Double Sidewall Venting - Norcold NX61 Service Manual

Ventilation - cont'd

Double Sidewall Venting

NOTE
The guidelines for intake vents and roof exhaust vents
presented in this section do not replace detail instructions. For
latest information on approved vents, installation instructions,
and special construction exceptions refer to:
• Installation Manual for NX61, NX81
• Installation Manual for NX64 / NX84, NXA64 / NXA84
• Ventilation Guidelines For Gas/Electric Refrigerators
With increased installation of refrigerators in RV slide outs,
NORCOLD has conducted extensive testing to develop
venting guidelines for double sidewall vent applications. This
work was done to ensure NORCOLD refrigerators meet the
ANSI Z21.19 standards for cooling performance when used in
slide out applications.
The challenge with slide out installations is that the "chimney
effect" that is present with roof vent installations is not as
strong in slide outs. To improve the "chimney effect" side
vent installations must have fans and baffl es. These fans and
baffl es direct the air fl ow through the surfaces of heat rejecting
components. NORCOLD has determined that the following
three key design considerations optimize heat removal in slide
out applications.
• Refrigerators installed in slide outs must have a fan or
fans to assist air fl ow. Fan kits and refrigerators with
factory installed fan(s) are available from NORCOLD.
• Fresh air must be directed to fl ow through the surface
areas of the absorber coils, condenser fi ns, and the
outer surface of the canister.
• Corners and structural pockets where heated air
may stagnate must be reduced in size or completely
eliminated.
Refrigerator Service Manual
An additional challenge with double sidewall venting is the
depth of the enclosure. The deeper the enclosure, the greater
the impact on the air fl ow through the rear of the refrigerator.
Taking the three key design considerations and the variable
depth requirement into account, NORCOLD developed and
tested several baffl e arrangements for the NX6X / NX8X,
NXA6X / NXA8X models versus their ability to meet the ANSI
standards.
As the result of this testing, NORCOLD was able to reduce
the baffl e confi guration down to two baffl es for the NX6X and
NX8X models. It should be noted that baffl e arrangements
are different if the enclosure depth is greater than 24 inches
or less than 26 inches. The baffl e confi gurations are shown in
Figs. 17 and 18.
Air Intake Vent
The ventilation and combustion air fl ow into the enclosure
through the air intake vent. See Figs. 17 and 18.
Sidewall Exhaust Vent
The heat absorbed by ventilation air and combustion gases
fl ow out of the enclosure through the sidewall exhaust vent.
See Figs. 17 and 18 for details.
www.norcold.com/cda NX6 / NX8 / NXA Models
35