A.O. Smith 315795-000 MH, FMD 40, FMD 50, FMD 30 instruction manual TEMPERATURE-PRESSURE Relief Valve

Page 15

T&P Relief Valve Insulation

Manual Relief Lever

T&P Relief Valve

Drain Line

FIGURE 25.

TEMPERATURE-PRESSURE RELIEF VALVE

•Temperature-pressure relief valve must comply with ANSI Z21.22- CSA 4.4 and ASME code.

•Properly sized temperature-relief valve must be installed in opening provided.

•Can result in overheating and excessive tank pressure.

•Can cause serious injury or death.

This heater is provided with a properly certified combination temperature - pressure relief valve by the manufacturer.

The valve is certified by a nationally recognized testing laboratory that maintains periodic inspection of production of listed equipment of materials as meeting the requirements for Relief Valves and Automatic Gas Shut-off Devices for Hot Water Supply Systems, ANSI Z21.22 • CSA 4.4.

If replaced, the valve must meet the requirements of local codes, but not less than a combination temperature and pressure relief valve certified as indicated in the above paragraph.

The valve must be marked with a maximum set pressure not to exceed the marked hydrostatic working pressure of the water heater (150 psi = 1,035 kPa) and a discharge capacity not less than the water heater input rate as shown on the model rating plate.

For safe operation of the water heater, the relief valve must not be removed from its designated opening nor plugged.

The temperature-pressure relief valve must be installed directly into the fitting of the water heater designed for the relief valve. Position the valve downward and provide tubing so that any discharge will exit only at any distance below the structural floor and external to the building. In cold climates, it is recommended that the discharge pipe be terminated at an adequate drain inside the building. Be certain that no contact is made with any live electrical part. The discharge opening must not be blocked or reduced in size under any circumstances. Excessive length, over 30 feet (9.14 m), or use of more than four elbows can cause restriction and reduce the discharge capacity of the valve, see Figure 26.

No valve or other obstruction is to be placed between the relief valve and the tank. Do not connect tubing directly to discharge drain unless a 6 inch (15 cm) air gap is provided. To prevent bodily injury, hazard to life, or property damage, the relief valve must be allowed to discharge water in quantities should circumstances demand. If the discharge pipe is not connected to a drain or other suitable means, the water flow may cause property damage.

The Discharge Pipe:

•Shall not be smaller in size than the outlet pipe size of the valve, or have any reducing couplings or other restrictions.

•Shall not be plugged or blocked.

•Shall be of material listed for hot water distribution.

•Shall be installed so as to allow complete drainage of both the temperature-pressure relief valve, and the discharge pipe.

•Shall exit only at any distance below the structural floor and external to the building. In cold climates, it is recommended that the discharge pipe be terminated at an adequate drain inside the building.

•Shall not have any valve between the relief valve and tank.

The temperature-pressure relief valve must be manually operated at least once a year. Caution should be taken to ensure that (1) no one is in front of or around the outlet of the temperature-pressure relief valve discharge line, and (2) the water manually discharged will not cause any bodily injury or property damage because the water may be extremely hot.

If after manually operating the valve, it fails to completely reset and continues to release water, immediately close the cold water inlet to the water heater, follow the draining instructions, and replace the temperature-pressure relief valve with a new one.

FIGURE 26.

