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Unvented Gas Log Heater or
Vented Decorative Appliance
Installation and Operating Instructions
This appliance may be installed
in an aftermarket, permanently
located, manufactured (mobile)
home, where not prohibited by
local codes.
This appliance is only for use
with the type of gas indicated on
the rating plate. This appliance is
not convertible for use with other
gases.
This is an unvented gas-fired heater.
It uses air (oxygen) from the room
in which it is installed. Provisions
for adequate combustion and
ventilation air must be provided.
Refer to page 7.
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.
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–
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READ AND SAVE THESE INSTRUCTIONS
MODELS: MJ27NR, MJ27PR
Natural Gas or Liquid Propane
Control Type: Millivolt Hi/Low
WARNINGS
Do not store or use gasoline or other flammable
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 fire
department.
Installation and service must be performed by
a qualified installer, service agency or the gas
supplier.
860024
MJ27 cover
10/08
86D0024 10/08 Rev. 1
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Table of Contents
Related Manuals for Monessen Hearth MJ27NR
Summary of Contents for Monessen Hearth MJ27NR
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Page 1: Installation And Operating Instructions
Provisions for adequate combustion and ventilation air must be provided. Refer to page 7. READ AND SAVE THESE INSTRUCTIONS 860024 MODELS: MJ27NR, MJ27PR MJ27 cover Natural Gas or Liquid Propane 10/08 Control Type: Millivolt Hi/Low WARNINGS... -
Page 2: Table Of Contents
CONTENTS Important Safety Information ... 3 Getting Started ...5 Product Features and Specifications ... 6 Natural Gas ...6 Propane/LPG ...6 Ignition Controls ...6 Pilot/ODS ...6 Thermal Generator ...6 General Installation Information ... 7 Codes ...7 Adequate Combustion and Ventilation Air ... 7 Fireplace and Hearth Dimensions ... -
Page 3: Important Safety Information
INSTALLER Please leave these instructions with the appliance. Read these instructions carefully before installing or trying to operate this vent-free gas heater. • Any change to this heater or its controls can be dangerous. • Improper installation or use of the heater can cause serious injury or death from fire, burns, explosion or carbon monoxide poisoning. - Page 4 IMPORTANT SAFETY INFORMATION continued from page 3 15. This is an unvented gas-fired heater. It uses air (oxygen) from the room in which it is installed. Pro- visions for adequate combustion and ventilation air must be provided. See page 8. 16. Keep room area clear and free from combustible materials, gasoline and other flammable vapors and liquids.
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Page 5: Getting Started
MAkE SuRE YOu hAvE RECEIvED ALL PARTS: Check your packing list to verify that all listed parts have been received. You should have the following: • Unvented Gas Log Burner Assembly • Installation/Operating Instructions • Ceramic Fiber Logs • FAI135 Andiron Kit •... -
Page 6: Product Features And Specifications
THERMAL GENERATOR The millivolt gas log pilot is fitted with a Millivolt (thermopile) generator to provide power for remote activation. 3.5" w.c. 3.5" w.c. Model Number MJ27NR Max 10 " w.c. Min. 5" w.c. 10" w.c Model Number Max. 13" w.c. -
Page 7: General Installation Information
CODES Adhere to all local codes or, in their absence, the latest edition of THE NATIONAL FUEL GAS CODE ANSI Z223.1 or NFPA54 which can be obtained from… American National Standards Institute, Inc. National Fire Protection Association, Inc. ADEQUATE COMBUSTION AND VENTILATION AIR This heater shall not be installed in a confined space or unusually tight construction unless provi- sions are provided for adequate combustion and ventilation air. - Page 8 GENERAL INSTALLATION INFORMATION Figure 1 - Example of a Large Room with 1/2 Wall Divider The following formula can be used to determine the maximum heater rating per the definition of unconfined space: (L1 + L2) Ft x (W) Ft x (H) Ft. hr = Consider two connecting rooms with an open area between, with the following dimensions: = 15...
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Page 9: Fireplace And Hearth Dimensions
This appliance is for installation only in a solid-fuel burning masonry or uL127 factory-built fireplace, vent free appliance, or in listed ventless firebox enclosure. It has been design certified for these installations. Exception: DO NOT install this appliance in a factory-built fireplace that includes instructions stating it has not been tested or should not be used with unvented gas logs. -
Page 10: Placement In A Fireplace With A Restrictive Barrier
PLACEMENT IN A FIREPLACE wITh A RESTRICTIvE BARRIER IMPORTANT INFORMATION FOR ThE INSTALLATION OF ThIS GAS LOG SET The following are guidelines for placing a gas log set in a fireplace that has a restrictive barrier along the bottom front opening of the fireplace. Some examples of barriers are glass/screen door frames and sunken/recessed fireplaces. -
Page 11: Clearances And Height Requirements
The dimensions shown in Figures 4 through 11 and defined in the fireplace manufacturer's instructions are minimum clearances to maintain when installing this heater. Left and right clearances are determined when facing the front of the heater. when heater is installed into a ventless firebox, minimum clearances, as specified by the ventless firebox manufacturer, must be met. -
Page 12: Clearances And Height Requirements
CLEARANCES and HEIGHT REQUIREMENTS Heat resistant material (minimum requirements) with no wooden mantel or other combustible projection: To install the gas logs into a fireplace with no wooden mantel, shelf or other combustible projection above the fireplace opening, measure the heat resistant material height, per Figure 5, then see TABLE A. Heat resistant materials such as slate and marble must be at least 1/2”... - Page 13 Heat resistant material (minimum requirements) with wooden mantel or other combustible projection: To install the heater with a wooden mantel, shelf or other combustible projection above, first measure the heat resistant material shown in Figure 6, then refer to Table B. Figure 6 - Measuring Heat Resistant Material for Mantel Heat Resistant Material Measurement...
