4
WARNING
POSSIBLE INJURY OR DEATH
Should the gas supply fail to shut off or if overheating occurs, shut off
the gas valve to the furnace before shutting off the electrical supply.”
SERVICING
WARNING
POSSIBLE INJURY OR DEATH
Your furnace should be inspected by a qualified service agency yearly
before turning the furnace on. Particular attention should be given to
the following items.
WARNING
CARBON MONOXIDE POISONING
Doors must be properly sealed and vent cap assembly must
be installed correctly and sealed were needed.
Combustion air must NOT be drawn from within any living
area.
DO NOT vent exhaust into living area or outside into an
enclosed porch area.
DO NOT vent any other appliance with venting systems
serving the furnace.
DO NOT allow snow or any objects to block exhaust system
or combustion air to the furnace.
1.
Inspect furnace installation and vent termination to be sure
furnace is properly secured in place, that vent terminates to the
atmosphere, and that vent tubes overlap properly and vent is tight
against outer door. (See installation manual supplied with
furnace). All exhaust system tubes must overlap no less than 1-
1/4”. All air intake tubes must overlap no less than 1/2” and be
positioned for proper function.
2.
Inspect chamber and venting to assure that these components
are physically sound, without holes or excessive corrosion and
that the installation and/or reinstallation are in accordance with
Atwood Mobile
Products Installation Instructions. (Reference
Installation Manual supplied with furnace.)
3.
Check the base on which furnace is mounted. Be sure it is
physically sound, void of any sagging, deterioration, etc.
4.
Inspect furnace, the venting, ducting and the gas piping to furnace
for obvious signs of deterioration. Correct any defects at once.
Always verify proper operation of furnace after servicing.
5.
Do not allow flue gas exhaust to have extended contact with
exterior sidewall of recreation vehicle. It will cause the material to
degrade over time.
6.
You, as the owner/user, should inspect the furnace monthly
during the heating season for presence of soot on vent. Operating
the furnace under this condition could lead to serious property
damage, personal injury or loss of life. If soot is observed on the
vent, immediately shut furnace down and contact a qualified
service agency.
WARNING
FIRE OR EXPLOSION
Use the correct gas specified for your furnace.
Only a qualified Service Technician may convert an AFLAC
series furnace from LP to NAT or NAT to LP
GAS CONVERSION
All models, except the AFLAC series, are designed for LP GAS ONLY
and cannot be converted to natural gas. To verify the setting of your
furnace, open furnace door and check the model number on the labels,
(see table below). Use only the type of gas your furnace has been set
for.
Model
Gas Type
All - AFSA
LP ONLY
All
– AFS
LP ONLY
All
– AFM
LP ONLY
All
– AFLD
LP ONLY
All
– AFLA
LP or NATURAL
AC model units come equipped with a convertible gas control.
Each unit is supplied with two main burner orifices. One will be
installed the other will be attached to the valve.
Each orifice will be clearly marked with a drill size as shown
below.
The pressure settings of the convertible valve are set based on
the orifice being used pressure can be check based on the rating
plate information or table below. Valves are not adjustable.
Use Loctite #RC609 or some other thread lock sealant on orifice
threads when installing a new orifice.
A 1/8” NPT plug is provided in the valve to make a connection to
check gas pressure.
GAS TYPE
BTU/HR
LINE
PRESSURE
REG.
PLUG
SETTING
DRILL
SIZE
Propane
(LP)
35,000
11” W.C.
10.2
” W.C.
#51
Propane
(LP)
40,000
11” W.C.
10.0” W.C.
#49
Natural
(NAT)
35,000
7” W.C.
4.
0” W.C.
3.0mm
Natural
(NAT)
40,000
7” W.C.
3.5” W.C.
#30
W.C.= water column
VALVE CONVERSION
ANNUAL PREVENTATIVE MAINTENANCE INSPECTION
A qualified RV service technician should perform the following
preventative maintenance and safety checks ANNUALLY.
Failure to properly maintain the furnace may void the furnace warranty
and can result in unsafe furnace operation.
Preventative maintenance not covered under warranty.
AIR WHEEL:
Clean and clear any obstructions. Operating
furnace with any obstructing in the blower will damage wheel
making replacement necessary and cause over heating cycling.
1.
See drawing to check which plug to use marking is on side of
adjustment reg. plugs. Furnace come with LP plug installed and
the natural plug in the bag with the natural gas orifice. NAT or LP
is stamped on the side. The type of gas being used must match
the plug and orifice in use when installed.
2.
Unscrew plug and remove from valve reg. tower. DO NOT
remove rod from inside the reg. tower or make any adjustments.
3.
A. When set for LP and NAT is required:
Unscrew plug and replace the correct plug into tower for
NAT.
NAT should now be visible.
Finger tighten plug or with small wrench. DON’T over
tighten.
