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Monessen Hearth GG18NV - User Manual

Monessen Hearth GG18NV
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Monessen • Hi/Lo Variable Flame Height Kit/Remote Control Instructions • 4606-901 Rev. B • 06/18
This kit must be installed by a qualied
service agency.
Hi/Lo Variable Flame Height Kit and Remote
Control Instructions
Models: GG18NV, GG18PV, GG24NV, GG24PV, NB18NV,
NB18PV, NB24NV, NB24PV
Kit Contents:
- Hi/Lo SIT Stepper Motor (820 NG-3.5 for Natural Gas,
820 LP-10 for Liquid Propane).
- Pro-Flame Receiver Kit.
- Pro-Flame Transmitter (Remote).
- Pro-Flame Wire Harnesses.
- Installation Instruction.
Tools Required:
- Gloves.
- Torx T20 Safety Driver.
- Small Flathead Screwdriver.
Check to make sure that all parts have been received
and are correct. If not, contact your dealer before
beginning installation.
CAUTION
Before installing kit:
Shut off gas supply
Allow unit to cool
This Hi/Lo kit shall be installed by a qualied service
agency in accordance with manufacture’s instructions.
If all information in these instructions is not followed
exactly, a fire, explosion or production of carbon
monoxide may result causing property damage, personal
injury or loss of life.
The qualied service agency is responsible for the proper
installation of this kit. The installation is not complete
until operation of the appliance is checked as specied
in the manufacturer’s instructions supplied with the kit.
LOGS MAY BE HOT TO THE TOUCH. HANDLE
THE LOGS WITH GLOVES AND PLACE THEM ON
A NONCOMBUSIBLE SURFACE WHEN THEY HAVE
BEEN REMOVED FROM THE UNIT.
WARNING
1. Remove the logs from the unit and set aside.
2. Using a Torx T20 driver, remove and discard the
regulator and rubber gasket in the face of the valve.
Refer to regulator instructions provided with the Hi/Lo
stepper motor included in your kit .
3. Using a Torx T20 driver, Install the Hi/Lo stepper motor
with rubber gasket from Hi/Lo kit. Make sure the gasket
is sealed properly.
4. Disconnect the two (2) female connectors for the log
switch from the TP/TH and TH terminals on the control
valve.
5. Connect the 14-pin female connector from the wire
harness provided with your kit to the 14-pin male
connector on the back of the receiver that is also
provided with your kit.