- Page 14 CLEARANCES and HEIGHT REQUIREMENTS 12" 10" 8" 6" Heat 1 /2 Resistant " Material 8" 14 Hood Heater in Fireplace or Firebox FP1999 Figure 7 - Minimum Mantel Clearance with Hood - All Models FP1999 min. mantel clearance Heat Resis- tant Material FP2001 Figure 8 - Minimum Mantel Clearance with No Hood —...
- Page 15 7" 6" Mantel Minimum of 8" Heat Resistant 4" Material FP2002 Hood Figure 9 - Minimum Mantel Clearance with Hood - MJ27 FP2002 mantel clearances unsafe 86D0024 CLEARANCES and HEIGHT REQUIREMENTS Figure 9 is an example of an unsafe mantel instal- lation.
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Page 16: Floor Clearance
FLOOR CLEARANCE The gas log heater must be installed at least 1 tile, which is closer than 14" to the base of the fireplace. The minimum distance must be maintained from the top surface of carpeting, tile, etc. Figure 10 The gas log heater may be installed nearer to the floor if a minimum of 14" of noncombustible material such as slate or marble is installed between the base of the fireplace and the combustible flooring. -
Page 17: Fireplace Preparation
BEFORE FULLY INSTALLING THE UNIT: • Turn OFF the gas supply to the fireplace or firebox. • Seal any fresh air vents and/or ash clean-out doors located on the floor or wall of the fireplace. If left unsealed, drafting may cause pilot outage or sooting. Use a heat resistant sealant. Do not seal the chimney flue damper. -
Page 18: Installing Vented Applications
INSTALLING vENTED APPLICATIONS PLACING AND SECuRING APPLIANCE You must secure the gas log heater to the fireplace floor. If not, the entire unit may move when you adjust the controls. Movement of unit may cause shifting of the gas logs which leads to sooting and improper burning. -
Page 19: Connecting The Gas
NOTICE: A qualified gas appliance installer must connect the heater to the gas supply. Consult all local codes. use new black iron or steel pipe. Internally tinned copper or copper tubing can be used per National Fuel Code, section 2.6.3, providing gas meets hydrogen sulfide limits, and where permitted by local codes. -
Page 20: Checking Gas Pressure
ChECkING GAS PRESSuRE Connecting directly to an unregulated propane/LPG tank can cause an explosion. Test all gas joints from the gas meter to the heater valve for leaks using a gas analyzer or soap and water solu- tion after completing connection. DO NOT uSE AN OPEN FLAME. Check the gas pressure with the appliance burning and the control set to HIGH. -
Page 21: Electrical Wiring (Millivolt)
The Millivolt valve is a self-powered combination gas control ThAT DOES NOT REquIRE 110 vAC TO OPER- ATE. Label all wires prior to disconnection when servicing controls. wiring errors can cause improper and dangerous operation. verify proper operation after servicing. Motor TH = 3 TP = 1... -
Page 22: Connecting Remote Receiver
ELECTRICAL WIRING (MILLIVOLT) CONNECTING REMOTE RECEIVER 1. Set remote receiver. See instructions included in receiver kit. 2. Connect the two (2) 1/4" female connectors to the TP/TH and TH terminals on the control valve. 3. Connect the four-pin connector from the valve motor to the four-pin con- nector on the receiver. -
Page 23: Log Placement
Before you begin — This unit is supplied with seven (7) ceramic fiber logs. Do not handle these logs with your bare hands. Always wear gloves to prevent skin irritation from ceramic fibers. After handling the logs, wash your hands gently with soap and water to remove any traces of fibers. The positioning of the logs is critical to the safe and clean operation of this heater. - Page 24 LOG PLACEMENT LG553 2. Place log #1 by setting the log over the MJ127 log 8 rear bracket over the two pins. Figure 10/08 LG555 4. Place log #3 at an angle over log #2 MJ127 Log #2 toward the back by matching the rectan- gular notch on the bottom of this log with 10/08 the rectangular protrusion on log #2.
- Page 25 5. Place Log #4 by matching the rect- angular protrusion on the bottom of this log over the rectangular notch on log #3. Swing the log slightly to the front and set the log over the notch located on the upper surface of log #3.
