Atwood AFL Series Technical Installation Manual - Page 6
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DO NOT install floor registers within 2 feet of return air openings.
See ducting option from casing top and bottom areas. Hard
ducting must be sealed to the furnace and floor to insure proper
operation of the appliance.
Units can be installed as bottom discharge systems in either
horizontal or vertical position.
HORIZONTAL FLOOR DISCHARGE CUTOUT
1.
Remove bottom discharge plate, this ducting option must be
connected to a floor ducting system.
2.
The drawing shows the use of a gasket (F) and plenum plate (E)
for attaching furnace to the flooring. See parts list for order
number.
3.
Other methods of sealing furnace to the floor are acceptable as
long as clearances and seals meet requirements of clearances
and temperature.
4.
Fasten plenum plate bend tabs over floor cutout. (If a gasket and
plenum plate is not used seal furnace to hard ducting system with
approved tape making sure seal is airtight) Continue with step 5.
5.
Position gasket on plenum over opening.
6.
Set furnace on gasket; make sure gasket remains in position.
7.
Additional flex ducting can also be used to maintain correct static
pressure.
FIRE OR EXPLOSION
Never check for leaks with an open flame. Turn on the gas and apply
soapy water to all joints to see if bubbles are formed.
GAS CONNECTION
Gas Pressure Test
The furnace and any individual shut-off valve must be
disconnected from gas supply piping system during and pressure
testing of system at test pressures of more than 1//2" PSI.
WARNING
Before furnace is, connected piping systems are to be tested to
be leak free. The test must maintain air pressure of a least 6" of
mercury or 3 PSI for at least 10 minutes.
The entire piping system is to be adjusted to maintained a
pressure of 10" to 13" W.C. when all appliances are in operation.
Test gas connections for leakage with soapy water or a leak test
solution.
If local codes allow the use of a flexible gas appliance connector,
always use a new listed connector. Do not use a connector, which
has previously serviced another gas appliance.
1.
Connect gas line to the fitting located on the valve through hole in
top of casing or if supplied with an extended manifold at the rear
of the furnace.
2.
Be sure all male pipe threads, other than flare fittings, are treated
with a sealing compound resistant to the action of propane (LP)
gas. DO NOT put sealing compound on flare fittings
3.
Remove grommet plug from furnace. After inserting gas line
through gas plug and connecting to valve re-install gas plug this is
a required air seal.
4.
Insert gas line through grommet plug (DO NOT CUT).
5.
Connect gas line inside furnace casing immediately ahead of gas
control valve or at the rear when extended manifold is supplied.
6.
Use two wrenches to hold brass fitting and flare nut when
tightening gas line to brass fitting. DO NOT twist valve assembly.
DO NOT twist valve assembly, torque fitting to 20-22 ft. lbs.
CONVERTIBLE GAS CONTROL
AC model units come equipped with a convertible gas control.
Each unit is supplied with two main burner orifices. One will be in
place; the other will be attached to the blower housing cover.
Each orifice will be clearly marked with a drill size as shown
below.
The pressure settings of the convertible valve are set for natural
gas NAT 3.5" WC or LP 10.5" WC and 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 upstream of gas connections for
checking gas pressure.
GAS
BTU/HR
TYPE
Propane
40,000
(LP)
Natural
40,000
(Nat)
Propane
35,000
(LP)
Natural
35,000
(Nat)
*WC= Water Column
6
LINE
REG. PLUG
PRESSURE
SETTING
11" WC
10.5" WC
7" WC
3.5" WC
11" WC
10.5 WC
7" WC
3.5" WC
DRILL
SIZE
49P
#30
#51
#30