Atwood 8516 User manual

/iltAtwood'
Atwood Mobile Products LLc
1120 North Main Street . Elkhart, lN 46514
USA : 800-546-8759 Canada & USA : 800-825-4328
lnternet: http://www.atwoodmobile.com
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Literature number 30090
hydro flamerM
8500-lV Series Furnaces
Models 8516, 8520, 8525, 8531, 8535
8516-LD, 8520-LD, 9525-LD, 9531-LD,
8535-LD
1 522, 2334, 1 522-LD, 2334-LD
Technical lnstallation Manual
English, Frangais (et Canada)
This instruction manual is for use by an authorized service
technician to install an Atwood - hydro flamerM furnace. Should
you require further information, contact your dealer or nearest
Atwood Mobile Products Service Center.
This furnace design has been certified for installation in
recreation vehicles as a MSP Category lll furnace. Follow this
installation instruction to insure safe operation of the furnace.
Failure to install furnace according to this installation instruction
nullifies the furnace warranty.
Effective 10/10
A wlnu*c
Avoid possible injury or death
lmproper installation, adjustment, alteration, service or
maintenance can cause property damage, personal injury
or loss of life. Refer to the installation instructions and/or
owners manual provided with this appliance. lnstallation
and service must be performed by a qualified installer,
service agency or the gas supplier.
INDEX
SPECIF|CAT|ONS. ...........2
MODELS ..,.,,.,,.2
OIMENSIONS ,,,,.2
WEIGHT ,,,,,,.,,2
MINIMUMCLEARANCETOCOMBUSTIBLES: ... .....2
INSTALLATIONANDSAFETYCODES ,,....,2
GENERAL FURNACE LOCATION .,.,.,..,.,2
DOORSIDEWALLCUTOUT .........3
DOORINSTALLATION. .....3
LD VENT SIDE WALL CUTOUT
LD VENT INSTALLATION 4
4
VERTICAL INSTALLATION CAULKING AREAS ...,.4
DUCTING OPTIONS ...,.,,.,4
REQUIREDMINIMUMDISCHARGE,....,...,,4
FLEXIBLE DUCTING SYSTEMS ......5
HARD DUCTING FLOOR SYSTEMS ... ... ...5
HORIZONTALORVERTICALDISCHARGE ...........5
EXTENSTONBOXDISCHARGE... ..........5
FLEXADAPTER PLATE .....5
PROPANE GAS CONNECTION .... ..6
ELECTRICALCONNECT|ONS... ...........6
CONDUCTORSIZINGTABLE ..,....,6
POWERSUPPLY .....6
THERMOSTATINSTALLATION..... .........6
OPERATING INSTRUCTIONS .., .,, ,,7
To Shut Down . ..... ..7
SYSTEM CHECKS ......,.,..7
PROPANEGASPRESSURETEST ...,.,,.,,,7
STATIC PBESSURETEST.. .. , ,.,...7
IGNITIONCONTROLDIAGNOSTICCODES ......,.,.7
STANDARD3TRIES FOR IGNITION CONTROLS , ,,, ,,7
2-STAGE 3TRIES FOR IGNITION CONTROLS , , . . . . . .7
WIRING DIAGRAMS .. .......9
Bs-IVWIRING& LADDER DIAGRAM .........9
85-IV-LDWIRING&LADDER DIAGRAM ......9
1522,2334LDWIRING&LADDERDIAGRAM .. .,..10
1522,2334 WIRING & LADDER DIAGRAM ...... ....10
Parts Drawing .... ..........11
TO THE INSTALLEH:
.TO THE CONSUMER:
LEAVE THIS MANUAL WITH
THE APPLIANCE.
RETAIN THIS MANUAL FOR
FUTURE REFERENCE.
SAFETY ALERT SYMBOLS
Safety Symbols alerting you to potential personal safety
hazards obey all safety messages following these symbols
A wanuxc
Avoid possible injury or
death
A caunoru
Avoid possible injury
and/or propertv damaoe
A wanumc
FIRE OR EXPLOSION
lf the information in this manual is not followed exactly, a
fire or explosion may result causing property damage,
personal injury or loss of life.
