Marathon MR50245 Instruction Manual download pdf (Page 13)

Properly maintained, your new, non-metallic water heater will provide years of

dependable trouble-free service. It is suggested that a routine preventive main-

tenance program be established and followed by the user. It is further recom-

mended that a periodic inspection of the operating controls, heating element

and wiring should be made by service personnel qualified in electric appliance

repair.

11.. RROOUUTTIINNEE PPRREEVVEENNTTAATTIIVVEE MMAAIINNTTEENNAANNCCEE

AA..

Most electrical appliances make some sound when in operation, even

when new. If the hissing or singing sound level increases excessively,

the electric heating element may require cleaning. Contact your installer

or plumbing contractor to inspect.

BB..

The area near the water heater must be kept free of flammable liquids

such as gasoline or paint thinners, adhesives or other combustible

materials.

CC..

At least once a year, lift and release the lever handle on the tempera-

ture pressure relief valve, located on top of the water heater, to make

certain the valve operates freely and allow several gallons to flush

through discharge line (see Figure 16). Make certain the discharged

water is directed to an open drain.

Before manually operating the relief valve, make certain no one

will be exposed to the danger of coming in contact with the hot

water released by this valve. The water may be hot enough to cre-

ate a SCALD hazard. The water released should be directed to a

suitable drain to prevent injury or damage.

NOTE: If the temperature and pressure relief valve on the water

heater discharges periodically, this may be due to thermal expan-

sion in a “Closed” water system. Contact the water supplier or

your plumbing contractor on how to correct this. DO NOT plug

the relief valve outlet.

DD..

A water heater’s tank can act as a settling basin for solids (sand, silt,

dirt and mineral scale) suspended in the water. It is, therefore, not

uncommon for these deposits to accumulate in the bottom of the tank.

It is suggested that a few quarts of water be drained from the water

heater’s tank ONCE EVERY MONTH to clean the tank of these

deposits. (See Figure 15)

EE..

Rapid closing of faucets or solenoid valves in automatic water using

appliances can cause a pounding “water hammer” sound. “Water

hammer” can be described as a banging noise heard in a water pipe

following an abrupt alteration of the flow with resulting pressure surges.

Strategically located risers in the water pipe system can be used to

minimize the problem. Also water hammer arresting devices are usual-

ly available from your plumber or local plumbing supply store.

22.. RREEPPLLAACCIINNGG TTHHEE TTEEMMPPEERRAATTUURREE && PPRREESSSSUURREE RREELLIIEEFF VVAALLVVEE ——

If the Temperature and Pressure Relief Valve should ever need replacing,

use only a valve specified by local codes, but not less than a new combina-

tion temperature and pressure relief valve, complying with the Standard for

Relief Valves and Automatic Gas Shutoff Devices for Hot Water Supply

Systems, ANSI Z21.22. The pressure rating of the relief valve must not

exceed 150 PSI, the maximum working pressure of the water heater as

marked on the rating plate. The BTUH Rating of the relief valve must not

be less than the input rating of the water heater as indicated on the rating

label located on front of the heater (1 watt = 3.412 BTUH).

Before starting to replace the Temperature & Pressure Relief Valve,

be sure to turn the power supply to the water heater ”OFF” at the

electrical distribution panel.

AA..

With the power supply turned ”OFF”, close the shut-off valve installed in

the cold water supply pipe.

BB..

Open a nearby hot water faucet and KEEP OPEN.

CC..

Fasten a length of garden hose to the drain valve. Place the other end

of the hose at a floor drain, or other suitable location. (See FIgure 15)

DD..

Open the drain valve for about a minute or until the water level in the

tank is below the relief valve.

The water drained from the tank may be hot enough to present a

SCALD HAZARD and should be directed to a suitable drain to pre-

vent injury or damage.

EE..

Remove the discharge pipe from the relief valve, then remove the old

relief valve (see Figure 3 on pg. 4). Use two wrenches, one to hold the

union hex nut on the heater, and one to remove the relief valve. NEVER

use just one wrench! Doing so can damage the tank beyond repair.

FF..

Be sure a seal ring is inside the center (relief valve) union hex nut. Use

factory seal washers only. DO NOT use sealants with seal ring wash-

ers! Next, turn the valve into the union fitting on the tank. Face the relief

valve outlet in a direction of the old valve. Hold the valve in place and

tighten the union hex nut.

IMPORTANT!! Do not apply heat directly to the relief valve con-

nection. If sweat connections are used, sweat tubing to adapter

before fitting adapter to relief valve on heater. Any heat applied

to the relief valve will permanently damage it and/or the tank.

GG..

Install the discharge pipe to the new relief valve. (see Figure 3 on pg. 4).

HH..

Open the cold water supply shut-off valve. When water from hot water

faucet opened earlier runs smooth, with no more air bubbles, close the

faucet.

II..

Turn the electric power on to place the water heater in service again.

Be sure the water heater is completely filled with water before turn-

ing on electric power.

DANGER

Maintenance

Figure 16 — Manually Operating the Temperature and Pressure

Relief Valve

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PPrreessssuurree RReelliieeff

VVaallvvee

SSuuppppoorrtt

SSttrraapp

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PPiippee

LLiifftt aanndd rreelleeaassee lleevveerr oonn TT&&PP VVaallvvee sseevveerraall ttiimmeess ttoo bbee ssuurree tthhaatt iitt ooppeennss aanndd ooppeerraatteess ffrreeeellyy..

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CAUTION

DANGER

CAUTION

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Marathon MR50245 Instruction Manual Page 13

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