header from the heat exchanger. When this procedure is complete, the water inlet will be located at the BACK of the heater. The
water outlet will be located at the FRONT.
2. Remove screws and remove both of the upper plastic heater side panels (see Figures 11 and 12). Note
the wires that pass through a hole in the heater side panel go through a split-bushing, which will allow
separation of the wires from the panel without disconnecting them.
3. Disconnect the 2 wires connecting the heater wire harness to the heat exchanger header. One is located on the water pressure switch and one is located on the temperature limit switch, both on the top
of the header. Pull these wires into the heater cabinet from the hole in the right-hand metal side panel
in the heater, and re-route them out through the left-hand metal side panel in the heater.
4. Remove countersunk screws on the heater top and remove louvered exhaust panel on heater top (see
Figure 12).
5. Remove the heater top flue cover by removing 3 screws on each side of the heater (see Figure 12).
6. Remove screws and remove rain shield assembly (see Figure 12). Note that there are screws which
hold the rain shield assembly to the heat exchanger tube sheets, which also must be removed.
7. Remove the front access panel (see Figure 12).
8. Disconnect water temperature sensor plug from the ignition control board located inside the heater
(see Figure 12).
9. Pull the water temperature sensor wires out of the heater cabinet through the hole in the right-hand
metal side panel.
10. Lift and rotate the heat exchanger. Do not flip. Use care when setting the heat exchanger in place not
to damage the white sealing gaskets or combustion chamber.
11. Route the water temperature sensor wires into the heater cabinet through the hole in the left-hand
metal side panel, and re-connect to the ignition control board.
12. Re-connect the heater wire harness to the water pressure switch and temperature limit.
13. Reverse the above steps to reassemble the heater.
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21
Figure 12

Top Flue Cover

Louvered
Exhaust Panel
Rain Shield Assembly

Heat Exchanger
Assembly

Pressure
Switch Port

Temperature
Limit Switches
Drain Plug or Valve

Upper Plastic Heater
Side Panel

Ignition Control
Circuit Board

Upper Plastic Heater
Side Panel

Front Access Panel

Figure 2

Page 2 of 2

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22
Gas Supply and Piping :
To properly size the gas piping for the heater, refer to Tables 10, 11, 12, and 13, depending on natural or propane gas, and single-stage or
2-stage regulation. Follow local gas codes for proper gas line material selection (copper, iron, plastic, etc.). It is VERY IMPORTANT when
installing a propane heater on a 2-stage regulation system to follow the gas line sizing data in Table 13 without exception.
Table 10
Natural Gas Pipe Sizing, Low-Pressure, Single-Stage Regulation
Distance from Gas
Meter to Heater Gas
Valve Inlet

Model

H150FDN

H200FDN

H250FDN

H300FDN

H350FDN

H400FDN

btu/hr input

150,000

200,000

250,000

300,000

350,000

400,000

Line Material

Iron or Plastic Pipe

3/4"

1-1/4"

0 to 50 ft
50 to 100 ft

1-1/4"

100 to 200 ft

1-1/4"

1-1/2"

200 to 300 ft

1-1/4"

1-1/2"

Based upon an inlet gas pressure of 0.5 psig or less at a pressure drop of 0.5 in-wc

Table 11
Propane Gas Pipe Sizing, Low-Pressure, Single-Stage Regulation
Distance from
Tank Regulator
Outlet to
Heater Gas
Valve Inlet

Model

H150FDP

H200FDP

H250FDP

H300FDP

H350FDP

H400FDP

btu/hr input

150,000

200,000

250,000

300,000

350,000

400,000

Line
Material

Iron Pipe

Tubing

Iron Pipe

Tubing

Iron Pipe

Tubing

Iron Pipe

Tubing

Iron Pipe

Tubing

Iron Pipe

Tubing

0 to 50 ft

3/4"

7/8"

3/4"

7/8"

1-1/8"

---

50 to 100 ft

3/4"

1-1/8"

---

1-1/4"

---

1-1/4"

---

100 to 200 ft

1-1/8"

---

1-1/4"

---

1-1/4"

---

1-1/4"

---

1-1/4"

---

200 to 300 ft

---

1-1/4"

---

1-1/4"

---

1-1/4"

---

1-1/4"

---

1-1/2"

---

Based upon an inlet gas pressure of 11 in-wc at a pressure drop of 0.5 inch w.c.

Table 12
Natural Gas Pipe Sizing, High-Pressure, 2-Stage Regulation
Distance from Outlet
of 1st Stage Regulator
to Inlet of 2nd Stage
Regulator

First Stage *

Second
Stage **

Model

H150FDN

H200FDN

H250FDN

H300FDN

H350FDN

H400FDN

btu/hr input

150,000

200,000

250,000

300,000

350,000

400,000

Line Material

Iron or Plastic
Pipe

Iron or Plastic

Pipe

0 to 50 ft

1/2"

50 to 100 ft

1/2"

3/4"

100 to 150 ft

1/2"

3/4"

0 to 10 ft

3/4"

* Based upon an inlet gas pressure of 2 psig at a pressure drop of 1 psi
** Based upon an inlet gas pressure of 10 in-wc at a pressure drop of 0.5 in-wc

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Table 13
Propane Gas Pipe Sizing, High-Pressure, 2-Stage Regulation
Distance from
Tank Regulator
Outlet to
Heater Gas
Valve Inlet
First Stage *

Second
Stage **

Model

H150FDP

H200FDP

H250FDP

H300FDP

H350FDP

H400FDP

btu/hr input

150,000

200,000

250,000

300,000

350,000

400,000

Iron

Iron
Pipe

Tubing

Iron
Pipe

Tubing

Iron
Pipe

Tubing

0 to 50 ft

1/2"

Line
Material

Pipe

Tubing

Pipe

Tubing

Pipe

Tubing

50 to 100 ft

1/2"

5/8"

1/2"

5/8"

100 to 150 ft

1/2"

5/8"

1/2"

5/8"

1/2"

5/8"

0 to 10 ft

1/2"

5/8"

1/2"

5/8"

1/2"

3/4"

7/8"

3/4"

7/8"

* Based upon an inlet gas pressure of 10 psig at a pressure drop of 1 psi
** Based upon an inlet gas pressure of 11 in-wc at a pressure drop of 0.5 in-wc

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GAS SUPPLY INSTALLATION:

The heater is shipped from the factory with the gas connection
located on the left-hand side of the heater cabinet. Insert the pipe to
the gas valve through the grommet in the cabinet side (see Figure
14.) A union should be installed outside the heater cabinet for easy
removal of the gas manifold assembly during service.
A CSA certified main gas shutoff valve must be installed outside
the cabinet and within 6 feet of the heater. This valve must have an
I.D. large enough to supply the proper amount of gas
volume to the heater. See Figure 13.
ATTENTION: Apply joint compound (pipe dope)
sparingly and only to the male threads of pipe joints.
Do not apply joint compound to the first two threads.
Use joint compounds resistant to the action of liquefied petroleum gas. Do not overtighten the gas inlet
pipe or damage may result.
ATTENTION : Do not use flexible appliance connectors on any gas connections unless the connector
is CSA approved for outdoor installation, is marked
with BTUH capacity (which must be equal to or
greater than the heater rated input) and the type of gas
(natural or LP).

Figure 13

Figure 14

Gas
Inlet

Supply
voltage
inlet

Bonding
lug
Low
voltage
inlet

Reduction of gas supply pipe or tubing to the inlet of
the heater gas valve must be made at the valve only and must match the valve inlet size (3/4” NPT).
If more than one appliance is installed on the gas line, consult the local gas company for the proper gas
line size.
Questions on the installation of the proper gas line size can be directed to Hayward Technical Service.

NATURAL GAS:

The gas meter must have the capacity to supply enough gas to the pool heater and any other gas appliances if they are on the same pipeline (Example: 225 meter = 225,000 BTUH). If doubt exists as to the meter
size, consult the local gas utility for assistance. Hayward will not be responsible for heaters that soot up due
to improper meter and gas line sizing resulting in improper gas volume.

PROPANE GAS:

All propane gas tanks must be located outdoors and away from pool/spa structure and in accordance with
the standard for storage and handling of propane gas, ANSI/NFPA 58 (latest edition) and applicable local
codes. If the propane gas tank is installed underground, the discharge of the regulator vent must be above the
highest probable water level.
Propane tanks must have sufficient capacity to provide adequate vaporization for the full capacity of the
equipment at the lowest expected temperatures. Consult a propane company expert for correct sizing.

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ATTENTION: Whenever a high-pressure double regulation system is utilized for propane gas, consult
a propane expert for accurate pipe and pressure sizing. Make sure that 1st and 2nd stage regulators are
large enough to handle the BTUH input listed for the heater(s) being used.
Hayward will not be responsible for heaters that soot up due to improper gas line or propane tank sizing
resulting in improper gas volume.

WATER PIPING:

The heater is designed for use with pool and spa/hot tub water only, as furnished by municipal water distribution systems. The warranty does not cover heater use with mineral water, seawater (PPM>4000), or other
non-potable waters.
Do not install any restriction in the water pipe between the heater outlet and the pool/spa with the
exception of:
Figure 15: Pipe nipples
1. three-way switching valve
2. in-line chlorinator
3. chlorinator check valve
WARNING: EXPLOSION
HAZARD Blockage of water
flow from heater return to pool
may result in fire or explosion
causing property damage,
personal injury, or loss of life.
The heater is equipped with CPVC flanged pipe
nipples to accomodate water piping to and from the pool
or spa. These pipe nipples will accept piping by solvent
welding (PVC glue). The fittings will accept either a
2” pipe, or a 2 1/2” pipe fitting, and seal to the heater
header with rubber gaskets. On plastic headers, the fittings are secured in place with plastic union nuts, and on
bronze headers (ASME models), the fittings are secured
in place with bolts. Assemble these parts to the heater
prior to plumbing. Tighten union nuts (or bolts) securely
before gluing fittings to the ends of the pipe nipples. See Figure 15.

Heater
Header

Gaskets

Fittings

Union Nuts

Plastic Header

Heater
Header

Gaskets

Fittings

Bolts

Bronze Header (ASME)

The CPVC flanged pipe nipples must be installed on the heater inlet and outlet without modification.
Pipe, fittings, valves, and any other element of the filter system may be made of plastic materials, if acceptable to the authority having jurisdiction.
Heat sinks, heat tapes, firemen switches, and check valves are not required on the heater. However, if there
is any chance of “back-siphoning” of hot water when the pump stops running, it is suggested that a check valve
be used on the heater inlet pipe.
The built-in bypass inside the header will maintain proper flow through the heat exchanger if the flow rate is
within the range for the heater. See Table 14.
The minimum flow rate is to be calculated or measured with the infloor cleaning system in use, if the pool is
so equipped, as well as any other jets or other demands on the water flow.
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If the normal pump and filter system flow rate exceeds
125 gpm then a manual bypass valve must be installed as
shown in Figure 16. Damage caused by flow rates outside
this range will void the manufacturer’s warranty.
The installation is as follows:
1. Install a flow meter on the outlet line of the heater.
2. Adjust the manual bypass valve until the flow
rate is within the flow rate range specified for the
heater.
3. Once the valve is set, note the position and remove
the valve handle to prevent further adjustment.

Table 14
Allowable Water Flow Rate Range
Minimum Flow Maximum Flow
Model
Rate (GPM)
Rate (GPM)
H150FD
20
125
H200FD
H250FD
25
125
H300FD
H350FD
30
125
H400FD

ATTENTION: Improperly adjusted manual bypass valves will result in damage to the heater if the
flow rates are not maintained as specified in Table 14 under all operating conditions. The heat exchanger will fail and this damage will not be covered under the Hayward warranty.

Figure 16: Manual Bypass valve

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Figure 17 illustrates a typical pool piping diagram and layout for the pool equipment.
Figure 18 illustrates a multiple heater installation for very large pools with and without a manual
bypass valve.
Figure 18: Multiple heater system

Figure 17: Typical plumbing to pool

INSTALLATION ABOVE POOL/SPA SURFACE:

If the heater is installed less than three (3) feet above the surface of the pool/spa water, install eyeball fittings or directional flow
fittings on the end of the return water line to the pool/spa to create
adequate back pressure at the heater to operate the pressure safety
switch when the filter pump is running.
If the heater is installed more than three (3) feet above the surface
of the pool/spa water, install a loop as shown in Figure 19 to prevent
drainage of water in the heater during a filter change.
For installation below the pool/spa surface, refer to Section III.