FOR YOUR SAFETY
WHAT TO DO IF YOU SMELL GAS:
. Extinguish any open flame.
r Evacuate all persons from the vehicle.
. Shut off the gas supply at the gas container or
source.
. Do not touch any electrical switch, or use any
phone or radio in the vehicle.
. Do not start the vehicle's engine or electric
generator.
o Contact the nearest gas supplier or qualified
service technician for repairs.
. lf you cannot reach a gas supplier or qualified
service technician, contact the nearest fire
department.
. Do not turn on the gas supply until the gas
leak(s) has been repaired.
lnstallation and service must be performed by a
qualified Service Technician, Service Center or gas
supplier. Parts List

Models 8516-lv 8520-lv 8525-lv 8531-lV 8s35-lV
8516-LD 8520-
LD 8s25-
LD 8531-
LD 8535-
LD
BTU lnout 16,000 20.000 25,000 30,000 34,000
Duct Static
Pressure 20'wc .10"
WC .10"
WC .10"
WC .10"
WC
Amperage
(AMPS) 4.6 4.6 7.6 7.6 9.8
Watts 55 55 91 91 118
Power Supply
(Volt DC) 12 12 12 12 12
Recommended
Return Air 80 in2 80 in2 80 in2 80 in2 80 in2
Minimum
Return Air 65 in2 65 in2 65 in2 65 in2 65 in2
SPECIFICATIONS
MODELS
(wc
DIMENSIONS
WEIGHT Standard 2-Staqe
Furnace 30 lbs 31 lbs
Boxed 32 lbs 33 lbs
MINIMUM CLEARANCE TO COMBUSTIBLES:
ii;o;b;;rds. walls & similar combustible buildino materials must be
prwiOeO tne full length and width of unit'
Soacinq of 1/4" to ducting within 3 ieet of furnace must be provided .
J[[.i LL ri.t.d wire boLind vinyl ducts are used All ducting material
,..Jt O" rated ior continuous use at minimum of 200"F'
. Clearances are specilically for plywood or similar building materials
sriiornOing the furnace (i.e. Furnace should not be located under
furniture oiin a closet space where clothing or other material could
be located).
. Furnace "ifi.i.n.y rating is a thermal rating determined under
continuous operaiing co-nditions, independent of any installation.
Etti.i.n.v rate ls giv-en at 77% minimum; actual elficiency rating
may be higher.
. Reiurn airls supplied through openings in furnace casing. All return
"ii p".*g". ,Lit o" kept cleai for furnace to function properly'
n"t", to frini.r, clearance to floorboards, walls & similar
combustible building material' The total unobstructed return air
opening size(s) muit not be less than specified in specification -
minimum return air. Failure to meet minimum return alr
requirements nullif ies f urnace warranty.
When frrnuces are installed to minimum clearances, an additional
t 6 in' of return air must be provided to blower side of furnace' or a
2i ciearance the full length and height on blower slide must be
maintained.
INSTALLATION AND SAFETY CODES
USA and Canada - follow all applicable state and local codes - in the
absence of local codes or reguiations, refer to current standards o1:
. Recreation Vehicles ANSI A1 19.2/NFPA 501C
. National Fuel Gas Code ANSI 2223'1 andlor CAN/CGA B149
lnstallation Codes
Federal Mobile Home Construction & Safety Standard' fille 24
CFn, patt 3280, or when this Standard is not applicable' the
Siunblio ror. Manufactured Home lnstallations (Manufactured Home
SiG., C".rr.ities and Set-ups), ANSI A255'1 and/or CAN/CSA-
Z24O MH Series, Mobile Homes.
Ground National Electrical Code ANSI/NFPA No' 70 and/or CSA
c22.1
Park Trailers ANSI 119.5
UMN)
GENERAL FURNACE LOCATION
a
alnstall furnace through an exterior wall'
DO NOT install furnace near iilt-out rooms, slide-outs' doors or
other projection that could obstruct furnace exhaust'
A wannrnc
CARBON MONOXIDE POISONING
. Furnace must be installed and vented to these
lnstructions.
