Velocity Raptor RPTR155 User Manual (English)

Questions and Answers:

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Becky CollinsAug 16, 2025
What to do if the Velocity Boiler display is completely dark and there's no power light?
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  Darlene SawyerAug 16, 2025
  If the display is completely dark, the fan is off, the LWCO lights are off, and there is no green power light on the control of your Velocity Boiler, it indicates there is no 120Vac power at the boiler. Check the breaker and wiring between the breaker panel and the boiler. Also, a blown high voltage fuse could be the cause; consider replacing it with the Replacement Fuse Kit, part number 105349-01.
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Jason WhiteAug 19, 2025
What to do if Velocity Boiler is not responding to heat call, status is standby?
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  Matthew HarrellAug 19, 2025
  If your Velocity Boiler is not responding to a call for heat, and the “Status” shows “Standby” while the “Priority” shows Central Heat or Domestic Hot Water, it means the boiler is not firing because the temperature is greater than the setpoint. The water flow through the boiler primary loop may be non-existent or too low.
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alexis77Aug 22, 2025
Why is the Velocity Boiler display dark but the fan is running?
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  Tammy WhiteAug 22, 2025
  If the display of your Velocity Boiler is completely dark but the fan is running, it indicates there is no 24Vac power to the control. Possible causes include a loose 120Vac connection wiring between the boiler J-Box and transformer, a loose 24 Vac connection wiring between the transformer and the control, or a blown low voltage fuse. Consider replacing the fuse with Replacement Fuse Kit, part number 105349-01.
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Eric MayoAug 26, 2025
What does a blinking green power light on my Velocity Boiler control mean?
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  Timothy MillerAug 26, 2025
  If the green power light on the control of your Velocity Boiler is blinking, it signifies a control fault. The internal power supply is repeatedly starting and stopping, causing the light to flash, and the microprocessors are not running. Try disconnecting all terminals except 24VAC to power the Control. The green light should be steady. If it is not, then the control is defective. If steady, start plugging in all the connectors while watching the green light. When faulty wiring reconnected, green light will begin to flash.
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Joseph AlvarezAug 28, 2025
Why is my Velocity Boiler running, but the system circulator isn't?
- S
  Samuel JohnstonAug 28, 2025
  If your Velocity Boiler is running but the system or boiler circulator is not running, check the wiring for loose connections or miswiring. When there is a Domestic Hot Water Heat Request, the System or Boiler pumps will be forced “off” when the “Run Pump for” parameter is set to “Central heat, off DHW demand” or “Central Heat, Optional Priority”. This allows all of the heat to be provided for fast indirect water heater recovery. After one hour of “priority protection” or the end of the Domestic Hot Water Heat Request, the system and boiler pumps will be free to run.
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ynguyenAug 31, 2025
What causes a Velocity Boiler display to be dark, but the boiler still fires?
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  Matthew HoweAug 31, 2025
  If the display on your Velocity Boiler is completely dark, but the boiler still fires, it indicates there is no 5 Vdc power to the display. This could be due to loose 5 Vdc connection wiring between the display and the control, or a defective display or control.
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Andrew BuchananSep 3, 2025
What does “**00FF or **ERFF” mean on my Velocity Boiler display?
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  Evan BaldwinSep 3, 2025
  If your Velocity Boiler display shows “**00FF or **ERFF”, it means the display has lost communication with the control. This could be due to a loose or defective display harness, a defective display, or a defective control.
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Brandon RojasSep 6, 2025
What does error code ER0011 mean on my Velocity Boiler?
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  Jerry YoungSep 6, 2025
  If your Velocity Boiler displays error code ER0011, it indicates an Adjustment Mode Password Timeout. The control and display are not defective. The password has timed out. Simply cycle power to the display to restore operation.
H
Hannah NixonSep 9, 2025
What does error code ER0012 mean on my Velocity Boiler?
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  Melanie QuinnSep 10, 2025
  If your Velocity Boiler displays error code ER0012, it indicates the control has failed and is defective. Replace the Sage control.

Velocity Raptor RPTR155 Specifications

General

Brand	Velocity
Model	Raptor RPTR155
Category	Boiler
Language	English

Summary

Installation and Operating Instructions

Product Description and Specifications

Details the boiler's features, models, and technical specifications for proper selection and understanding.

Before Installing

Covers critical prerequisites for safe and compliant boiler installation, including codes and sizing.

Locating and Mounting the Boiler

Provides guidelines for selecting the optimal boiler location and secure wall mounting methods.

Ventilation and Venting Requirements

Outlines essential air requirements and detailed procedures for safe and effective boiler venting systems.

Gas Piping

Details the requirements for safe and correct installation of gas piping, including sizing and connection.

System Piping

Covers general precautions and specific requirements for hydronic system piping connections to the boiler.

Wiring Instructions

Provides comprehensive guidance on electrical connections, safety, and diagram interpretation for boiler setup.

Start-Up and Checkout Procedure

Outlines the step-by-step process for safely starting up and verifying the boiler's initial operation.

Boiler Operation and Controls

Explains the boiler's control system, operating modes, safety features, and temperature management.

Adjustable Parameter Configuration

Details how to access and modify boiler settings for optimal performance and system integration.

Service, Maintenance, and Troubleshooting

Service and Maintenance Procedures

Provides essential guidelines for safe boiler servicing, maintenance tasks, and safety precautions.

Troubleshooting Common Issues

Offers guidance on diagnosing and resolving common boiler faults, errors, and performance problems.

Repair Parts and Appendices

Repair Parts Identification

Lists and illustrates components for space heating and combi models for easy part identification.

Appendix A: LP Gas Conversion

Provides specific instructions for converting the boiler to operate on LP (propane) gas.

Appendix B: High Altitude Installations

Details adjustments and procedures required for boiler installation at altitudes above 4,500 feet.

Appendix C: RPTR155C Combi Manual

Offers specific installation and operation details for the RPTR155C Combi model.

Appendix D: Massachusetts Requirements

Outlines specific installation requirements for side-wall vented appliances in Massachusetts.

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Velocity Raptor RPTR155 User Manual

Table of Contents