AUTOMATIC CHLORINATORS AND
CHEMICAL FEEDERS:

Figure 19: Heater installation
above pool/spa

Figure 20: Automatic chlorinator

If used, a chlorinator must be installed downstream from the
heater in the pool return line and at a lower elevation than the heater
as shown in Figure 20. Install a separate positive seal corrosion
resistant check valve between the heater outlet and the chlorinator to
prevent highly concentrated sanitizers from backsiphoning into the
heater. Backsiphoning usually occurs when the pump is shut off and
a pressure differential is created.

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DRAIN VALVE INSTALLATION (ASME MODELS ONLY):

If installing an ASME model heater, a 3/4” brass drain valve must be installed. A suitable drain valve is
included separately with all ASME heaters. Apply a suitable amount of pipe thread sealant or teflon tape to
the threads and install as shown in Figure 21.
Figure 21: Drain valve and
relief valve locations
PRESSURE RELIEF VALVE (ASME MODELS ONLY):
If installing an ASME model heater, a 3/4” pressure-relief valve having a
discharge capacity greater than or equal to the Btu/hr input of the heater, and a
pressure rating equal to or less than the working pressure must be installed. See
the rating plate located inside the front access panel on the heater for the input
rating and working pressure. A suitable pressure relief valve is included separately with all ASME heaters. Apply a suitable amount of pipe thread sealant or
teflon tape to the threads and install as shown in Figure 21. Please note that the
drain valve must be installed before the pressure relief valve. Install the pressure
relief valve with the discharge connection facing the ground. If necessary, conPressure
Drain
nect a pipe (of the same size as the valve outlet) to the outlet and run it to a safe
Relief Valve
Valve
place of discharge. Do not install any shut-off or restriction in this drain line.
Figure 34

PRESSURE RELIEF VALVE (NON-ASME MODELS ONLY):

Some local building codes require a pressure relief valve for non-ASME pool/spa heaters. The plastic header
has a 3/4” port which can be used for this purpose (see Figure 28 for location of port). A 3/4” pressure relief
valve having a discharge capacity greater than or equal to the Btu/hr input of the heater, and a pressure rating
equal to or less than the working pressure is recommended. See the rating plate located inside the front access
panel on the heater for the input rating and working pressure. If desired, you may order the pressure relief valve
from Hayward; order p/n CHXRLV1930. Remove the factory-installed pipe plug, and install the pressure relief
valve using a suitable amount of pipe thread sealant or teflon tape on the threads. Install the pressure relief valve
with the discharge connection facing the ground. If necessary, connect a pipe (of the same size as the valve outlet) to the outlet and run it to a safe place of discharge. Do not install any shut-off or restriction in this drain line.

ELECTRICAL SPECIFICATIONS :
WARNING: It is required that licensed electricians do all electrical wiring. Risk
of Electric Shock. Hazardous voltage can shock, burn, and cause death or serious
property damage. To reduce the risk of electric shock, do NOT use an extension cord
to connect unit to electric supply. Provide a properly located electrical receptacle. All
electrical wiring MUST be in conformance with applicable local and national codes
and regulations. Before working on heater, turn off power supply.

GENERAL INFORMATION :

Wiring connections must be made as shown in the wiring diagram found inside the heater cabinet, and as
shown in Figure 23. The heater must include a definite means of grounding and bonding. There is a ground
lug inside the control box and a bonding lug on the side of the heater.

MAIN POWER :
WARNING - Power connections supplied to the heater must be in accordance with National Electric
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29
Code (NEC) and local electric codes. The NEC contains no standards requiring Ground-Fault Interruption protection (via GFI Circuit Breaker or otherwise) of “Fixed” or “Stationary” equipment, under
article 680: Swimming Pools, Fountains, & Similar Installations.

BONDING :
CAUTION - This heater must be connected to a bonding grid with a solid copper conductor wire
gauge 8 AWG or larger. All Hayward heaters are designed for copper conductors only. The National
Electrical Code (NEC), and most other codes require that all metallic components of a pool structure,
including reinforcing steel, metal fittings and above ground equipment, be bonded together with a solid
copper conductor wire gauge 8 AWG or larger. The heater, along with pumps and other pool equipment
must be connected to this bonding grid. A bonding lug is provided on the side of the heater to ensure
that this requirement is met.

ELECTRICAL CONNECTIONS:

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.
The heater is shipped from the factory wired for use with 240VAC, 60 Hz field power supply. To convert
the heater to 120VAC, 60 Hz operation remove the 240VAC voltage selector jumper from the ignition control board and replace it with the 120VAC jumper. These jumpers are tie-wrapped together and are located
on the fuse board. See Figure 25 for location of the fuse board. All wiring connections to the heater must be
made in accordance with the latest edition of the National Electrical Code ANSI/NFPA 70, unless local code
requirements specify otherwise. In Canada, follow CSA C22.1 Canadian Electrical Code, Part 1.The heater
must be electrically grounded and bonded in accordance with local codes or, in the absence of local codes,
with National Electrical Code, ANSI/NFPA 70. The heater may be installed with the electrical service and
remote control entering the heater cabinet on either the left or right sides of the heater. The heater is equipped
with (4) openings for electrical entry. Any unused openings must be plugged (these are supplied). Field power
wiring connections are to be made to the terminal block located in the upper compartment inside the junction
box (see Figure 22). The heater has 2 junction boxes (one on each side of the heater). Only one junction box
should be used for field power wiring.

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REMOTE CONTROL CONNECTION:
The heater is equipped for con- Figure 29
nection to an external 2-wire remote
thermostat or a 3-wire remote switch. A
2-wire thermostat has its own temperature sensor for regulating water temperature. A 3- wire remote switch allows the
“POOL” or “SPA” models to be remotely selected. Connect remote wiring
to the terminal block located in the lower
compartment inside the junction box (see
Figure 22). The heater has 2 junction
boxes (one on each side of the heater).
Only one junction box should be used for
remote wiring. Do not remove the wires
connected to the remote connection terminal block. Remote wiring must be run
in a separate conduit. Use 22 AWG wire
for runs less than 30 feet. Use 20 AWG
wire for runs over 30 feet. The maximum
allowable run is 200 feet.

Figure 22
L (120v)
or
L1 (240v)

N (120v)
or
L2 (240v)

Ground

Field Power
Wiring Terminal
Block

Remote
Connection
Terminal Block

Spa (RED)

Common
(WHITE)

Pool
(ORANGE)

2-WIRE REMOTE CONTROL CONNECTION:

To configure the heater for 2- wire remote thermostat control, use the “MODE” key on the heater keypad
to put the control into “STANDBY” mode. Then press and hold both the “DOWN” and “MODE” keys for 3
seconds until the display shows the code “bo”.
On the remote control wiring terminal block (Figure 22), connect the appropriate wires from the remote
control to the terminals adjacent to the ORANGE wire (“POOL”) and WHITE wire (“24V”).
To operate the heater by remote thermostat, the heater’s control must be in either “POOL” or “SPA”
mode. The display will show “bo”. The “POOL” or “SPA” LED will be illuminated. The remote thermostat
will operate the heater. The heater’s thermostat will function to limit the water temperature to a maximum of
104°F.

3-WIRE REMOTE CONTROL CONNECTION:

On the remote control wiring terminal block (Figure 22), connect the appropriate wires from the remote
control to the terminals adjacent to the ORANGE wire (“POOL”), WHITE wire (“24V”), and RED wire
(“SPA”). To operate the heater with a remote 3-wire switch, the heater’s control must be in “STANDBY”
mode. The “STANDBY” LED will be illuminated. When the remote switch is set to “Pool/Low” the “POOL”
LED will be illuminated and the water temperature will be displayed. When the remote switch is set to “Spa/
High” the “SPA” LED will be illuminated and the water temperature will be displayed. The heater will use its
internal thermostat to regulate the water temperature to the set point of the mode selected.
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31
Figure 23: Wiring connection diagram.

32
Figure 24:
Lighting &
Operating
Instructions
label

SECTION III. INSTALLER CHECK-OUT AND START-UP:
GENERAL:

Some of the following procedures will require the heater to be operating. Full lighting and shutdown instructions are included on the lighting and operating label affixed to the inside of the front access panel. The heater
automatically lights in response to a call for heat, and automatically shuts down when that call for heat is satisfied.
Water must be flowing through the heater during operation. Check that the pump is operating and the
system is filled with water and purged of all air prior to starting the heater.
Figure 31: Location of Components

Figure 25: Location
of31:
components
Figure
Location of Components
Blower
Vacuum
Switch
Blower
Vacuum
Switch

Keypad
Keypad
Transformer

Fuse Board

Transformer

Fuse Board
Gas Valve

Ignition Control
Board
Ignition Control
Board
Blower

Gas Valve
Sight Glass
Sight Glass
Ignitor
Access Panel
Cover
Ignitor
Gas Manifold
Access
Panel
Cover
Gas Manifold

Blower
Air Box
Air Box

(H150FD and H200FD models)

Flame Sensor

(H150FD and H200FD models)

Flame Sensor

Blower
Vacuum
Switch
Blower
Vacuum
Switch
Transformer

Keypad
Keypad
Ignition Control
Board
Ignition Control
Board
Fuse Board

Transformer
Gas Valve
Gas Valve

Fuse Board
Blower
Flame Sensor
Flame Sensor
Ignitor
Access Panel
Ignitor
Gas Manifold
Access
Panel
Gas Manifold

GAS LINE TESTING:

Blower
Sight Glass
Sight Glass
Air Box

(H250FD, H300FD, H350FD, and H400FD models)

Air Box

(H250FD, H300FD, H350FD, and H400FD models)

The appliance and its gas connection must be leak tested before placing the appliance in operation. The
heater and its individual shutoff valve must be disconnected from the gas supply during any pressure testing
of that system at test pressure in excess of ½ psig (3.45 kPa). The heater must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure testing of the gas supply
piping system at test pressure equal to or less than ½ psig (3.45 kPa).
Gas supply line must be capped when not connected. After pressure testing, reconnect the gas piping to the
gas valve. Turn gas supply “ON” and test all pipe and tubing joints for leaks. Use a soap and water solution.
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If gas pressure is inadequate, check for undersize piping between the gas meter and the heater or for a
low-capacity gas meter. Gas pressure test procedure:
1. Obtain the necessary equipment:
a. Manometer to read pressure in inches of water column
b. 1/8” pipe nipple (1/8” thread x 1” long)
c. 3/16” hex wrench
d. Flat screwdriver
WARNING: EXPLOSIVE
HAZARD.
of an open flame to check for gas
2. Remove the
1/8” plug fromThe
the gasuse
valve.
Install the 1/8”resulting
pipe nipple into
the gas valve.
leaks could cause an3. explosion
in severe
injury and/ or death.
Attach the manometer to the pipe nipple.
Shut off gas and fix4.
even
the
smallest
leak
r
ight
away.
Be sure to leak test the heater
5. Turn on the water system and start the heater following the lighting & operating instructions on the
gas manifold fittings using
the above
once
the isheater
isone
in pool/spa
operation.
label afﬁxed
inside theprocedure
front access panel.
If there
more than
heater connected to the
gas supply line, turn each of those appliances “ON” while testing the heater.
6. Take a pressure reading with the heater running, the value should agree with those in Figure 33. If
the pressure is within the range of 1.8” - 2.0” w.c. (natural) or 6.8” - 7.0” w.c. (propane), then no
further adjustment is needed.
7. If the gas pressure does not meet the above requirements the regulator must be adjusted.
8. are
Gas pressure
regulator
procedure:
The following gas pressure requirements
important
toadjustment
the proper
operation of the burners in
a. Remove the screw cap over the regulator adjustment screw (see Figure 32).
gas heaters. Improper gas pressure or gas b.volume
create
the following
conditions:
Turn thewill
regulator
adjustment
screw clockwise
to increase pressure and counterclockwise to decrease pressure.
1. Flame burns totally yellow.
c. Replace the screw cap over the regulator adjustment screw.

