Lochinvar MFH-I Service Manual

INSTALLATION & SERVICE MANUAL

MANUFACTURED HOME (MOBILE HOME)

GAS WATER HEATER

WARNING

If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury or death.

FOR YOUR SAFETY Do not store or use gasoline or other flammable, combustible, or corrosive vapors and liquids in the vicinity of this or any other appliance.

MFH-I&S-02

This water heater must be installed in accordance with local codes. In the absence of local codes, it must be installed in compliance with The Federal Manufactured Home Construction and Safety Stand Title 24 CRF, part 3280 or CAN/CSA Z240 MH series, mobile home. In the absence of such standard, The Standard for mobile Homes (ANSI/NFPA No. 601B-1977).

This water heater is of the closed combustion type (direct venting) where all the combustion air is supplied from the outdoors through the air intake and all combusted gas products are vented directly to the outside by means of the roof jack. No draft diverter (vent hood) is required for this water heater.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch; do not use any telephone in your building.

• Immediately call your gas supplier from a neighbor’s telephone. Follow the gas supplier’s instructions.

• If you cannot reach your gas supplier, call the fire department.

Installation and service must be performed by a qualified installer, service agency or the gas supplier.

For your family’s comfort, safety and convenience, we recommend this water heater be installed and serviced by a plumbing professional.

TABLE OF CONTENTS

GENERAL INFORMATION .......................................................... 1

INSTALLATION .....................................................................2

Locating The Water Heater ............................................... 2

Minimum Clearances .........................................................2

Venting ........................................................................... 3

Combustion Air Supply .....................................................3

Water Connections .......................................................... 4

Gas Connections .............................................................. 5

Gas Conversion Instructions .............................................5

GENERAL OPERATION ..............................................................6

Lighting and Shutdown Instructions.................................. 6

Thermostat Adjustment ....................................................7

Burner Flame Check .......................................................... 7

MAINTENANCE ........................................................................ 7

TYPICAL INSTALLATION INSTRUCTIONS ..................................... 8

Underwriters Laboratories, Inc. has tested a representative sample of this water heater design for its safety of operation. The ULA listing of this water heater includes the field installation of the following components: roof jack, leg enclosure (optional), air intake tube (optional), and heater tie down materials. These components for field installation may have been shipped with this heater and must be installed according to the instructions (see page 8). No other components are approved for use with this water heater.

This water heater has been designed and certified for the purpose of heating potable water. The installation and use of this water heater for any purpose other than the heating of potable water may cause damage to the water heater, create a hazardous condition, and nullify the warranty.

CAUTION

Incorrect operation of this appliance may create a hazard to life and property and will nullify the warranty.

Do not use this appliance if any part has been submerged in water. You should contact the plumbing professional who installed the water heater to inspect the appliance and to replace any part of the control system including the combination gas control which has been submerged in water.

DANGER

Do not store or use gasoline or other flammable, combustible, or corrosive vapors and liquids in the vicinity of this or any other appliance.

IMPORTANT

Before proceeding, please inspect the water heater and components for possible damage. DO NOT install any damaged components. If damage is evident then please contact the supplier where the water heater was purchased or the manufacturer listed on the rating plate for replacement parts.

GENERAL INFORMATION

This gas-fired water heater is design certified by underwriter’s laboratories in accordance with the HUD Manufacturer Home Construction and Safety Standard, Title 24, part 3280.

The warranty for this water heater is in effect only when the water heater is installed, adjusted, and operated in accordance with these Installation and Operating Instructions. The manufacturer will not be liable for any damage resulting from alteration and/or failure to comply with these instructions.

This water heater has been manufactured for operation at altitudes from sea level to 2000 feet (610m) (unless otherwise specified on the water heater rating plate). For use of this appliance at an elevation greater than 2000 feet (610m), contact the dealer or manufacturer listed on the rating plate for information on any necessary modification. Uncorrected operation of this appliance may create a hazard to life and property.

MFH-I&S-02

Make sure that you check the rating plate and combination gas control on the water heater to be certain that the type of gas being supplied corresponds with the marking on the rating plate and combination gas control.

A sacrificial anode is used to extend tank life. The removal of this anode, for any reason, will nullify the warranty. In areas where water is unusually active, an odor may occur at the hot water faucet due to a reaction between the sacrificial anode and the impurities in the water. If this should happen, an alternative anode may be purchased from the supplier that installed this water heater. This will minimize the odor while protecting the tank. Additionally, the water heater should be flushed with appropriate dissolvers to eliminate any bacteria.

