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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
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.
5
, it may be pumped into the tank with the assis-
WARNING
EXPLOSION
CAUTION
SCALDING INJURY
3-G )
FIG
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