GAS PRESSURE TESTING:

2. Flame lifts off burner.
WARNING
EXPLOSION
HAZARD:
Do not
remove the 1/8” pipe nipple with
3. Heat exchanger soots up. The gas pressure regulator
on all heaters
is preset
at the
factory,
valve inproper
the “ON”operation.
position. The valve must be in the “OFF” position when the
but the setting should be verified by the installer to the
ensure
nipple is removed. Removal of the nipple with the gas valve “on” could cause an

explosion resulting in severe injury and/or death.
If gas pressure is inadequate, check for undersize piping
between the gas meter and the heater or for a
low-capacity gas meter. Gas pressure test procedure:
Figure 26: Gas valve
1. Obtain the necessary equipment:
Regulator
Inlet
a. Manometer to read pressure in inches of
adjustment
pressure
water column
screw under
tap plug
this screw
b. 1/8” pipe nipple (1/8” thread x 1” long)
cap
c. 3/16” hex wrench
d. Flat screwdriver
2. Remove the 1/8” plug from the gas valve.
ON/OFF
DECREASE
INCREASE
PRESSURE
PRESSURE
knob
3. Install the 1/8” pipe nipple into the gas valve.
4. Attach the manometer to the pipe nipple.
Manifold
5. Turn on the water system and start the heater
pressure
Electrical
following the lighting & operating instructap plug
terminals
tions on the label affixed inside the front access
panel. If there is more than one pool/spa heater
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connected to the gas supply line, turn each of those appliances “ON”
while testing the heater.
Pomona, CA Clemmons, NC Nashville, TN
6. Take a pressure reading with the heater running, the value should agree with those
in Table 15.www.haywardpool.com
If the
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pressure is within the range of 1.8” - 2.0” w.c. (natural) or 6.8” - 7.0” w.c. (propane), then no further
adjustment is needed.
7. If the gas pressure does not meet the above requirements the regulator must be adjusted.
8. Gas pressure regulator adjustment procedure:
a. Remove the screw cap over the regulator adjustment screw (see Figure 26).
b. Turn the regulator adjustment screw clockwise to increase pressure and counterclockwise to decrease pressure.
c. Replace the screw cap over the regulator adjustment screw.

WARNING EXPLOSION HAZARD: Do not remove the 1/8” pipe nipple with
the valve in the “ON” position. The valve must be in the “OFF” position when the
nipple is removed. Removal of the nipple with the gas valve “on” could cause an
explosion resulting in severe injury and/or death.

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35
9. Remove the 1/8” pipe nipple and replace the
1/8” pipe plug. If proper pressure cannot be
achieved by adjusting the gas valve regulator, the installer must contact the gas supplier and request that the inlet pressure to
the heater be set to within the gas pressure
range shown in Table 15.

Table 15: Correct gas pressures
Pressure, in. w.c.
FDN
FDP
Fuel
Natural
Propane
Manifold
1.8” - 2.0” w.c. 6.8” - 7.0” w.c.
Inlet, minimum
4.5” w.c.
9.0” w.c.
Inlet, maximum
10.5” w.c.
13.0” w.c.

WARNING EXPLOSION HAZARD: Gas pressures in excess of those listed in
Fig. 33 could cause a gas leak or diaphragm rupture. Gas leakage could cause an
explosion resulting in severe injury or death.

WATER PRESSURE SWITCH TEST / ADJUSTMENT PROCEDURE:

The pressure switch is preset at the factory for most typical, deck level installations. When the heater is located
above or below the level of the pool or spa, the pressure switch may require adjustment to compensate for the change
in static head pressure. The following procedure is recommended when the switch needs adjustment and/or is replaced:
For Installations with Heater Above Water Level:
1. Be sure the filter is clean before making the adjustment.
2. Turn “ON” the filter pump and ensure all air is out of the water lines, and ensure water flow rate is at
least the rated minimum (see Table 14).
3. Turn “ON” the heater and adjust the thermostat to create a call for heat.
4. If the heater does not light, adjust the pressure switch by turning the adjustment knob on the pressure
switch counter-clockwise, until the heater lights. Turning the adjustment knob counterclockwise
decreases the pressure needed to close the switch.
5. Check the function of the pressure switch by turning the filter pump on and off several times. The pool
heater should turn off immediately when the pump is turned off. Never allow the heater to operate with
less than the minimum rated water flow rate.
For Installations with Heater Below Water Level:
1. Be sure the filter is clean before making the adjustment.
2. Turn “ON” the filter pump and ensure all air is out of the water lines, and ensure water flow rate is at
least the rated minimum (see Table 14).
3. Turn “ON” the heater and adjust the thermostat to create a call for heat.
4. Turn the adjustment knob on the pressure switch clockwise, until the heater turns off, then turn the knob
¼ turn counter-clockwise, so that the heater turns back on. Turning the adjustment knob clockwise
increases the pressure needed to close the switch.
5. Check the function of the pressure switch by turning the filter pump on and off several times. The pool
heater should turn off immediately when the pump is turned off. Never allow the heater to operate with
less than the minimum rated water flow rate.

TWO-SPEED PUMP:

In a few cases the pressure from a two-speed pump is below the 1- pound minimum required to operate the water pressure switch on the heater. This is apparent when the pressure switch cannot be further adjusted. In these cases
the pump must be run at high speed to operate the heater. If the pump and piping arrangement are such that the required 1-pound minimum pressure cannot be obtained, do not attempt to operate the heater. Correct the installation.
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TEMPERATURE ADJUSTMENT:

This pool heater is equipped with a digital thermostat which allows the user to select the desired water
temperature. The heater will then function automatically to maintain the desired temperature. The heater has
3 modes of operation:
1. STANDBY: in this mode, the heater will not function to heat the water.
2. SPA: in this mode, the heater will automatically function to maintain the water temperature setting for
SPA mode.
3. POOL: in this mode, the heater will automatically function to maintain the water temperature setting
for POOL mode.
Use the MODE button to change modes. The indicator lights will illuminate to show which mode the
heater is currently in. Each mode has its own temperature setting, allowing the user to have 2 individual
pre-set temperature settings. To adjust the temperature while in SPA or POOL mode, use the UP and DOWN
buttons. The numeric display will flash to indicate the temperature setting is being displayed / adjusted. When
the numeric display is not flashing, the actual water temperature is being displayed. The temperature settings
for both SPA and POOL modes are initially set at the factory to 65°F. The minimum allowed settings for SPA
and POOL modes are both 65°F. The maximum allowed settings for SPA and POOL modes are adjustable up
to 104°F using the temperature lockout feature (see below).
After selecting SPA or POOL mode or adjusting the temperature setting, it is normal for the heater to
delay up to 10 seconds before the heater starts operating. This delay is an internal self-test of the heater. On
occasion, the numeric display may show a diagnostic error code; refer to list of diagnostic error codes in Figure 31. Pressing the MODE button to cycle to STANDBY and back to SPA or POOL will clear a diagnostic
error code. When clearing a diagnostic error code this way, it is normal for the heater to delay up to 5 seconds
before
resuming
normal
operation,
code
re-appear.
diagnostic
error
code this
way, it assuming
is normal the
for diagnostic
the heater error
to delay
updoes
to 5 not
seconds
before
resuming normal operation, assuming the diagnostic error code does not re-appear.
Figure 27: User interface keypad
Numeric Display

Indicator Lights

Buttons

TEMPERATURE LOCK-OUT
The digital thermostat in this pool heater allows the user to lock the maximum temperature
setting allowed. This feature is useful for preventing unauthorized users from manually adjusting
the temperature settings higher than desired. On a new heater, the maximum allowed
ONLY to
HAYWARD
GENUINE
PARTS
temperature lock settings are initially set atUSE
the factory
90°F for POOL
mode, REPLACEMENT
and 104°F for
SPA mode. To adjust these settings, use the following procedure:
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1. Use the MODE button to put the heater in STANDBYTel:
mode.
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2. Press and hold both the UP and DOWN buttons at the same time.
3. After 3 seconds, the thermostat enters maximum temperature lock adjustment mode.
4. The SPA indicator light illuminates and the numeric display shows the current SPA mode

TEMPERATURE LOCK-OUT:

The digital thermostat in this pool heater allows the user to lock the maximum temperature setting allowed.
This feature is useful for preventing unauthorized users from manually adjusting the temperature settings higher
than desired. On a new heater, the maximum allowed temperature lock settings are initially set at the factory to
90°F for POOL mode, and 104°F for SPA mode. To adjust these settings, use the following procedure:
1. Use the MODE button to put the heater in STANDBY mode.
2. Press and hold both the UP and DOWN buttons at the same time.
3. After 3 seconds, the thermostat enters maximum temperature lock adjustment mode.
4. The SPA indicator light illuminates and the numeric display shows the current SPA mode maximum
temperature lock setting. Both the SPA indicator light and the numeric display flashes rapidly when in
adjustment mode.
5. Use the UP and DOWN buttons to set the desired maximum temperature lock setting. When finished,
press the MODE button.
6. The POOL indicator light illuminates and the numeric display shows the current POOL mode
maximum temperature lock setting. Both the POOL indicator light and the numeric display flashes
rapidly when in adjustment mode.
7. Use the UP and DOWN buttons to set the desired maximum temperature lock. When finished, press
the MODE button.
8. The heater will return to STANDBY mode

FAHRENHEIT VERSUS CELSIUS:

The temperature can be displayed in Fahrenheit or Celsius. TO change the display, use the “MODE” button
to place the heater in “STANDBY”. Then press and hold the “UP” and “MODE” buttons until the display shows
the °F/°C selection. Press the “DOWN” button to toggle between selections. To accept the selection, press the
“MODE” button. If the user does not act, the selection will be automatically accepted after 60 seconds.

HEATING MODE:
The control continually compares the water temperature with the set point and the high limit temperature.
When the water temperature is more than 1° below the set point a call for heat is generated and a heating
cycle is initiated.
1. The control checks for open contacts at the blower vacuum switch.
2. The control energizes the blower and the igniter. The igniter heat-up time is approximately 20 seconds.
The blower is running a pre-purge cycle during this time.
3. The control checks for closed contacts at the blower vacuum switch.
4. When the igniter reaches the proper temperature a 4-second trial for ignition begins. The control opens
the gas valve and monitors flame current. The igniter is turned off when flame is sensed or after 4 seconds.
5. The blower vacuum switch, the temperature limit switches, the vent pressure switch, the water pressure
switch, the water temperature sensors, and the flame sensor are constantly monitored during a call for
heat to assure the heater is operating properly.
6. When the thermostat is satisfied and the call for heat ends the control immediately de-energizes the
gas valve. Flame is extinguished.
7. The control operates the blower during a 30-second post-purge period.
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FAILURE TO LIGHT – RETRY:

If the first ignition attempt fails during a normal heating cycle the control will make two (2) additional
ignition attempts:
1. The control de-energizes the gas valve after the 4-second ignition trial ends.
2. The control operates the blower during a 30-second post-purge period.
3. The control monitors for open contacts at the blower vacuum switch.
4. The control performs a gas valve relay check.
5. A normal ignition sequence resumes with Item #2 in “Heating Mode” (above). If the third ignition
trial fails the control enters a safety lockout (or “hard” lockout) after the postpurge period of the
third failed trial.
6. The error code “IF” is displayed and the “SERVICE” indicator is illuminated.
a. The control automatically resets and clears the “IF” error code without any user intervention after
60 minutes. If there is a call for heat after reset the control will make three (3) trials for ignition. If
ignition is not established the control will again enter safety lockout for 60 minutes. This cycle will
continue until ignition is established or the call for heat is removed.
b. The user can reset the control and clear the “IF” error code by pressing the “MODE” button to
move through “STANDBY” and return to the previous mode (“SPA” or “POOL”).

LOSS OF FLAME – RECYCLE:

If flame is established and then lost, the control will make ten (10) attempts at ignition. If flame is lost
within ten (10) seconds of ignition the control will respond within 2 seconds. If flame is lost more than ten (10)
seconds after ignition the control will respond within 0.8 seconds.
1. The control de-energizes the gas valve and the blower.
2. The control monitors for open contacts at the blower vacuum switch.
3. The control performs a gas valve relay check.
4. A normal ignition sequence resumes with Item #2 in “Heating Mode” (above).
5. If the tenth ignition trial fails the control enters a safety lockout (or “hard” lockout) after the postpurge period of the tenth failed trial.
6. The error code “IF” is displayed and the “SERVICE” indicator is illuminated.
a. The control automatically resets after 60 minutes. If there is a call for heat after reset the control
will make three (3) trials for ignition. If ignition is not established the control will again enter safety
lockout for 60 minutes. If flame is established but is lost the control will make ten (10) attempts at
ignition. This cycle will continue until ignition is established or the call for heat is removed.
b. The user can reset the control and clear the “IF” error code by pressing the “MODE” button to move
through “STANDBY” and return to the previous mode (“SPA” or “POOL”).