. lmproper installation, adjustment, alteration, service or
maintenance can cause injury or property damage'
. lmproper installation location may cause furnace to
produce negative pressure, affecting combustion air or
venting of other aPPliances.
Models # 't522 2334
Low Hiql' Low Hiqh
BTU lnput 15 000 22,000 23,000 34,000
Duct Static
Pressure .10'w.c .10" w.c. .10'w.c. .10" w.c.
Amperage
(AMPS) 4.8 10.2 6.5 13.2
Watts 58 122 ao 158
Power Supply
(Volt DC) 12 12 12 12
Recommended
Return Air 80 in2 80 in2 80 in2 B0 in2
Minimum Return
Air 65 in2 65 in2 65 in2 65 in2
A "*,r,"oL 'NSTALLATI.N *ARN'NGS
a
a
a
DO NOT install furnace on material that restricts return
air, like carpet or any soft material such as vinyl'
DO NOT install furnace where clearance to
combustibles cannot be maintained.
DO NOT modifY furnace in anY waY'
DO NOT alter furnace for a positive grounding system'
DO NOT hi pot furnace unless electronic ignition system
(circuit board) has been disconnected'
bO ruOr use battery charger to supply power to DC
model furnace even when testing.
DO NOT use 12O-volt AC current with DC models'
DO NOT use furnace cabinet area as a storage
compartment
DO NOT vent furnace with venting system servlng
another appliance.
DO NOT vent furnace to an outside enclosed porch
area.
DO NOT use for temporary heating of buildings or
structures under construction.
Protect building materials from degrading from flue gas
exhaust.
Protect furnace electrical components from water'
a
a
a
aCompartments must be closed when operating unit'
All Models widrh Height Depth
/lac 16-112" 7-318" '18',
Door 19-114" 9-114 114"
Vent LD 5-3/8"
Horizontal ToP and Sides 1/2" Rear 1Bottom 3/16"
Vertical Top and Sides 1/2" Rear 1Bottom 0" (slide plate end)

Locate furnace near midpoint of coach for single furnace
applications.
lnstallation must provide accessibility if any repairs are necessary to
the furnace. Failure to meet this requirement will create additional
labor costs that will be the responsibility of the installer.
DO NOT install vent in areas where projection or door openings
come within 6" of vent tube opening.
DO NOT install furnace in an area where wires, pipes or other
ob.jects will interfere with installation or operation of furnace.
DO NOT install furnace on material that restricts return air, such as
directly on carpet, or soft material (like vinyl). lf you must install
furnace on carpet or soft material, install furnace on cleats, or on a
wood or metal panel extending the full width and depth of furnace
plus minimum clearance to combustibles.
DO NOT use peiroleum or cilrus type cleaner on plastic parts, as
damage may occur.
A *o*wrttc
CARBON MONOXIDE POISONING
Properly seal door/vent assembly to prevent carbon
monoxide from entering coach.
o DO NOT draw combustion air from living area.
. DO NOT vent exhaust air into the living area or an
enclosed porch.
DOOR SIDEWALL CUTOUT
* Recommended exterior wall thickness 0" 1o 1-112" - 2-112'maximum.
ABC
Figure 1
DO NOT oversize hole - over sizing can result in water leakage.
A *o*,u'rc
CARBON MONOXIDE POSISONING
Properly seal door to prevent carbon monoxide from entering
coach.
A wlnu*c
CARBON MONOXIDE POSIONING
Properly adjust draft cap to prevent carbon monoxide from
entering coach.
DOOR INSTALLATION
. Standard Door or Deluxe Door may be used alone or with optional
Recessed Bezel. See instructions supplied with bezel for cutout
hole and mounting instructions.
. The furnace must always be installed level (front to back, side to
side) to prevent water intrusion lnto the interlor.
. To prevent moisture f rom entering inside of coach, apply RTV type
sealant.
. The door bezel must fit tightly, to prevent water leakage.
o Doors are designed to allow water drainage in either horizontal or
vertical installations. Proper location of Vent Assembly is important
for proper exhausting of fumes and proper function of furnace.