INSTALLATION

Locating The Water Heater

WARNING

Water heaters are heat producing appliances. To avoid damage or injury there shall be no materials stored against the water heater or vent-air intake system and proper care shall be taken to avoid unnecessary contact (especially by children) with the water heater and vent-air intake components. UNDER NO CIRCUMSTANCES

SHALL FLAMMABLE MATERIALS, SUCH AS GASOLINE OR PAINT THINNER BE USED OR STORED IN THE VICINITY OF THIS WATER HEATER, VENT-AIR INTAKE SYSTEM OR IN ANY LOCATION FROM WHICH FUMES COULD REACH THE WATER HEATER OR VENT-AIR INTAKE SYSTEM.

This water heater shall NOT be installed in any location where gasoline or flammable vapors are likely to be present, unless the installation is such to eliminate the probable ignition of gasoline or flammable vapors.

The location of this water heater is of the utmost importance. Before installing this water heater, you should read the Installation section of these instructions. DO NOT locate the water heater where water lines could be subjected to freezing temperatures. Make sure the cold water pipes are not located directly above the gas control so that condensate during humid weather does not drip on the controls.

Water heater corrosion and component failure can be caused by the heating and breakdown of airborne chemical vapors. Examples of some typical compounds that are potentially corrosive are: spray can propellants, cleaning solvents, refrigerator and air conditioning refrigerants, swimming pool chemicals, calcium and sodium chloride, waxes and process chemicals. These materials are corrosive at very low concentration levels with little or no odor to reveal their presence. NOTE: DAMAGE TO THE WATER HEATER CAUSED BY

EXPOSURE TO CORROSIVE VAPORS IS NOT COVERED BY THE WARRANTY. DO NOT OPERATE THE WATER HEATER IF EXPOSURE HAS OR WILL OCCUR. DO NOT STORE ANY POTENTIALLY CORROSIVE COMPOUNDS IN THE VICINITY OF THE WATER HEATER.

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch; do not use any telephone in your building.

• Immediately call your gas supplier from a neighbor’s telephone. Follow the gas supplier’s instructions.

• If you cannot reach your gas supplier, call the fire department.

WARNING

DO NOT ATTEMPT TO LIGHT ANY GAS APPLIANCE IF YOU ARE NOT CERTAIN OF THE FOLLOWING:

• Liquefied petroleum gases/propane gas and natural gas have an odorant added by the gas supplier that aids in detection of the gas.

• Most people recognize this odor as a “sulfur” or “rotten egg” smell.

• Other conditions, such as “odorant fade” can cause the odorant to diminish in intensity, or “fade”, and not be as readily detectable.

• If you have a diminished sense of smell, or are in any way unsure of the presence of gas, immediately contact your gas supplier from a neighbor’s telephone.

• Gas detectors are available. Contact your gas supplier or plumbing professional for more information.

This water heater must be located in an area where leakage of the tank, water line connections, or the combination temperature and pressure relief valve will not result in damage to the area adjacent to the water heater or to lower floors of the structure. When such locations cannot be avoided, a suitable drain pan must be installed under the water heater. The drain pan must be no greater than 1-½ inches (3.8 cm) deep and have a minimum length and width of at least 4 inches (10.2 cm) measured from the jacket of the water heater. The drain pan, as described above, can be purchased from your plumbing professional. The drain pan must be piped to an adequate drain. The piping must be at least 3/4 inch (1.9 cm) in diameter and pitched for proper drainage.

It is recommended that a minimum clearance of 4 inches (10.2 cm) be provided on the side of the water heater for servicing and maintenance of the combination temperature and pressure relief valve.

MINIMUM CLEARANCES

WARNING

Failure to adhere to these installation and operating instructions may create a hazard to life and property and will nullify the warranty.

For exact venting specifications, please consult the Venting section, located on page 3, of these Installation and Operating Instructions.

WARNING

Liquefied petroleum gases/propane gas are heavier than air and will remain at floor level if there is a leak. Basements, crawl spaces, closets and areas below ground level will serve as pockets for accumulation of leaking gas. Before lighting, smell all around the appliance area for gas. Be sure to smell next to the floor.

This installation shall allow access to the front of the water heater and adequate clearance shall be provided for servicing and operating this water heater. The water heater may be installed on either a combustible or non-combustible floor. If the water heater is to be installed directly on carpeting, it shall be installed on top of a metal or wood panel (or equivalent) extending beyond the full width and depth of the appliance by at least 3 inches (7.6 cm) in any direction or, if the appliance is to be installed in an alcove or closet, the entire floor shall be covered by the panel.

MFH-I&S-02

Figure 1

Minimum Clearances From

Combustible Materials

A 0” (0cm) Left, 2” (5.08cm) Right

B 0” (0cm) C 4” (10.16cm) D 78” (1.98m) min VENT ----

(113.6 Liters only)

VENTING

WARNING

The vent system must be installed properly. Failure to properly install the vent system could result in property damage, personal injury, or death.