KEYPAD INPUTS:

The control accepts user inputs via the keypad on the front panel.
1. When changing the mode from “STANDBY” to either “SPA” or “POOL” there may be up to a 10second delay for the blower fan to begin running. The control performs an internal self-test and then
verifies that the blower vacuum switch contacts are open before energizing the blower.
2. It is normal for the heater to display a 1- to 2-second delay in responding to any keypad input.
3. It is normal for the heater to display up to a 5-second delay when the keypad is used to reset the control
to clear an error code.
4. The control will accept a mode change during lockout after 5 seconds. The control will continue to
display the error code and remain in lockout until it is reset. At reset the control will go to the last saved
mode.
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AUTOMATIC RESET TIME:

The heater will automatically reset when an error condition is corrected and resume operation as detailed
in the table below. The heater can be manually reset using the keypad by cycling the mode button through
“STANDBY” and back to the original operating mode (“SPA” or “POOL”).

PERIODIC INSPECTION:

The heater is designed and built for long performance life when installed and operated according to the
manufacturer’s directions. Regular inspection by qualified service personnel is recommended to keep the
heater working properly. The following inspection points are suggested to help maximize heater life.
1. Periodically check the venting on outdoor heaters. The heater’s venting areas (the louvered top panel)
must never be obstructed in any way and minimum clearances must be observed to prevent restriction of combustion and ventilation air. Remember that shrubs grow and in time may obstruct a heater’s
venting areas.
2. Check the venting of indoor heaters for looseness and possible leaks. Keep all openings for combustion
and ventilation air clear and unobstructed.
3. Keep the entire pool heater area clean and free of all debris, combustible materials, gasoline, and other
flammable vapors and liquids. Remove any leaves or paper from around the heater.
4. Do not store chlorine, other pool chemicals, or other corrosives in the vicinity of the heater.
5. If the heater is operating on propane gas, the tank must not fall below 30% full or damage to the heater
may occur. Hayward will not be responsible for heaters that soot up due to improper gas level in the
tank resulting in inadequate gas volume.
6. If another appliance is added to the gas line at a later date, consult the local gas company to be sure the
gas line will have the capacity to supply both units at full input rating at the same time.
7. Do not use the heater if any part has been under water. Contact a qualified service technician to inspect
the entire heater and replace any part of the control system or gas valve that was under water. If heater
has been totally submerged in water it must be removed and the entire heater must be replaced.
8. An inspection program is a good preventative maintenance measure. Keep this manual in a safe place
for future reference for yourself as well as for a service technician to consult when inspecting or servicing the heater. Additional inspection procedures to be performed by a qualified service technician are
covered in Section VI of this manual.

WINTERIZATION:

In moderate climates, the heater can continue to operate during short-term cold spells. Do not use the
heater to maintain the water temperature just above freezing or for freeze protection. Care must be taken to
avoid freeze-up in the heater. When it is used during freezing weather, the pump must run continuously. The
heater is not warranted against freeze-ups. In regions where freezing temperatures are encountered, all water
must be drained from the heater when it is out of service, to prevent damage to the heater and piping. Draining the heat exchanger is recommended as part of the season’s shutdown procedures.
ATTENTION: A heater damaged by freezing is not covered under the Hayward warranty.

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DRAINING THE HEAT EXCHANGER:

This procedure applies to installations where the heater is located higher than the pool water level. If it
is necessary to drain a pool heater located below the pool water level, you must either partially drain the
pool, or isolate the pool heater from the pool using valves.
1. Set the heater to STANDBY mode using the keypad.
2. Turn the electricity to the heater OFF at the circuit breaker panel.
3. Turn the heater gas valve OFF using the knob on the valve (see Figure 26).
4. Turn the heater’s gas supply OFF at the main shut-off valve outside the heater cabinet.
5. Be sure the circulating pump is OFF.
6. On models with plastic headers, remove the plastic drain plug (see Figure 28). On models with
bronze headers (ASME models), open the brass drain valve located on the header (see Figure 21).
7. Allow all water to drain from the heater.
8. On models with plastic headers, re-install the plastic drain plug. On models with bronze headers
(ASME models), close the brass drain valve located on the header.

SPRING START-UP:

1. Inspect and clean the heater, being sure the heater is free of leaves and debris prior to startup.
2. Be sure inlet and outlet piping are properly attached to the heater and the drain valve is closed.
3. Turn the filtration system pump “ON” and allow the system to run long enough to purge all the air
from the lines.
4. Turn the gas supply to the heater “ON”.
5. Set the temperature control using the keypad to “POOL” or “SPA” and adjust the set point to the
desired temperature setting.
6. If operating difficulties are encountered, contact a qualified service company for assistance.
ATTENTION: Heater installation, checkout, and start-up should now be completed. BE SURE to
leave the Owner’s Manual with the pool owner.

Figure 28: Heat exchanger header components
Water Pressure
Switch

Bypass Service
Cartridge

Inlet/Outlet
Header

Cartridge
Retaining Nut

Temperature
Limits

Thermistor
Pressure Relief
Valve Port

Drain Plug

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SECTION IV. QUALIFIED TECHNICIAN – MAINTENANCE & SERVICING

GENERAL:
ATTENTION: Only qualified service technicians, with appropriate test equipment, should be allowed
to service the heater. Bear in mind that all of the components that comprise the system have an effect
on heater operation. Before proceeding with heater related troubleshooting tips covered in Section VII,
be certain that the pump is operating correctly, the filters and strainers are not blocked, the valves in the
piping are properly positioned, and the time clocks are properly set.
WARNING: EXPLOSION HAZARD Do not attempt to repair any components of
this heater. Do not modify the heater in any manner. To do so may result in a malfunction that could result in death, personal injury, or property damage. Check with
the consumer to see if any part of the heater has been under water. Replace any part
of the control system and any gas control that has been under water.

MAINTENANCE:

The following inspection procedures are recommended to be performed as part of annual heater maintenance and to ensure safe operation.
1. External heat exchanger
2. Internal heat exchanger
3. Main burner flame patterns
4. Main burner orifices
5. Operating controls

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EXTERNAL HEAT EXCHANGER INSPECTION AND CLEANING:

Remove the louvered exhaust cover panel (see Figure 12) and inspect the external surfaces of the heat exchanger for soot accumulation. If soot has accumulated, it must be removed by following the recommended procedure:
1. Turn pump, main gas valve, and heater power “OFF”.
2. Remove heat exchanger according to the procedure in Section II, under “Reversible Water Connections”.
WARNING: BURN HAZARD Do not use a wire brush to remove soot from the
heat exchanger. This could cause a spark and ignite the gases trapped within the soot.
3. Using a soft-tipped brush such as a paint brush, apply a degreaser to the entire heat exchanger surface (top and bottom). Allow the heat exchanger to sit for a period of time to
allow the degreaser to loosen the soot. Wash the heat exchanger using a garden hose ensuring
both the top and bottom surfaces are cleaned. Re-assemble the heater by reversing the disassembly steps.
Although the heat exchanger should be cleaned of soot and reinstalled, the fact that sooting occurred
should be investigated, as it may indicate other problems such as:
• Insufficient air supply
• Inadequate venting
• High or low gas pressure
• Blockage of burner tubes or orifices
• Blockage of blower inlet
• Low voltage supply causing blower to “spin” slower
• Improper heater location installation
• Incorrect gas supply pipe size
• Excessive water flow through heat exchanger
• LP tank below 30% full

COMBUSTION CHAMBER:

The combustion chamber is a single-piece casting. If damaged, the entire chamber must be replaced.

HEAT EXCHANGER REMOVAL:

Follow steps in Section II, under “Reversible Water Connections” for heat exchanger removal procedure.

BURNER INSPECTION AND CLEANING:
With the heater “ON”, remove the front
access panel and make a visual inspection of
the main burners through the sight glass (see
Figure 25.) The main burner flames should be
about ½” to 2” in height and should not “lift”
off the burner ports (see Figure 29).
A normal flame is blue, without yellow
tips. Yellow tips or a totally yellow or “lazy”
flame may be an indication of a fuel-rich mixture due to restricted air supply. Spider nests in
the burner and/or gas orifices may also cause
yellow tips.

Figure 29: Burner Flame characteristics

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BURNER REMOVAL AND REPLACEMENT:

Refer to Figures 12, 25, and 26 as needed.
1. Turn pump, gas supply, and heater power “OFF”.
2. Turn gas valve knob “OFF”.
3. Remove the front access panel. It is secured
with (4) screws.
4. Disconnect the union joint in the gas supply piping outside the heater cabinet.
5. Disconnect the wiring terminals from the gas valve.
6. Disconnect the wiring terminals from the blower.
7. Remove the gas manifold assembly. It is attached
to the air box using (4) screws.
8. Remove the screws from the igniter access panel and pull it out of the way.
Do not disconnect the wires.
9. Remove the air box cover. Do not remove the blower from the air box cover.
10. Remove the (2) screws securing each burner to the combustion chamber front.
11. Pull the burners straight out of the heater.
12. Reverse the above procedure to install the burners.
13. Turn the gas supply “on”. Use a soapy water solution to check for leaks.
Bubbles forming indicate a leak.
WARNING: EXPLOSION HAZARD The use of an open flame to check for gas
leaks could cause an explosion resulting in severe injury and/or death

GAS VALVE REPLACEMENT:
Refer to Figures 12 and 25 as needed.

ATTENTION: Do not attempt to repair the gas valve. If found defective, replace the entire valve.
Attempts to repair it will void the warranty.
1. Turn pump, gas supply, and heater power “OFF”.
2. Disconnect the union joint in the gas supply piping outside the heater cabinet.
3. Remove the front access panel. It is secured with (4) screws.
4. Disconnect the wiring terminals from the gas valve.
5. Remove the gas manifold assembly. It is attached to the air box using (4) screws.
6. Unscrew the gas valve from the gas manifold pipe.
7. Reassemble the gas manifold assembly using the new gas valve. Only use liquid pipe thread sealant
on the male threads of the gas manifold pipe. Do not place pipe dope on the first two threads of any
joint.
8. Reverse the above procedure to re-install the gas manifold.
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IGNITER:

Refer to Figures 12 and 25 as needed. To remove the igniter:
1. Turn pump, gas supply, and heater power “OFF”.
2. Remove the front access panel. It is secured with (4) screws.
3. Disconnect the igniter wires from the ignition control board.
4. Remove the screws from the igniter access panel. Working from the underside of the panel, press the
bushing out of the hole in the sheet metal panel.
5. Slide the igniter wires through the slot on the panel and pull the panel free.
6. Remove the (2) screws that secure the igniter.
7. Pull the igniter straight back until it is free of the combustion chamber, then out of the air box.
8. Reverse the above procedure to install the igniter.

FLAME SENSOR:

Refer to Figures 12 and 25 as needed. To remove the flame sensor:
1. Turn pump, gas supply, and heater power “OFF”.
2. Remove the front access panel (4 screws).
3. Disconnect the wire from the flame sensor.
4. Remove the screws that secure the flame sensor to remove the sensor.
5. Reverse the above procedure to install the flame sensor.

BURNER ORIFICES:

Refer to Figures 12 and 25 as needed. To remove the burner orifices:
1. Turn pump, gas supply, and heater power “OFF”.
2. Disconnect the union joint in the gas supply piping outside the heater cabinet.
3. Remove the front access panel. It is secured with (4) screws.
4. Disconnect the wiring terminals from the gas valve.
5. Remove the gas manifold assembly. It is attached to the air box using (4) screws.
6. Remove the orifices using a 7/16” wrench.
7. After cleaning or replacing orifices re-install into the gas manifold pipe being careful not to crossthread or over tighten as a leak may result.
ATTENTION: Do not enlarge orifice holes.

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GAS CONVERSION:

The factory-installed gas train, where appropriate, may be changed from natural gas to propane or from
propane to natural gas, using the appropriate conversion kits available from the factory. Gas conversions are
to be performed only by a qualified service agency. Detailed instructions are included with each kit.
ATTENTION: Conversion kits are not available in Canada. Conversions must be performed by the
conversion station at Hayward Pool Products Canada, Inc.

