Mr. Heater HS25NG/LP, MH25NG/LP Symptoms Causes Solutions, Replacing the GAS Valve Unit

Page 13

Table 4. Trouble Shooting Chart

Below in chart form are various symptoms of a malfunctioning system, possible defects that will cause these symp- toms and suggested corrective measures. The chart assumes that the proper gas pressure is available to the heater and that the lighting procedure is as stated on the plate attached to the heater.

SYMPTOMS

CAUSES

SOLUTIONS

 

 

 

burner light off very slow

partially block pilot orifice

replace

 

pilot out of adjustment

re-adjust pilot

 

 

 

burner light off very slow infra-red

partially blocked burner orifice

replace

color stays dull

 

 

 

 

 

burner flash back

low gas pressure

call your gas supplier

(roaring noise during operation

 

and ceramic grid surface will be

dark)

damaged burner

replace

 

 

 

ceramic grid or burner sooting up

first check for damaged burner

replace if damaged

(when new or after cleaning)

orifice

 

 

if burner orifice is not damaged

replace

 

then check for damaged manifold

 

 

 

 

pilot cannot be ignited

blocked pilot orifice

replace

 

gas cock not in position

gas cock knob must be

 

 

turned to pilot and held

 

 

depressed

 

pilot gas flow adjustment

open and adjust

 

screw may be closed

(see Figure 12)

 

 

 

pilot lights but goes out

defective thermocouple

replace

 

defective control

replace

 

 

 

pilot stays lit but main burner

loose wire or improperly wired

tighten connections, check

will not light

 

wiring diagram

 

defective control

replace

 

blocked burner orifice

clean orifice or replace

 

 

 

failure to ignite

main gas off

open manual valves

 

air in gas line

bleed gas line

 

loose wire connections

tighten wire connections

 

dirty wire connections

clean terminals and secure

 

 

terminals

 

 

 

3. REPLACING THE GAS VALVE UNIT

A.Remove the two gas valve unit wires at the gas control valve labeled “PP”.

B.Unscrew gas valve from gas piping.

C.Reconnect gas valve and unit wires to terminals “PP”. Be sure to leave thermostat wire on one terminal.

4.FREQUENCY OF OPERATOR CHECKS

Intermittent use. Appliances that are used seasonally should be checked before shutdown and again before the next use.

Dusty, wet or corrosive environment. Since these environments can cause the gas control to deteriorate more rapidly, the system should be checked more often.

The gas control should be replaced if:

A.It does not perform properly on checkout or trouble shooting.

B.The gas control knob Is hard to turn or push down, or it fails to pop back up when released.

