Atwood 4-E Manuel d'instructions d'installation - Page 5

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ELECTRONIC IGNITION MAINTENANCE

• The water heater comes factory-equipped with a fused circuit board,

which will protect the circuit board from wiring shorts. If the fuse

should activate, the water heater will not operate. Before replacing

the fuse, check for a short external to the board. Once the short is

corrected, replace the 2 amp fuse with a mini ATO style fuse. Do not

install a fuse larger than 3 amps.

• If the fuse is good and the unit is inoperative, check for excessively

high voltage to the unit (more than 14 volts).

• If the previous two steps did not solve the problem, check the ther-

mal cut-off (

3-I). The thermal cutoff is a device installed in the

FIG

power supply line. This device will shut off electrical power and stop

heater operation when activated. For example, if an obstruction

within the flue tube should occur, as described in the Preventative

Maintenance section, the burner flame/heat may contact the cutoff,

resulting in a melting of the fuse element incorporated in the ther-

mal cutoff. In order to restore power and proper operation of the

water heater, the obstruction must be removed and the thermal cut-

off must be replaced.

PREVENTATIVE MAINTENANCE

Spiders, mud wasps, and other insects can build nests in the burner

tube. This will cause poor combustion, delayed ignition or ignition out-

side combustion tube. Listen for a change in burner sounds or in flame

appearance from a hard blue flame to a soft lazy flame or one that is

very yellow. These are indications of an obstruction in burner tube (

4-C). Inspect and clean on a regular basis.

a. Remove air shutter screw (

down burner tube.

b. Run a flexible wire brush down burner tube (

ble at end of burner tube.

c. Vacuum burner where it enters combustion tube.

d. Return air shutter to original position and replace screw.

HOW TO CLEAN PILOT MODELS -

1. Check main burner orifice and pilot assembly for contamination

(dirt, spider webs, etc.).

2. Clean main burner tube with small brush.

3. Main burner adjustment - open air shutter 1/4 way.

4. Low pilot flame. Check for contamination - if clean have the pilot

orifice replaced.

HOW TO CLEAN ELECTRONIC IGNITION MODEL

1. Check main burner orifice.

2. Clean and adjust main burner.

3. Main burner and valve manifold must align with each other

4. Check electrode for cracked porcelain (

5. Check electrode for proper gap - 1/8" between electrode and

ground.

6. If module board functions intermittently, remove board and clean

terminal block with pencil eraser (

WATER HEATER TANK CARE

SCALDING INJURY

Turn off water heater and allow time for water to cool before remov-

•

ing drain plug to flush tank.

WINTERIZING (FLUSHING) INSTRUCTIONS

1. Turn off main water supply at pump or water hook up source.

2. Drain water heater inner tank. Due to the location of the drain plug,

approximately two quarts of water will remain in the bottom of the

tank. This water contains most of the harmful corrosive particles.

While draining the unit, if water flows sporadically or trickles instead

of flowing steadily, we recommend one of two things. First open the

relief valve to allow air into the tank and secondly, take a small

gauge wire or coat hanger and poke through drain opening to elimi-

nate any obstructions.

3. After thoroughly draining tank, flush with air pressure or fresh water.

, it may be applied either through the inlet or

IF YOU USE AIR PRESSURE

outlet on rear of tank. It may also be applied through the pressure

temperature relief valve, but first remove pressure temperature relief

valve support flange. With drain valve open, air pressure will force

4-A) and slide air shutter (

FIG

4-D) until it is visi-

FIG

FIG 6

4-E).

FIG

CAUTION

the remaining water along with corrosive particles out of unit.

IF YOU USE FRESH WATER

tance of on-board pump or external water through the inlet or outlet

found on rear of tank. It may also be applied through pressure tem-

perature relief valve support located on front of unit. Continue this

flushing process for approximately five minutes to allow ample time

for fresh water to agitate stagnant water on bottom of tank and

force deposits through drain opening.

4. Close off drain valve as well as pressure temperature relief valve.

5. After this procedure, there will be approximately two quarts of water

left at the bottom of inner tank. Should this water freeze it will not

cause any damage to the tank.

• Two or three times a year flush out tank. This may prolong the life of

your tank and allow use of a full 6 gallons of hot water.

PRESSURE-TEMPERATURE RELIEF VALVE

Do not plug pressure-temperature relief valve.

•

Weeping or dripping of a pressure-temperature relief valve while the

water heater is running DOES NOT mean it is defective.

This is normal expansion of water as it is heated in the closed water

FIG

system of a recreation vehicle.

The Atwood water heater is designed with an internal air gap at the

4-B)

top of the tank to reduce the possibility of weeping and dripping. In

time, the expanding water will absorb this air.

Turn off water heater before opening pressure-temperature relief

•

valve to establish air space. Storage water must be cool.

TO REPLACE THE AIR GAP FOLLOW THESE STEPS:

1: Turn off water heater.

STEP

2: Turn off incoming water supply.

STEP

3 Open a hot water faucet in coach.

STEP

4: Pull handle of pressure-temperature relief valve (

STEP

straight out and allow water to flow until it stops.

5: Allow pressure-temperature relief valve to snap shut; close hot

STEP

water faucet; turn on water supply.

• At least once a year manually operate pressure-temperature relief

valve (

3-G ).

FIG

When pressure-temperature relief valve discharges again, repeat above

3-H).

FIG

procedure. For a permanent solution, we recommend one of the following:

• Install a pressure relief valve in cold water inlet line to water heater

and attach a drain line from valve to outside of coach. Set to relieve

at 100-125 PSI.

• Install a diaphragm-type expansion tank in cold water inlet line. Tank

should be sized to allow for expansion of approximately 15 oz. of

water and pre-charged to a pressure equal to water supply pressure.

These devices can be obtained from a plumbing contractor or service

center.

FLUSHING TO REMOVE UNPLEASANT ODOR

Hydrogen sulfide results when the protective cladding on the interior of

the tank prevents corrosion. The electro galvanic action of the cladding

material releases hydrogen from the water. if sulfur is present in the

water the two will combine and produce hydrogen sulfide. This com-

pound produces the "rotten egg odor". Hydrogen sulfide can also be

present in your fresh water supply and as little as 1mg/liter can cause a

perceptible odor. If your fresh water has the rotten egg odor you will

need to find another source of fresh water before flushing and refilling

the water storage system.

Use four parts vinegar and two parts water to flush tank.

The Atwood water heater is designed for RV's.

Flushing the water heater several times a year will prolong the life of the

storage tank.

, it may be pumped into the tank with the assis-

WARNING

EXPLOSION

CAUTION

SCALDING INJURY

3-G )

FIG