MHS Boilers DYD18 Installation And Operating Instructions Manual Download Page 17

65D0001 

17

Pipe Coupling

To Heater 

Valve

Gas Supply 

Inlet 

CONNECTING THE GAS

NOTICE: A qualified gas appliance installer must connect the heater to the gas supply. Consult all local 
codes.

IMPORTANT: 

Hold heater valve firmly with a wrench to prevent movement when connecting to inlet pipe. 

Manual Shutoff

Valve

Pipe

Stainless

Flexible Tube

Figure 13 - Gas Connection

Always use an external regulator for all propane/LPG heaters and high pressure one to two-pound systems only

, to 

reduce the supply tank pressure to a maximum of 13" w.c. This is in addition to the internal regulator in the heater valve.

Locations that 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 sulfide limits, and 
where permitted by local codes. Gas piping system must be sized to provide minimum 
inlet pressure (Listed on Data Plate) at the maximum flow rate (BTU/Hr). Undue pressure 
loss will occur if the pipe is too small.
A manual shutoff valve must be installed upstream of the appliance. Union tee and 
plugged 1/8" NPT pressure tapping point should be installed upstream of the appliance. 

See Figure 13.

CAUTION

CHECK GAS TYPE: 

The gas supply must be the same as stated on the heater’s rating 

plate. If the gas supply is different, DO NOT INSTALL THE HEATER. Contact your dealer 
for the correct model.

CAUTION

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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