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Prime Heat PH24 - User Manual

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MODELS:
PH18
AND PH24
Natural or Propane Gas
Control Type:
Manual or Millivolt
UNVENTED GAS LOG HEATER OR
VENTED DECORATIVE APPLIANCE
Installation and Operating Instructions
READ BEFORE INSTALLING. SAVE THESE INSTRUCTIONS
This is an unvented gas- red heater.
It uses air (oxygen) from the room
in which it is installed. Provisions for
adequate combustion and ventilation
air must be provided. See page 7.
WARNINGS
If the information in this manual is not followed
exactly, a fire or explosion may result causing
property damage, personal injury or loss of life.
Do not store or use gasoline or other ammable
vapors and 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
re department.
Installation and service must be performed by
a quali ed installer, service agency or the gas
supplier.
WARNINGS

Questions and Answers

  • J
    jasonbennettAug 8, 2025
    What to do if my Prime Heat Gas Heater smells like gas when off?
    • N
      nicholas53Aug 8, 2025
      If your Prime Heat Gas Heater has a gas odor even when the control knob is in the OFF position, this typically indicates a gas leak. Locate and correct all leaks. If the odor persists, the control valve may be defective and require replacement.
  • M
    Melissa GarzaAug 14, 2025
    Why does my Prime Heat Gas Heater shut off during use?
    • S
      Spencer AllisonAug 14, 2025
      If your Prime Heat Gas Heater shuts off during use, it could be due to several reasons. First, ensure enough fresh air is available by opening a window or door for ventilation. It may be also caused by restrictions in incoming air flow, so check for a bottom riser on the glass door, a sunken fireplace, or excessive lava rock/cinders densely packed against the grate. Another potential cause is a partially clogged ODS/pilot, which would require cleaning. Also, a defective thermopile may be the reason. Check the pilot flame and wire connections, and ensure an output of 325 millivolts across the TH/TP and TP Terminals with the ON/OFF switches off. Finally, low line pressure can also cause this issue, in which case you should contact your local gas company.
  • J
    Jacob GomezAug 20, 2025
    Why won't my Prime Heat Gas Heater ignite even with a spark?
    • T
      Theresa RollinsAug 20, 2025
      If the ignitor button on your Prime Heat Gas Heater is pressed and there is spark at the ODS pilot, but no ignition occurs, there are several possible causes. First, ensure that the gas supply is turned on and the manual shutoff valve is open. Next, check that the control knob is in the PILOT position and pressed in while in that position. If there is air in the gas lines from a recent installation, continue holding down the control knob and repeat the igniting operation until the air is removed. Additionally, the ODS/pilot may be clogged, requiring replacement or servicing. Finally, the gas regulator setting might not be correct, and the gas regulator may need to be replaced.
  • T
    Tyler JonesAug 26, 2025
    How to fix a Prime Heat Gas Heater when the ignitor button produces no spark?
    • S
      Stephen KellyAug 26, 2025
      If pressing the ignitor button on your Prime Heat Gas Heater produces no spark at the ODS/pilot, several issues could be responsible. The ignitor electrode may be positioned incorrectly or broken, in either case, replace the ignitor. The ignitor electrode may not be connected to the ignitor cable, so reconnect the ignitor cable. The ignitor cable might be pinched or wet; free the ignitor cable if it is pinched by any metal or tubing. The ignitor cable may be broken, so replace the ignitor cable. Finally, the piezo ignitor itself might be bad, so replace the piezo ignitor.
  • G
    george33Sep 1, 2025
    Why does my Prime Heat Gas Heater smell?
    • J
      Jessica MclaughlinSep 1, 2025
      If your Prime Heat Gas Heater produces unwanted odors, it may be due to the appliance burning vapors from paint, hair spray, glues, or similar products. Ventilate the room and stop using these odor-causing products while the heater is running. Another potential cause is a gas leak; locate and correct all leaks. It might also be due to the initial burn-off of the unit. In this case, ventilate the room and turn the unit on high until the odor is gone, which should take about 2 to 3 hours of continuous use.

Summary

IMPORTANT SAFETY INFORMATION

General Safety Guidelines

Crucial safety warnings and precautions for installation and operation.

Carbon Monoxide Poisoning Awareness

Symptoms, causes, and prevention of carbon monoxide poisoning.

Gas Type and Leak Safety

Safe handling of propane/LP and natural gas, including leak detection.

GETTING STARTED

Verify Received Parts

Checklist for ensuring all necessary parts are present before installation.

Installation Tools and Materials

List of required tools and materials for the installation process.

PRODUCT FEATURES AND SPECIFICATIONS

Natural Gas Model Specs

Regulator pressure settings and gas rates for natural gas models.

Propane;LPG Model Specs

Regulator pressure settings and gas rates for propane/LPG models.

Ignition Control Options

Explanation of manual and millivolt control positions and operation.

Safety Pilot and Thermal Generator

Information on the ODS safety pilot and millivolt generator.

GENERAL INSTALLATION INFORMATION

Codes and Standards Compliance

Adherence to local codes and national fuel gas codes (NFPA54).

Combustion and Ventilation Air Needs

Requirements for adequate air supply in confined or tight constructions.

Defining Tight Construction

Definition of unusually tight construction for air flow requirements.

FIREPLACE AND HEARTH DIMENSIONS

Approved Fireplace Types for Installation

Specifies approved fireplace types for installation, including factory-built.

