Raypak 337A User Manual (English)

Other manuals for Raypak 337A

Installation And Operation Manual48 pages

Questions and Answers:

M
Matthew JohnsonAug 22, 2025
Why is my Raypak 337A turning on and off repeatedly?
- W
  walter09Aug 22, 2025
  If your Raypak Gas Heater is going on and off continuously, the issue could stem from a few different causes. The filter might be dirty, requiring a cleaning or replacement. The water level in your pool might be too low, so try raising it. The external bypass setting may be out of adjustment, requiring an adjustment. Lastly, the pressure switch could be out of adjustment, and you should adjust it.
J
jimmy58Aug 25, 2025
Why does my Raypak Gas Heater have a yellow lazy flame?
- D
  Dean YoungAug 25, 2025
  If your Raypak Gas Heater is producing a yellow, lazy flame, it could be due to low gas pressure, in which case you should adjust the gas pressure. Another potential cause is insects or debris clogging the burner intake ports; if this is the case, clean the burners.
A
Austin HillAug 25, 2025
What to do if the combustion fan is not running on my Raypak Gas Heater?
- D
  Damon LevineAug 26, 2025
  If the combustion fan in your Raypak Gas Heater is not running, it could be due to several reasons. The fan relay might be faulty, so replace it. There might be a loose connection or a failed motor in the fan itself. A burned motor due to incorrect wiring could also be the cause, so replace the blower. Finally, the air pressure switch might need replacement.
H
Holly CollinsAug 27, 2025
What to do if my Raypak Gas Heater takes too long to heat pool or spa?
- E
  Ethan GreenAug 27, 2025
  If your Raypak Gas Heater is taking too long to heat your pool or spa, consider these potential causes: * The heater might be undersized. Calculate the heating capacity of the heater using the formula: Heater output (BTUH) = Pool gallonage x 8.33, or refer to the heater sizing chart. * The filter might not be running long enough; reset the time clock. * The filter could be dirty; clean the filter. * The gas line or meter may be undersized; refer to the installation instructions.
R
Robin GillespieAug 27, 2025
What to do if Raypak 337A combustion fan is not running?
- B
  Brian HowardAug 27, 2025
  If the combustion fan in your Raypak Gas Heater isn't running, it could be due to a few reasons. The fan relay might be faulty, requiring replacement. There could be a loose connection or a failed motor in the fan itself. A burned motor due to incorrect wiring could also be the cause, necessitating blower replacement. Finally, the air pressure switch might need replacing.
E
Eric MooreAug 28, 2025
Why does my Raypak 337A take so long to heat my pool or spa?
- A
  Andrew BrownAug 29, 2025
  If your Raypak Gas Heater takes too long to heat your pool or spa, several factors could be at play. It may be that the heater is undersized. You can calculate the heating capacity of your heater using the formula: Heater output (BTUH) / (Pool gallonage x 8.33), or refer to the heater sizing chart. Remember that this calculation doesn't account for heat loss due to weather. The filter may not be running long enough, so try resetting the time clock. A dirty filter could also be the culprit, so try cleaning it. Finally, the gas line or meter might be undersized.
J
jamestashaAug 30, 2025
What causes sooting in my Raypak Gas Heater?
- J
  Jeremy ZimmermanAug 30, 2025
  If your Raypak Gas Heater is sooting, it could be due to several reasons. High flow rates might be the cause; reduce them by adding a manual bypass valve and adjust it until the heater outlet water temperature is between 105°F and 110°F. The U.G. might be inoperative; check its movement by putting it in hot water (110°F or higher), and replace it if there's no movement. Air starvation could be the issue. Improper venting could also cause sooting. Insects or debris clogging the burner intake ports can also lead to sooting; clean the burners in this case.
H
herreracarlosAug 31, 2025
What to do if the outer jacket of my Raypak 337A is very hot and the paint is blistered?
- N
  Nicholas BlackwellAug 31, 2025
  If the outer jacket of your Raypak Gas Heater is very hot and the paint is blistered, it could be due to a broken refractory caused by shipping damage or improper combustion, in which case you should replace the refractory panels. Another cause could be excessive sooting of the heat exchanger; determine the cause of sooting and correct it.
W
wjonesSep 1, 2025
What causes a pilot outage or weak flame signal in my Raypak 337A?
- M
  Mary MedinaSep 1, 2025
  If you're experiencing a pilot outage or a weak flame signal in your Raypak Gas Heater, it could be due to low gas pressure, so adjust the gas pressure. It could also be due to a restricted or dirty pilot, so clean the pilot and/or electrode. Alternatively, the pilot generator might be weak, in which case you should replace the pilot.
C
Cassandra SchneiderSep 3, 2025
How to fix harmonics or whining noise coming from my Raypak 337A Gas Heater?
- J
  Jeffrey StephensSep 3, 2025
  If your Raypak Gas Heater is producing harmonics or a whining noise, it could be due to several reasons. The U.G. might be inoperative; check its movement by putting it in hot water (110°F or higher), and replace it if there's no movement. There might be debris or a restriction in the system; locate the restriction and remove it, then flush and clean the system. Debris in the gas line could also be the cause; remove the debris or blow out the gas line. Low flow could also be the problem; scale may be forming in the heat exchanger, so clean the heat exchanger and check the pool's pH and total alkalinity.

