Marathon MR50245 Instruction Manual download pdf (Page 4)

11.. IINNSSPPEECCTT SSHHIIPPMMEENNTT ——

Inspect water heater for possible damage.

Check the markings on the rating plate of the water heater to be certain the

power supply corresponds to that for which the water heater is equipped.

22.. TTHHEERRMMAALL EEXXPPAANNSSIIOONN —— DDeetteerrmmiinnee iiff aa cchheecckk vvaallvvee eexxiissttss iinn tthhee iinnlleett

wwaatteerr lliinnee..

It may have been installed in the cold water line as a separate

back flow preventer, or it may be part of a pressure reducing valve, water

meter or water softener. A check valve located in the cold water inlet line

can cause what is referred to as a

””cclloosseedd wwaatteerr ssyysstteemm””

. A cold water

inlet line with no check valve or back flow prevention device is referred to

as an ”open” water system.

As water is heated, it expands in volume and creates an increase in the

pressure within the water system. This action is referred to as

””tthheerrmmaall

eexxppaannssiioonn””

. In an ”open” water system, expanding water which exceeds

the capacity of the water heater flows back into the city main where the

pressure is easily dissipated.

””cclloosseedd wwaatteerr ssyysstteemm””

, however, prevents the expanding water from

flowing back into the main supply line, and the result of

””tthheerrmmaall eexxppaann--

ssiioonn””

can create a rapid, and dangerous pressure increase in the water

heater and system piping. This rapid pressure increase can quickly reach

the safety setting of the relief valve, causing it to operate during each

heating cycle. Thermal expansion, and the resulting rapid, and repeated

expansion and contraction of components in the water heater and piping

system can cause premature failure of the relief valve, and possibly the

heater itself. Replacing the relief valve

wwiillll nnoott

correct the problem!

The suggested method of controlling thermal expansion is to install an

expansion tank in the cold water line between the water heater and the

check valve. The expansion tank is designed with an air cushion built in

that compresses as the system pressure increases, thereby relieving the

over pressure condition and eliminating the repeated operation of the

relief valve. Other methods of controlling thermal expansion are also

available. Contact your installing contractor, water supplier, or plumbing

inspector for additional information regarding this subject.

Thank you for buying your non-metallic electric water heater. Your new water

heater is made of the latest materials and will not rust or corrode. It will give

many years of hot water service when installed, operated and maintained

according to the instructions in this manual.

Your water heater is completely assembled and ready to install. This manual

provides the general instructions for installation. Because of several variables,

such as the installation location, existing piping, and local codes, it is impossi-

ble to provide exact instructions for everyone’s specific needs. For this reason,

it is suggested that the entire manual be read prior to beginning any installation

work, then carefully plan the installation. This can help to avoid costly mistakes

including damage to the water heater, not covered under terms of the warranty.

Almost all new products (automobiles, boats, clothing, plastic and wood items,

etc.) have an odor or smell to them for a time. This water heater may also have

a ”new” smell or odor to it due to the non-metallic materials used in the manu-

facturing process. This ”new” smell is not harmful, and will disappear in a short

time.

The vacuum valve, which must be used when installing the water heater, is

factory installed.

The location chosen for the water heater must take into consideration the fol-

lowing:

LLOOCCAALL IINNSSTTAALLLLAATTIIOONN RREEGGUULLAATTIIOONNSS

This water heater must be installed in accordance with these instructions,

local codes, utility company requirements or, in the absence of local codes,

the latest edition of the National Electrical Code. It is available from some local

libraries or can be purchased from the National Fire Prevention Association,

Batterymarch Park, Quincy, MA 02269 as booklet ANSI/NFPA 70.

LLOOCCAATTIIOONN

Locate the water heater in a clean dry area as near as practical to the area of

greatest heated water demand. Long uninsulated hot water lines can waste

energy and water. Place the water heater in such a manner that the thermostat

and element access panels can be removed to permit inspection and servicing

such as removal of elements or checking controls. The water heater and water

lines should be protected from freezing temperatures. Do not install the water

heater in outdoor, unprotected areas, or near any other appliances where high

temperature are present, such as wood burning stoves, boilers or furnaces.

High temperatures can warp or otherwise damage the non-metallic construc-

tion of this water heater.

The water heater should not be located in an area where leakage of

the tank or connections will result in damage to the area adjacent

to it or to lower floors of the structure. Where such areas cannot be

avoided, it is recommended that a suitable drain pan, adequately

drained, be installed under the water heater.

NOTE: Auxiliary drain pan installation MUST conform to local

codes.

Drain Pan Kits are available at your local retail outlet or service center.

RREESSTTAAUURRAANNTT IINNSSTTAALLLLAATTIIOONN::

If the water heater is to be installed in a restaurant, or other

location where NSF International listing is required, it must be

weather sealed to the floor, a raised base, or shelf so that seepage

cannot accumulate under it; or elevated to provide at least (6)

inches of clearance from the floor.

In order to meet NSF International requirements for Standard 5,

the base of the water heater must be sealed to the floor to prevent

seepage underneath. Apply a 3/8” bead of RTV Silicone

completely around the floor edge of the base of the tank.

Introduction

Installation

CAUTION

Figure 1. — Auxiliary Drain Pan

A — Diameter of water heater plus 2" min.

B — Maximum 2"

To open drain, line should

be at least

/4" ID and

pitched for proper drainage.

1 2 3 4 5 6 7 8 9 ... 15 16

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Marathon MR50245 Instruction Manual Page 4

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