. With wing nut (C) loosen on draft cap assembly, close door (A) and
pull draft cap assembly (D) fonntard until it pushes against the
screen (B).
. Open door and tighten wing nut. Close door and check to insure
draft cap is against door screen.
RIGHT SIDE LEFT SIDE
Figure 2
Pull furnace forward until mounting tabs protrude through exterior
wall.
The edge of control box must be flush with coach's outer skin
(VERTICAL installation -gas connection must be on bottom).
Apply RTV type sealant to entire back flange of bezel creating a
watertight seal.
Secure by inserting door bezel onto furnace tabs through notches
on door bezel.
The gas inlet plug and slide plate must be installed in the closed
position and door bezel flange inside of slide plate. lnsert six
mounting tabs lhrough slots provided in door bezel. Bezel must be
tight against casing and cuiting into RTV sealant.
Bend tabs flush with door bezel, aligning holes in tabs with slots in
door bezel.
lnstall 12 mounting screws. DO NOT deform bezel.
The door bezel must fit tightly against sidewall to prevent water
leakage.
Fill tab slots with caulking after securing wlth screws.
Remove excess sealant from around door bezel and visually
inspect door bezel to make sure it is completely sealed.
Secure mounting legs to floor for horizontal installation. For vertical
units use vertical mounting bracket and self{apping screws to hold
furnace to floor (tabs on control box can be used to secure furnace).
For Vertical Kit Part No. see parts list.
Fasten door with fasteners provided.
t.
2.
4.
5.
b.
7.
8.
o
10.
11.
CAUTION
Personal lnjury
DO NOT allow furnace tabs to protrude through sidewall
cutout opening during installation process until door is
installed and tabs are bent over. Take care when handling
or brushing against all sheet metal edges to avoid personal
!njury.
RIGHT SIDE
12.

LD VENT SIDE WALL CUTOUT
c_r
C
a':
Figure 3
B
Side Wall Cutout 2-3t8" 1-1 12" J- llz
Diameter hole
* Recommended wall thickness 0" 1o 2-112"
OOfrf Ot oversize hole - over sizing can result in water leakage'
LD VENT INSTALLATION
VERTICAL INSTALLATION CAULKING AREAS
I
,/
Figure 4
You Must Caulk- all areas shown'
. Around entire red gas inlet plug "C"'
. Around entire black stiJe plateldges were it mates with sheet metal
D
A
B
t-
L
a
"8".
Alound entire gas line where it enters gas inlet plug "D"
ni..g *"fJ.O ioints "A' of two bottom corners of sheet metal casing
and irere door tlange covers slide plate'
DUCTING OPTIONS
REQUIRED MINIMUM DISCHARGE
Models
8516,8520
8s25, 8s31
otretr
1522
2334
All Models using toP or
bottom discharge oPtions
All vertical installations
Required Discharge Area
24 in'
36 in2
48 inz
36 in2
48 in2
48 in2
48 in2
--a-- i
AB-
A
1.
2.
J.
4.
tr
6.
Locate vent hole cutout as called out
oiirii-rlz" dlameter hole through sidewall of coach'
Remove vent and vent ring from furnace'
l;;;;iir;;;.lrom backsi-de of wall, lining up hole in wall with hole
for vent in furnace.
ippty seatant to back of vent ring and vent cap base'
inllu'ir u"nt assembly with HOT it top on horizontal installations and
iloT ".ligr,t;ide for vertical installations Vent ring must slip
i.Jil" ."rinrittn air intake tube' Secure to wall with four (4)
screws not Provided.
ili,.i*."rrlUfy must maintain minimum overlap ot 1'114" on exhaust
trne unO 1/2" minimum on combustion air tube' DO NOT exceed
maximum wall thickness.
$;;;;i;;;" to floor with two (2) screws' through legs on back ol
J"ri.g. f;t vertical units use veriical mounting bracket and self-
i*oin"o screws to hold furnace to floor (tabs on control box can be
;t:Ji i; t..r," irtnu."). For Vertical Kit Pan No see parts list'
Prooer duct installation is critical to operation of furnace When
i;r,!ili.; ,il.i;,'u*se muter,iars rated for continuous use at 200'F'
See minimum clearance to floorboards' walls & similar combustible
building materials.