Raypak 337A Specifications

General

Brand	Raypak
Model	337A
Category	Gas Heater
Language	English

Summary

Water Chemistry

Water Chemistry Recommendations

Guide for balanced water chemistry levels for pools and spas.

Owner's Operating Instructions

Start-Up Procedures

Steps for safely starting the pool/spa heater.

Before Start-Up

Pre-operation checks for burners and water flow.

Millivolt System Operation

Millivolt Lighting Instructions

Step-by-step guide to manually light the pilot.

Millivolt Shut-Off Procedure

Steps for safely turning off the millivolt system.

Millivolt Gas Leak Safety

Immediate actions to take if you smell gas.

Electronic Ignition System Operation

Electronic Ignition Operating Instructions

Steps for operating a heater with automatic pilot ignition.

Electronic Ignition Shut-Off Procedures

Steps for safely turning off the electronic ignition system.

Electronic Ignition Gas Leak Safety

Immediate actions to take if you smell gas.

Cautionary Information

After Start-Up Checks

Post-operation checks for inlet/outlet pipe temperature.

Atmospheric Heater Visual Inspection

Checking pilot and main burner flame patterns.

Water Pressure Switch Function

Ensuring the switch operates correctly for safety.

Maintenance and Care Procedures

General Maintenance Checks

Routine inspection and cleaning of heater components.

Pool & Spa Water Chemistry

Maintaining water chemistry to protect the heater and equipment.

Chemical Feeders and Chlorinators

Guidelines for using chemical feeders and chlorinators.

Cold Weather Operation and Winterizing

Freeze Information and Warnings

Guidelines for operating in freezing temperatures.

Winterizing the Pool & Spa Heater

Procedure for shutting down the heater for winter.

Installation and Service Instructions

Receiving and Inspecting Equipment

Checking for damage and verifying package contents upon receipt.

General Specifications

Safety Warnings and Notices

Important safety information regarding installation and operation.

Code Requirements

Compliance with national and local installation codes.

Clearances and Installation Locations

Clearances from Combustible Construction

Minimum distances required from flammable materials.

Outdoor Heater Installation

Specifics for installing the heater outdoors.

Installation Requirements

Florida Building Code Compliance

Specific installation requirements for Florida based on building code.

Heater Installation

Indoor Installation Guidelines

Requirements and considerations for indoor heater placement.

Outdoor/Indoor Stack Kits

Information on optional stack kits for venting.

Specifications and Dimensions

Atmospheric Units Specifications

Technical data and dimensions for atmospheric models.

Specifications and Dimensions

Lo NOx Units Specifications

Technical data and dimensions for Lo NOx models.

Combustion and Ventilation Air

Air Supply Requirements

Minimum net free air openings for combustion and ventilation.

Vent Piping and Power Vent Kit

Requirements for vent pipe installation and power vent options.

Gas Supply Connections

Ventilation and Vent Pipe Requirements

Guidelines for proper vent pipe installation and clearance.

Gas Supply Pressure Requirements

Required gas pressures for natural and propane gas.

Gas System Setup

Gas Pressure Adjustment

Procedures for adjusting gas pressure regulators.

Gas Pipe Sizing

Table for determining correct pipe size for gas connections.

Water Flow and Pressure

Flow Rates

Recommended flow rates for different heater models.

Heat Exchanger Pressure Drop

Pressure drop data for various flow rates and headers.

Heater Components and Operation

Polymer Headers

Details on polymer header connections and O-rings.

Cast Iron Headers

Information on cast iron header installation.

Unitherm Governor Operation

Purpose and function of the Unitherm Governor.

Water Flow Control and Safety

Bypass Valve Systems

Internal and external bypass valve functions and adjustment.

Pressure Relief Valve Installation

Procedure for installing a pressure relief valve.

Plumbing and Water Connections

Typical Installation Diagrams

Schematic diagrams for single and multiple pool heater plumbing.