- Page 26 LOG PLACEMENT LG549 LG549 MLDV log #7 PLACE FLICkERING EMBERS Place flickering bright embers (FBE-1G) after placing logs on burner. Pull apart into small strands and place on top of existing rock wool in front of and between front logs where they can be seen.
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Page 27: Ember And Rock Installation
ANDIRON INSTALLATION 2, Andirons 2, Brackets 2, 2 Bolts Assembly Instructions 1. Affix bracket to andiron using 2 2. The andiron bracket clips over the lower horizontal grate bar. Figure 30 3. The left andiron goes to the left of the large knot on the front left log. The right andiron will adjust left to right to center equally in fireplace. -
Page 28: Flame Appearance
FLAME APPEARANCE Flames from the pilot and burner should be visually checked as soon as the heater is installed. In addition, periodically check the flames visually during operation. ChECkING ThE PILOT FLAME The pilot flame must always be present when the heater is in operation. It should just touch the top of the thermocouple tip for natural. -
Page 29: Checking The Burner Flame
In normal operation at full rate after 15 minutes, the following flame appearances should be observed: Burner will have a random pattern of yellow flames as shown in Figure 33. There should be glow- ing embers on the front burner. Note: The front flames and embers will be an opaque orange color during the burn off time. -
Page 30: Operating Instructions
OPERATING INSTRuCTIONS FOR YOUR SAFETY READ BEFORE LIGHTING A. This appliance is equipped with a piezo ignition device which lights the pilot. If piezo is not working properly see Match lighting instructions, Page 32. B. BEFORE OPERATING smell all around the appliance area for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor. -
Page 31: Millivolt Control Lighting Instructions
Millivolt CONTROL LIGHTING INSTRUCTIONS 1. STOP! Read the safety information label. 2. Make sure the manual shutoff valve is fully open. 3. This gas log set is equipped with an ignition device (piezo) which automatically lights the pilot. If piezo ignitor does not light the pilot, refer to instructions for Match lighting instructions, Page 30. -
Page 32: Match Lighting Instructions
OPERATING INSTRuCTIONS / CLEANING and SERVICING MATCH LIGHTING INSTRUCTIONS 1. Remove any items necessary for easy access to the pilot (for example: logs, screens, etc.). 2. Follow appropriate lighting instructions found previously. Instead of pushing and releasing the piezo button, light a match and hold the flame to the end of the pilot and ignite the pilot. 3. -
Page 33: Troubleshooting
Note: All troubleshooting items are listed in order of operation. OBSERvED PROBLEM POSSIBLE CAuSE When ignitor button is 1. Ignitor electrode positioned wrong. pressed, there is no spark at ODS/pilot. 2. Ignitor electrode is broken. 3. Ignitor electrode not connected to ignitor cable. - Page 34 TROUBLESHOOTING If the gas quality is bad, your pilot may not stay lit, the burners may produce soot and the heater may backfire when lit. If the gas quality or pressure is low, contact your local gas supplier immediately. OBSERvED PROBLEM POSSIBLE CAuSE ODS/pilot lights, but flame 1.
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Page 35: Replacement Parts
Failure to position the parts in accordance with these diagrams or failure to use only parts specifically approved with this appliance may result in property damage or personal injury. qty. 0024 MJ parts REPLACEMENT PARTS MJ27NR MJ27PR Natural Propane 86D0017 86D0018 20H2081 20H2082 14D0473 14D0473... -
Page 36: Replacement Parts List
REPLACEMENT PARTS LIST LOGS Item REPLACEMENT PARTS ARE AVAILABLE THROUGH YOUR RETAILER. Description qty. 1. Log #1 2. Log #2 3. Log #3 4. Log #4 5. Log #5 6. Log #6 7. Log #7 8. Log #8 Failure to position the parts in accordance with these diagrams or failure to use only parts specifically approved with this appliance may... -
Page 37: Massachusetts Residents Only
MASSAChUSETTS RESIDENTS ONly: PlEASE READ AND FOllOW ThESE SPECIAl REQUIREMENTS NOTE REGARDING VENTED PRODUCTS This product must be installed by a licensed plumber or gas fitter when installed within the Commonwealth of Massachu- setts. Any residence with a direct vent product must have a CO detector installed in the residence. Installation of the fireplace or vented gas log in the State of Massachusetts requires the damper to be permanently removed or welded in the fully open position. - Page 38 NOTES 86D0024...
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Page 39: Limited Lifetime Warranty Policy
Vent Free Ceramic Fiber Logs and Aluminized Burners. BASIC WARRANTY Monessen Hearth Systems (MHS) warrants the components and materials in your gas appliance to be free from manufacturing and material defects for a period of two years from date of installation. After... - Page 40 MHSC 149 Cleveland Drive • Paris, Kentucky 40361 www.mhsc.com OCTOBER 2008 86D0024 • Rev. 1...
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