Fach 4-inch duct openinq provides 12 in2 of discharge area' Provide
I" "-tir'iz i.'"oi n[n-.rot'""ole duct discharge area ior each
closeable register used
Use ol 2" ducting does not count toward achleving minimum
;.;;;g.lA;ir"ements. Ducting into dead air spacewith no return
;i;, ;;.i;h;lding tank areas,"do"s not count toward achievins
minimum discharge requirements'
nJir.iJr.tlng insltallation to obtain air rise of 100'F-130"F'
Figure 5

1.
2.
a
4.
E
. Horizontally installed furnaces - using side duct options - must
have a minimum of one duct from both lelt and right side of casing
FLEXIBLE DUCTING SYSTEMS
When designing flexible duct systems:
. Avoid sharp bends or crushed ducts.
. Stretch all ducts and run them directly to outlets, keeping quantity
and angles of bends to a minimum.
Remove knockout plates from desired outlets.
Attach a duct adapter to each opening by inserting flange over
casing, locking the tab into casing slot and turning adapter 90"
Attach and secure lour-inch flexible ducts to adapters.
Run ducts to desired location within RV, secure to registers.
Additional ducting may be needed to maintain correct static
pressure.
HARD DUCTING FLOOR SYSTEMS
When designing hard ducting systems:
o Undersized ducting will cause high temperature limiting.
. Oversized ducting will cause inadequate air flow from registers.
. When hard ducting is 1-112" in depth, an additional flex duct may be
needed to maintain installation duct static requirements.
. DO NOT install floor registers within 2 feet of return air openings.
- See ducting option from casing top and bottom areas. These
options can be with flex ducting or by hard ducting installations.
Hard ducting can be sealed using an optional gasket and plenum
plate kits. See parts list.
HORIZONTAL OR VERTICAL DISCHARGE
Figure 6
Units can be installed as bottom/top or vertical bottom discharge
systems.
Remove bottom / top discharge or side cover plate, these ducting
options must be connected to a ducting system.
lnsure sealing of all joints when use of a gasket and plenum plate
for hard ducting configurations.
Other methods of sealing furnace to the floor are acceptable as long
as clearances and seals meet requirements of clearances and
temperature.
Fasten plenum plate over floor cutout. lf a gasket and plenum plate
is not used seal furnace to hard duct system making sure seal is
airtight.
Position gasket on plenum over hole opening.
Set furnace on gasket; make sure gasket remains in position.
Additional ducting can be used to maintain correct static pressure or
as desired.
EXTENSION BOX DISCHARGE
INSIDE WALL
Figure 7
A plenum plate may be used for top or bottom discharge
installation.
A casing extension box adds 6" of depth to furnace casing. To order
see parts list.
Remove three knockouts from rear of furnace.
Place extension box with foam gasket against furnace, making sure
the three openings are enclosed within extension box. With
extension box held in place, secure with lwo 112" sheet metal
screws not provided.
3. Fasten plenum plate over cutout.
4. Position gasket on plenum plate.
5. Set furnace on gasket; make sure gasket remains in position.
6. Fasten extension box to floor with 1i4" sheet metal screws or
staples.
7. Additional ducting can be used to maintain correct static pressure or
as desired.
FLEX ADAPTER PLATE
Figure 8
A flex adapter may be used to provide more flexibility for alignment
of discharge opening on hard duct systems. This system can be
used on all models installed horizontally or vertically providing
ducting from rear of furnace without using side ducts. Use of a
flexible mounting plate kit is available. See parts list.
Remove three knockouts from rear of furnace.
lnstall duct adapters in each opening.
Place flex adapter plate with foam tape against hard ducting making
sure openings line up.
1.
2.
1.
J.
4.
5.
6.
7.
Floor cutout dimensions
BcD E
18" 1t2" 5" to 114"
Floor cutout dimensions
ABcD
8-1t2 s-'t/2" 6-1t4" 1t4"

4.
(
6.
7.
With plate held in place, fasten plate to ducting using screws or
staples as need to keeP it flat.
lnstall three duct adapters into flex adapter plate.