Heat Exchanger Maintenance

Heat Exchanger Reversal Procedure

Steps to reverse the heat exchanger for standard models.

Electrical Wiring

Millivolt Model Wiring

Wiring instructions for millivolt system heaters.

Digital/AFT Model Wiring

Wiring instructions for digital and AFT system heaters.

Transformer Wiring and Power Supply

120 VAC Wiring

Connecting the transformer for 120 VAC power.

240 VAC Wiring

Connecting the transformer for 240 VAC power.

Wiring Diagrams

Millivolt Wiring Diagram

Schematic diagram for millivolt heater wiring.

Wiring Diagrams

Digital Models - Atmospheric Wiring Diagram

Schematic diagram for digital atmospheric heater wiring.

Wiring Diagrams

Digital/AFT Models - Lo NOx Wiring Diagram

Schematic diagram for digital/AFT Lo NOx heater wiring.

Servicing Instructions

General Location of Controls

Identifying the location of key controls on atmospheric and Lo NOx units.

Control Panel and Adjustments

Control Panel Removal

Procedure for removing the heater's control panel.

Millivolt Model Control Adjustments

Adjusting temperature limits on millivolt models.

Digital/AFT Model Control Adjustments

Using temperature adjust buttons on digital/AFT models.

Digital Thermostat Operation

Thermostat Functions

Description of Mode, Temp buttons, and heating indicators.

Accessing Fault History File

Procedure to view past fault codes on the digital display.

Thermostat Programming

Program Button Operations

Navigating the programming menu using the program button.

Setting Factory Defaults

Restoring the thermostat to its original factory settings.

Clearing Faults

Resetting the fault history file.

Temperature Scale and Max Setpoints

Changing F/C scale and setting maximum temperature limits.

Diagnostics and Fault Codes

Diagnostic Readouts and Status Codes

Understanding display codes for system status and faults.

Reading and Interpreting Faults

Identifying and understanding fault codes for troubleshooting.

Remote Control Operation

Remote Control Installation

Guidelines for connecting and installing remote controls.

Activating the Remote

Steps to enable or disable remote control functionality.

AFT Thermostat Operation

AFT Thermostat Functions

Description of AFT mode, temp buttons, and heating status.

Accessing Service Menu and Diagnostics

How to access service menu and view diagnostic readings.

Status and Diagnostic Messages

Heat Status Messages

Messages indicating heater status like Heating or No Demand.

Operating Conditions

Conditions displayed during pool/spa modes like Water Sw Open.

Remote Control Wiring

Remote Wiring Installation Notes

Important notes for running remote control wiring.

2-Wire Remote Control Wiring

Wiring instructions for a 2-wire remote system.

3-Wire Remote Control Wiring

Wiring instructions for a 3-wire remote system.

Control System Integration and Safety

Time Clock and Fireman's Switch

Connecting and using time clocks or fireman's switches.

Water Pressure Switch Operation

Functionality and adjustment of the water pressure switch.

Flame Roll-Out & High Limit Safety

Safety features for flame roll-out and high limit conditions.

Component Removal and Safety

High Limit Switch Removal

Procedure for removing and replacing high limit switches.

Pilot Safety Features

How pilot safety systems work in millivolt and digital models.

Burner Tray and Main Burner Removal

Steps to remove the burner tray and main burners.

Pilot and Gas Valve Removal

Procedures for removing pilot assemblies and gas valves.

Heat Exchanger and Combustion Chamber Maintenance

Heat Exchanger Removal and Cleaning

Procedures for removing and cleaning heat exchanger tubes.

Desooting & Combustion Chamber Removal

Steps to remove soot and the combustion chamber.

Immersion Well Replacement

Steps for replacing the immersion well.

Lo NOx Heater Specifics

Unitherm Governor Replacement

Procedure for replacing the Unitherm Governor.

Lo NOx Heater Operation and Start-Up

How Lo NOx heaters operate and their start-up sequence.

Blower Adjustment, Visual Inspection, Electrical & Safety

Blower adjustment, visual checks, electrical, and safety features.

Lo NOx Component Removal

Main Burner and Orifice Removal

Steps to remove main burners and orifices on Lo NOx heaters.

Burner Tray and Gas Valve Removal

Procedures for removing burner trays and gas valves on Lo NOx units.

Pilot and Combustion Blower Removal

Steps to remove pilot assemblies and combustion blowers.

Troubleshooting Guide

Mechanical Troubleshooting

Common mechanical problems, causes, and solutions.

Electrical Troubleshooting

Millivolt System Electrical Checks

Diagnostic steps for millivolt system electrical issues.

