Mr. Heater MH25LP / MH25NG Connecting Heater to GAS Supply, Gas Supply Requirements

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THERMOSTAT

POWERPILE GAS VALVE

POWERPILE GENERATOR

Figure 4. Connection Diagram

Refer to National Electrical Code NFPA70-1993 and for Canadian installations to current CODE C22.1-

3. CONNECTING HEATER TO GAS SUPPLY

WARNING: Depending on local codes and require- ments and the installer’s skill level, the sizing and installation of gas lines required to safely and efficiently supply the heater may require the assistance of a professional. If in doubt as to these requirements, discuss the requirements of this manual with the dealer from whom the heater was purchased and your gas supplier.

3.1Gas Supply Requirements

•See Tables 1 and 2 for gas supply minimum, maximum, operating, and manifold pressures for both heater models. Pressures are provided in inches of W.C. (water column). Also, see heater rating plates located on the heater.

WARNING: Model MH/HS25NG is designed to burn natural gas and it comes equipped with a regulator. The regulator is built into the gas valve. The maximum inlet pressure to this regulator is 1/2 psi (14 in. W.C.) If gas line pressure exceeds 1/2 psi, then an additional regulator must be installed before the heater/regulator to step down the pressure to a maximum of 1/2 psi.

•Most residential natural gas services provide a line pressure of 4 oz. (6.9 in. W.C.). If in doubt consult your natural gas supplier.

•To ensure the best performance from your natural gas heater make sure the supply manifold pres- sure is at least 6" W.C.

WARNING: Model MH/HS25LP is designed to burn liquefied petroleum (LP) gas and it comes equipped with a regulator. The regulator is built into the gas valve. The maximum inlet pressure to this regulator is 1/2 psi (14 in. W.C.). If gas line pressure exceeds 1/2 psi, then an additional regulator must be installed before the heater/regulator to step down the pressure to a maxi- mum of 1/2 psi.

•To ensure the best performance from your LP gas heater, make sure the supply manifold pressure is at least 1/2 psi (14 in W.P.).

3.2Piping Requirements

All piping installed must comply with local codes and ordinances or with National Fuel Gas Code,

ANSI Z223.1 (NFPA 54), whichever takes precedence. When installing piping, the following requirements must be taken into consideration: Canadian installations must comply with the B149.1.2 Gas Code.

•Use new properly reamed black pipe free from chips.

•Apply a good quality pipe compound to all male threads as shown in Figure 5 prior to assembly. If LP gas is the fuel, ensure that pipe compound is resistant to LP gas. Do not use Teflon™ tape.

USE MODERATE AMOUNT OF PIPE DOPE

LEAVE 2 THREADS BARE

Figure 5. Pipe Compound Application

•Male threads on pipe to be installed into gas valve shall meet the requirements of Figure 6. Threads longer than those shown in the figure may cause gas valve distortion and malfunction.

•A sediment trap meeting the typical requirements of Figure 7 shall be installed in the line to the gas valve.

•A dedicated shutoff valve for the heater must be installed in the gas supply line.