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Contents For USE only in Manufactured Homes Residential Direct Vent GAS Water HeatersImportant Definitions Safe INSTALLATION, USE and ServiceGeneral Safety Introduction Table of ContentsThermostat Shield Optional Typical InstallationHotter Water can Scald Facts to Consider about the Location Locating the NEW Water HeaterInsulation Blankets Water Heater Installation Installing the NEW Water HeaterBasement or crawl space Securing Water Heater to Floor and WallRoof Jack Installation ALL Models ALL 50 Gallon 189.27 Liter ModelsHRS Movement Complete Joint SETValve and Pipe Insulation Water PipingTEMPERATURE-PRESSURE Relief Valve GAS Piping Filling the Water HeaterFor 50 Gallon Heater Sediment TrapsFor 30 Gallon Heater For 40 Gallon HeaterPage For 30 Gallon Heater Page Condensate Temperature RegulationFor Your Information Start UP ConditionsOperational Conditions Burner Inspection Periodic MaintenanceBurner Cleaning Venting System InspectionImmediately correct any if found Anode ROD InspectionDraining Water system. Check for any leaksDrain Valve Washer Replacement ServiceLeakage Checkpoints Troubleshooting Guidelines Metal Drain PAN Thermostat Shield Manifold Assembly Repair Parts ListPage Page UNE NON ET Rechange DE Pièces DE Liste UNE EST Ceci Rechange DE Pièces DES ListeSuie DE Formation Dépannage DE DirectivesTrop PAS LA DE Rondelle LA DE RemplacementFuites DE Vérification DE Points Vidange DE Soupape’ANODE Tige LA DE Inspection Brûleur DU Nettoyage .37 Figure Périodique EntretienEntretien Brûleur DU InspectionFonctionnement DE Conditions Condensation Information Votre PourTempérature LA DE Régulation Démarrage DE ConditionsMort la ou corporelles blessures des matériels ’APPAREIL Vers GAZ LE CouperEAU-CHAUFFE Gallons 30 Pour Naturel GAZ AU .L.P Propane GAZ DUGallons 50 DE EAU-CHAUFFE UN Pour Gallons 40 DE EAU-CHAUFFE UN PourVoir basse, plus la position sa à Droite la vers tourné 19 à 9 étapes lesCe jusqu’à 30 FigureModèle DU Signalétique Plaque LA SUR Listé Celui QUE Sédiments À TrappesGallons 30 DE EAU-CHAUFFE UN Pour Et eau,-chauffe le dessert qui gaz en d’alimentation Remplacement le requiert Ceci .supplémentaire pieds 000 1 mGAZ DE Conduite EAU-CHAUFFE LE RemplirPression DE ET Température DE Décharge DE Soupape Potable non d’eau système un à pas connectez Ne Prudence’EAU Canalisation DE Réseau Tuyaux DES Isolation ET P & T DE SoupapeComplet Joint DU Tableau JEU Mouvement DE Joints DES Pour Approximatif Prise DE TempsRaccords LES ET Cpvc OU ABS PVC, Tuyau LE Cimenter Gallons 50 Litres 189,27 Modèles LES Tous Modèles LES TousPente en toit un sur utilisation Cheminée DE Trémie LA DE InstallationMUR AU ET Plancher AU EAU-CHAUFFE LE Fixer EAU-CHAUFFE DU Installation EAU-CHAUFFE Nouveau LE InstallerBlankets Insulation De l’air blessures, des éviter PourDétectée est fuite la lorsque Respectés être doivent EAU-CHAUFFE Nouveau DU L’EMPLACEMENT Choisir’EMPLACEMENT DE Sujet AU Considérer À Faits » eau-chauffe nouveau le Installer « section la dansÉbouillanter Peut Chaude Plus L’EAU DE Typique InstallationGAZ AU Modèles EAU-CHAUFFE Votre Connaissez Matières DES Table ’INSTALLATION Pour Préparer SEGénérale Sécurité Importantes Définitions Entretien ET Utilisation .SÉCURITAIRE Installation000-15795 Pièce DE .NO Unis-États AUX Imprimé EAU-CHAUFFE LE SUREAU-CHAUFFE CE PAR Utilisé GAZ AU Ajouté EST Odorisant UN

FMD 40, FMD 50, 315795-000 MH, FMD 30 specifications

A.O. Smith is a renowned brand in the field of water heating solutions, offering a range of efficient and durable water heaters tailored to meet diverse consumer needs. Among its extensive lineup, the A.O. Smith FMD series showcases several commendable models, including the FMD 30, FMD 40, and FMD 50, each boasting unique features and advanced technologies.

The A.O. Smith FMD 30 is a compact water heater designed for smaller households or limited spaces. With a 30-gallon capacity, it is engineered to provide ample hot water for everyday needs such as bathing, washing dishes, and laundry. The heater employs advanced insulation technology, ensuring heat retention and energy efficiency. The thermostatic control system allows users to easily adjust the water temperature to their preference, ensuring comfort while promoting safety.

Moving to the A.O. Smith FMD 40, this model offers an increased capacity of 40 gallons, making it an ideal choice for medium-sized families. It incorporates A.O. Smith’s cutting-edge Durapower glass coating, which protects the tank from corrosion, ultimately extending its lifespan. The FMD 40 also features an enhanced heating element design that ensures rapid heating and consistent water temperature, making it perfect for bustling households.

The A.O. Smith FMD 50 takes things a step further, providing 50 gallons of hot water storage and designed for larger families or high-demand applications. This model integrates advanced technology features like a smart thermal control system that optimizes energy usage, ensuring that hot water is available when you need it without unnecessary power consumption. With robust construction materials, the FMD 50 is built to last, even in harsh conditions.

All models in the A.O. Smith FMD series prioritize user convenience. They come equipped with easy-to-read digital displays for monitoring temperature and status, along with built-in safety features such as automatic shut-off mechanisms. Installation is straightforward, and each unit adheres to energy efficiency standards, which help reduce utility bills while being environmentally friendly.

In summary, the A.O. Smith FMD series, including the FMD 30, FMD 40, and FMD 50, represents a commitment to quality and innovation. With their varying capacities and advanced technologies, these water heaters cater to a wide range of household needs, delivering reliable hot water solutions while maintaining energy efficiency and durability. Investing in an A.O. Smith FMD water heater not only guarantees comfort but also highlights a commitment to sustainability.
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