Hearth and Home Technologies Burner MHK18NG User Manual

Installation  
Instructions  
TM  
Models:  
Installation and service of this  
appliance should be performed by  
qualified personnel. Hearth & Home  
TechnologiessuggestsNFIcertified  
or factory-trained professionals, or  
technicians super-  
MHK18NG  
MHK24NG  
STMHK18NG  
STMHK24NG  
vised by an NFI  
Fireside Burner/Hearth Kits  
For Natural Gas Use Only  
certified profes-  
sional.  
Check with your local building code agency before you begin installation to ensure compliance with local codes, including  
the need for permits and follow-up inspections. If you encounter any problems regarding code approvals, or if you need  
clarification of any of the instructions contained here, contact the Technical Services Dept., Hearth & Home Technologies  
Inc., phone 1-888-427-3973 or 1-800-927-6841.  
CAUTION  
DO NOT DISCARD THIS MANUAL  
Read, understand  
and follow these  
instructions for safe  
installation and  
operation.  
Leave this manual with  
party responsible for  
use and operation.  
Important operating  
and maintenance  
instructions included.  
WARNING  
WARNING  
HOT! DO NOT TOUCH.  
SEVERE BURNS MAY RESULT.  
CLOTHING IGNITION MAY RESULT.  
If the information in these instruc-  
tions is not followed exactly, a  
fire may result causing property  
damage, personal injury, or death.  
Glass and other surfaces are hot during  
operation and cool down.  
• Do not store or use gasoline or other flam-  
mable vapors and liquids in the vicinity of  
this or any other appliance.  
Keep children away.  
CAREFULLY SUPERVISE children in same room as  
appliance.  
• What to do if you smell gas:  
Alert children and adults to hazards of high  
temperatures.  
Keep clothing, furniture, draperies and other  
combustibles away.  
- 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.  
In the Commonwealth of Massachusetts:  
This appliance must be installed by a licensed plumber  
or gas fitter.  
The chimney flue damper, when used with gas logs, will  
be welded open or completely removed.  
A CO detector shall be installed in the room where the  
appliance is installed.  
Note: An arrow () found in the text signifies change in  
content.  
Hearth & Home Technologies • Fireside Burner/Hearth Kits • 4004-304 Rev C • 08/2010  
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Table of Contents  
1
2
Listing and Code Approvals  
A. Appliance Certification. . . . . . . . . . . . . . . . . . . . . . . . .4  
B. Table 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4  
Getting Started  
A. Size of Firebox. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5  
B. Negative Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . .5  
C. Tools and Supplies Needed. . . . . . . . . . . . . . . . . . . . . 5  
D. Inspect the Appliance and Components . . . . . . . . . . . 5  
E. Components of the Gas Hearth Kit . . . . . . . . . . . . . . . 6  
3
4
Appliance Preparation  
A. Gas Supply Connection. . . . . . . . . . . . . . . . . . . . . . . . 7  
B. Convert to Left Side Gas Piping. . . . . . . . . . . . . . . . . . 7  
C. Gas Pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8  
Installation Instructions  
A. Install the Damper Stop . . . . . . . . . . . . . . . . . . . . . . . .9  
B. Install the Burner/Pan Assembly . . . . . . . . . . . . . . . . . 9  
C. Install the Grate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9  
D. Place Sand and Rockwool. . . . . . . . . . . . . . . . . . . . . . 9  
E. Install the Logs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10  
F. Adjust the Burner Flame . . . . . . . . . . . . . . . . . . . . . . 10  
G. Inspect the Venting System. . . . . . . . . . . . . . . . . . . . 10  
5
6
Operating Instructions  
A. Lighting Instructions. . . . . . . . . . . . . . . . . . . . . . . . . .11  
B. Glass Doors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12  
C. Important Safeguards . . . . . . . . . . . . . . . . . . . . . . . . 12  
Maintaining and Servicing the Appliance  
A. Servicing Your Appliance. . . . . . . . . . . . . . . . . . . . . . 13  
B. Cleaning Your Appliance . . . . . . . . . . . . . . . . . . . . . . 13  
C. Annual Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . .13  
D. Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . .13  
7
Reference Materials  
A. Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . 14-17  
B. Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18-19  
C. Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . .20  
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Listing and Code Approvals  
1
A. Appliance Certification  
WARNING  
The Gas Log Hearth Kits have been tested and listed in the  
U.S. in accordance with ANSI Z21.84-2003 (Gas Log Set).  