ELECTRICAL WIRING:
ATTENTION: If it is necessary to replace any of the original wiring, it must be replaced with
Hayward supplied replacement parts.

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IGNITION CONTROL SYSTEM:

The ignition control system in this heater consists of 3 printed circuit boards (the ignition control board,
the display board, and the fuse board) and a keypad. The locations of these components are shown in Figure
31. The ignition control system functions as the heater’s thermostat, safety control system, and controller for
the gas combustion system.
To remove/replace the ignition control board or the fuse board:
1. Turn pump, gas supply, and heater power OFF.
2. Remove the front access panel.
3. Disconnect all wires from the printed circuit board.
4. Detach the board from the sheet metal panel by compressing the plastic stand-offs.
5. Replace the board, and reverse the above steps to reassemble.
To remove/replace the display board or keypad:
1. Turn pump, gas supply, and heater power OFF.
2. Remove the front access panel.
3. Unplug the display board ribbon cable from the ignition control board.
4. Remove the 4 screws and remove the plastic bezel & keypad assembly from the sheet metal panel on
the front of the heater.
5. The display board is attached to the back side of the bezel & keypad assembly. Unplug the keypad
ribbon cable from the display board.
6. Detach the board from the plastic bezel by removing the 2 small screws.
7. Replace the display board or bezel & keypad assembly, and reverse the above steps to reassemble.

BLOWER VACUUM SWITCH:

The blower vacuum switch is a safety device that prevents the ignition sequence from continuing unless
the blower is developing sufficient airflow for combustion. Figure 31 shows the location of the blower vacuum switch in the heater cabinet. When the blower achieves sufficient airflow, the negative pressure created in
the blower housing closes the contacts on the blower vacuum switch, indicating to the ignition control board
that it is safe to continue the ignition sequence. A silicone tube connects the blower vacuum switch with the
blower as shown in Figure 31.
To remove the blower vacuum switch:
1. Turn pump, gas supply, and heater power “OFF”.
2. Remove the front access panel. It is secured with (4) screws
3. Remove the wires from the pressure switch.
4. Pull the tubing from the hose barb on the switch.
5. Remove the (2) screws that secure the pressure switch to the control panel.
6. Reverse the above procedure to install the blower vacuum switch.

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HIGH LIMIT SWITCHES:

The high limit is an automatically resetting safety device wired in series with the thermostat and gas
valve. See Figure 28. The heater is equipped with two automatic high limits, located on the water header.
If the water temperature exceeds the limit set point, the gas valve will be closed, shutting off gas supply to
the burners.
Erratic high limit operation is often an indication of a problem with water flow. Reduced flow may be caused by:
1. Clogged filter or strainer.
2. Excessive flow through the external bypass if one is used.
3. Lime scale accumulation in the heat exchanger.

TO REPLACE A HIGH LIMIT SWITCH:
1.
2.
3.
4.
5.

Turn pump, gas supply, and heater power “OFF”.
Drain the heat exchanger of all water.
Unplug the high limit wires from the wiring harness.
Unscrew the high limit switch from the header.
Replace the high limit switch. Use new sealant on the high limit switch threads before reinstalling.
Reverse the above procedure to install the high limit switch.

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THERMISTOR:

The thermistor monitors the return water temperature. See Figure 28. To replace the thermistor:
1. Turn pump, gas supply, and heater power “OFF”.
2. Drain the heat exchanger of all water.
3. Remove the front access panel. It is secured with (4) screws
4. Unplug the thermistor connector from the ignition control board.
5. From outside the heater, pull the thermistor leads out of the control box and through the hole in the
heater chassis.
6. Unscrew the thermistor from the inlet side of the header.
7. Replace the thermistor. Use new sealant on the thermistor threads before re-installing. Reverse steps
above to complete the procedure.

WATER PRESSURE SWITCH:

The water pressure switch (Figure 28) is preset at the factory for most typical, deck level installations.
When the heater is located above or below the level of the pool or spa, the pressure switch may require
adjustment to compensate for the change in static head pressure. If adjustment is needed, the procedure is
detailed in Section III, under Water Pressure Switch Test / Adjustment Procedure.
ATTENTION: Do not operate the pool heater without the function of a properly adjusted pressure
switch or flow switch.
To replace the pressure switch:
1. Turn pump, gas supply, and heater power “OFF”.
2. Unplug the high limit terminals from the main wire harness.
3. Remove the (4) screws securing metal trim panel around the header.
4. Remove the wires from the pressure switch.
5. Using two ½” open-end wrenches disconnect the pressure switch from the pressure switch tubing.
6. Replace the pressure switch. Use new sealant on the pressure switch threads before re-installing.
7. Reverse steps above to complete the procedure.

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TRANSFORMER:

The transformer converts the field supply voltage (either 240 VAC or 120 VAC) to a 120 VAC output for
blower and igniter power, and a 24 VAC output for powering the ignition control board, control circuits, and
gas valve. See Figure 25 for its location. To replace the transformer:
1. Turn pump, gas supply, and heater power “OFF”.
2. Remove the front access panel. It is secured with (4) screws.
3. Disconnect all wires from the transformer leads.
4. Remove the (2) screws that secure the transformer to the control box.
5. Replace the transformer. Reassembly is the reversal of steps above.

BLOWER:

The blower provides the air that mixes with the gas at the main burners for the combustion process. The
blower operates during the pre-purge time (approximately 30 seconds) at the beginning of each ignition cycle,
during the entire time the gas valve is open and the burners are firing, and for 30 seconds after the valve gas
closes. See Figures 25 and 30.
To replace the blower:
Figure 30: Blower
1. Turn pump, gas supply, and heater power “OFF”. Figure 30: Blower
Blower
2. Remove the front access panel (4 screws).
3. Disconnect the blower wire harness from the ignition
Blower Air Inlet Plate
control board.
4. Disconnect the tubing from the hose barb on the blower
housing.
5. Remove the blower air inlet plate from the blower (4 screws).
6. Remove the blower from the air box cover (4 screws).
7. Reverse the above steps to reassemble the blower.
Be sure the blower outlet gasket is in place before proceeding.
Blower Outlet Gasket

Air Box Cover

BYPASS SERVICE CARTRIDGE:

The following procedure details how to remove and replace the internal pressure bypass valve in the
header. This procedure applies only to plastic (non-ASME) headers. On bronze (ASME) headers, the bypass
service cartridge is not field-replacable. Please contact Hayward technical support for more information.
1. Turn pump, main gas valve, and heater power off.
2. Drain heat exchanger according to instructions in Section III of this manual.
3. Remove 6 screws and remove the upper plastic heater side panel, to allow access to the header.
4. Remove the cartridge retaining nut from end of header (see Figure 28).
5. Slide out the bypass cartridge from the end of the header (see Figure 28).
6. Check the function of the bypass valve to ensure the valve flaps rotate smoothly on the shaft, and the
spring fully closes the valve.
7. Apply silicone o-ring grease (Hayward Jack’s 327 Multilube p/n SP032712, or equivalent) on o-ring seals
on the bypass cartridge before inserting into the header.
8. Insert bypass cartridge into header with the arrow on the end of the cartridge pointing up.
9. Re-install cartridge retaining nut. Nut should be tightened hand-tight only. DO NOT OVER-TIGHTEN.
10. Re-install the upper plastic heater side panel.
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SECTION V. TROUBLESHOOTING

GENERAL:
ATTENTION: These instructions are intended for the use of qualified personnel trained and experienced in the installation and servicing of this type of heating equipment and its related system components. Some states may require installation and service personnel to be licensed. Persons not qualified
should not attempt to repair this equipment according to these instructions. These instructions and
procedures are not or the use of “do-it-yourself” consumers.
WARNING: BURN HAZARD The operation of the heater with the pump shut off
could cause heater overheating and fire. Never operate heater with the pump shut off.
ATTENTION: As a preliminary check, make sure that all wire connections are
clean and tight and that all wiring conforms to the wiring diagram.

AUTOMATIC RESET TIME:

The heater will automatically reset when an error condition is corrected and resume operation. The heater
can be manually reset using the keypad by cycling the MODE button through “STANDBY” and back to the
original operating mode (“POOL” or “SPA”).

ERROR CODES:

See Figure 31 for an error code chart.

TROUBLESHOOTING:

See Figure 32 for troubleshooting guide.

SUPPLY WIRING:

If the heater is connected to the line side of the circuit it will be powered at all times. In this situation,
when the pump shuts down the heater will display a fault code of “LO”. If there is a call for heat and the
pump then restarts there will be a 2-minute delay for the heater to fire. After the pump has been running for at
least 2 minutes there is no delay for heater operation.
Wiring the heater to the load side of the timer or controller will not result in a 2-minute delay if the pump
primes quickly enough to activate the heater’s water pressure switch. If the pump is slow to prime the heater
may display an “LO” fault code and will take 2 minutes to automatically restart. If the pump has primed, this
wait can be avoided by manually clearing the error code via the keypad by changing the mode through the
“STANDBY” setting and returning to the initial setting (“SPA” or “POOL”).
When a heater is wired to the line side of the power circuit (continuous power) the blower will not operate when the pump is cycled via a time clock or other switch method.

USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
www.haywardpool.com

INTERNAL WIRING:

If the heater display is blank after the electrical has been installed see Figures 43 and 44 to determine the
cause. The ribbon cable between the display board and the ignition control board is polarized and cannot be
inserted upside down if it was removed when electrical was done.

FUSE SPECIFICATIONS:

The fuse designations are printed on the ignition board and the control board. See Figure 25 for board locations. Fuses are available as common hardware items or may be purchased from Hayward in a service parts
kit. The fuse specifications are:
• F1 fuse (low voltage): 3A blade style fast-acting automotive fuse, type 257
• FC1 & FC2 (transformer primary) and FC4 (transformer secondary):
3A slo-blo fuse, 5 x 20 mm

USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
www.haywardpool.com

Figure 31: ERROR CODES

Code

Description

Information

Internal fault/power-up
error

On initial trial for ignition. Automatic reset is immediate once the gas valve relay
check results are acceptable.

Gas valve sensed
as “ON” error

If valve is open when it should be closed the heater will shut down and go into
lockout. Blower will operate until error condition is corrected. Automatic restart
2 minutes after error is corrected.

Gas valve sensed
as “OFF” error

If valve is closed but flame is sensed the blower will run for 5 s then start a new
ignition sequence. If error occurs 10 times during a call for heat the control will
go into lockout. Automatic reset is 60 minutes.

Data retrieval error

If control input data is corrupted the heater will shut down and go into lockout.

Flame present with gas
valve “OFF” error

If flame is sensed with the gas valve off the control will go into lockout. The
blower will run until error condition is corrected. When corrected, control will
run blower for 5 s then automatically restart after 2 minutes.

Electrical supply wiring
error

This code will display if 120V polarity is reversed, low voltage is detected, or if
the ground path is not sufficient. Reset is immediate after error is corrected.

Blower vacuum switch
open error

If the blower prover switch does not close after the blower starts the control will
stop the ignition trial go into lockout. The blower will continue to run. Automatic
reset is immediate after the switch closes.

Blower vacuum switch
open when expected
closed error

If the blower prover switch opens unexpectedly during operation the control will
shut down and attempt to re-light. If the switch does not close after the blower
starts the control will go into lockout with the blower running. Automatic reset is
immediate after error is corrected.

Blower vacuum switch
open during post-purge
error

If the blower prover switch opens during the postpurge cycle (heater is not firing) the control will display the error code. The post-purge cycle will be completed once the blower prover switch closes.

Blower vacuum switch
closed when expected
open error

If the blower prover switch is closed before blower start-up the control will not
start the blower. Automatic reset is immediate when the switch opens.

Igniter open error

If the control is not in lockout and senses that the igniter circuit is open when the
blower is running the control will turn off the blower and go into lockout. Automatic restart 2 min after error is corrected.

Thermistor error

An excessive temperature difference between the two thermistors (5 °F or more)
or an “out of bounds” condition on both sensors (less than 10°F or greater than
180°F) will result in the error code. Automatic restart is 2 minutes after the error
is corrected.

USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
www.haywardpool.com

Figure 31: ERROR CODES (continued)
Code

Description

Information

Water Temperature
Sensing Error

A) Inlet water temperature sensor is reporting a temperature in excess of 104°F.
Normal operation resumes 2 minutes after inlet water temperature sensor reports
temperatures of 104°F or less. This error functions in both normal and remote
thermostat modes.
or

B) Inlet water temperature sensor is reporting a temperature change at a rate
faster than 6°F in 60 seconds, indicating a potentially damaging low water flow
conditon. Normal operation resumes when temperatures stabilize. If this condition is detected 3 times, the heater will lock-out until the electrical power is
cycled off and back on.
Sb

Keypad button stuck
closed error

If one of the keypad buttons is closed (or pressed) for more than 30 s the error
code will be displayed but the control will continue to function. The error code
will be cleared when the condition is corrected.

Ignition failure error

If the control exceeds the maximum number of ignition retries or recycles the
heater will shut down and go into lockout. Automatic reset is 60 minutes.

Communication error

If communication between the ignition board and the display board is not established within 3 s of power-up an error will be displayed. After communication is
established, if it is lost for 30 s, the error will be displayed. The error code will
be cleared upon a valid data exchange between boards.

Limit string open error

If the limit string opens the heater shuts down and goes into lockout. Automatic
restart is 2 minutes after the error condition is corrected and the limit string
closes. See below for more detail.

EEPROM ERROR

An error was detected in the ignition control circuit board.

USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
www.haywardpool.com

Figure 32: TROUBLESHOOTING

Code

Fault

Diagnosis Step

Remedy

Heater will not
power up.

1. Check for Low & High
Voltage Output from Fuse
Board

Disconnect plug from P5 connector from Fuse Board. Measure
for 24VAC between pins of receptacle on Fuse Board. Reconnect
plug. Disconnect plug from P6 of Fuse Board. Measure for 120VAC
between pin 3 and 5 of receptacle on Fuse Board. Reconnect plug. If
OK, proceed to section titled ‘‘Low voltage circuit fault’’. Otherwise,
proceed to step 2.

2. Ensure field power supply Measure for field supply voltage across terminals of TB1 terminal block
to heater is turned on.
on Fuse Board. If OK, proceed to step 3

None

Low voltage
circuit fault.

None

3. Check for faulty Fuse
Board wiring.

Insoect Fuse Board wiring. Ensure all plugs are securely fastened to
Fuse Board. If OK, proceed to step 4.

4. Verify that FC1 and FC2
Fuses on Fuse Board are not
open.

Remove FC1 and FC2 fuses from fuseholder. Measure continuity
across fuse. If fuses are open, proceed to section titled ‘‘Open FC1 and/
or FC2 Fuses’’. If fuses are OK, reinstall them and proceed to step 5.

5. Verify that 240vac Voltage
Selector Plug is not installed
with a 120vac field power
supply
6. Check for defective
Transformer.

Check that proper Volatage Selector Plug is installed in Fuse Board. If
OK, proceed to step 6

7. Fuse Board is defective

Replace Fuse Board.

1. Check for Low Voltage
Output from Fuse Board

Diconnect plug from P5 connector from Fuse Board. Measure for
24VAC across pins. Reconnect plug. If OK, proceed to step 2.
Otherwise, proceed to step 5.

2. Check for faulty Control
Module wiring.

Inspect Control Module wiring. Ensure all plugs are securly fastened to
Control Module. If OK, proceed to step 3.

3. Verify low voltage input
to Control Module.

Verify 24VAC across R and C terminals on Control Module. If not OK,
replace harness. If OK, procced to step 4.

4. Verify that F1 Fuse on
Control Board is not open.

Remove F1 fuse from fuseholder. Measure continuity across fuse. If
OK, replace Control Module. If fuse is open, proceed to section titled
‘‘Open FC3 or FC1 Fuses’’.

5. Verify that FC3 on Fuse
Board is not open

Remove FC3 fuse from fuseholder. Measure continuity across fuse. If
fuse is open, proceed to section titled ‘‘Open FC3 or FC1 Fuses’’. If
OK, reinstall fuse and proceed to step 6.

6. Check for defective
Transformer.

Disconnect plug from P4 connector from Fuse Board. Mesure for
24VAC between pins 1 & 2 of plug from transformer. If 24VAC is not
present, replace Transformer. Otherwise, proceed to step 7.

7. Fuse Board is defective

Replace Fuse Board

Open FC1 and/or 1. Verify that 120VAC
FC2 Fuses.
Voltage Selector Plug is not
installed with a 240VAC
field power supply.
None

Disconnect plug from P4 connector from Fuse Board. Mesure for
24VAC between pins 1 & 2 of plug of Transformer and 120VAC
between pins 4 & 6. If 24VAC or 120VAC is not present, replace
Transformer. Otherwise, proceed to step 7.

Check that proper Voltage Selector Plug is installed. If OK, proceed to
step 2.
If 120VAC plug is installed and field supply voltage is 240VAC, FC1
and FC2 fuses will have to be opened. Install the correct Voltage
Selector Plug and new FC1 and FC2 fuses.

2. Check for faulty
Transformer wiring.

Inspect Transformer wiring. Ensure insulation on wiring is not worn. If
OK, proceed to step 3.

3. Defective Transformer

Replace Transformer.

Figure 32: TROUBLESHOOTING
Code

Fault

Diagnosis Step

Open FC3 and/or 1. Check for faulty Gas
F1 Fuses
Valve wiring.

None

Open FC4 Fuse.

None

Bad Board or
Secondary Hig
Voltage Fault

Remedy
Inspect Gas Valve wiring. Ensure insulation on wiring is not worn. If
OK, proceed to step 2.

2. Verify that Gas Valve is
not defective.

Mesure for resistance across Gas Valve terminals and between each
terminal and ground. If short exists, replace Gas Valve. If OK, proceed
to step 3.

3. Check for faulty Control
Module wiring.

Inspect Control Module wiring. Ensure insulation on wiring is not worn.
If OK proceed to step 4.

4. Control Module is
defective.

Replace Control Module.

1. Check for faulty Igniter
wiring.

Inspect Igniter wiring. Ensure insulation on wiring is not worn. If OK,
proceed to step 2.

2. Check for faulty Blower
wiring.

Inspect Blower wiring. Ensure insulation on wiring is not worn. If OK,
proceed to step 3.

3. Check for defective
Igniter.

Disconnect Igniter plug from Control Module. Measure resistance
across Igniter. Resistance should be 10.9-19.7 ohms at at 77°F. If out of
this range, replace igniter. If OK, proceed to step 4

4. Check for defective
Blower.

Disconnect Blower plug from Control Module. Measure resistance
across Blower windings. Winding resistance across lead should be in
the following range: Red-to-White: 8 to 9 ohms. If measured values
vary substantially from these values, blower is defective. Replace.
Otherwise proceed to step 5.

5. Control Module is
defective.

Replace Control Module.

1. Verify that FC4 Fuse on
Fuse Board is not open.

Remove FC from fuseholder. Mesure continuity across fuse. If OK,
reinstall fuse and proceed to step 2. If Fuse is open, proceed to section
titled ‘‘Open FC4 Fuse’’.

2. Verify high voltage output Disconnect plug from P6 connector of Fuse Board. Measure for
from Fuse Board.
120VAC across pins 3 and 5 of P6 receptacle on Fuse Board. If OK,
reconnect plug and proceed to step 3. If not OK, go to step 4.

3. Check for defective
Harness.

Disconnect plug from E10 connector of Contol Module. Measure for
120VAC across pins 1 and 3 of Plug on Harness. If OK, replace Control
Module. If not OK, replace Harness.

4. Check for defective
Transformer.

Disconnect plug from P4 connector of Fuse Board. Measure for
120VAC between pins 4 and 6 of plug from Transformer. If OK,
proceed to step 5. If not OK, replace Transformer.

5. Fuse Board is defective

Replace Fuse Board.

Bad Board

1. Defective Control Module Replace Control Module.

Communication
Error between
Control Module
and Display
Interface
Assembly

1. Disconnect and then reconnect power to heater.
2. Check for faulty wiring or Inspect Display Interface Wiring. Ensure Display Interface Plug is
connection.
securely attached to Control Module. If OK, proceed to step 2.

Igniter Failure

1. Check for faulty wiring or Inspect Igniter wiring. Ensure Igniter Plug is securely attached to
connection.
If OK, proceed
to step 2.
USE Control
ONLYModule.
HAYWARD
GENUINE
REPLACEMENT PARTS

3. Control Module and/or
Display Interface Assembly
are defective.

2. Igniter is defective

Keypad Failure

1. Keypad is defective

Replace Control Module and/or Display Interface Assembly.

Replace Ignitier.

Pomona, CA Clemmons, NC Nashville, TN
Tel:
908-351-5400
www.haywardpool.com
Replace Display
Interface
Assembly.

Figure 32: TROUBLESHOOTING

Code

Fault

Diagnosis Step

Temperature
sensor input
failure

1. Check for faulty wiring or Inspect sensor wiring. Ensure sensor is pluggd into back of control
connection.
module. If OK, proceed to step 2.
2. Sensor is defective

Replace temperature sensor.

Water
Temperature
Sensing Error

1. Check remote thermostat
setting

Verify set point setting of remote thermostat is at or below 104°F. If
set point of remote thermostat is OK, or if heater is not configured for
remote thermostat, proceed to step 2.

2. Verify that the water flow
is adequate

Verify that water flow to heater is above minimum required (20 GPM for
H150FD and H200FD, 25 GPM for H250FD and H300FD, 30 GPM for
H350FD and H400FD). Note that intermittent periods of low water flow
will cause this error. If OK, proceed to step 3.

3. Check inlet water
temperature sensor

Compare the heater's temperature reading to the pool water temperature
with an accurate thermometer. If significantly different, replace inlet
water temperature sensor.

Flame Present
with Gas Valve
not Energized
Bypass
Operation

1. Gas Valve is defective

Replace Gas Valve

1. Check to see if Control
Module is in Bypass
Operation

This is normal display when heater is being controlled by a remote
thermostat. No service is required. If heater is not being controlled by
remote thermostat, change setting by using the MODE key to put the
heater into STANDBY. Press and hold the DOWN key and then press
and hold the MODE key. Hold down both keys for 3 seconds until the
indication ‘‘bO’’ is removed from the display.

Water pressure
switch fault

1. Verify that the pump is
running.

This is a normal display when the pump is off. Turn pump on. LO code
should clear. If LO does not clear, proceed to step 2.

2. Verify that water flow is
adequate

Verify that water flow rate to heater is above minimum required (20
GPM for H150FD and H200FD, 25 GPM for H250FD and H300FD, 30
GPM for H350FD and H400FD). If OK, proceed to step 3

Remedy

3. Check for faulty wiring or Inspect water pressure switch wiring. Ensure wire harness terminals are
connection.
securely fastened to spade terminals on water pressure switch. If OK,
procced to step 4.

Vent pressure
switch fault
(applies only
if indoor
installation)

4.Verify state of water
pressure switch contacts.

Remove wire leads from water pressure switch and jumper leads.
Operate heater. Measure continunity across water pressure switch.
If open, proceed to step 5. If closed, LO code is not caused by water
pressure switch fault. Remove jumper from wire leads and reconnect
wire leads to water pressure switch.

5. Ensure that low pump
pressure does not exist.

Clean filter or clear blockages. Check position of valves in plumbing
system. If OK proceed to step 6.

6. Check for correct water
pressure switch setting.

Adjust water pressure switch setting as shown on page 33 of Installation
Manual (only if heater is above or below water level). If LO does not
clear, proceed to step 7.

7. Water pressure switch is
Replace water pressure switch.
defective
1. Check for faulty wiring or Inspect vent pressure switch wiring. Ensure wire harness terminals are
connection.
securely fastened to spade terminals on vent pressure switch. If OK,
proceed to step 2.

2. Verify state of vent
pressure contacts.

Remove wire leads from vent pressure switch and jumper leads. Operate
heater. Measure continuity across vent pressure switch. If closed, LO code is
not caused by vent pressure switch fault. If open, proceed to step 3. Remove
jumper from wire leads and reconnect wire leads to vent pressure switch.

3. Check for restricted or
blocked flue.

Ensure that flue is not blocked or restricted. See indoor vent sizing
requirements in installation manual. If OK, proceed to step 4.

4. Vent pressure switch is
defective.

Replace vent pressure switch.