Electronic Ignition Troubleshooting

Troubleshooting Flowchart

Step-by-step flowchart for diagnosing electronic ignition issues.

Digital/AFT Control Logic

Control Logic Flowchart

Flowchart illustrating the digital/AFT control system logic.

Diagnostic Readouts

Interpreting sensor readings and diagnostic outputs.

Replacement Parts

Ordering Replacement Parts

Information required for ordering correct replacement parts.

Parts Identification - Atmospheric Heaters

Exploded View Diagrams

Visual breakdown of atmospheric heater components.

Parts Identification - Lo NOx Heaters

Exploded View Diagrams

Visual breakdown of Lo NOx heater components.

Component Parts Diagrams

Header and Pilot Assembly Diagrams

Diagrams of various header and pilot assembly parts.

Atmospheric Heater Parts Catalog

Burner Tray, Controls, and Gas Valve Parts

List of part numbers for burner tray, controls, and gas valves.

Polymer Heat Exchanger Parts

List of part numbers for polymer heat exchanger components.

Atmospheric Heater Parts Catalog (Continued)

Metal Heat Exchanger and Control Box Parts

List of part numbers for metal heat exchangers and control boxes.

Miscellaneous, Pilot, Refractory, Sheetmetal, and Venting Parts

List of part numbers for miscellaneous, pilot, refractory, sheetmetal, venting.

Atmospheric Heater Parts Catalog (Continued)

Sheetmetal and Venting Parts

List of part numbers for sheetmetal and venting components.

Conversion Kits

List of part numbers for atmospheric conversion kits.

Lo NOx Heater Parts Catalog

Burner Tray, Controls, and Gas Valve Parts

List of part numbers for Lo NOx burner tray, controls, and gas valves.

Polymer Heat Exchanger Parts

List of part numbers for Lo NOx polymer heat exchanger components.

Lo NOx Heater Parts Catalog (Continued)

Metal Heat Exchanger and Control Box Parts

List of part numbers for Lo NOx metal heat exchangers and control boxes.

Miscellaneous, Pilot, Refractory, Sheetmetal, and Venting Parts

List of part numbers for Lo NOx miscellaneous, pilot, refractory, sheetmetal, venting.

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Raypak 337A User Manual

Table of Contents

Other manuals for Raypak 337A

Questions and Answers:

Raypak 337A Specifications

Summary

Water Chemistry

Water Chemistry Recommendations

Owner's Operating Instructions

Start-Up Procedures

Before Start-Up

Millivolt System Operation

Millivolt Lighting Instructions

Millivolt Shut-Off Procedure

Millivolt Gas Leak Safety

Electronic Ignition System Operation

Electronic Ignition Operating Instructions

Electronic Ignition Shut-Off Procedures

Electronic Ignition Gas Leak Safety

Cautionary Information

After Start-Up Checks

Atmospheric Heater Visual Inspection

Water Pressure Switch Function

Maintenance and Care Procedures

General Maintenance Checks

Pool & Spa Water Chemistry

Chemical Feeders and Chlorinators

Cold Weather Operation and Winterizing

Freeze Information and Warnings

Winterizing the Pool & Spa Heater

Installation and Service Instructions

Receiving and Inspecting Equipment

General Specifications

Safety Warnings and Notices

Code Requirements

Clearances and Installation Locations

Clearances from Combustible Construction

Outdoor Heater Installation

Installation Requirements

Florida Building Code Compliance

Heater Installation

Indoor Installation Guidelines

Outdoor/Indoor Stack Kits

Specifications and Dimensions

Atmospheric Units Specifications

Specifications and Dimensions

Lo NOx Units Specifications

Combustion and Ventilation Air

Air Supply Requirements

Vent Piping and Power Vent Kit

Gas Supply Connections

Ventilation and Vent Pipe Requirements

Gas Supply Pressure Requirements

Gas System Setup

Gas Pressure Adjustment

Gas Pipe Sizing

Water Flow and Pressure

Flow Rates

Heat Exchanger Pressure Drop

Heater Components and Operation

Polymer Headers

Cast Iron Headers

Unitherm Governor Operation

Water Flow Control and Safety

Bypass Valve Systems

Pressure Relief Valve Installation

Plumbing and Water Connections

Typical Installation Diagrams

Heat Exchanger Maintenance

Heat Exchanger Reversal Procedure

Electrical Wiring

Millivolt Model Wiring

Digital/AFT Model Wiring

Transformer Wiring and Power Supply

120 VAC Wiring

240 VAC Wiring

Wiring Diagrams

Millivolt Wiring Diagram

Wiring Diagrams

Digital Models - Atmospheric Wiring Diagram