Mr. Heater MHU 80, MHU 50 Horizontal Venting Commercial, Horizontal Venting Residential

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5.Vent termination must be a minimum of 4’ (1.2m) below or 4’ (1.2m) horizontally from any soffit vent or under-eave vent.

6.Vent must be a minimum of 6’ from an inside corner formed by two exterior walls. If possible, leave a 10’ clearance.

7.Vent termination must be a minimum of 10’ (3m) from any forced air inlet (includes fresh air inlet for other appliances, such as a dryer).

8.When termination is routed through an exterior combustible wall the vent must be supported using a listed clearance thimble. Seal the connection between the single wall and double wall pipes and the annular space of the double wall pipe as shown in figure 2. Inside edge of vent termination tee must be at least 12 inches from outside wall as shown in figure 3.

9.For horizontal venting, the vent pipe shall be supported with hangers no more than 3ft. (1m) apart to prevent movement after installation.

D – HORIZONTAL VENTING – COMMERCIAL

1.Horizontal commercial installations are for buildings which are not attached to living spaces. The vent may be single wall vent material installed according to the sections

Venting A - General Recommendations and Requirements and C - Horizontal Venting General and D - Horizontal Venting - Commercial. Refer to figure 3.

2.The vent pipe diameter for horizontal commercial installations shall be 4” (76mm) on 50 units. In all cases, a flue transition piece (supplied) is required to fit over the outlet of the induced draft assembly on the appliance.

3.Refer to table 2 for maximum vent connector lengths.

4.Select a wall termination point that will maintain ¼” rise per foot slope of horizontal run of vent pipe.

5.For upward sloped vent a condensate tee and drain must be installed within the first 5’ (1.5m) from the unit heater to protect the appliance. If a flexible condensate drain line is used, the drain line must include a loop entering the structure. If the unit is shut down for an extended period of time and will be exposed to sub-freezing temperatures, the condensate may freeze.

E – HORIZONTAL VENTING – RESIDENTIAL

1.For horizontal residential installations these units are certified as Category III appliances. Venting A - General Recommendations and Requirements and C - Horizontal Venting General and E - Horizontal Venting - Residential.

Refer to figure 6.

2.The vent pipe diameter for horizontal residential installations shall be 4” (100mm) on 50 and 80 units. A standard vent transition is required at unit in addition to the transition supplied with the unit.

3.The maximum vent length is 5’ (1.5m) plus one 90-degree elbow. The minimum length is 3’(.91m).

4.The vent must maintain a ¼” rise per foot of slope upwards toward the termination.

CONDENSATE DRAIN THROUGH TEE PIPE AND DRAIN LOOP

UPWARD SLOPE ON HORIZONTAL VENT-COMMERCIAL INSTALLATION

CATEGORY III VENT ACCORDING TO THESE INSTALLATION INSTRUCTIONS.

SLOPE: + 1/4 INCH FOR 1 FOOT RUN MINIMUM.

FLUE TRANSITION

(PROVIDED)

LISTED THIMBLE

THROUGH COMBUSTIBLE

WALL

INDUCED DRAFT BLOWER

NOTE - MINIMUM HORIZONTAL LENGTH 3 FT. (914MM),

 

NOT INCLUDING CAP FOR TERMINATION. REFER TO TABLE

DRAIN LOOP WITH WATER

2 FOR MAXIMUM LENGTH AND NUMBER OF ELBOWS.

TRAP (TO CONDENSATE DRAIN)

12 INCHES MIN.

(30.5 CM)

EXHAUST VENT

TERMINATION TEE

12” (30.5 CM)

MINIMUM ABOVE ALL HIGHEST SNOWFALL

COMMON VENTING NOT ALLOWED WHEN HORIZONTALLY VENTING THE UNIT / UTILITY HEATER

FIGURE 3

Compact Unit / Utility Heater

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Operating Instructions and Owner’s Manual

