MHS Boilers DYD18 Installation And Operating Instructions Manual Download Page 4

65D0001

IMPORTANT SAFETY INFORMATION

This  appliance  may  be  installed  in  an  aftermar-
ket, 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.

Continued from page 3

13.  Avoid any drafts that alter burner flame patterns. Do not 

allow fans to blow directly into fireplace. Do not place 

a blower inside burn area of firebox. Ceiling fans may 

create drafts that alter burner flame patterns. Sooting and 

improper burning will occur.

14. 

Caution:

  Candles,  incense,  oil  lamps,  etc.  produce 

combustion byproducts including soot. Vent-free appli-

ances will not filter or clean soot produced by these types 

of products. In addition, the smoke and/or aromatics 

(scents) may be reburnt in the vent-free appliance which 

can produce odors. It is recommended to minimize the 

use of candles, incense, etc. while the vent-free appli-

ance is in operation. 

15.  This is an unvented gas-fired heater. It uses air (oxygen) 

from the room in which it is installed. Provisions for ad-

equate combustion and ventilation air must be provided. 

See page 7.

 

16.  Keep room area clear and free from combustible materi-

als, gasoline and other flammable vapors and liquids.

17.  Unvented gas heaters are a supplemental zone heater. 

They are not intended to be a primary heating appliance. 

Water vapor produced by an unvented heater can create 

moisture problems in a home when operated for extended 

periods of time.

18.  During manufacturing, fabricating and shipping, various 

components of this appliance are treated with certain 

oils, films or bonding agents. These chemicals are not 

harmful but may produce annoying smoke and smells 

as they are burned off during the initial operation of the 

appliance; possibly causing headaches or eye or lung 

irritation. This is a normal and temporary occurrence.

    The initial break-in operation should last two to three 

hours with the burner at the highest setting. Provide 

maximum ventilation by opening windows or doors to 

allow odors to dissipate. Any odors remaining after this 

initial break-in period will be slight and will disappear 

with continued use.

19.  Input ratings are shown in BTU per hour and are for 

elevations up to 2,000 feet. For elevations above 2,000 

feet, input ratings should be reduced 4 percent for each 

1,000 feet above sea level. See the National Fuel Gas 

Code.

20.  The  heater  and  its  individual  shutoff  valve  must  be 

disconnected from the gas supply piping system during 

any pressure testing of that system at test pressures in 

excess of 1/2 psig (3.5 kPa).

21.  The heater must be isolated from the gas supply piping 

system by closing its individual manual shutoff valve 

during any pressure testing of the gas supply piping 

system at test pressures equal to or less than 1/2 psig 

(3.5 kPa).

22.   Do not use this room heater if any part has been under 

water. Immediately call a qualified service technician 

to inspect the room heater and to replace any part of the 

control system and any gas control which has been under 

water.

23.  This appliance must not be used with glass doors in the 

closed position. This can lead to pilot outages and severe 

sooting outside the fireplace.

24.  Never burn solid fuels in a fireplace where a unvented 

room heater is installed.

25.  Always have a fireplace screen in place when the ap-

pliance is in operation and , unless other provisions for 

combustion air are provided, the screen shall have an 

opening(s) for induction of combustion air.

www.nficertified.org

We suggest that our gas hearth 
products be installed and 
serviced by professionals who 
are certified in the U.S. by the 
National Fireplace Institute

®

 

(NFI) as Gas Specialists. 

Never connect unit to private 
(non-utility) gas wells.  This gas is 
commonly known as wellhead gas.

W

ARNING

Attention Massachusetts Residents:
This product must be installed by a licensed gas 
fitter.

Summary of Contents for DYD18

Page 1: ...n this manual is not followed exactly a fire or explosion may result causing property damage personal injury or loss of life Do not store or use gasoline or other ammable vapors and liquids in the vic...

Page 2: ...ce Preparation 15 Installing Vented Appliance 16 Connecting the Gas 17 Checking Gas Pressure 18 Electrical Wiring Millivolt 19 Log Placement 21 Flame Appearance 22 Checking Burner Flame 23 Operating I...

Page 3: ...upervised when they are in the same room with the appliance 4 Do not place clothing or other ammable material on or near the appliance 5 Any safety screen or guard removed for servicing an appliance m...

Page 4: ...tion This is a normal and temporary occurrence The initial break in operation should last two to three hours with the burner at the highest setting Provide maximum ventilation by opening windows or do...

Page 5: ...refully inspect the contents for shipping damage If any parts are missing or damaged immediately inform the dealer from whom you purchased the appliance Do not attempt to install any part of the appli...

Page 6: ...lot HI LOW Variable position corresponding to desired ame height heat input Millivolt control has four 4 positions OFF All gas to the gas logs is shut off at the valve IGN Valve position to light main...

Page 7: ...nstalled in that space An uncon ned space is de ned as a space whose volume is not less than 50 cubic feet per 1 000 BTU per hour 4 8 m3 per kw of the aggregate input rating of all appliances installe...