3.3Piping Installation

While ensuring that all of the above gas supply require-

3/4” MAXIMUM

THREAD LENGTH 1/2” BLACK PIPE

GAS VALVE BODY

1/2” MAXIMUM DEPTH OF INSERTS INTO GAS VALVE

Figure 6. Gas Valve Connection Requirements

Model # MH25NG/LP

HS25NG/LP

8 Installation instructions and Owner’s Manual

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Contents GAS Fired INFRA-RED Workshop Heater What to do if YOU Smell GASTable of Contents Chapter Introduction EquipmentPurpose of Equipment Models Covered in this ManualHeater Dimensions and Orifice Sizes General InformationBTU Ratings and Supply Pressures NfpaChapter Heater Installation General Installation Information and RequirementsOnly Flue Side of Heater can be Elevated 30o Heater Side Reflector Must be HorizontalHeater Mounting Instructions Heater Mounting Information Connecting Heater to GAS Supply Piping InstallationGas Supply Requirements Piping RequirementsTypical Piping Installation Pressure Operating Safety Instructions Heater StartupChapter Heater Operating Instructions Heater Shutdown Lighting of Pilot BurnerChapter Operator Maintenance Instructions TroubleshootingAdjusting the Pilot Flame InletSymptoms Causes Solutions Replacing the GAS Valve UnitFrequency of Operator Checks Gas control knob Is hard to turn or push down, orPlease do not Return this Appliance to Your Store If Service is RequiredChapter Replacement Parts List ALL Warranty Claims Require Proof of Purchase Keep this warranty Can 1-2.16-M81 Ansi Z83.6b-1993Garantie cette Conservez 1993-6b.Z83 AnsiM81-16.2-1 can Clature Description Nomen DE N ’ARTICLE N Magasin Votre À Appareil CET PAS Retournez NE Rechange DE Pièces DES Liste V ChapitreNécessaire EST Réparation UNE SI GAZ DE Soupape LA DE Remplacement Solutions Causes SymptômesSi remplacée être doit gaz de commande La ’UTILISATEUR PAR Inspections DES FréquenceFlamme La de approprié Réglage .11 Figure DépannageDu dissipation la permettre pour minutes 5 Attendez Veilleuse la de Allumage .10 FigureRadiateur DU Arrêt Remarque Manuelle GAZ DE Commande DE Bouton Radiateur DU D’UTILISATION Notice III ChapitreGaz de soupape la de Composants .9 Figure Sécurité DE ConsignesTuyauterie la de type Installation .7 Figure Cm 7,6GAZ EN L’ALIMENTATION À Radiateur DU Connexion Câblage de Schéma .4 FigureJoint À Pâte DE Modérée Quantité UNE Utilisez Radiateur du montage de Directives .3 Figure Figure LA VoirRadiateur DU Montage DE InstructionsPuissance Radiateur DU Installation II ChapitreRelativement Exigences ET Généraux Renseignements Orifices des tailles et radiateur du Dimensions .2 Tableau ’alimentation pressions et BTU en Puissances .1 TableauGénéraux Renseignements NfpaIntroduction I Chapitre Guide DU UtilisationGuide Présent LE Dans Décrits Modèles ’ÉQUIPEMENT DE UtilisationMatières DES Table Garde EN MiseCarbone de monoxyde au Empoisonnement AvertissementsGAZ AU Alimenté Infrarouge À Telier D’ Teur Radi a GAZ DE Odeur D’UNE Présence EN

MH25LP / MH25NG specifications

The Mr. Heater MH25LP and MH25NG portable heaters are designed for anyone looking to efficiently heat small to medium-sized spaces, whether indoors or outdoors. These heaters are known for their reliability and effectiveness, making them popular choices for residential use, outdoor activities, and emergency heating scenarios.

The MH25LP is the propane model, while the MH25NG utilizes natural gas, providing versatility in fuel options to cater to different preferences and availability. Each unit is fitted with essential safety features, including an oxygen depletion sensor and an accidental tip-over shutdown system, ensuring peace of mind during use.

One of the main features of the Mr. Heater MH25 series is its impressive heating capacity. The units can produce up to 25,000 BTU per hour, sufficient for heating spaces up to 600 square feet, making them ideal for workshops, garages, cabins, and various outdoor activities. The adjustable heat settings allow users to customize the temperature to suit their comfort level, maximizing efficiency and reducing fuel consumption.

The design of the MH25 heaters emphasizes user convenience. Both models are lightweight and portable, which allows for easy transportation from one location to another. They come equipped with comfortable carrying handles, enhancing their usability for outdoor events, camping trips, or simply moving from room to room.

Another significant feature of the Mr. Heater MH25 series is the sophisticated combustion technology employed. The heaters utilize a radiant heating system that effectively warms objects and people in the room rather than just the air, leading to faster heating times and a more comfortable environment. Additionally, the units are designed with a sturdy and durable construction that ensures longevity, withstanding the rigors of outdoor use.

The units are also designed to operate quietly, making them an excellent choice for environments where noise levels need to be kept to a minimum, such as in personal workshops or while camping.

Overall, the Mr. Heater MH25LP and MH25NG are powerful, safe, and portable heating solutions that provide reliable warmth and comfort in various settings. Their combination of efficient heating, portable design, and safety features makes them an essential tool for anyone needing reliable heating solutions. Whether for everyday use or special events, these heaters stand out as dependable options to keep warm.
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