They have been listed by OMNI Test Labs for installation and  
operation in the United States and Canada as described in  
these Installation and Operating Instructions. All components  
are UL, OMNI or CSA safety certified.  
Improper installation, adjustment, alteration, service  
or maintenance can cause injury or property damage.  
Refer to the owner’s information manual provided with  
this appliance. For assistance or additional information  
consult a qualified installer, service agency or the gas  
supplier.  
Check with your local building code agency prior to installing  
this appliance to ensure compliance with local codes,  
including the need for permits and follow-up inspections. In  
the absence of local codes, comply with the National Fuel  
Gas Code, ANSI Z223.1-Latest Edition in the U.S. If any  
assistance is required during installation, please contact  
your local dealer or call the Technical Services Department  
at 1-888-427-3973 or 1-800-927-6841.  
WARNING  
Fire Risk  
Exhaust Fumes Risk  
Do NOT use this appliance as a “vent-free  
heater.  
B. Table 1  
The flue must be permanently open. Refer  
to Table 1.  
Product  
MHK18NG  
MHK24NG  
STMHK18NG STMHK24NG  
Inlet BTU / KW /HR  
Nat.  
Nat.  
74,000 / 21.7  
10.0 / .052  
84,000 / 24.6  
10 / .052  
65,000 / 19  
10.0 / .052  
75,000 / 22  
10.0 / .052  
Max. Inlet Pressure  
IN. WC / KPa  
Nat.  
Nat.  
3.5 / .018  
(#26) .147  
3.5 / .018  
(#20) .161  
3.5 / .018  
(#30) .128  
3.5 / .018  
(#28) .141  
Min. Inlet Pressure IN.  
WC / KPa  
Orifice Size  
In. / mm  
Front  
Rear  
28 / 71.1  
16 / 40.6  
14 / 35.6  
16 / 40.6  
34 / 86.4  
18 / 45.7  
16 / 40.6  
18 / 45.7  
28 / 71.1  
-
34 / 86.4  
-
Minimum Fireplace  
Opening Size  
In. / cm  
Depth  
Height  
16 / 40.6  
18 / 45.7  
16 / 40.6  
18 / 45.7  
39 / 251.6  
48 / 309.7  
39 / 251.6  
48 / 309.7  
Min. Vent Opening in  
Square In. / cm  
4
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Getting Started  
2
A. Size of Firebox  
See Table 1 in Section 1.B.  
CAUTION  
Sharp Edges  
B. Negative Pressure  
Wear protective gloves  
and safety glasses during  
installation.  
Negative pressure results from the imbalance of air avail-  
able for the fireplace to operate properly. Causes for this  
imbalance include:  
Exhaust fans (kitchen, bath, etc.).  
Range hoods.  
Combustion air requirements for furnaces, water heaters  
and other combustion appliances.  
Clothes dryers.  
WARNING  
Location of return-air vents to furnace or air  
conditioning.  
Asphyxiation Risk  
This appliance produces carbon monoxide  
(CO).  
Imbalances of the HVAC air handling system.  
Upper level air leaks: recessed lighting, attic hatch  
opening, duct leaks.  
The free opening areas (in square inches)  
of the chimney damper as shown in the  
tables must be met.  
C. Tools and Supplies Needed  
Tools and supplies normally required for installation:  
Pliers  
User must make sure damper is locked  
open.  
The installer is responsible to ensure  
proper ventilation of flue gases before  
appliance is used.  
Phillips screwdriver  
Tape measure  
Fire needs to draft properly for safe  
operation.  
Crescent wrenches  
Gas shutoff valve  
Non-corrosive leak check solution  
3/4 in. wrench, 7/16 in. wrench  
D. Inspect the Appliance and Components  
WARNING  
Remove the contents from the carton. Attached to the  
burner are tags identifying the manufacturer name, serial  
number, model number (including gas log size), BTU  
ratings, gas type, etc.  