Questions and Answers

  • E
    ewilliamsAug 16, 2025
    Why does my Monessen Hearth GG18NV smell like gas even when it's off?
    • R
      Randall MelendezAug 16, 2025
      If you smell gas even when the control knob of your Monessen Hearth Indoor Fireplace is in the OFF position, it could be due to a gas leak. You should locate and correct all leaks. Another potential cause is a defective control valve, which would require replacement.
  • D
    Danielle HarveyAug 19, 2025
    What to do if my Monessen Hearth Indoor Fireplace sparks but doesn't ignite?
    • L
      Lindsey SweeneyAug 19, 2025
      If your Monessen Hearth Indoor Fireplace shows a spark at the ODS pilot when the ignitor button is pressed, but there's no ignition, make sure the gas supply is turned on and the manual shutoff valve is open. Also, check that the control knob is in the PILOT position and pressed in. If there's air in the gas lines from a recent installation, keep holding down the control knob and repeat the ignition process to remove the air. The ODS/pilot may be clogged, in which case it should be replaced or serviced. Finally, verify that the gas regulator setting is correct, checking the incoming pressure and replacing the regulator if needed.
  • C
    Carrie BrownAug 22, 2025
    Why does my Monessen Hearth GG18NV have a strange smell?
    • M
      Molly WardAug 22, 2025
      Unwanted odors from your Monessen Hearth Indoor Fireplace can be caused by several factors. The appliance might be burning vapors from paint, hair spray, glues, or other similar products. In this case, ventilate the room and avoid using these products while the heater is running. A gas leak can also cause odors, so locate and correct any leaks. If the unit is new, the odor may be due to the initial burn off. Ventilate the room and run the unit on high until the odor disappears, typically after about six hours of continuous use.
  • M
    Michelle BryantAug 26, 2025
    Why does my Monessen Hearth GG18NV Indoor Fireplace keep shutting off?
    • P
      Philip Mcknight PhDAug 26, 2025
      If your Monessen Hearth Indoor Fireplace shuts off during use, it could be due to several reasons. Ensure enough fresh air is available for the ODS/pilot to operate by opening a window or door. Low line pressure can also cause this issue, so contact your local gas company. The ODS/pilot might be partially clogged and need cleaning. A defective thermopile could be the problem; check the wire connections and ensure the output is 500 millivolts across the TH/TP and TP terminals with the ON/OFF switches off. Lastly, check for any restrictions in incoming airflow, such as a bottom riser on the glass door, a sunken fireplace, or excessive lava rock/cinders densely packed against the grate.
  • G
    Gregory BenderAug 28, 2025
    How to fix a Monessen Hearth GG18NV ignitor that won't spark?
    • M
      Matthew HernandezAug 29, 2025
      If there's no spark at the ODS/pilot when you press the ignitor button on your Monessen Hearth Indoor Fireplace, it could be due to several reasons. The ignitor electrode might be positioned incorrectly or broken, in which case you should replace it. Check if the ignitor electrode is disconnected from the ignitor cable and reconnect it if necessary. The ignitor cable could be pinched or wet; free it if pinched or allow it to dry. If the ignitor cable is broken, replace it. A bad piezo ignitor can also cause this issue, so replace it if needed.
  • A
    Anna MarshallAug 31, 2025
    What to do if my Monessen Hearth GG18NV Indoor Fireplace pilot won't light, makes noise, but no spark?
    • A
      Andrea DunnAug 31, 2025
      If the ignitor/module makes noise but there's no spark when trying to light the pilot on your Monessen Hearth Indoor Fireplace, check the wiring. Ensure the "S" wire (white) for the sensor and the "I" wire (orange) for the ignitor are connected to the correct terminals on the module and pilot assembly. Also, verify there are no loose connections or electrical shorts in the wiring from the module to the pilot assembly. Finally, check that the ignitor gap is not too large relative to the thermocouple or pilot barrel.
  • J
    jared19Sep 3, 2025
    Why does the pilot spark on my Monessen Hearth GG18NV Indoor Fireplace but not light?
    • S
      Sandra OlsonSep 4, 2025
      If the pilot sparks but doesn't light on your Monessen Hearth Indoor Fireplace, first, confirm that the gas supply is on and has adequate pressure. Next, check the ignitor gap to ensure it's properly aligned with the thermocouple or pilot barrel. Verify that the module is securely grounded to the metal chassis of the appliance. Finally, confirm that the pilot valve solenoid voltage is within the specified range of 1.5 to 1.8 VDC supplied to the pilot solenoid from the module.
  • T
    tyleradamsSep 6, 2025
    Why does my Monessen Hearth Indoor Fireplace pilot light but continue to spark, and the main burner won't ignite?
    • R
      rnealSep 7, 2025
      If the pilot light on your Monessen Hearth Indoor Fireplace sparks continuously, but the main burner won't ignite, verify all connections to the wiring diagram in the manual to ensure there are no shorted or loose connections from the thermocouple or thermocouple module. Ensure that the correct pilot orifice is installed and the gas inlet is set to the pressure specifications to avoid poor flame rectification or a contaminated flame sensing rod. Also, make sure the module is securely grounded to the metal chassis of the appliance. Check the connection from the thermocouple to the thermocouple module and inspect the thermocouple for contaminants. If the pilot assembly is damaged or the thermocouple is contaminated, it may cause the issue.
  • S
    Sarah RodriguezSep 9, 2025
    Why won't the pilot light on my Monessen Hearth GG18NV, with no noise or spark?
    • J
      James JohnsonSep 9, 2025
      If the pilot won’t light and there's no noise or spark on your Monessen Hearth Indoor Fireplace, begin by checking the batteries. Ensure the battery power supply voltage is at least 4.9 volts; if it's less, replace the batteries, making sure they are installed correctly. Next, check for a shorted or loose connection in the wiring configuration or wiring harness; try removing and reinstalling the wiring harness that plugs into the module. Confirm that 110-120 VAC power is "ON" to the junction box, which is related to improper wall switch wiring. Finally, verify that the black ground wire from the module wire harness is grounded to the metal chassis of the appliance, as the module may not be grounded.
  • S
    shawna53Sep 12, 2025
    Why does my Monessen Hearth Indoor Fireplace have shortened battery life?
    • J
      johnoliverSep 12, 2025
      Shortened battery life in your Monessen Hearth Indoor Fireplace could be due to a couple of reasons. First, verify that the white and red wires from the thermopile are in the correct location on the control module, as thermopile wires hooked up backwards can cause this. If you are using the flame adjustment feature frequently on the RC300, reduce the number of times flame height is adjusted to increase battery life.

Overview

This document provides installation instructions for the Monessen Hi/Lo Variable Flame Height Kit and Remote Control, designed for various Monessen fireplace models including GG18NV, GG18PV, GG24NV, GG24PV, NB18NV, NB18PV, NB24NV, and NB24PV. This kit enhances the functionality of your fireplace by allowing remote control over the flame height, offering greater convenience and ambiance customization.

Function Description

The Monessen Hi/Lo Variable Flame Height Kit integrates a stepper motor and a remote control system into your existing fireplace valve, enabling precise adjustment of the flame height. Traditionally, fireplace flame height might be manually adjusted or fixed. This kit upgrades the system to allow for variable flame height control via a handheld remote, providing a more dynamic and user-friendly experience.

At its core, the kit consists of a Hi/Lo SIT Stepper Motor, which is the mechanical component responsible for modulating the gas flow to the burner, thereby controlling the flame height. This motor is specifically designed for either Natural Gas (NG) or Liquid Propane (LP) applications, with distinct models (820 NG-3.5 and 820 LP-10) to ensure compatibility and proper operation with your fuel type. The stepper motor replaces the existing regulator on the valve, integrating directly into the gas control system.

