PEERLESS PUREFIRE PF-850 User Manual

PEERLESS PUREFIRE PF-850

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PUREFIRE

®

Boilers

PF-850 PF-1000

Gas

Installation,

Operation &

Maintenance

Manual

®

Table of Contents

Default Chapter2
- Default Chapter2
  - Table of Contents2
- Using this Manual3
  - Installation Sequence3
  - Special Attention Boxes3
1 Preinstallation4
- General4
- Codes & Regulations4
- Accessibility Clearances5
- Combustion & Ventilation Air5
- Planning the Layout8
2 Boiler Set-Up9
- Stacking Multiple Boilers9
3 Venting & Air Inlet Piping10
- Approved Materials10
- Exhaust Vent/Air Intake Pipe Location10
- Exhaust Vent/Air Intake Pipe Sizing14
- Exhaust Vent/Air Intake Pipe14
- Installation14
- Test Port for Exhaust Sampling15
- Common Venting Multiple Boilers15
- Boiler Removal from Common Venting System16
4 Water Piping & Controls17
- Operating Parameters17
- System Components17
- System Piping21
- Freeze Protection21
- Special Applications26
5 Fuel Piping27
- Fuel Line Sizing27
- Gas Supply Piping - Installation27
- Gas Supply Piping - Operation28
- Main Gas Valves - Operation29
6 Condensate Trap & Drain System30
- Condensate System30
- Condensate Drain Piping30
7 Electrical Connections & Internal Wiring32
- General32
- Customer Connections32
- Zone Circulator Wiring33
- Internal Wiring33
8 Boiler Control: Operation36
- Ignition Sequence36
- Status Display38
- User Menu41
- Installer Menu43
- Defaults55
- Multiple Boilers55
9 Start-Up Procedure59
- Check Water Piping59
- Check Electric Power59
- Check Gas Piping59
- Check Operation59
- Combustion Test59
- Test Operating Limit60
- Test High Limit61
- Multiple Boiler Systems61
- Lighting & Operating Instructions62
10 Troubleshooting63
- Errors63
- Blocking Errors63
- Locking Errors63
- Warning Errors63
- Special Ignition/Flame Failure64
- Interlocks Open64
11 Maintenance71
- General (with Boiler in Use)72
- Weekly (with Boiler in Use)72
- Annually (before the Start of Heating Season)72
- Condensate System Cleaning Instructions72
- Combusion Chamber Coil Cleaning Instructions73
12 Boiler Dimensions & Ratings75
13 Repair Parts78
Appendix A. Pixel Display Screen88
- Stand Alone Pixel Display88
- Multiple Boiler (Cascade) Pixel Display88
Appendix B. Burner Lcd Status Screens90
Appendix C. User Menu92
Appendix D. Installer Menu Structure94
Appendix E. Combustion Test Record96
Service Log97

Questions and Answers:

A
Angela PhillipsAug 1, 2025
What to do if PEERLESS PUREFIRE PF-850 shows Interlocks Open Error?
- T
  Taylor AdamsAug 1, 2025
  If the PEERLESS Boiler displays an 'Interlocks Open Error', it means an interlock connected to terminals #11 & #12 is open, or the low or high gas pressure switch is tripped. Try these steps: * If a temporary jumper between terminals #11 & #12 allows the boiler to proceed to 'Trial for Ignition', one of the external interlocks may be open. * Pressing the reset buttons on both high and low gas pressure switches may reset the error. If this doesn't work, check the incoming gas pressure.
X
Xavier RamirezAug 11, 2025
Why does my PEERLESS PUREFIRE PF-850 Boiler display a No Comm Error?
- S
  Sherry WilsonAug 11, 2025
  If your PEERLESS Boiler shows a 'No Comm. Error', it means the dependent burner isn't communicating with the managing burner. To solve this, check the Installer Menu under Burner Options on the managing burner to ensure it is set to 'managing burner'.
W
Whitney MedinaAug 21, 2025
What happens when PEERLESS PUREFIRE PF-850 Boiler displays Outdoor Sensor Error?
- L
  Linda MillerAug 21, 2025
  If the PEERLESS Boiler displays an Outdoor Sensor Error after pressing the 'Reset' key, be aware that the boiler will not operate until this problem is corrected.

PEERLESS PUREFIRE PF-850 Specifications

General

Model	PF-850
Type	Condensing Boiler
Input BTU/hr	850, 000
Fuel Type	Natural Gas or Propane
Dimensions	48.5" H x 34.5" W x 48.5" D
Weight	985 lbs
Ignition Type	Electronic

Summary

USING THIS MANUAL

INSTALLATION SEQUENCE

Outlines the proper order for installation steps.

SPECIAL ATTENTION BOXES

Explains the meaning of DANGER, WARNING, CAUTION, and NOTICE boxes.

PREINSTALLATION

CODES & REGULATIONS

Outlines installation compliance with local codes and national standards.

COMBUSTION AND VENTILATION AIR

Explains requirements for combustion and ventilation air supply.

VENTING & AIR INLET PIPING

GENERAL

General installation requirements for venting and air inlet piping.

APPROVED MATERIALS

Lists approved materials for vent and air inlet piping.

EXHAUST VENT/AIR INTAKE PIPE SIZING

WATER PIPING & CONTROLS

FUEL PIPING

FUEL LINE SIZING

GAS SUPPLY PIPING - OPERATION

Explains operational procedures for gas supply piping, including pressure checks.

CONDENSATE TRAP & DRAIN SYSTEM

CONDENSATE SYSTEM

Describes the components and function of the condensate system.

ELECTRICAL CONNECTIONS & INTERNAL WIRING

GENERAL

BOILER CONTROL: OPERATION

IGNITION SEQUENCE

Details the step-by-step process of burner ignition.

MULTIPLE BOILERS

Explains wiring and configuration for multi-boiler cascade systems.

START-UP PROCEDURE

CHECK GAS PIPING

CHECK OPERATION

Outlines checks for combustion emissions, controls, and high limits.

COMBUSTION TEST

Detailed procedure for performing combustion tests at various settings.

TEST OPERATING LIMIT

Verifies that the boiler shuts down at the operating limit.

TEST HIGH LIMIT

Checks that the burner shuts down when the high limit circuit opens.

LIGHTING & OPERATING INSTRUCTIONS

Basic steps for safely lighting and operating the boiler.

TROUBLESHOOTING

ERRORS

Explains error messages and types: Blocking, Locking, and Warning.

BLOCKING ERRORS

Details blocking errors, their codes, and corrective actions.

LOCKING ERRORS

Details locking errors, their codes, and manual reset procedures.

WARNING ERRORS

Explains sensor-related warning errors and their troubleshooting.

SPECIAL IGNITION/FLAME FAILURE

Addresses troubleshooting ignition and flame failure issues.

INTERLOCKS OPEN

Explains conditions causing "Interlocks Open" errors.

MAINTENANCE

ANNUALLY (BEFORE THE START OF HEATING SEASON)

APPENDIX C. USER MENU

APPENDIX D. INSTALLER MENU STRUCTURE

INSTALLER MENU

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