Hearth & Home Technologies disclaims any  
responsibility for, and the warranty will be  
voided by, the following actions:  
Review the attached tags before proceeding. Ensure  
that all minimum fireplace dimension requirements are  
achieved using Table 1 in Section 1.B. See Figure 2.1.  
Ensure the gas type provided in the fireplace coincide  
with the gas type marked on the tag.  
Installation and use of any damaged appliance or  
vent system component.  
Modification of the appliance or vent system.  
Installation other than as instructed by Hearth & Home  
Technologies.  
Improper positioning of the gas logs or the glass  
door.  
Installation and/or use of any component part not  
approved by Hearth & Home Technologies.  
Any such action may cause a fire hazard.  
Figure 2.1 Measure Firebox  
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WARNING  
WARNING  
Inspect appliance and components for  
damage. Damaged parts may impair safe  
operation.  
Keep appliance dry.  
Mold or rust may cause  
odors.  
Water may damage controls.  
Do NOT install damaged components.  
Do NOT install incomplete components.  
Do NOT install substitute components.  
Report damaged parts to dealer.  
WARNING  
E. Components of the Gas Hearth Kit  
The Burner/Hearth Kit consists of the following:  
Do NOT use this appliance if any part has been under  
water. Immediately call a qualified service technician  
to inspect the appliance and to replace any part of the  
control system and any gas control which has been  
under water.  
Burner/Pan Assembly  
Grate Assembly  
Glowing Embers  
Sand  
Lava Rock  
Damper Stop  
Aluminum Tubing Assembly  
Brass Elbow Connector  
Brass Orifice & Cap  
Log Set (sold separately)  
WARNING  
Shock Risk  
Fire Risk  
Use ONLY optional accessories approved  
for this appliance.  
Using non-listed accessories voids  
warranty.  
Using non-listed accessories may result  
in a safety hazard.  
Only Hearth & Home Technologies  
approved accessories may be used  
safely.  
6
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Appliance Preparation  
3
Note: Have the gas supply line installed in accordance  
with local building codes, if any. If not, follow ANSI 223.1.  
Installation should be done by a qualified installer approved  
and/or licensed as required by the locality. (In the Common-  
wealth of Massachusetts installation must be performed by  
a licensed plumber or gas fitter.)  
WARNING  
Fire Risk  
Explosion Risk  
Verify inlet pressures.  
High pressure may cause overfire  
condition.  
Low pressure may cause explosion.  
A. Gas Supply Connection  
Install regulator upstream of valve if line  
pressure is greater than 1/2 psig.  
Ensure fittings are of the appropriate size and type on the  
gas line connection. If the tubing has to be cut to length be  
sure to use the proper cutting and flaring tool. Also, be care-  
ful not to crimp the tubing while bending. If the tubing be-  
comes crimped, do not use for installation.  
B. Convert to Left Side Gas Piping  
Remove the brass elbow from the right side.  
Remove the cap from the left side.  
WARNING  
Note: Prior to installing the fittings, use Teflon tape or joint  
compound on the male threads.  
Gas Leak Risk  
Support control when attaching pipe to  
prevent bending gas line.  
Replace the cap on the opposite end of the burner tube.  
Install the brass elbow on the left side of the burner.  
Joint compound or Teflon tape must be used on all threaded  
male connections to ensure a tight seal.  
WARNING  
WARNING  
Fire Risk  
Explosion Risk  
Fire Risk  
Explosion Risk  
Personal Injury Risk  
Gas build-up during line purge may  
ignite.  
Purge should be performed by qualified  
technician.  
Ensure adequate ventilation.  
Ensure there are no ignition sources such  
as sparks or open flames.  
An explosion could occur if a connection is  
made directly to an unregulated propane (LP)  
tank.  
Note: An individual manual shutoff valve (not supplied) is  
required when installing this appliance. The manual shutoff  
valve must be located in an easily accessible area, no more  
than 6 feet from the appliance.  
