MHSC MJ27NR Installation And Operating Instructions Manual
Unvented gas log heater
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Unvented Gas Log Heater
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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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 2/09 Rev. 3
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Table of Contents
Related Manuals for MHSC MJ27NR
Summary of Contents for MHSC MJ27NR
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Page 1: Installation And Operating Instructions
Unvented Gas Log Heater Installation and Operating Instructions 860024 MODELS: MJ27NR, MJ27PR MJ27 cover Natural Gas or Liquid Propane 10/08 Control Type: Millivolt Hi/Low WARNINGS This appliance may be installed in an aftermarket, permanently If the information in this manual is not followed exactly,... -
Page 2: Table Of Contents
CONTENTS Checking System Operation ......22 Important Safety Information ........3 Log Placement ............23 Getting Started ............5 Ember and Rock Installation .........27 Product Features and Specifications ....6 Andiron Installation ..........27 Natural Gas ............6 Flame Appearance ..........28 Propane/LPG ............6 Ignition Controls ...........6 Checking Burner Flames ........29 Pilot/ODS .............6 Operating Instructions ...........30... -
Page 3: Important Safety Information
IMPORTANT SAFETY INFORMATION INSTALLER OWNER Please leave these instructions with the appliance. Please retain these instructions for future reference. IMPORTANT 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. •... - Page 4 IMPORTANT SAFETY INFORMATION continued from page 3 16. Keep room area clear and free from combustible 24. This appliance must not be used with glass doors materials, gasoline and other flammable vapors and in the closed position. This can lead to pilot outages liquids.
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Page 5: Getting Started
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 • Two (2) Plastic Bags Containing Crushed Volcanic Rock •... -
Page 6: Product Features And Specifications
" W.C. on natural gas systems operating at higher pressure. MILLIVOLT Regulator Pressure Setting: 3.5" w.c. Gas Rate Pilot Regulator: 3.5" w.c. Model Number Control Max. BTU/hr Min. BTU/hr MJ27NR Millivolt 38,000 25,500 Gas Inlet Pressure: Max 10 " w.c. Min. 5" w.c. PROPANE/LPG Note: An external regulator is required to reduce supply pressure to a maximum of 13"... -
Page 7: General Installation Information
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. 1430 Broadway New York, NY 10018 National Fire Protection Association, Inc. - Page 8 GENERAL INSTALLATION INFORMATION Counter Fireplace Figure 1 - Example of a Large Room with 1/2 Wall Divider FP2000 log clearances 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. x 1000 hr = Consider two connecting rooms with an open area between, with the following dimensions:...
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Page 9: Fireplace And Hearth Dimensions
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
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 CLEARANCES and HEIGHT REQUIREMENTS 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. 8"...
- Page 14 CLEARANCES and HEIGHT REQUIREMENTS 12" 10" 8" 6" Heat 1 /2 " Resistant Material 8" 14 "18 " 22 " 26" 1 /2 5 /8 1 /2 Example: A mantel may project from the wall a maxi- mum of 2 "...
- Page 15 CLEARANCES and HEIGHT REQUIREMENTS 7" 6" Figure 9 is an example of an unsafe mantel instal- lation. This mantel projects 4" at 8" above the opening, exceeding the maximum acceptable distance of 2 " Mantel The mantel also projects 7" at 14 "...
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Page 16: Floor Clearance
FLOOR CLEARANCE The gas log heater must be installed at least 1 " above any combustible flooring material, such as carpeting or 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. -
Page 17: Fireplace Preparation
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. - Page 18 FIREPLACE PREPARATION ASSEMBLY PROCEDURE: 1. Center the gas log unit on the fireplace or firebox. Make certain the front of the burner sits inside the front edge of the fireplace or firebox. 2. Anchor holes are located on the right and left sides of the unit. After centering the burner cor- rectly, mark the hole positions on the fireplace/firebox floor.
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Page 19: Connecting The Gas
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 The heater gas inlet connection is a 3/8" NPT at the valve. On all control type units, the inlet connection is on the right Connecting directly to an side of unit. To connect from the opposite side, route the pipe unregulated propane/LPG tank around the back portion of the unit. -
Page 21: Electrical Wiring (Millivolt)
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. ODS Pilot Motor Millivolt... -
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 Remote Wire motor to the four-pin con- Connectors... -
Page 23: Log Placement
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. - Page 24 LOG PLACEMENT Log #8 1. Place log #8 on right bracket next to valve by sliding grooves on sides of log into cutout on brackets. Figure Figure 20 - Install Log #8 LG553 Log #1 LG553 2. Place log #1 by setting the log over the MJ127 log 8 rear bracket over the two pins.
- Page 25 LOG PLACEMENT 5. Place Log #4 by matching the rect- Log #4 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 8. Place log #7 between the second and third right tong on the grate as shown in Figure 27. Figure 27 - Place Log #7 LG549 Log #7 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 and ROCk INSTALLATION ANDIRON INSTALLATION 2, Andirons 2, Brackets 2, 2 Bolts Assembly Instructions 1. Affix bracket to andiron using 2 bolts. Figure 29 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 Burner Flames
CHECkING THE BURNER FLAME In normal operation at full rate after 15 minutes, the following flame appearances should be observed: LG551 Figure 33 - Correct Burner Flame Appearance Burner will have a random pattern of yellow flames as shown in Figure 33. There should be glow- LG551 ing embers on the front burner. -
Page 30: Operating Instructions
OPERATING INSTRUCTIONS FOR YOUR SAFETY READ BEFORE LIGHTING If you do not follow these instruction exactly, a fire or explosion may result causing property damage, personal injury or loss of life. 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. -
Page 31: Millivolt Control Lighting Instructions
OPERATING 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
TROUBLESHOOTING Turn appliance OFF and allow to cool before servicing. Only a qualified service person should service and repair the heater. Note: All troubleshooting items are listed in order of operation. OBSERVED PROBLEM POSSIBLE CAUSE REMEDY When ignitor button is 1. - 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 REMEDY ODS/pilot lights, but flame 1.
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Page 35: Replacement Parts
BURNER ASSEMBLY 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. BURNER ASSEMBLY MJ27NR MJ27PR Item Description Qty. Natural Propane 0024 1. -
Page 36: Logs
REPLACEMENT PARTS LIST LOGS Item Description Qty. MJ27 1. Log #1 75D0536 2. Log #2 75D0537 3. Log #3 75D0538 4. Log #4 75D0539 5. Log #5 75D0540 6. Log #6 75D0541 7. Log #7 75D0542 8. Log #8 86D0019 Failure to position the parts in accordance with these diagrams or failure to use only parts specifically... - Page 37 NOTES 86D0024...
- Page 38 NOTES 86D0024...
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Page 39: Warranty
IF WARRANTY SERVICE IS NEEDED... 1. Contact your supplier. Make sure you have your warranty, your sales receipt and the model/serial number of your MHSC product. 2. DO NOT ATTEMPT TO DO ANY SERVICE WORK YOURSELF. - Page 40 MHSC 149 Cleveland Drive • Paris, Kentucky 40361 www.mhsc.com FEBRUARY 2009 86D0024 • Rev. 3...