atwood oD50, oD50cW On-Demand Water Heaters - Manuel (Page 5)

5
Some factors relating to output performance are:
1. City or Park Water Service incoming pressures.
2. Obstructions or restrictions in the water system including
water bypass valves in vehicles. The bypass valve in your
water system should be OFF during normal use.
3. Use of flow restrictors in faucets and/or shower heads.
Eliminate restrictors for best performance.
4. Propane gas system pressure should be 11”w.c. while in
operation. Be sure that LP tanks have plenty of gas and
are properly regulated. This should be verified by an
authorized Atwood service technician.
If problems persist, please contact the nearest authorized
Atwood Service Center or call Atwood Technical Support at
1-866-869-3118.
MAX
MIN
FACTORY
SETTING
modulating valve as viewed from exterior door
m
caution
scalDinG inJury
Setting temperature control dial
at a higher position increases
temperature of the water,
increasing the risk of scalding
injury. Before selecting or
changing the temperature setting,
see instruction manual
MPD 93756.
ProDucT DamaGe
BURNER TUBE – Spiders or insects
can build nests in burner tube causing
obstructions. Indications of obstructions
are: • change in burner sound • change in
flame appearance from a hard blue flame
to a soft lazy flame • very yellow flame •
sooting condition. Regularly inspect and
clean burner tube to prevent obstructions.
cauTion: Consult
Owner’s Manual
before adjusting the
Modulating Valve
summer operation:
During the summer months when the incoming water
temperatures are relatively warm (ranging from 70°F to 90°F)
it is recommended that the modulating valve adjustment be
placed in the MIN position. This reduces the gas input of the
heater to keep the water temperature from getting too hot
with high incoming water temperature
Winter operation:
During the winter months when incoming water temperatures
are cooler (ranging from 45°F to 70°F) it is recommended to
place the modulating valve adjustment in the MAX position.
In addition, the OD50 comes equipped with a cold weather
switch on the heat exchanger that will cycle the burners
on and off at low input when the temperature of the heat
exchanger reaches approximately 38°F and leaves the
burners on until the temperature of the switch reaches
approximately 55°F. This protection is only recommended for
camping in weather down to 15°F.
For operation during even colder outside temperatures (as
low as -15°F) the cold weather kit option (or model OD50CW)
is recommended. The cold weather kit consists of a 12 VDC
heat pad for the modulating valve and 2 ceramic heat blocks
for the water lines. This will keep the water in the system from
freezing when in the OFF state in extreme cold conditions.
Without the cold Weather Kit installed
With the cold Weather Kit installed
Winter Protection During storage:
Before storing the system for the winter, all water should
be drained from the system. To do this, open one tap at
a time using compressed air to purge the system of all water.
Then either of the following steps should be taken:
1) Once purged, simply open the Pressure Relief Valve and
leave in the open position.
2) Once purged, close the Pressure Relief valve and add a
non-toxic RV antifreeze if recommended by your coach
manufacturer.