Note: A listed (and Commonwealth of Massachusetts  
approved) 1/2 in. (13 mm) T-handle manual shut-off valve  
and flexible gas connector are connected to the 1/2 in.  
(13 mm) control valve inlet.  
If substituting for these components, please consult  
local codes for compliance.  
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Gas Supply Pressure: Minimum inlet gas supply pressure  
must be 3.5 in. W.C. for the purpose of input adjustment.  
Maximum inlet gas pressure must not exceed 10.0 in. W.C.  
The gas line supplying the appliance must be sufficient  
size to furnish the appropriate supply pressure to the  
appliance while operating in the “High” setting. (Minimum  
line ID of 1/2 in. required if the line is longer than 20 ft.  
Gas Line Pressure Test: Perform pressure test according  
to state and local code (if pressure exceeds 1/2 in. psi [3.5  
kPa]) before appliance is connected. Be sure to release  
air pressure from the gas line before connection is made  
to the appliance.  
Gas Leak Test: Make sure the gas connections are tight.  
Turn on the gas and coat each joint with a non-corrosive  
gas leak check solution. Air bubbles will form indicating  
any leaks. DO NOT USE A FLAME OR ANY TYPE OF  
IGNITION SOURCE TO CHECK FOR LEAKS. All leaks  
must be corrected before proceeding with installation.  
The appliance must only be installed in a solid-fuel burning  
fireplace with the flue damper clamped open. The fireplace  
must be constructed of non-combustible material.  
The minimum permanent free opening (in square inches)  
that must be provided by the fireplace chimney or damper  
to vent the flue gases is provided in Table 1. If the free  
opening is smaller than the specified area, do not use this  
appliance.  
C. Gas Pressure  
Proper input pressures are required for optimum appliance  
performance. Gas line sizing requirements need to be made  
following NFPA51.  
WARNING  
Fire Risk  
Explosion Risk  
High pressure will damage valve.  
Disconnect gas supply piping BEFORE  
pressure testing gas line at test pressures  
above 1/2 psig.  
Close the manual shutoff valve BEFORE  
pressure testing gas line at test pressures  
equal to or less than 1/2 psig.  
WARNING  
CHECK FOR GAS LEAKS  
Fire Risk  
Explosion Risk  
Asphyxiation Risk  
Check all fittings and connections.  
Do not use open flame.  
The damper must be removed or fixed in a manner in  
which will secure it open. Some jurisdictions require the  
damper to be removed or permanently welded fully open.  
Check with state and local codes.  
Be sure that the chimney is completely unobstructed to  
ensure proper ventilation of flue gases including carbon  
monoxide (CO). CO (a poisonous gas) is tasteless,  
odorless, colorless and undetectable without proper  
equipment.  
After the gas line installation is complete,  
all connections must be tightened and  
checked for leaks with a commercially  
available, non-corrosive leak check  
solution. Be sure to rinse off all leak check  
solution following testing.  
Fittings and connections may have loosened  
during shipping and handling.  
High Altitude Derate  
In the USA, input BTU shall be derated 4% (one orifice size)  
per 1000 feet for altitudes above 2000 feet. In Canada, input  
BTU shall be derated 10% (two orifice sizes) at altitudes  
from 2000-4500 feet.  
8
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Installation Instructions  
4
A. Install the Damper Stop  
Open the damper to the fully open position and secure it  
open with the stop as shown in Figure 4.1.  
If the damper stop doesn’t fit your application, use a  
permanent means that will keep the damper open at  
least to the minimum vent opening as outlined in Table 1,  
Section 1.B.  
Figure 4.2 Center Grate Over Burner Pan  
D. Place Sand and Rockwool  
Pour the sand into the burner pan. Sand should follow the  
slope of pan, covering it and the burner tube completely.  
Allow the sand to spill out the front of the pan and over  
the sides onto the fireplace floor.  
Lightly place dime-sized pieces of rockwool evenly on top  
of the sand or vermiculite.  
The gas burns at the point of the least resistance. In  
case of an uneven flame pattern it may be necessary to  
adjust the materials in the pans (using an object such as  
a screwdriver) to achieve the desired effect.  