Minimum Hearth Size Requirements

Minimum hearth dimensions for PH18 and PH24 models.

PLACEMENT IN FIREPLACE WITH BARRIER

Restrictive Barrier Installation Guidelines

Guidelines for placing unit in fireplaces with barriers like glass doors.

Barrier Height vs. Fireplace Depth

Table relating barrier height to minimum fireplace depth.

CLEARANCES AND HEIGHT REQUIREMENTS

Sidewall and Ceiling Clearance Rules

Minimum clearances from combustible walls and ceiling.

FLOOR CLEARANCE REQUIREMENTS

Combustible Floor Installation

Minimum clearance above combustible flooring or use of non-combustible material.

FIREPLACE PREPARATION

Pre-Installation Unit Checks

Steps before installation, including sealing vents and cleaning.

Vented Application Installation Notes

Specific requirements for installing as a vented decorative log set.

Damper Stop Installation Procedure

Instructions for installing a damper stop for flue opening.

INSTALLING VENTED APPLIANCE

Securing the Gas Log Unit

Instructions on how to secure the unit to the fireplace floor.

Unit Assembly Steps

Step-by-step guide for installing the grate and anchoring the unit.

CONNECTING THE GAS SUPPLY

Gas Piping and Valve Requirements

Guidelines for gas piping material, sizing, shutoff valves, and pressure taps.

Verify Correct Gas Type

Importance of matching gas supply type to the heater's rating plate.

CHECKING GAS PRESSURE

Manual Control Pressure Test Method

Procedure for checking gas pressure on manual control units.

Millivolt Control Pressure Test Method

Procedure for checking gas pressure on millivolt control units.

ELECTRICAL WIRING (MILLIVOLT)

Millivolt Valve Operation

The millivolt valve is self-powered, not requiring AC power.

Connecting Optional Controls

Instructions for wiring optional wall switches, thermostats, or receivers.

LOG PLACEMENT

PH18-R Log Arrangement

Step-by-step guide for correctly placing logs on the PH18-R unit.

PH24-R Log Arrangement

Step-by-step guide for correctly placing logs on the PH24-R unit.

PH30-R Log Arrangement

Step-by-step guide for correctly placing logs on the PH30-R unit.

FLAME APPEARANCE

Checking Pilot Flame Quality

How to visually check the pilot flame for correct contact with the thermocouple.

Checking Burner Flame Quality

Expected flame appearance for the main burners at full rate.

OPERATING INSTRUCTIONS

Safety First: Read Before Lighting

Critical safety warnings to read before attempting to light the appliance.

Manual Control Lighting Procedure

Detailed steps for lighting the pilot and main burner with manual control.

Millivolt Control Lighting Procedure

Detailed steps for lighting the pilot and main burner with millivolt control.

OPERATING AND CLEANING AND SERVICING

Match Lighting Alternative

Method for lighting pilot with a match if piezo ignitor fails.

Periodic Cleaning and Maintenance

Recommended cleaning procedures for regular maintenance of logs and unit.

Annual Cleaning and Inspection

Detailed inspection and cleaning tasks for annual servicing.

TROUBLESHOOTING GUIDE

Ignitor Spark Issues

Problems with no spark at ODS/pilot when ignitor button pressed.

Unwanted Odor Causes and Fixes

Causes and remedies for unwanted odors from the appliance.

Appliance Shutdown Troubleshooting

Reasons for appliance shutdown and troubleshooting steps.

Gas Leak Detection and Resolution

Procedures for identifying and resolving gas leaks.

Pilot and Burner Ignition Problems

Issues with pilot or burner not lighting or going out.

Burner Backfire and Smoke Issues

Troubleshooting for backfiring, smoke, or odor during combustion.

Noise and Gas Supply Problems

Addressing whistling noises and lack of gas supply to the pilot.

ILLUSTRATED PARTS BREAKDOWN

Main Unit Component Identification

Diagram showing numbered components of the gas log heater assembly.

REPLACEMENT PARTS LIST

Parts for PH18 and PH24;30 Models

Comprehensive list of replacement parts for different models and fuel types.

Available Optional Accessories

List of optional accessories like remote controls and wall switches.

LOG SET ILLUSTRATED PARTS BREAKDOWN

PH18-R Log Set Diagram

Illustrated breakdown of log set components for the PH18-R model.

PH24-R Log Set Diagram

Illustrated breakdown of log set components for the PH24-R model.

PH30-R Log Set Diagram

Illustrated breakdown of log set components for the PH30-R model.

MASSACHUSETTS RESIDENTS SPECIAL REQUIREMENTS

General Massachusetts Regulations

Overview of special regulations for Massachusetts residents.

Vented Product Massachusetts Rules

Massachusetts regulations for vented gas products.

Vent-Free Product Massachusetts Rules

Massachusetts regulations for vent-free gas products.

CO Detector Mandates for MA

Mandated carbon monoxide detector installation and compliance in MA.

WARRANTY INFORMATION

Lifetime and 5-Year Warranties

Warranty coverage for chassis, grate, and refractory logs.

Basic 2-Year Component Warranty

Warranty for manufacturing/material defects on other components.

Warranty Voidance Conditions

Circumstances that will void the limited lifetime warranty.

Prime Heat PH24 Specifications

General IconGeneral
BrandPrime Heat
ModelPH24
CategoryGas Heater
LanguageEnglish

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