Figure 32: TROUBLESHOOTING
Code

Fault

Diagnosis Step

Temperature
1. Check for faulty wiring or Inspect temperature limit switch wiring. Ensure wire harness teminals
limit switch fault connection.
are securely fastened to spade terminals on temperature limit switches.

Remedy

If OK, proceed to step 2.

Temperature
2. Verify state of temperature Remove wire leads from limit switch and jumper leads. Operate heater.
limit switch fault limits’ contacts
Measure continity across limit switches. If closed, LO code is not
(cont’d)
caused by temperature limit switch fault. If open, proceed to step 3.
Remove jumper from leads and reconnect leads to temperature limits.

Ignition Failure

3. Verify that water flow is
adequate

Verify that water flow rate to heater is above the minimum required
(20 GPM for H150FD and H200FD, 25 GPM for H250FD and H300FD,
30 GPM for H350FD and H400FD). If OK, proceed to step 4.

4. Temperature limit switch
is defective.
1. Ensure gas supply shutoff
valves are open.

Replace temperature limit switch.

2. Check for low gas supply
pressure

Ensure inlet gas supply pressure is between the minimum and maximum
values indicated on rating plate. If OK, proceed to step 3.

3. Check for faulty flame
sense wiring or connection.

Inspect flame sense wiring. Ensure wire harness terminals are securely
fastened to flame sense and to control module. If OK, proceed to step 4.

Ensure that main gas shutoff installed adjacent to heater is open. Ensure
that knob on gas valve inside unit is in ‘‘on’’ position. If OK, proceed to
step 2.

4. Check for faulty gas valve Inspect gas valve wiring. Ensure wire harness terminals are securely
wiring or connection
fastened to spade terminals on gas valve. If OK, proceed to step 5.

5. Check for gas valve
failure or gas valve relay
failure.

1. Measure voltage across gas valve during trial for igintion. If 24VAC
is present and gas valve does not open, gas valve is defective. Replace
gas valve.
2. If 24VAC is not present, gas valve relay on control module is
defective. Replace control module.

Blower vacuum
switch closed.

Blower vacuum
switch open.

6. Check for blockages in
gas orifices and burners

Inspect gas orifices for blockages which could prevent gas flow. Remove
and inspect burners for blockages.

1. Check for defective
blower on relay or control
module.

Disconnect Blower plug fron Control Module. With heater off, measure
continuity across pins 1 and 2 of receptacle on Control Module. If
closed, control module relay is defective. Replace control module. If
OK, proceed to step 2.

2. Vacuum switch is
defective.
1. Check for faulty vacuum
switch tubing
2. Check for faulty vacuum
switch wiring or connection.

Replace blower vacuum switch.

3. Check for faulty blower
wiring or connection

Inspect blower wiring. Ensure plug on blower is securely fastened to
control module. If OK, proceed to step 4.

4. Check for defective
vacuum switch

Disconnect Blower plug from Control Module. Measure resistance
across Blower windings. Winding resistance across lead should be in
the following range; Red-to-White: 8 to 9 ohms. If measured values
vary substantially from these values, Blower is defective. Replace. If
OK, proceed to step 5.

5. Check for defective
blower relay.

Disconnect Blower plug from Control Module. Place heater in Pool
or Spa Mode. Lower set point temperature to generate call for heat.
During pre-purge period, measure for 120VAC across pins 1 and 2. If
120VAC is not present, control module relay is defective. Replace
control module. If OK, proceed to step 6

6. Vacuum switch is
defective

Replace blower vacuum switch.

Check tubing and replace if necessary. If OK, proceed to step 2.
Inspect vacuum switch wiring. Ensure wire harness terminals are
securely fastened to spade terminals on vacuum switch. If OK, proceed
to step 3.

HAYWARD POOL HEATER CERTIFICATE OF LIMITED WARRANTY

Limited heater warranty:
TERMS AND COVERAGE: We warrant our pool heater to be free from defects in workmanship and materials under normal use and service. Pursuant to this warranty and subject to the Conditions and
Exceptions indicated below:
1. We will replace (cost of freight, installation, cost of fuel, and service labor at user’s expense) with
the prevailing comparable model, or, at our option, repair any pool/spa heater that leaks under normal use and service within one year from the date of original installation for all users.
2. In addition, we will replace (cost of freight, installation, cost of fuel, and service labor at user’s
expense) or, at our option, repair any part or parts of the pool/spa heater which malfunctions under
normal use and service within one year from the date of original installation for all users.
LIMITATION ON IMPLIED WARRANTIES: WE ARE NOT LIABLE FOR ANY CONSEQUENTIAL
DAMAGES FOR BREACH OF ANY WRITTEN OR IMPLIED WARRANTY OF THIS PRODUCT. Implied warranties, including the WARRANTY of MERCHANTABILITY and all other implied warranties that
may arise from course of dealing or usage of trade imposed on the sale of this heater under laws of the state
are limited in duration to the term of one (1) year for all users. There are no warranties which extend beyond
the description on the face hereof. We shall not in any event be held liable for any special, indirect, or consequential damages.

EXPENSE OF DELIVERY AND INSTALLATION:

Each pool heater or replacement part to be furnished under this warranty shall be furnished at our nearest
distribution center. We shall not pay, nor be responsible for shipping or delivery charges to the place of installation, nor for labor charges or other costs of removal or installation. Every defective heater or part replaced
under this warranty shall become our property, and as such, must be returned to our distribution center with
transportation charges paid by the user. Any replacement pool heater furnished under this warranty shall remain in warranty only for the unexpired portion of this warranty.

CONDITIONS AND EXCEPTIONS:

This warranty applies only to the pool/spa at its original place of installation and only for the original
owner. It does not apply if the pool heater is installed in violation of any applicable code or ordinance, or is
not installed, operated and maintained in accordance with our instructions, or is misused, damaged by accident, weather, act of God, freezing, water void and/or excess pressure, altered or disconnected. It does not
apply with respect to:
1. A heater not equipped with Certified C.S.A. limit controls or equivalent pressure relief valve.
2. A heater operated with settings in excess of, and/or with fuel not conforming to those shown on rating plate;
3. A heater on which the serial numbers have been altered, defaced, or removed.
4. Leaks arising from defective installation;
5. Production of noise, odors, or discolored (rusty, etc.) water;
6. Leakage substantially contributed to by sediment, lime precipitate and/or higher than normal dissolved solids (pH above 7.8) in the tank, copper tubes, or water ways;
7. Leakage caused substantially contributed to by corrosive elements in the atmosphere (such as the
storage of chlorine or other chemicals);
8. Leakage caused substantially or contributed to by corrosive pool water in an acid condition (pH
below 7.2);
9. Damage caused substantially or contributed to by an external source of energy;
10. A pool/spa heater is a water containing device. Leakage of water from this device can be expected
at some time due to malfunction or the limitations
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
www.haywardpool.com

59
of the service life of various components. Do not install this product where such leakage can cause damage.
MANUFACTURER IS NOT RESPONSIBLE OR LIABLE FOR ANY COSTS INCURRED BY SUCH
DAMAGE.
IN NO CASE ARE WE TO BE HELD LIABLE FOR DAMAGE
TO SURROUNDING AREA OR PROPERTY
CAUSED BY LEAKAGE OR MALFUNCTION.

HOW TO CLAIM UNDER THIS WARRANTY:

The original owner, upon discovering the defect, must present the attached completed warranty claim card
with proof of purchase either to the dealer or notify the Company in writing at either address:
HAYWARD POOL PRODUCTS, INC.
620 DIVISION ST.
ELIZABETH, NJ 07207
OR
HAYWARD POOL PRODUCTS, INC.
2875 POMONA BOULEVARD
POMONA, CA 91768
Upon receipt of such notification we shall decide whether to repair such parts or replace any pool heater,
reserving at all times the right to inspect in order to verify any claimed defect. We also reserve the right to
have our representatives make any inspections, repairs, or to furnish replacements. This warranty is intended
as a legally binding obligation of the Company, enforceable in the courts. This warranty may give you specific legal rights which may vary from state to state.

LIMITATION ON LIABILITY:

All intended representations have been expressly set forth in this document. This warranty may not be
extended by oral or any other additional representations, written sales information, drawings, or other malfunction, is strictly limited to repair or replacement of the defective heater or part, as provided herein and
the Company is not responsible hereunder for incidental or consequential or incidental costs or damages.
The company neither assumes, nor authorizes any person or firm to assume for us, any further liability or
obligation in connection with the sale, installation, use, maintenance, or existence of the heater. SAFETY
WARNING: Pool heaters are heat producing appliances and to avoid damage or injury in the event of possible overheating of the outer jacket (1) no materials should be stored against the jacket and (2) care should
be taken to avoid unnecessary contact (especially by children) with the jacket. When lighting a gas heater, the
lighting instructions must be followed exactly to prevent “flashback” of excess gas in the heater. Electronic
ignition heaters and electric heaters must have the power shut off when making adjustments to, servicing, or
coming into contact with the heater. UNDER NO CIRCUMSTANCES SHOULD FLAMMABLE MATERIALS, SUCH AS GASOLINE OR PAINT THINNERS, BE USED OR STORED IN THE VICINITY OF THE
HEATER OR IN ANY LOCATION FROM WHICH FUMES COULD REACH THE HEATER. For your
comfort, enjoyment and safety, please read the enclosed operating instructions carefully.
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
www.haywardpool.com

SERVICE PARTS

2
5

4
6

31
3

26
22

27
32
27

36
33

30
41

Bronze Header Models (ASME)

Plastic Header Models (Non-ASME)

ITEM

6
7
8
9
10

PART NO.

FDXLJKT1150
FDXLJKT1200
FDXLJKT1250
FDXLJKT1300
FDXLJKT1350
FDXLJKT1400
FDXLJKT1250A
FDXLJKT1400A
FDXLTFC1150
FDXLTFC1200
FDXLTFC1250
FDXLTFC1300
FDXLTFC1350
FDXLTFC1400
FDXLTFC1250A
FDXLTFC1400A
FDXLFAD1150
FDXLFAD1200
FDXLFAD1250
FDXLFAD1300
FDXLFAD1350
FDXLFAD1400
FDXLFAD1250A
FDXLFAD1400A
FDXLRAD1150
FDXLRAD1200
FDXLRAD1250
FDXLRAD1300
FDXLRAD1350
FDXLRAD1400
FDXLRAD1250A
FDXLRAD1400A
FDXLTFP1150
FDXLTFP1200
FDXLTFP1250
FDXLTFP1300
FDXLTFP1350
FDXLTFP1400
FDXLTFP1250A
FDXLTFP1400A
FDXLUEC1930
FDXLLEC1930
FDXLLTP1930
FDXLRTP1930
FDXLLJC1930
FDXLRJC1930
FDXLPBL1930

DESCRIPTION

JACKET TOP - H150FD
JACKET TOP - H200FD
JACKET TOP - H250FD
JACKET TOP - H300FD
JACKET TOP - H350FD
JACKET TOP - H400FD
JACKET TOP, GRAY, ASME - H250FD
JACKET TOP, GRAY, ASME - H400FD
TOP FLUE COVER - H150FD
TOP FLUE COVER - H200FD
TOP FLUE COVER - H250FD
TOP FLUE COVER - H300FD
TOP FLUE COVER - H350FD
TOP FLUE COVER - H400FD
TOP FLUE COVER, GRAY, ASME - H250FD
TOP FLUE COVER, GRAY, ASME - H400FD
FRONT ACCESS DOOR ASSY - H150FD
FRONT ACCESS DOOR ASSY - H200FD
FRONT ACCESS DOOR ASSY - H250FD
FRONT ACCESS DOOR ASSY - H300FD
FRONT ACCESS DOOR ASSY - H350FD
FRONT ACCESS DOOR ASSY - H400FD
FRONT ACCESS DOOR ASSY, GRAY, ASME - H250FD
FRONT ACCESS DOOR ASSY, GRAY, ASME - H400FD
REAR ACCESS DOOR ASSY - H150FD
REAR ACCESS DOOR ASSY - H200FD
REAR ACCESS DOOR ASSY - H250FD
REAR ACCESS DOOR ASSY - H300FD
REAR ACCESS DOOR ASSY - H350FD
REAR ACCESS DOOR ASSY - H400FD
REAR ACCESS DOOR ASSY, GRAY, ASME - H250FD
REAR ACCESS DOOR ASSY, GRAY, ASME - H400FD
TOP FRONT PANEL - H150FD
TOP FRONT PANEL - H200FD
TOP FRONT PANEL - H250FD
TOP FRONT PANEL - H300FD
TOP FRONT PANEL - H350FD
TOP FRONT PANEL - H400FD
TOP FRONT PANEL, GRAY, ASME - H250FD
TOP FRONT PANEL, GRAY, ASME - H400FD
UPPER END CAP
LOWER END CAP
LEFT TRIM PANEL
RIGHT TRIM PANEL
JUNCTION BOX COVER, LEFT
JUNCTION BOX COVER, RIGHT
BASE LEG

Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
www.haywardpool.com

ITEM
12
13

16
17

20
21
22
23
24

PART NO.