Figure 4.1 Damper Operation  
B. Install the Burner/Pan Assembly  
The burner/pan assembly is shipped ready for right-hand  
gas connection. See Section 3.B. for left-hand connection.  
WARNING  
Explosion Risk  
Remove the existing cap or gas jet assembly from the  
gas stub in your fireplace. Clean the threads using a wire  
brush or steel wool. Apply Teflon tape or pipe dope to the  
steel fitting and attach the provided brass adapter to the  
stub.  
Follow rockwool placement instructions  
in this manual.  
Replace rockwool material annually.  
Improperly placed rockwool interferes with  
proper burner operation.  
Place the burner/pan assembly in the fireplace. The pan  
should be centered both front to back and side to side.  
Bend the provided gas connector to facilitate its installation  
between the burner and the gas stub.  
Attach one end of the gas connector to the brass elbow  
or safety pilot fitting. Attach the other end to the brass  
adapter at the gas tube.  
Note: For best results, do not pack down the rock wool.  
The placement of rock wool can have an effect on flame  
pattern and may need to be adjusted to achieve a desired  
appearance.  
C. Install the Grate  
The grate should be centered over the burner pan, side  
to side. If the grate sits toward the front of the burner pan,  
the flames will be larger coming through the logs. If the  
grate sits toward the back of the burner pan, the ember  
bed will be more prominent. Refer to Figure 4.2.  
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E. Install the Logs  
F. Adjust the Burner Flame  
The burner flame can be adjusted at the manual shutoff  
valve beside the fireplace to obtain the desired flame  
appearance.  
WARNING  
The flame color will stabilize after ten minutes of  
operation.  
Fire Risk  
Explosion Risk  
Personal Injury Risk  
G. Inspect the Venting System  
Failure to position the parts in accordance  
with the diagrams provided with the log  
packages or failure to use only parts  
approved with this appliance may result in  
property damage or personal injury.  
The fireplace venting system is designed and constructed to  
develop a positive flow adequate to remove flue gases to the  
outside atmosphere. See fireplace installation instructions.  
A spillage test must be made before the installed  
appliance is left with the consumer  
Install the logs using the installation instructions included  
with them.  
Close all doors and windows in the home.  
Light the log set.  
After three minutes, test with a smoke match, smoke  
candle, stick incense or cigarette one inch below the top of  
the opening (lintel) moving across the full width. If spillage  
(smoke drawn into the room) occurs, it will most likely be  
near the top, outside corners.  
Light the burner as outlined in the operating section. Allow  
the flame pattern to stabilize. If you are satisfied with the  
flame pattern go to the next step. If you want more or less  
flame around the front log, turn off the gas and move the  
grate backward or forward.  
Once you are satisfied, turn on the gas and go on to the  
next step.  
Possible Cures if Spilling Occurs  
The damper should be fully open.  
Arrange the top logs as shown in your log set up  
instructions. Light the burner as outlined in the operating  
instructions and allow the flame to stabilize.  
Spread the lava rock around the outside of the burner  
pan on the floor of the fireplace. If possible, cover the gas  
connector with the cinders.  
The fireplace opening needs to be reduced by adding a  
drop panel across the top under the lintel.  
The air supply from outdoors needs to be increased. Open  
the outside air kit if the appliance is so equipped, or crack  
open a door or window.  
If necessary, seek expert advice. Do not operate this  
appliance.  
Cleaning  
Note: If your log set is the burnt-out type, place the rock  
wool in the center of the logs to give a glowing ember  
effect.  
Periodic examination and cleaning of the venting system  
of the fireplace should be done before initial use and at  
least annually by a qualified agency.  
WARNING  
Fire Risk  
Explosion Risk  
Inspect external vent cap regularly.  
Ensure no debris blocks cap.  
Combustible materials blocking cap may  
ignite.  
Restricted air flow affects burner  
operation.  
10  
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Operating Instructions  
5
A. Lighting Instructions  
FOR YOUR SAFETY READ BEFORE LIGHTING  
WARNING! IF THESE INSTRUCTIONS ARE NOT FOLLOWED EXACTLY, A FIRE OR EXPLOSION MAY RESULT  
CAUSING PROPERTY DAMAGE, PERSONAL INJURY OR LOSS OF LIFE.  
