Dometic NDA1402 - Burner; Flue Baffle; Flue Cap; Flue Tube

2322
23
7.3 Burner
7.4 Flue Bafe
7.5 Flue Cap
The ue bafe (spiral bafe) is a twisted piece of metal
that hangs in the ue tube to slow the heat from the ame
to the proper location on the cooling unit. If the ue bafe
is too high or low the heat will not be transferred to the
cooling unit properly. It should be cleaned periodically, at
least once a year. To clean, remove from the ue tube and
check for any damage, then clean thoroughly.
Model Above the
Burner
Size
NDA 1402 1-1/4” 6” x 15/16”
NDE 1402 Not Applicable Not Applicable
Lack of heat transfer to the cooling unit will cause low cool-
ing performance in the gas mode. It should be cleaned
periodically, at least once a year. The proper position of
the bafe above the burner should be as shown in the
chart: Always refer to parts list on the model/product
number unit you are currently working on.
The ue cap is located at the top of the ue tube and is
attached with a screw or pushed down over tube. Not all
units will come with a ue cap. The design of the bafe
wire in the ue tube will slow down a down draft.
7.6 Flue Tube
SECTION 8
Bafe
The burner is a slotted metal tube located below the ue
tube on the cooling unit. It should be level and the slots
in the burner should be directly below the ue tube. The
burner should be cleaned periodically, at least once a
year. To clean the burner, remove from the refrigerator
and check for any foreign residue that could cause a de-
ection of the gas ow or the ame. Next, soak the burner
in an alcohol based solution and allow it to air dry. If the
burner does not have a good ground it can cause erratic
gas operation. The electrode sparks to the burner tube
and an erratic ground will cause erratic gas operation.
The ue tube is a component that is welded to the pump
tube of the cooling unit. It must be cleaned periodically, at
least once a year. To clean, remove the ue cap (if appli-
cable) and ue bafe, then cover the burner and clean by
using a ue brush, Dometic Part Number 0151404001. If
the ue tube becomes coated with scale or residue from
combustion of LP gas, the efciency of gas operation de-
creases.
COOLING UNIT
8.1 Cooling Unit
The cooling unit is a self-contained, hermetically sealed
set of coils where the refrigeration process takes place.
The chemicals involved in the cooling process include
hydrogen, ammonia, water and a rust inhibiting agent.
There are no repairs recommended on the cooling unit.
If it is defective, replace with a new cooling unit. To check
the cooling unit, rst verify the AC heating elements are
good. Verify for proper Ohms at room temperature. Also
verify for proper venting and the unit is level. Then place
approximately one gallon of water inside the refrigerator
and place a thermometer in the container of water. Next,
unplug both thermistors from the lower control board. This
will by-pass the thermostat control and operate for at least
12 hours. Then check the temperature on the thermome-
ter. It should be at 43 degrees or lower depending on test
conditions. If so, the cooling unit is good. If the tempera-
ture of the water is above 43 degrees, replace the cool-
ing unit. The outside temperature will affect the cooling
capacity of the unit. There is that rare occasion when the
cooling unit will work OK for the rst 12 hours and start to
warm up. If the customer’s complaint is “works OK for 2 to
5 days and then warms up”, the unit may have an internal
problem. To test this it would be necessary to operate the
cooling unit for up to 24 to 48 hours in the test mode.