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MHSC MJ27NR Installation And Operating Istructions

Unvented gas log heater or vented decorative appliance
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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
This appliance is only for use
with the type of gas indicated on
not convertible for use with other
It uses air (oxygen) from the room
for adequate combustion and
If the information in this manual is not followed exactly,
–
–
READ AND SAVE THESE INSTRUCTIONS
Control Type: Millivolt Hi/Low
WARNINGS
vapors and liquids in the vicinity of this or any other
WHAT TO DO IF YOU SMELL GAS
• Do not touch any electrical switch; do not use any
• Immediately call your gas supplier from a neighbor's
Installation and service must be performed by
a qualified installer, service agency or the gas
86D0024 10/08 Rev. 1

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Summary of Contents for MHSC MJ27NR

  • Page 1: Installation And Operating Instructions

    Unvented Gas Log Heater or Vented Decorative Appliance Installation and Operating Instructions 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, located, manufactured (mobile) home, where not prohibited by This appliance is only for use vapors and liquids in the vicinity of this or any other with the type of gas indicated on...

  • Page 2: Table Of Contents

    CONTENTS Important Safety Information Electrical Wiring (Millivolt) Connecting Remote Receiver ......22 Getting Started Checking System Operation ......22 Natural Gas ............6 Ember and Rock Installation Propane/LPG ............6 Andiron Installation Ignition Controls ...........6 Flame Appearance Pilot/ODS .............6 Thermal Generator ..........6 Checking Burner Flames General Installation Information Operating Instructions Codes ..............7...

  • Page 3: Important Safety Information

    INSTALLER OWNER Please leave these instructions with the appliance. Please retain these instructions for future reference. Read these instructions carefully before installing or trying to operate this vent-free gas heater. • Do not use a blower insert, heat exchanger insert or other accessory, not approved 9.
  • Page 4 continued from page 3 23. Do not use this room heater if any part has been visions for adequate combustion and ventilation air technician to inspect the room heater and to replace must be provided. See page 8. any part of the control system and any gas control which has been under water.

  • Page 5: Getting Started

    GETTING STARTED 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 • Installation/Operating Instructions • Two (2) Anchoring Screws •...

  • Page 6: Natural Gas

    " 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. MJ27NR Millivolt 38,000 25,500 " w.c. Min. 5" w.c. 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… 1430 Broadway New York, NY 10018 Batterymarch Park Quincy, MA 02269 ADEQUATE COMBUSTION AND VENTILATION AIR sions are provided for adequate combustion and ventilation air.
  • Page 8 GENERAL INSTALLATION INFORMATION Counter Fireplace Figure 1 - Example of a Large Room with 1/2 Wall Divider hr = Consider two connecting rooms with an open area between, with the following dimensions: = 15 Ft., L hr = If there were a door between the two rooms the calculation would be based only on the room with the heater.
  • Page 9 and HEARTH DIMENSIONS This appliance is for installation only in a solid-fuel burning masonry or Exception: includes instructions stating it has not been tested or should not be used places: or BUF Gas Fired Decorative Type Unvented Room Heaters per IAS Requirement No. 2-97 ANSI Z21.91- the minimum hearth dimensions shown below.

  • Page 10: With A Restrictive Barrier

    Height of Restriction (X) Minimum Depth of Fireplace/Firebox No restriction 14" 0 to 1 " 17" From 1 " to 3" 17" Greater than 3" ANY BARRIER GREATER THAN THREE INCHES (3") PLACED IN FRONT OF THE GAS LOG SET IS NOT RECOMMENDED BY THE MANUFACTURER. The log set should be placed against Glass door frames or as near as possible to the rear wall...

  • Page 11: Clearances And Height Requirements

    CLEARANCES and HEIGHT REQUIREMENTS The dimensions shown in Figures 4 through 11 Sidewall and ceiling clearances: The sides at least 16" from any combustible wall. The ceiling must be at least 42" 42" 16" FP1996 Figure 4 - Sidewall and Ceiling Clearances 86D0024...
  • Page 12 CLEARANCES and HEIGHT REQUIREMENTS Heat resistant material (minimum requirements) with no wooden mantel or other combustible projection: per Figure 5, then see TABLE A. Heat resistant materials such as slate and marble must damper open. Refer to “Installing Vented Applications” found on Page 18. Heat Resistant Material Measure...
  • Page 13 CLEARANCES and HEIGHT REQUIREMENTS Heat resistant material (minimum requirements) with wooden mantel or other combustible projection: resistant material shown in Figure 6, then refer to Table B. 8" or More of Heat Resis- Hood tant Materials Heater in Fireplace or FP1998 Figure 6 - Measuring Heat Resistant Material for Mantel Heat Resistant...
  • Page 14 CLEARANCES and HEIGHT REQUIREMENTS 12" 10" 8" 6" Heat 1 /2 " Resistant Material 8" 14 1 /2 "18 5 /8 " 22 1 /2 " 26" 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, " Mantel The mantel also projects 7" at 14 " above the opening, Minimum of 8"...

  • Page 16: Floor Clearance

    FLOOR CLEARANCE The gas log heater must be installed at least 1 surface of carpeting, tile, etc. Figure 10 Figure 11 Heater in Fireplace or Combustible Material " Minimum FP2003 Figure 10 - Minimum Clearance above Combustible Flooring Heater in Fireplace or Combustible Material...
  • Page 17 BEFORE FULLY INSTALLING THE UNIT: • Turn OFF drafting may cause pilot outage or sooting. Use a heat resistant sealant. Before installing in a solid fuel burning be cleaned of soot, creosote, ashes and loose Manual and Millivolt controlled gas logs may be installed as a vented decorative log set in compliance with ANSI Z21.60 and National Fuel Gas Code, Section 6.6.

