Thetford Norcold 453 - Manual (Page 5)

VENTILATION REQUIREMENTS
WARNING: Carbon Monoxide can cause
nausea, fainting, or death. Inadequate ven-
tilation or partial blockage of the refrigera-
tor’s flue can result in increased carbon
monoxide emissions when operating in the
gas mode. To prevent the emission of lev-
els of carbon monoxide, installation must
assure complete isolation of the living
space of the R.V. from the refrigerator’s
combustion system. Follow Norcold’s Ven-
tilation and Installation recommendations
explicity.
Venting is required in an R.V. refrigerator installa-
tion to remove the products of combustion, to isolate
the living space of the vehicle from the combustion
system of the refrigerator, to remove the excess heat
from the generator area of the refrigerator’s cooling
system, and to remove the heat that is extracted
from the refrigerator cabinet.
Certified installation requires that one intake (lower)
and one exhaust (upper) be used. For the models
6052, 6053, 652, and 653, the installer has the op-
tion of exhausting through the roof or through an up-
per side wall vent. Whether roof or side wall exhaust
venting, the specified vent kit must be installed as
directed by this manual. To insure adequate refrig-
erator performance, a continuous air flow is required
across the refrigerator’s cooling system.
The air passage from the intake vent to the refrigera-
tor coils and from the refrigerator coils through the
exhaust vent must be unobstructed.
TABLE 1
DIMENSIONS (INCHES) for Vent Kits 2, 3, and 4
The vents for these refrigerators are certified by
A.G.A. and CGA and must be installed as directed
by this manual without modification. Any deviation
or substitution:
* Can result in carbon monoxide levels in the living
space of the vehicle.
* Will void the agencies’ certification.
* Will void the refrigerator warranty.
* Will effect refrigerator performance.
The intake vent (lower) also serves as a access
(service entrance) door. The bottom of the intake
vent opening must be flush with the surface on which
the refrigerator is mounted. This configuration allows
any leaking propane to ventilate to the outside.
A.G.A. And CGA certification permits installing the
refrigerator with zero (0) inches minimum clearance
between the refrigerator and any adjacent walls. This
certification does not specify any maximum clear-
ance. However, to insure adequate air flow across
the cooling system, the clearance must be mini-
mized. The combination of the two vents and the
minimum clearances provide the necessary air flow
through the creation of a natural draft, or "chimney
effect" across the cooling system.
Certified Vent Kits
Kit Number
Certified Lower
Vent Door
Certified
Roof Jack
Models
2 & 3
615998
616009
616010
617778
615791 All Models
Kit Number
Certified Lower
Vent Door
Certified
Upper Side
Exhaust
Models
4
615998
616009
616010
617778
617485
442. 443
452, 453
ONLY
Cut - Out Dimension (inches)
Roof Jack Lower Intake Vent Approved
Models
Part No. Type Length Width Height Width Radius
617778 Plastic - - - - 13 3/4 21 1/2 - - All Models
616010 Sq. Corner - - - - 13 3/4 21 3/4 - - All Models
616009 Rad. corner - - - - 13 3/4 21 7/8 3 1/4 All Models
615998 Rad. Corner - - - - 13 3/4 21 7/8 3 1/4 All Models
85 Upper Side
vent
-- -- 7 1/4 18 -- 6052, 6053
652, 653
615791 Roof Jack 24 5 1/4 - - - - - - All Models
5