A. This appliance has a manually lighted burner and must be lit by hand. When lighting the burner, follow these  
instructions exactly.  
B. BEFORE LIGHTING 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.  
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.  
C. Do not use this appliance if any part has been under water. Immediately call a qualified service technician to inspect  
the appliance and to replace any part of the control system and any gas control that has been under water.  
D. Use only your hand to push in or turn the gas control handle. Never use tools. If the handle will not push in or turn  
by hand, do not try to repair it. Call a qualified service technician. Force or attempted repair may result in fire or  
explosion.  
LIGHTING INSTRUCTIONS  
1. STOP! Read the safety information previously listed above.  
2. Turn gas control manual valve to the full “OFF” position.  
3. Wait 5 minutes to clear out any gas. Then smell for gas, including near the floor. If you smell gas, STOP! Follow “B”  
in the safety information above on this label. If you don’t smell gas, go to the next step.  
4. Place a lit match on the surface of the burning embers. Do not hold match in hand.  
5. Turn gas control manual valve to the full “ON” position.  
6. If appliance will not operate, follow the instructions “TO TURN OFF GAS TO APPLIANCE” and call your service  
technician or gas supplier.  
TO TURN OFF GAS TO APPLIANCE  
Turn manual gas control handle to “OFF” position. Do not force.  
(Located in wall or floor  
near fireplace)  
(Place lit match in ember bed before turning on valve)  
Valve  
Valve Key  
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Aqualifiedservicetechnicianmustperforminstallation  
andrepair.Theapplianceshouldbeinspectedandcleaned  
annually by a qualified service technician. More frequent  
cleaning may be required due to excessive lint, dust, pet  
hair, etc. It is imperative that the control compartments,  
burners and air passageways are unobstructed during  
operation.  
B. Glass Doors  
If your fireplace is equipped with glass doors:  
Glass doors should be in fully open poisition when  
appliance is operating.  
Operating in the closed position will block the radiant heat  
output and may cause incomplete combustion of the gas  
and minimize overheating of any valve installation.  
-
Review proper placement of logs, rockwool, lava rock,  
sand or vermiculite.  
-
-
Ensure there are no gas leaks.  
Ensure the flow of combustion and ventilation air is not  
obstructed (front grilles and vent caps).  
WARNING  
Fire Risk  
Before installing into a solid fuel burning fireplace, the  
chimney and firebox should be inspected and cleaned to  
remove soot, creosote, ashes, paint, bird nests etc.  
Annual examination of the chimney must be performed  
by a qualified agency to ensure proper ventilation of flue  
gases created by this appliance.  
Have the chimney and adjacent structure inspected  
and cleaned by qualified professionals. Hearth & Home  
Technologies recommends that NFI certified professionals,  
or technicians under the direction of certified professionals,  
conduct a minimum of an NFPA 211 Level 2 inspection  
of the chimney.  
Replace component parts of the chimney and fireplace as  
specified by the professionals.  
Ensure all joints are properly engaged and the chimmney  
is properly secured.  
Do not allow fans to blow directly into the fireplace. Avoid  
any drafts that alter burner flame pattern.  
Do not use a blower insert, heat exchanger insert or other  
accessories not approved for use with this appliance.  
Solid fuels shall not be burned in a fireplace where a  
decorative appliance is installed.  
Explosion Risk  
Do not close the glass doors during appliance  
operation.  
Could cause incomplete combustion of  
the gas.  
Glass doors may be closed when the hearth kit is not being  
used.  
C. Important Safeguards  
Other Fuels  
-
Althoughyourgaslogsetisveryrealisticinappearance,  
it is not a real woodburning fire and must not be used  
for burning any fuel other than natural gas.  
To avoid irreparable damage to the appliance and/or  
personal injury, wood, matches, paper, garbage or any  
other material must not be placed or thrown on top of  
the logs.  