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Contents MR. HEATER, INC., 4560 W TH ST., CLEVELAND, Ohio 44135 For Your SafetyGeneral Hazard Warning ContentsSide View MHU 50/MHU 80 Unit DimensionsDimension TOP ViewRequirements CSA in Canada Garage InstallationsShipping Requirements CSA in the USAGeneral Recommendations and Requirements Unit Heater InstallationCombustion and Ventilation AIR VentingVent Termination on Single Wall Vent Horizontal Venting GeneralHorizontal Venting Residential Horizontal Venting CommercialCondensate Drain Through TEE Pipe and Drain Loop Horizontal Venting Residential Installation Venting Using a Masonry ChimneyRemoval of Unit from Common Vent GAS Supply to Unit Heater Line Voltage Field WiringElectrical Connections GAS Supply ConnectionUnit START-UP Leak CheckStart UP and Operation GAS ConnectionAdjustments Service Optional Thermostat Installation Ladder DiagramFailure to Operate Repair PartsElectrical Flue and ChimneySee Back page for Parts Ordering Information Parts ListLimited Warranty For Information Regarding ServiceParts Ordering Information Para SU Seguridad Instrucciones DE USO Y Manual DEL UsuarioContenido AdvertenciaEL Estado DE California Exige LAS Siguientes Advertencias Dimensión Dimensiones DE LAS Unidades MHU 50/MHUVista Superior Vista PosteriorInstalaciones EN Garaje EnvíoRequisitos CSA EN EE. UU Requisitos CSA EN CanadáRequisitos Y Recomendaciones Generales Aire DE Combustión Y VentilaciónVentilación Instalación DEL CalentadorVentilación Horizontal General Ventilación Horizontal Residencial Ventilación Horizontal ComercialQuitar LA Unidad DE UNA Ventilación Común Ventilación CON UNA Chimenea DE MamposteríaVentilación Horizontal Instalación Residencial Cableado DEL Inductor DE Voltaje DE Línea Conexiones EléctricasEncendido DE LA Unidad Conexión DE GASVerificación DE Fugas Encendido Y FuncionamientoAjustes Mantenimiento Instalación DEL Termostato Opcional Diagrama DE EscalonesFalla DE Funcionamiento Soplador DE Aire DE CombustiónSistema Eléctrico GAS DE Combustión Y ChimeneaVER AL Dorso LA Información Para Ordenar Partes Lista DE PiezasSI Desea Obtener Información Acerca DE Reparaciones Información Para Realizar Pedidos DE PiezasGarantía Limitada Pour Votre Sécurité Guide D’UTILISATION ET Manuel DU PropriétaireTable DES Matières AvertissementAvertissement Général DE Danger VUE EN Plan Dimension DES Appareils MHU 50/MHUExigences CSA AU Canada Installations Dans UN GarageExpédition Exigences CSA AUX É.-UAppareil DE Chauffage / Radiateur Utilitaire Exigences ET Recommandations GénéralesVentilation AIR DE Combustion ET DE VentilationVentilation Horizontale Générale Ventilation Horizontale Commerciale Ventilation Utilisant UNE Cheminée EN Maçonnerie Ventilation Horizontale Installation RésidentielleRetrait DUN Appareil DE LA Ventilation Commune Alimentation EN GAZ Vers Lappareil DE Chauffage Connexions ÉlectriquesCâblage SUR Place À LA Tension DE Ligne Raccordement À Lalimentation EN GAZDémarrage DE Lappareil Avertissement Raccordement AU GAZVérification DE Fuites DE GAZ Démarrage ET FonctionnementRéglages Entretien ET Réparation Installation DU Thermostat EN Option Diagramme EN EscalierLappareil NE Fonctionne PAS Ventilateur DE Lair DE CombustionCircuit Électrique Conduit DE Cheminée ET Cheminée50 000 et 80 000 BTU F260163 Liste DES Pièces50 000 et 80 000 BTU F260164 Garantie Limitée Informations SUR LA Commande DE PiècesFournisseur DE Services Dentretien Qualifié Pour Plus D’INFORMATIONS Concernant L’ENTRETIEN