The remote control aspect is managed by a Pro-Flame Receiver Kit and a Pro-Flame Transmitter (the handheld remote). The receiver connects to the fireplace's control valve and the stepper motor via a series of wire harnesses. It acts as the intermediary, receiving signals from the transmitter and translating them into commands for the stepper motor. The transmitter, or remote, is the user interface, allowing you to wirelessly send commands to the receiver to adjust the flame height. This wireless communication eliminates the need for manual adjustments at the fireplace itself, offering convenience from a distance.

The system is designed to be integrated seamlessly with the existing gas valve. The installation process involves removing the current regulator and replacing it with the Hi/Lo stepper motor, ensuring a proper seal with a rubber gasket. Electrical connections are then made to link the stepper motor, the control valve, and the receiver using the provided wire harnesses. Once installed and properly synchronized, the system allows for remote adjustment of the flame height, providing a more sophisticated and flexible fireplace operation.

Usage Features

The primary usage feature of this kit is the ability to remotely control the flame height of your Monessen fireplace. This means you can adjust the intensity and visual appeal of your fire from the comfort of your couch, without having to get up and interact directly with the fireplace controls.

To begin using the system, you'll first need to install batteries in both the remote transmitter and the receiver. Once powered, the receiver has a three-position slider switch that needs to be set to the "Remote" position to enable wireless control. A crucial step in setting up the system is synchronizing the remote transmitter with the receiver. This is achieved by pressing a "PRG" (program) button on the receiver, which typically results in audible beeps for confirmation, followed by pressing the "ON" button on the remote. This pairing process ensures that your remote specifically controls your fireplace, preventing interference from other devices.

Once synchronized, the remote transmitter provides intuitive control over the flame height. While the specific buttons for flame adjustment are not detailed in this document, a typical Pro-Flame remote would include buttons to increase or decrease the flame height, offering a range of settings from a low, gentle flicker to a high, robust blaze. This variability allows you to tailor the ambiance of your room to your preference, whether you desire a subtle background glow or a more prominent, heat-generating fire.

The remote control functionality also extends to turning the fireplace on and off, providing a complete wireless control solution for your fireplace. This enhances safety by allowing you to operate the fireplace from a safe distance and adds a layer of modern convenience to your home heating and decorative appliance. The system is designed to be user-friendly, with clear audible feedback (beeps) during the synchronization process to guide you through setup.

Maintenance Features

While the document primarily focuses on installation, several aspects relate to the ongoing maintenance and care of the system to ensure its longevity and safe operation.

A critical maintenance feature is the requirement for installation by a qualified service agency. This is not just a recommendation but a safety imperative. Professional installation ensures that all components are correctly fitted, electrical connections are secure, and the gas system is properly sealed and tested. Incorrect installation can lead to serious hazards such as fire, explosion, or carbon monoxide production, resulting in property damage, personal injury, or loss of life. Therefore, entrusting the initial setup to a professional is the first and most important step in ensuring long-term, safe operation.

After installation, the document emphasizes checking for gas leaks. This is performed by turning on the gas supply and using a soapy water solution on all connections. The appearance of bubbles indicates a leak, which must be addressed immediately by a qualified technician. This leak check is a standard safety procedure for any gas appliance installation or modification and is crucial for preventing dangerous gas leaks.

Another important check involves verifying the manifold pressure. Using a small flathead screwdriver and a manometer, the installer must confirm that the manifold pressure meets the specified values: 3.5" for Natural Gas (NG) and 10" for Liquid Propane (LP). Correct manifold pressure is vital for the efficient and safe combustion of gas, ensuring that the flames are stable, properly sized, and that the appliance operates within its design parameters. Incorrect pressure can lead to poor performance, incomplete combustion, and potential safety issues.

The document also highlights the importance of handling logs with care. Before installation, the logs must be removed from the unit and set aside. When handling logs, especially if the unit has been in operation, it's recommended to wear gloves as they may be hot to the touch. Logs should be placed on a non-combustible surface to prevent damage or fire. Proper reinstallation of the logs, following the instructions in your fireplace's installation/use and care manual, is also essential for both aesthetic appeal and correct airflow within the firebox, which impacts combustion efficiency.

Battery replacement for both the remote transmitter and the receiver will be a routine maintenance task, although the frequency is not specified. When replacing batteries, it's important to use the correct type and size as recommended by the manufacturer to ensure proper functioning of the remote control system.

Finally, the document includes a general warning that logs may be hot to the touch and advises handling them with gloves and placing them on a non-combustible surface when removed from the unit. This serves as a constant reminder for user safety during any interaction with the fireplace's internal components, whether for maintenance or other reasons. Adhering to all instructions and warnings provided in this manual and the fireplace's main manual is key to maintaining the device safely and effectively.

Monessen Hearth GG18NV Specifications

General IconGeneral
Fuel TypeNatural Gas
Vent TypeDirect Vent
BTU Output18, 000 BTU
EfficiencyUp to 75%
Log MaterialCeramic Fiber
Ignition TypeElectronic

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