What voltage does the Raypak Professional Series Atmospheric 408A require?

The Raypak Professional Series Atmospheric 408A operates on 120/240 VAC.

What are the common error codes on the Raypak Professional Series Atmospheric 408A?

Common error codes include: Sensor Failure / Sensor Open / Sensor Short, Water Sw Open, Hi Limit 1 Fault / Hi Limit 2 Fault, Ignition Lockout, Ignition Failure. See the troubleshooting section for details on each.

Raypak Professional Series Atmospheric 408A Specs, Parts & Error Codes

Specifications

Heating
BTU Capacity	399,000 BTU/hr
Gas Type	Natural Gas or Propane
Gas Inlet Connection	3/4 in. NPT
Electrical
Voltage	120/240 VAC
Phase	Single phase
Frequency	60 Hz
Performance
Min Flow (GPM)	40 GPM
Max Flow (GPM)	100 GPM
Temperature Range	32-175 F
Certifications
CSA Certified	Yes

Pros & Cons

Pros

Manual covers the Professional Series 408A atmospheric heater model.
Includes commercial/pro heater controls, diagnostics, flow charts, wiring, and parts.
Manual-backed service menu includes flame strength and fault history access.

Watchouts

This source manual is specific to the Atmospheric 408A model.
Confirm fuel type before service.
Erratic high-limit behavior may indicate heat exchanger scale or bypass problems.
Combustion and electrical checks should be performed by qualified service personnel.

Error Codes & Troubleshooting

Sensor Failure / Sensor Open / Sensor Short

Temperature sensor out of range. Inspect thermistor, wires, and connector at Terminal P1. Check resistance against chart values. Replace thermistor if not within 10%; if okay, replace the circuit board.

Water Sw Open

Water flow or pressure switch issue. Verify water flow and pressure, and clean the filter/strainer before replacing the switch.

Hi Limit 1 Fault / Hi Limit 2 Fault

High limit switch open. Verify water flow and inspect the internal thermostat and bypass valve. ASME units are manual-reset — press MODE to reset.

Ignition Lockout

Pilot flame not established, or lost during trial for main burner. Check power at the pilot valve, check for spark, and verify pilot orifice and igniter clearance.

Ignition Failure

Gas supply or valve operation issue. Verify gas is reaching the heater and confirm valve operation.

Replacement Parts

Part	Part Number	Description
105°F U.G. Service Kit (408A)	`018758F`	Manual-recommended kit for harmonics/whining noise after basic checks (debris, restriction, low flow/scale) don't resolve it.

Professional Series Atmospheric 408A

Specifications

Pros & Cons

Pros

Watchouts

Error Codes & Troubleshooting

Replacement Parts

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