-
Appliance Safety  
-
-
-
To avoid personal injury, do not touch hot surfaces  
when the appliance is operating.  
Always ensure that the fireplace screen is closed when  
the appliance is operating.  
Close supervision is necessary when the appliance is  
being used near children.  
If glass doors are present, the glass doors must be fully  
opened while appliance is in operation.  
Do not remove any of the attached metal plates, which  
contain important safety and operating information.  
Keep the appliance area clear and free of all combustible  
materials, gasoline and other flammable vapors and  
liquids.  
WARNING  
Fire Risk  
High Temperatures  
Keep combustible household items away  
from appliance.  
Do NOT obstruct combustion and ventilation  
air.  
WARNING  
Do NOT place combustible items on top  
of or in front of appliance.  
Do NOT use this appliance if any part has been under  
water. Immediately call a qualified service technician  
to inspect the appliance and to replace any part of the  
control system and any gas control which has been  
under water.  
Keep furniture, draperies away from  
appliance.  
12  
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Maintaining and Servicing the Appliance  
6
A. Servicing Your Appliance  
C. Annual Inspection  
WARNING  
WARNING  
Risk of injury or property damage  
Before servicing:  
Annual inspection by qualified technician  
recommended.  
Check:  
Turn off gas.  
Condition of doors, surrounds and fronts.  
Obstructions of combustion and ventilation  
air.  
Turn off electricity to appliance.  
Disable remote control, if one is present.  
Ensure appliance is completely cooled.  
Condition of logs.  
Condition of firebox.  
Gas connections and fittings.  
Obstructions of termination cap.  
After Servicing:  
Replace any screen or barrier that was removed.  
Reseal and reinstall any venting removed for  
servicing.  
Clean:  
Glass.  
Logs.  
Burner, burner ports.  
Repair and replacement work should be done by a  
qualified service technician.  
Alwaysshutoffthegassupplyandmakesuretheappliance  
is cool before beginning any service operation.  
Always check for gas leaks after servicing.  
Always check for proper venting.  
Risk of:  
Fire  
Delayed ignition or explosion  
Exposure to combustion fumes  
Odors  
B. Cleaning Your Appliance  
Your gas logs require little care. Keep the burner assembly,  
logs and burner area surrounding the logs clean by  
vacuuming or brushing with a dry paint brush at least twice  
a year.  
D. Troubleshooting  
With proper installation and maintenance, your new  
decorative gas appliance should provide years of trouble-  
free service. If you do experience a problem, refer to the  
troubleshooting guide below. This guide will assist you or a  
qualified service technician in the diagnosis of problems and  
the corrective action to be taken.  
The logs become fragile after burning. Take care in  
handling.  
Always turn off the gas before cleaning. For relighting,  
refer to lighting instructions located in Section 5.A. of these  
instructions.  
Symptoms  
Possible Causes  
Corrective Action  
Always keep the appliance clear and free from combustible  
materials, gasoline, and other flammable vapors and  
liquids.  
Never obstruct the flow of combustion and ventilation air.  
Keep the front of the appliance clear of all obstacles and  
materials.  
1. A match will  
not light the  
A. Main gas shutoff  
valve is closed  
1. Make sure the shutoff  
valve located on the  
incoming gas line is  
open.  
main burner;  
no gas to the  
main burner  
B. There is air in the  
gas line.  
1. Bleed air from the gas  
line; wait five minutes  
and attempt to relight  
the main burner.  
Leave clearance of at least 36 in. from the front of the  
fireplace.  
The air shutter should not be blocked.  
C. No gas supply to  
the appliance.  
1. Check the plumbing to  
ensure the appliance  
has been hooked up  
to the gas supply line.  
CAUTION  
Logs can get very hot. Handle only when they are  
cool.  
D. A blockage is  
1. Inspect the burner  
orifice for obstruction.  
Call a qualified  
preventing gas flow.  
service technician.  
