Monessen Hearth MHSC EYF18 Installation And Operating Instructions Manual Download Page 15

65D1009 

15

Damper Stop

Damper

Figure 11 - Damper Stop Installation.

(See WARNING at top of next page.)

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. Use a heat resistant sealant. 

Do not seal the chimney flue damper.

INSTALLING VENTED APPLICATIONS

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 Since, the gas logs are operated with the damper open, non-combustible material 
and minimum mantel requirements do not apply.

BEFORE INSTALLING THE APPLIANCE:

  •  Turn off gas supply to fireplace or firebox.
  •   Have the fireplace floor and chimney professionally cleaned to remove ashes, soot, creosote or other obstructions. Have 

this cleaning performed annually after installation.

  •  Seal any fresh air vents or ash clean-out doors located on floor or wall of fireplace. If not, drafting may cause pilot out-

age or sooting. Use a heat-resistant sealant. Do not seal chimney flue damper.

Install and operate the appliance as directed in this 
manual.

DAMPER STOP INSTALLATION:

A damper stop must be provided with the unit. Contact 
your dealer to obtain one. The damper stop must be 
installed as shown in 

Figure 11 

to prevent full closure 

of the fireplace damper blade and provide a minimum 
29 square inch flue opening.

WARNING

This appliance is for installation only in a solid fuel burning fireplace (masonry fireplace 
or manufactured fireplace) with a working flue and constructed of noncombustible 
material.

Exception: 

DO NOT install this appliance in a factory-built fireplace that includes 

instructions stating that it has not been tested or should not be used with unvented 
gas logs. 

WARNING

Before installing in a solid fuel 
burning fireplace, The chimney flue 
and firebox must be cleaned of soot, 
creosote, ashes and loose paint by a 
qualified chimney cleaner. 

Summary of Contents for MHSC EYF18

Page 1: ...in 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 flammable vapors and liquids in the...

Page 2: ...eparation 15 Installing Vented Appliance 16 Connecting the Gas 17 Checking Gas Pressure 18 Electrical Wiring Millivolt 19 Log Placement 21 EYF24 F 21 EYF18 R 22 EYF24 R 23 Flame Appearance 24 Checking...

Page 3: ...he heater 6 Installation and repair should be done by a qualified service person 7 To prevent malfunction and or sooting an unvented gas heater should be cleaned before use and at least annually by a...

Page 4: ...tation 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...

Page 5: ...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 appliance un...

Page 6: ...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 maintain a standing pilot ON Valve position to turn ON OFF lo...

Page 7: ...stalled in that space An uncon fined space is defined 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 instal...

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: ...rth dimensions meet the minimum hearth dimensions shown below Figure 2 Hearth Minimum Dimension for Solid Fuel Burning Fireplaces and UL127 Factory Built Fireplaces Model A B C D EYF18 25 13 171 2 17...

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

Page 11: ...nsions shown in Figures 4 through 10 and defined in the fireplace manufacturer s instructions are minimum clearances to maintain when installing this heater Left and right clearances are determined wh...

Page 12: ...ombustible 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 thick...

Page 13: ...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: ...han 14 to the base of the fireplace 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 floor if a mini...

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

Page 16: ...ou must secure the gas log heater to the fireplace floor If not the entire unit may move when you adjust the controls Movement of unit may cause shifting of the gas logs which leads to sooting and imp...

Page 17: ...ns that the Pressure Tapping Point May Be CAUTION 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 hydrog...

Page 18: ...eading reinstall test plug Check for gas leaks MILLIVOLT CONTROL Figure 15 The valve regulator controls the burner pressure which should be checked at the pressure test point Turn captured screw count...

Page 19: ...At the other 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 or thermostat to wires on the unit Figure 16 Wiring Diagram Option...

Page 20: ...cked with a millivolt meter having a 0 1000 mV range Conduct each check shown in chart below by connect ing meter test leads to terminals as indicated Figure 17 Installing Remote Receiver Velcro Pads...

Page 21: ...ng of the log unit is critical to the safe and clean operation of this heater Sooting and other problems may result if the logs are not properly and firmly positioned in the appliance Never add additi...

Page 22: ...g 2 Rear Log 1 Middle Log 2 Front Log 3 Top Log 4 1 Place Rear Log 1 on rear support See Figure 19 2 Place Middle Log 2 on middle support See Figure 20 3 Place Front Log 3 in between burner and grate...

Page 23: ...24 2 Place Middle Log 2 on middle support See Figure 25 3 Place Front Log 3 in between burner and grate See Figure 26 4 Place Top Right Log 4 in bottom log cutouts See Figure 27 5 Rest Top Left Log 5...

Page 24: ...and 32 for correct pilot flame If the pilot flame does not touch the thermocouple then the main burner cannot function reliably See Figures 31 and 33 for incorrect shape of pilot flame MILLIVOLT CONT...

Page 25: ...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 a...

Page 26: ...lier from a neighbor s phone Follow the gas supplier s instructions If you cannot reach your gas supplier call the fire department C Use only your hand to push in or turn the gas control knob Never us...

Page 27: ...nning the heater for the first time it will be necessary to press in the control knob for 30 seconds to allow air to bleed out of the gas piping 7 With the control knob pushed in push and release the...

Page 28: ...the control knob pushed in push in and release the piezo ignitor button to light the pilot 8 Continue pushing the control knob in for a further 60 seconds to prevent the flame detector from shutting o...

Page 29: ...NING See parts diagram for location of items discussed below Do not use cleaning fluid to clean logs or any part of heater Brush logs with soft bristle brush or vacuum with brush attachment Vacuum loo...

Page 30: ...uring 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 flow 1 Open window and...

Page 31: ...is too low 1 Clean burner or replace burner orifice 2 Replace burner orifice 3 Contact qualified service person Burner backfires during combustion 1 Manifold pressure is too low 2 Burner orifice is c...

Page 32: ...10 7 Millivolt 8 ILLUSTRATED PARTS BREAKDOWN Failure to position the parts in accordance with these diagrams or failure to use only parts specifically approved with this appliance may result in proper...

Page 33: ...1 65D1005 65D1005 65D1006 65D1006 Pilot Tube 1 49D0050 49D0050 49D0050 49D0050 Pilot Regulator 1 14D0469 14D0469 Millivolt Control 3 Injector 1 58D0051 20H3144 57D0209 57D0612 4 ODS Pilot Assembly 1 1...

Page 34: ...ght Log 1 65D0009K EYF24 F Item Description Qty EYF18 R 1 Rear Log 1 65D1036K 2 Middle Log 1 65D1037K 3 Front Log 1 65D1038K 4 Top Log 1 65D1039K Item Description Qty EYF24 R EYF30 R 1 Rear Log 1 65D1...

Page 35: ...irements provided however that during said thirty 30 day period a battery operated carbon monoxide detector with an alarm shall be installed Massachusetts Residents Only Please read and follow these s...

Page 36: ...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 with the appliance a...

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