DESCRIPTION

FDXLFCS1930
FDXLRGK1151
FDXLRGK1201
FDXLRGK1251
FDXLRGK1301
FDXLRGK1351
FDXLRGK1401
FDXLHBP1150
FDXLHBP1200
FDXLHBP1250
FDXLHBP1300
FDXLHBP1350
FDXLHBP1400
FDXLBBN1150
FDXLBBN1200
FDXLBBN1250
FDXLBBN1300
FDXLBBN1350
FDXLBBN1400
FDXLIAC1930
FDXLGSV0001
FDXLGSV0002
FDXLBON1930
FDXLBOP1930
FDXLMAN1150
FDXLMAN1200
FDXLMAN1250
FDXLMAN1300
FDXLMAN1350
FDXLMAN1400
FDXLGCK1150NP
FDXLGCK1150PN
FDXLGCK1200NP
FDXLGCK1200PN
FDXLGCK1250NP
FDXLGCK1250PN
FDXLGCK1300NP
FDXLGCK1300PN
FDXLGCK1350NP
FDXLGCK1350PN
FDXLGCK1400NP
FDXLGCK1400PN
FDXLBWR1930
FDXLBVS1930
FDXLICB1930
FDXLFWP1930
FDXLIGN1930

FLUE COLLECTOR SIDE PANEL
RAIN GUARD ASSEMBLY - H150FD
RAIN GUARD ASSEMBLY - H200FD
RAIN GUARD ASSEMBLY - H250FD
RAIN GUARD ASSEMBLY - H300FD
RAIN GUARD ASSEMBLY - H350FD
RAIN GUARD ASSEMBLY - H400FD
HEAT BARRIER PANEL - H150FD
HEAT BARRIER PANEL - H200FD
HEAT BARRIER PANEL - H250FD
HEAT BARRIER PANEL - H300FD
HEAT BARRIER PANEL - H350FD
HEAT BARRIER PANEL - H400FD
BLOWER INLET BAFFLE - H150FD
BLOWER INLET BAFFLE - H200FD
BLOWER INLET BAFFLE - H250FD
BLOWER INLET BAFFLE - H300FD
BLOWER INLET BAFFLE - H350FD
BLOWER INLET BAFFLE - H400FD
IGNITER ACCESS COVER
GAS VALVE, NATURAL
GAS VALVE, PROPANE
BURNER ORIFICE KIT, NATURAL
BURNER ORIFICE KIT, PROPANE
GAS MANIFOLD - H150FD
GAS MANIFOLD - H200FD
GAS MANIFOLD - H250FD
GAS MANIFOLD - H300FD
GAS MANIFOLD - H350FD
GAS MANIFOLD - H400FD
CONVERSION KIT, NA TO LP, QUICK-CHANGE - H150FD
CONVERSION KIT, LP TO NA, QUICK-CHANGE - H150FD
CONVERSION KIT, NA TO LP, QUICK-CHANGE - H200FD
CONVERSION KIT, LP TO NA, QUICK-CHANGE - H200FD
CONVERSION KIT, NA TO LP, QUICK-CHANGE - H250FD
CONVERSION KIT, LP TO NA, QUICK-CHANGE - H250FD
CONVERSION KIT, NA TO LP, QUICK-CHANGE - H300FD
CONVERSION KIT, LP TO NA, QUICK-CHANGE - H300FD
CONVERSION KIT, NA TO LP, QUICK-CHANGE - H350FD
CONVERSION KIT, LP TO NA, QUICK-CHANGE - H350FD
CONVERSION KIT, NA TO LP, QUICK-CHANGE - H400FD
CONVERSION KIT, LP TO NA, QUICK-CHANGE - H400FD
COMBUSTION BLOWER
BLOWER VACUUM SWITCH
INTEGRATED CONTROL BOARD
FIELD WIRING PANEL
IGNITOR

Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
www.haywardpool.com

ITEM
25
26
27
28

29
30
31
32

34
35
36
37
38
39
40
41

PART NO.

DESCRIPTION

IDXLFLS1930
IDXL2TRF1930
FDXLWPS1930
IDXL2DB1930
FDXLBKP1930
FDXLBKP1931
FDXLGSK1932
FDXLHLI1930
FDXLTER1930
FDXLGSK1934
FDXLHXA1150
FDXLHXA1200
FDXLHXA1250
FDXLHXA1300
FDXLHXA1350
FDXLHXA1400
FDXLHXA1250A
FDXLHXA1400A
FDXLFHD1930
FDXLFHA1930
FDXLHDW1930
FDXLHMB1930
FDXLBKP1930
CHXPLG1930
FDXLCRN1930
SPX4000FG
FDXLDRV1930A
CHXRLV1930

FLAME SENSOR
TRANSFORMER
WATER PRESSURE SWITCH
DISPLAY BOARD ONLY
BEZEL & KEYPAD ASSEMBLY
BEZEL & KEYPAD ASSEMBLY, BLUE, ASME
GASKET, BEZEL/TOP
HIGH LIMIT KIT
THERMISTOR
GASKET, CC FRONT/AIR BOX - ALL MODELS
HEAT EXCHANGER ASSY - H150FD
HEAT EXCHANGER ASSY - H200FD
HEAT EXCHANGER ASSY - H250FD
HEAT EXCHANGER ASSY - H300FD
HEAT EXCHANGER ASSY - H350FD
HEAT EXCHANGER ASSY - H400FD
HEAT EXCHANGER ASSY, ASME - H250FD
HEAT EXCHANGER ASSY, ASME - H400FD
INLET/OUTLET HEADER ONLY
INLET/OUTLET HEADER ASSY
HEADER HARDWARE KIT
HEADER MOUNTING BASE KIT
BYPASS CARTRIDGE KIT
3/4” BRASS PLUG
HEADER CARTRIDGE RETAINING NUT
DRAIN PLUG WITH GASKET
DRAIN VALVE, ASME
PRESSURE RELIEF VALVE

NOT SHOWN:
--FDXLGSK1930

--FDXLGSK1931

--FDXLGSK1933

GASKET KIT, AIR SIDE - ALL MODELS
INCLUDES:
GASKET, BLOWER MOUNTING
GASKET, IGNITER COVER
GASKET, COVER/AIR BOX FRONT - ALL MODELS
GASKET, MANIFOLD/AIR BOX - ALL MODELS
GASKET KIT, EXHAUST SIDE - ALL MODELS
INCLUDES:
GASKET, FLUE COLLECTOR SIDE
GASKET, RAIN GUARD SIDE
GASKET, RAIN GUARD BOTTOM SIDE
GASKET, FLUE COLLECTOR TOP - ALL MODELS
GASKET, RAIN GUARD FRONT & REAR - ALL MODELS
GASKET, RAIN GUARD BOTTOM FRONT & REAR - ALL MODELS
INSULATION, RETURN SIDE TUBE SHEET

Pomona, CA Clemmons, NC Nashville, TN
Tel: 908-351-5400
www.haywardpool.com

ITEM

PART NO.

NOT SHOWN (CONTINUED):
--FDXLBRN1930
--FDXLFOR1930
--FDXLWHA1930
--FDXLVSJ1930
--FDXLFSK1930
--FDXLFSKF30
--FDXLFSKC30
--SPX3200UNKIT
--FDXLUNK1930A
--FDXLTDK1930
--FDXLDRV1930A
--UHXNEGVT11501
--UHXNEGVT12001
--UHXNEGVT12501
--UHXNEGVT13001
--UHXNEGVT13501
--UHXNEGVT14001
--UHXPOSHZ11501
--UHXPOSHZ12001
--UHXPOSHZ12501
--UHXPOSHZ13001
--UHXPOSHZ13501
--UHXPOSHZ14001
--UHXHD6ETERM
--UHXHD6STERM
--UHXHD6ELBOW
--UHXHD6PIPE18
--UHXHD6PIPE24
--UHXHD6PIPE36
--UHXHD8STERM
--UHXHD8ELBOW
--UHXHD8PIPE18
--UHXHD8PIPE24
--UHXHD8PIPE36
--FDXLCNK0001
--FDXLCNK0002
--FDXLHAK1930
--FDXLVPS1930
--FDXLVPS1931

Hayward Pool Products, Inc.
620 Division St.
Elizabeth, NJ 07207

DESCRIPTION
BURNER
HEADER O-RING KIT
WIRING HARNESS KIT, COMPLETE
VOLTAGE SELECTOR JUMPER
FUSE SERVICE KIT
FUSE KIT, 3.0A, FOR FIELD WIRING PANEL (QTY 10)
FUSE KIT, 3.0A, FOR INTEGRATED CONTROL BOARD (QTY 10)
UNION KIT (INCLUDES FITTINGS, UNION NUTS, GASKETS)
ASME UNION FLANGE KIT (INCL. FITTINGS, BOLTS, GASKETS)
TIE-DOWN KIT
DRAIN VALVE, ASME
INDOOR VENT ADAPTER KIT, NEG-PRESS (VERTICAL) - H150FD
INDOOR VENT ADAPTER KIT, NEG-PRESS (VERTICAL) - H200FD
INDOOR VENT ADAPTER KIT, NEG-PRESS (VERTICAL) - H250FD
INDOOR VENT ADAPTER KIT, NEG-PRESS (VERTICAL) - H300FD
INDOOR VENT ADAPTER KIT, NEG-PRESS (VERTICAL) - H350FD
INDOOR VENT ADAPTER KIT, NEG-PRESS (VERTICAL) - H400FD
INDOOR VENT ADAPTER KIT, POS-PRESS (HORIZONTAL) - H150FD
INDOOR VENT ADAPTER KIT, POS-PRESS (HORIZONTAL) - H200FD
INDOOR VENT ADAPTER KIT, POS-PRESS (HORIZONTAL) - H250FD
INDOOR VENT ADAPTER KIT, POS-PRESS (HORIZONTAL) - H300FD
INDOOR VENT ADAPTER KIT, POS-PRESS (HORIZONTAL) - H350FD
INDOOR VENT ADAPTER KIT, POS-PRESS (HORIZONTAL) - H400FD
HEATFAB STAINLESS VENT KIT, 6” HORIZONTAL ELBOW TERMINAL
HEATFAB STAINLESS VENT KIT, 6” HORIZONTAL STRAIGHT TERMINAL
HEATFAB STAINLESS VENT KIT, 6” 90-DEGREE ELBOW
HEATFAB STAINLESS VENT KIT, 6” VENT PIPE, 18” LONG
HEATFAB STAINLESS VENT KIT, 6” VENT PIPE, 24” LONG
HEATFAB STAINLESS VENT KIT, 6” VENT PIPE, 36” LONG
HEATFAB STAINLESS VENT KIT, 8” HORIZONTAL STRAIGHT TERMINAL
HEATFAB STAINLESS VENT KIT, 8” 90-DEGREE ELBOW
HEATFAB STAINLESS VENT KIT, 8” VENT PIPE, 18” LONG
HEATFAB STAINLESS VENT KIT, 8” VENT PIPE, 24” LONG
HEATFAB STAINLESS VENT KIT, 8” VENT PIPE, 36” LONG
GAS CONVERSION KIT, NA TO LP
GAS CONVERSION KIT, LP TO NA
CONVERSION KIT, HIGH ALTITUDE, 2,000-10,100 FT
VENT PRESSURE SWITCH, INDOOR, 0-2,000 FT
VENT PRESSURE SWITCH, INDOOR, 2,000-10,100 FT

Hayward Pool Products, Inc. Hayward Pool Products, Inc.
2875 Pomona Boulevard
2880 Plymouth Drive
Pomona, CA 91768
Oakville, Ontario L6H 5R4

Hayward S.A.
Zoming de Jumet
B6040 Jumet, Belgium

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Hayward H200FDN Manual

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