Make certain the flue baffle is in place and centered in flue tube. Place the

draft diverter over the flue opening at the top of the water heater by inserting the tips of the draft diverter legs into the four (4) holes provided in the water heater top. Cut a 7 1/4 inch (18.5cm) diameter hole in the ceiling and roof

directly above the flue of the water heater. Center the water heater beneath the 7 1/4 inch (18.5cm) diameter holes in the roof and ceiling for proper alignment of the draft diverter and roof jack vent. Apply non-hardening mastic on the roof, around the previously cut hole, to form a weather seal with the flashing of the gas vent roof jack assembly. Insert gas vent roof jack assembly from above and fasten the flashing to the roof through the pre-punched holes in the flashing. Note: Only the roof jacks listed in Figure 4 can be used on this water heater. Apply additional non-hardening mastic to complete the weather seal. Slip the 3inch (7.62cm) vent connector extension that is shipped telescoped, into the gas vent roof jack assembly down onto the draft diverter that is secured to the top of the water heater and fasten with the two (2) sheet metal screws provided.

COMBUSTION AIR SUPPLY

WARNING

WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch; do not use any telephone in your building.

• Immediately call your gas supplier from a neighbor’s telephone. Follow the gas supplier’s instructions.

• If you cannot reach your gas supplier, call the fire department.

DO NOT OPERATE APPLIANCE UNTIL LEAKAGE IS CORRECTED!

IMPORTANT

The flow of combustion and ventilating air must not be obstructed.

All combustion air must be supplied from outdoors by one of the following installation methods and as illustrated in (Figure 4). The flow of combustion and ventilating air must not be obstructed. Adequate air must be supplied for combustion and ventilation. An insufficient supply of air will cause recirculation

of combustion products resulting in air contamination that may be hazardous to life. Such a condition often will result in a yellow, luminous burner flame, causing carboning or sooting of the combustion chamber, burners and flue tubes with possible damage to the heater.

Air Intake Installation - An optional 3" (7.6cm) diameter telescoping air intake and leg enclosure are required to supply fresh air to the water heater for combustion for 30 gallon (113.5L) water heaters and for 40 gallon (151.4L) water heaters. Note: When a mobile home is tightly skirted, an air

inlet opening in the skirting must be provided. The opening shall have a minimum free area of at least 9 in2 (22.9cm2). If the opening is screened or covered with a louver, the total free area must be at least 9 in2 (22.9cm2). The following steps must be followed for proper

installation of these air supply components: (Refer to Figure 4.)

1. After selecting the proper location for the water heater, cut a 4" 10.2cm) diameter hole through the floor and all other layers of flooring and sheathing directly beneath the center of the water heater.

2. Insert the air intake into the 4" (10.2cm) diameter hole and fasten to the floor with the screws provided.

3. Adjust the air intake so the lower tube is extends below the underside sheathing and secure with the screws provided. THE BOTTOM OF THE

AIR INTAKE MUST BE AT LEAST 12" (30.5cm) ABOVE THE GROUND LEVEL.

4. Seal the openings around the air intake and underside sheathing to resist the entrance of rodents.

5. Position the water heater so it is centered above the air intake. (Note:

The water heater should also be centered with the openings in the roof and ceiling to allow for correct assembly of the roof jack to the draft diverter.)

The water heater is to be secured in place using the supplied sheet metal strapping and screws. Fasten the base of the water heater to the floor using the screws provided. The perforated metal strapping must be fastened to the top of the water heater and to the adjacent walls with the screws provided

(See Figure 4).

WATER CONNECTIONS

NOTE:

BEFORE PROCEEDING WITH THE INSTALLATION, CLOSE THE MAIN WATER SUPPLY VALVE.

After shutting off the main water supply, open a faucet to relieve the water line pressure to prevent any water from leaking out of the pipes while making the water connections to the water heater. After the pressure has been relieved, close the faucet. The COLD water inlet and HOT water outlet are identified on the top of the water heater. The fittings at the cold water inlet and hot water outlet are dielectric waterway fittings with 3/4" NPT male thread. Make the proper plumbing connections between the water heater and the plumbing system to the house. Install a shut-off valve in the cold water supply line.

CAUTION

If sweat fittings are to be use, DO NOT apply heat to the nipples on top of the water heater. Sweat the tubing to the adapter before fitting the adapter to the water connections. It is imperative that heat is not applied to the nipples containing a plastic liner.

WARNING

FAILURE TO INSTALL AND MAINTAIN A NEW, LISTED ¾” X ¾” TEMPERATUARE AND PRESSURE RELIEF VALVE WILL RELEASE THE MANUFACTURER FROM ANY CLAIM WHICH MIGHT RESULT FROM EXCESSIVE TEMPERATURE AND PRESSURES.

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