Hearth & Home Technologies • Fireside Burner/Hearth Kits • 4004-304 Rev C • 08/2010  
13  
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Reference Materials  
7
A. Replacement Parts  
Service Parts  
Fireside HeartH Kits  
Exploded Parts Diagram  
MHK-NG  
Beginning Manufacturing Date:8/1/2010  
Ending Manufacturing Date: Active  
TM  
1 - MHK Burner Pan Assembly  
2 - MHK Grate Assembly  
MHK Hearth Kit Assembly  
7
5
8
3
6
4
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Hearth & Home Technologies • Fireside Burner/Hearth Kits • 4004-304 Rev C • 08/2010  
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Service Parts  
Fireside HeartH Kits  
Service Parts List  
MHK -NG  
Beginning Manufacturing Date:8/1/2010  
Ending Manufacturing Date: Active  
TM  
#
Description of Part  
Burner Pan Assy  
Grate Assy  
MHK18NG  
MHK24NG  
Qty.  
1
1
SRVAGLBP14 SRVAGLBP18  
2
3
4
5
6
7
8
SRVAG16  
BPO-2-26  
SRVAG18  
BPO-2-20  
1
Orifice  
1
Connector Tube  
Damper Stop Assy  
SRV3814NXN SRV3814NXN  
1
SRV500-SC  
01-1050  
SRV500-SC  
01-1050  
1
Elbow, 3/8” MFL x 3/8” FPT Brass  
Elbow, 3/8” Flare x 1/2” FIP Brass  
Cap, 1/2” Malleable Pipe  
Sand  
1
10-1037  
10-1037  
1
10-1053  
10-1053  
1
SRVACC15  
SRVACC10  
SRVACC12  
SRVACC15  
SRVACC10  
SRVACC12  
1
Lava Rock  
1
Glowing Embers  
1
Hearth Kit Install  
4004-304  
4004-304  
1
Hearth & Home Technologies • Fireside Burner/Hearth Kits • 4004-304 Rev C • 08/2010  
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Service Parts  
Fireside HeartH Kits  
Exploded Parts Diagram  
STMHK-NG  
Beginning Manufacturing Date:8/1/2010  
Ending Manufacturing Date: Active  
TM  
1 - STMHK Burner Pan Assembly  
2 - STMHK Grate  
5
7
3
6
4
16  
Hearth & Home Technologies • Fireside Burner/Hearth Kits • 4004-304 Rev C • 08/2010  
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Service Parts  
Fireside HeartH Kits  
Service Parts List  
STMHK -NG  
Beginning Manufacturing Date:8/1/2010  
Ending Manufacturing Date: Active  
TM  
#
Description of Part  
Burner Pan Assy  
Grate Assy  
STMHK18NG  
STMHK24NG Qty.  
1
SRVOBP18ST SRVOPB20ST  
1
1
1
1
1
1
1
1
1
1
2
3
4
5
6
7
SRVAG16  
BPO-2-26  
SRVAG18  
BPO-2-20  
Orifice  
Connector Tube  
Damper Stop Assy  
SRV3814NXN SRV3814NXN  
SRV500-SC  
01-1050  
SRV500-SC  
01-1050  
Elbow, 3/8” MFL x 3/8” FPT Brass  
Elbow, 3/8” Flare x 1/2” FIP Brass  
Sand  
10-1037  
10-1037  
SRVACC15  
SRVACC10  
SRVACC12  
SRVACC15  
SRVACC10  
SRVACC12  
Lava Rock  
Glowing Embers  
Hearth Kit Install  
4004-304  
4004-304  
1
Hearth & Home Technologies • Fireside Burner/Hearth Kits • 4004-304 Rev C • 08/2010  
17  
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18  
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Hearth & Home Technologies • Fireside Burner/Hearth Kits • 4004-304 Rev C • 08/2010  
19  
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C. Contact Information  
TM  
Please contact your Hearth & Home Technologies dealer with any questions or concerns.  
For the number of your nearest Hearth & Home Technologies dealer, please call 1-800-927-6841 or 1-888-427-3973.  
- NOTES -  
CAUTION  
DO NOT DISCARD THIS MANUAL  
Read, understand  
and follow these  
instructions for safe  
installation and  
operation.  
Leave this manual with  
party responsible for  
use and operation.  
Important operating  
and maintenance  
instructions included.  
20  
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