Page 8: ...lculation would be based only on the room with the heater BTU Hr 151 2 x 12 x 8 50 GENERAL INSTALLATION INFORMATION Figure 1 Example of a Large Room with 1 2 Wall Divider Counter Fireplace x 1000 x 10...

Page 9: ...ANSI Z21 91b 2004 as long as rebox hearth dimensions meet the minimum hearth dimensions shown below Figure 2 Hearth Minimum Dimension for Solid Fuel Burning Fireplaces and UL127 Factory Built Firepla...

Page 10: ...et in an Enclosure NOTE Non combustible material such as refractory brick may be used to line the oor of the replace in order to raise the height of the gas log set in relation to a restrictive barrie...

Page 11: ...s shown in Figures 4 through 10 and de ned in the replace manufacturer s instructions are minimum clearances to maintain when installing this heater Left and right clearances are determined when facin...

Page 12: ...rojection above the replace 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 thick Sheet metal sh...

Page 13: ...m the wall a maxi mum of 2 1 2 at a minimum of 13 above the opening and a maximum of 10 at a minimum of 18 above the opening HEAT RESISTANT MATERIAL MEASUREMENT REQUIREMENTS FOR SAFE INSTALLATION WITH...

Page 14: ...r than 14 to the base of the replace The minimum distance must be maintained from the top surface of carpeting tile etc See Figure 9 OR The gas log heater may be installed nearer to the oor if a minim...

Page 15: ...uctions Have this cleaning performed annually after installation Seal any fresh air vents or ash clean out doors located on oor or wall of replace If not drafting may cause pilot out age or sooting Us...

Page 16: ...lace and gas logs function as a system If the replace is spilling into the room check with a match or a smoke stick reposition the damper clamp until a positive draft is obtained by opening the damper...

Page 17: ...at the Pressure Tapping Point May Be Installed 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...

Page 18: ...g to pressure gauge After taking pressure reading reinstall test plug Check for gas leaks MILLIVOLT CONTROL Figure 15 The valve regulator controls the burner pressure which should be checked at the pr...

Page 19: ...end connect one wire to TP TH and one wire to TH The color of the wires does not matter Or you can hook the wall switch of thermostat to wires on the left side of the unit Figure 16 Wiring Diagram Op...

Page 20: ...mote Receiver Velcro Pads Remote Receiver CHECK TEST TO TEST CONNECT METER LEADS TO TERMINALS THERMOSTAT CONTACTS METER READING SHOULD BE A COMPLETE SYSTEM 2 3 CLOSED CLOSED B THERMOPILE OUTPUT 1 2 OP...

Page 21: ...s gently with soap and water to remove any traces of bers Top Left Log 3 Log Pins The positioning of the log unit is critical to the safe and clean operation of this heater Sooting and other problems...

Page 22: ...9 and 21 for correct pilot ame If the pilot ame does not touch the thermocouple then the main burner cannot function reliably See Figures 20 and 22 for incorrect shape of pilot ame MILLIVOLT CONTROL F...

Page 23: ...icating and shipping various components of this appliance are treated with certain oils lms or bonding agents These chemicals are not harmful but may produce annoying smoke and smells as they are burn...

Page 24: ...s supplier from a neighbor s phone Follow the gas supplier s instructions If you cannot reach your gas supplier call the re department C Use only your hand to push in or turn the gas control knob Neve...

Page 25: ...s Figure 25 Push in and hold control knob for 5 seconds NOTE If you are running the heater for the rst time it will be necessary to press in the control knob for 30 seconds to allow air to bleed out...

Page 26: ...elease the piezo ignitor button to light the pilot 8 Continue pushing the control knob in for a further 60 seconds to prevent the ame detector from shutting off the gas while the probe is warming up R...

Page 27: ...arts diagram for location of items discussed below Do not use cleaning uid to clean logs or any part of heater Brush logs with soft bristle brush or vacuum with brush attachment Vacuum loose particles...

Page 28: ...ff during use 1 Not enough fresh air is available for ODS pilot to operate 2 Low line pressure 3 ODS pilot is partially clogged 4 Defective Thermopile 5 Restrictions in incoming air ow 1 Open window a...

Page 29: ...sure is too low 1 Clean burner or replace burner ori ce 2 Replace burner ori ce 3 Contact quali ed service person Burner backfires during combustion 1 Manifold pressure is too low 2 Burner ori ce is c...

Page 30: ...livolt 11 Manual 12 14 13 13 ILLUSTRATED PARTS BREAKDOWN DYD24 18 Failure to position the parts in accordance with these diagrams or failure to use only parts speci cally approved with this appliance...

Page 31: ...gulator Valve 1 65D0013 65D0014 Manual Control Parts Not Shown Regulator to Valve Tube 1 65D0017 65D0017 Valve to Burner Tube 1 65D0018 65D0018 Pilot Tube 1 65D0019 65D0019 Millivolt Control 7 Injecto...

Page 32: ...ller in accordance with the installation instructions The Limited Lifetime Warranty will also be void if the appliance is not operated and maintained according to the operating instructions supplied w...

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