Model # MH25NG/LP

HS25NG/LP

E13 Installation instructions and Owner’s Manual

Page 12 Page 14
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Page 12 Page 14
Contents English GAS Fired INFRA-RED Workshop HeaterSpanish FrenchTable of Contents Equipment Chapter IntroductionPurpose of Equipment See Tables 1 and 2 for heater specifications Heater Dimensions and Orifice SizesGeneral Information BTU Ratings and Supply PressuresGeneral Installation Information and Requirements Chapter Heater InstallationOnly Flue Side of Heater can Heater Side Reflector MustHeater Mounting Instructions Heater Mounting Information Piping Installation Connecting Heater to GAS SupplyGas Supply Requirements Piping RequirementsTypical Piping Installation Flame for Leak Testing Operating Safety Instructions Heater StartupChapter Heater Operating Instructions PressureLighting of Pilot Burner Heater ShutdownTroubleshooting Chapter Operator Maintenance InstructionsAdjusting the Pilot Flame ER Unit Beneath Cover ScrewReplacing the GAS Valve Unit Symptoms Causes SolutionsFrequency of Operator Checks Please do not Return this Appliance to Your Store If Service is RequiredALL Warranty Claims Require Proof of Purchase Chapter Replacement Parts ListFor Additional Information For Information Regarding Service or PartsQUÉ Hacer SI Detecta Olor a GAS Calentador Infrarrojo a GAS Para TallerIntoxicación por monóxido de carbono AdvertenciasAviso ÍndiceEquipo Capítulo IntroducciónFinalidad DEL Equipo Advertencias Información General Tabla 2. Dimensiones del calentador y tamaños de orificioTabla 1. Índices en BTU y presiones de suministro Número Tema relacionadoInformación Y Requisitos Generales DE Instalación Capítulo Instalación DEL CalentadorInstrucciones DE Montaje DEL Calentador Requisitos para el suministro de gas Conexión DEL Calentador AL Suministro DE GASInstalación de conductos Requisitos relativos a los conductosUSE UNA Cantidad Moderada DE Sellador Para Conductos Figura 7. Instalación característica de los conductos Encendido DEL CalentadorInstrucciones DE Funcionamiento Seguro Capítulo Instrucciones DE Funcionamiento DEL CalentadorNota Nota Capítulo Instrucciones DE Mantenimiento Para EL OperadorApagado DEL Calentador Reparación DE AveríasFigura 11. Ajuste correcto de la llama Ajuste DE LA Llama DEL PilotoCambio DE LA Unidad DE LA Válvula DE GAS Síntomas Causas SolucionesFrecuencia DE LOS Controles DEL Operador No Devuelva EL Artefacto a LA Tienda SI Debe RepararloCapítulo Lista DE Repuestos Advertencia Instruccionesde Funcionamientoy Manualdel UsuarioPara Obtener Información Sobre Reparación O Repuestos Para Obtener MÁS InformaciónEN Présence D’UNE Odeur DE GAZ Radiateur D’ATELIER À Infrarouge Alimenté AU GAZEmpoisonnement au monoxyde de carbone AvertissementsMise EN Garde Table DES MatièresÉquipement Chapitre IntroductionUtilisation DE L’ÉQUIPEMENT Avertissements Renseignements Généraux Tableau 2. Dimensions du radiateur et tailles des orificesTableau 1. Puissances en BTU et pressions d’alimentation LE Réflecteur Latéral DU Radiateur Doit Être Horizontal Chapitre Installation DU RadiateurPuissance Instructions DE Montage DU Radiateur Directives de montage du radiateur Connexion DU Radiateur À L’ALIMENTATION EN GAZ Installation des tuyauxExigences relatives à l’alimentation en gaz Exigences relatives à la tuyauterieCm 3 po Installation type de la TuyauterieConsignes DE Sécurité Chapitre RadiateurAllumage de la veilleuse Arrêt DU RadiateurDépannage Chapitre Directives D’ENTRETIEN ’INTENTION DE L’UTILISATEURRéglage DE LA Flamme DE LA Veilleuse Réglage AP Proprié DE LA 10 À 13 Millimètres FlammeRemplacement DE LA Soupape DE GAZ Symptômes Causes SolutionsFréquence DES Inspections PAR L’UTILISATEUR NE Retournez PAS CET Appareil À Votre Magasin SI UNE Réparation EST Nécessaire’ARTICLE DE Nomen Description Clature Informations SUR LA Commande DE Pièces

HS25NG/LP, MH25NG/LP specifications

The Mr. Heater HS25NG/LP and MH25NG/LP are reliable and efficient heating solutions designed for both residential and commercial spaces. These powerful units deliver warmth and comfort, making them ideal for garages, workshops, and outdoor settings.

One of the standout features of the HS25NG and MH25NG is their versatility in fuel options. The HS25NG is designed to use natural gas, while the MH25NG operates on propane, providing flexibility based on user needs and availability. This adaptability allows users to select the most convenient and cost-effective energy source for their heating requirements.

Both models are equipped with a robust heat output, with the capability to deliver 25,000 BTUs per hour. This level of performance ensures quick heating even in larger spaces, establishing a comfortable environment in minimal time. The units also feature a wide heating area that can efficiently cover spaces up to 600 square feet, making them suited for various applications.

User safety and efficiency are paramount in the design of these heaters. The HS25NG and MH25NG come with an automatic shutoff system that activates if the unit tips over or detects any obstruction to airflow. Additionally, they are equipped with a built-in piezo ignition system, enabling easy and reliable lighting without the need for matches or an external ignition source.

The heaters also incorporate advanced technology to optimize performance. Their infrared heating design allows for direct and efficient warmth, minimizing energy loss and ensuring that heat is directed where it's needed most. This not only enhances efficiency but can also lead to reduced energy costs over time.

Both models are designed with portability in mind, featuring a lightweight construction and convenient carry handle, making it simple to move the unit from one location to another as needed. The durable construction ensures that they can withstand the rigors of frequent use, whether it be in a workshop or an outdoor gathering.

In summary, the Mr. Heater HS25NG/LP and MH25NG/LP are powerful, versatile, and reliable heating solutions that combine advanced technology with user-friendly features. With their strong heat output, safety features, and option for both natural gas and propane, these heaters are an excellent choice for those looking for efficient heating in any environment.
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