  • Page 18: Installing Vented Applications

    2. Anchor holes are located on the right and left sides of the unit. After centering the burner cor- " deep. Figure 13 Screw Screw FP2006 Anchor Hole Figure 13 - Secure Heater to Floor of Fireplace/Firebox 86D0024...

  • Page 19: Connecting The Gas

    CONNECTING THE GAS codes. Figure 14 To Heater Pipe Coupling Valve Pipe Stainless Locations that the Pressure Tapping Point May Be Installed Gas Supply Inlet Manual Shutoff Valve FP2007 Figure 14 - Gas Connection only the heater valve. 86D0024...

  • Page 20: Millivolt

    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 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 ODS Pilot Motor Millivolt Valve TH = 3 TP = 1 TP/TH = 2 FP2009 Figure 16 - Wiring Diagram 86D0024...

  • 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- Connectors nector on the receiver.
  • Page 23 Before you begin bare hands. After handling the logs, wash Never add additional logs or embellishments such as pine cones, vermiculite or rock wool to Dime-Sized Before installing logs, place rock- Pieces of Rock wool in dime size pieces evenly over small burner ports starting towards the front.
  • Page 24 Log #8 valve by sliding grooves on sides of log into cutout on brackets. Figure Figure 20 - Install Log #8 LG553 Log #1 2. Place log #1 by setting the log over the rear bracket over the two pins. Figure Figure 21 - Install Log #1 LG554...
  • Page 25 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 8. Place log #7 between the second and third right tong on the grate as shown in Figure 27. Figure 27 - LG549 Log #7 can be seen. Try to avoid stacking these embers on top of each other. Use smaller, stringier Flickering Ember Area LG556...

  • Page 27: Ember And Rock Installation

    ANDIRON and ROCK INSTALLATION ANDIRON INSTALLATION 2, Andirons 2, Brackets 2, 2 Bolts Assembly Instructions 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 Bracket FP2012 FP2013...

  • Page 28: Flame Appearance

    Flames from the pilot and burner should be visually checked as soon as the heater It should just touch the top of the thermocouple tip for natural. Figure 31 reliably. Refer to Figure 32 Thermocouple for Natural Thermocouple for Natural Thermocouple Thermocouple for LP...

  • Page 29: Checking Burner Flames

    CHECKING THE BURNER FLAME should be observed: LG551 Figure 33 - Correct Burner Flame Appearance Figure 33. There should be glow- ing embers on the front burner. color during the burn off time. Do not allow fans to blow directly into the During manufacturing, fabricating and shipping, various components of this appliance are treated annoying smoke and smells as they are burned off during the initial operation of the appliance, possibly causing headaches or eye or lung irritation.

  • Page 30: Operating Instructions

    FOR YOUR SAFETY READ BEFORE LIGHTING If you do not follow these instruction causing property damage, personal 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. BEFORE OPERATING smell all around the appliance area for gas.

  • Page 31: Millivolt Control Lighting Instructions

    Millivolt CONTROL LIGHTING INSTRUCTIONS 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. 4.

  • Page 32: Cleaning And Servicing

    / CLEANING and SERVICING MATCH LIGHTING INSTRUCTIONS etc.). 2. Follow appropriate lighting instructions found previously. Instead of pushing and releasing the 3. After control knob has been released and pilot stays lit, reinstall any items that were removed for pilot access. CLEANING AND SERVICING Turn off heater and allow to cool before Remove logs, handling carefully by holding gently at each end.

  • Page 33: Troubleshooting

    TROUBLESHOOTING Turn appliance OFF and allow to cool before Note: All troubleshooting items are listed in order of operation. REMEDY 1. Ignitor electrode positioned wrong. 1 Replace ignitor. pressed, there is no spark at ODS/pilot. 2. Ignitor electrode is broken. 2.
  • Page 34 TROUBLESHOOTING If the gas quality is bad, your pilot may not stay lit, the burners may produce soot and REMEDY 1. Control knob not fully pressed in. 1. Press in control knob fully. goes out when control 2. Control knob not pressed in long 2.

  • Page 35: Burner Assembly

    BURNER ASSEMBLY Failure to position the parts in accordance with these diagrams or approved with this appliance may result in property damage or personal BURNER ASSEMBLY 1. Burner 86D0017 86D0018 2. Control Valve 20H2081 20H2082 3. ODS Pilot Assembly 14D0473 14D0473 4.

  • Page 36: Logs

    LOGS 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 approved with this appliance may result in property damage or personal 86D0024...

  • Page 37: Massachusetts Residents Only

    MASSACHUSETTS RESIDENTS ONLY: PLEASE READ AND FOLLOW THESE SPECIAL REQUIREMENTS NOTE REGARDING VENTED PRODUCTS setts. NOTE REGARDING VENT FREE PRODUCTS setts. sachusetts. CARBON MONOXIDE DETECTOR REQUIREMENTS stalled. 86D0024...
  • Page 38 NOTES 86D0024...

  • Page 39: Warranty

    In states that do not allow limitations on how long an implied warranty lasts, or do not allow upon method of settlement. 1. Contact your supplier. Make sure you have your warranty, your sales receipt and the model/serial number of your MHSC product.
  • Page 40 MHSC 149 Cleveland Drive • Paris, Kentucky 40361 www.mhsc.com OCTOBER 2008...

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