Attach flexible ducting from furnace to ilex adapter plate and secure
ducting in place on both ends.
Additional ducting can be used to maintain correct static pressure or
as desired.
PROPANE GAS CONNECTION
1. Connect gas line to brass fitting located on right side of Jurnace.
2. Some models will have fittings at the rear or right side outside of the
casing.
3. Be suie all male pipe threads, other than llare fittings, are treated
with a sealing compound resistant to the action of propane (LP)
gas. DO NOT put sealing compound on flare fittings.
4. Use two wrenches to hold brass fitting and flare nut when tightening
gas line to brass fitting. DO NOT iwist valve assembly.
Figure 9
. A 1/B" N.P.T. plug is accessible for test gauge connection on gas
valve assembly for pressure testing.
r A 3/8" flared fitting connection is provided at gas control valve inlet
for gas supply connection to furnace. The gas supply line of the
furnace must be of adequate size to provide 1 1" W.C. gas pressure.
This pressure must be mainiained under maximum llow conditions
with all gas appliances in operation.
. Remove slide plate and gas inlet plug from furnace.
. lnsert gas line ihrough gas inlet plug (DO NOT CUT).
o Connect gas line through gas inlet plug inside furnace casing
immediately ahead of gas control valve.
ELECTRICAL CONNECTIONS
A wanNrNrc
INJURY OR PROPERTY DAMAGE
. Label all wires before disconnecting for servicing. Wiring errors
can cause improper and dangerous operation. Verify proper
operation after servicing.
. Disconnect electrical power before servicing.
CONDUCTOR SIZING TABLE
- Maximum 10% Voltage Drop - (12VDC)
A "ou,o*
PROPERTY DAMAGE
This connection is for low-voltage battery or direct current only.
Do not connect to 120 or 240 volts AC.
. This furnace is designed for negative ground 12 volts DC only. DO
NOT attempt io alter lurnace for a positive ground system or
connect the f urnace directly to 120 volts AC. Damage to furnace
components will occur and warranty will be voided.
. Use a minimum of 1B GA wire to minimize voltage drop. Furnace
must be installed so electrical components are protected from
water. To make electrical connections see wiring diagrams.
. For best furnace performance when power supply is from a
converter equipped with a charging port, wire converter to furnace
parallel with battery. This provides consistent voltage to-furnace,
increasing component life, filtering power surges and AC spikes'
. Some models are shipped with a lield harness connections with 12"
wire leads on a terminal block.
. AII units are supplied with a power switch which when turned off
during servicing will remove power through furnace wiring. Switch
must be in the ON position for furnace to operate.
. The direct high voltage spark ignition generates a radio lrequency
that could cause interference with other microprocessor-based
equipment. Locate equipment at least five feet (5') from furnace
locaiion. lf this distance cannot be maintained a shielded high
voltage lead can be ordered. See parts list.
1. Route wiring to left side of lurnace.
2. Connect red wire to positive side of power supply.
3. Connect black wire to grounded side of power supply.
4. Connect blue wire marked positive thermostat to + side wire of
thermostat using 22-18 GA stranded wire.
5. Connect other blue wire to the other thermostat lead-using minimum
22-18 GA stranded wire.
POWER SUPPLY
Atwood Mobile Products highly recommends the use of an electronic
(solid state) converter with clean power output. This will assure the li{e of
ihe electronic controls and motor life could be extended beyond typical
linear converter applications.
THERMOSTAT INSTALLATION
o Thermostats are not supplied. To purchase a thermostat rated for
12VDC or 24VAC, Minimum 1 AMP rating, they can be ordered
through Atwood. See Parts list.
o Be sure all electrical power has been disconnected lrom the air
conditioner, furnace, and the power supply.
. The thermostats are very sensitive. HANDLE WITH CARE AT ALL
TIMES.
. Pick a dry area where air circulation is good.
. Do not install the thermostat where there are unusual heating
conditions: such as direct sunlight, heat producing appliances
(television, radio, wall lamp, etc.) or a furnace or air conditioner
output registers.
Locate thermostat 48" to 54" above main living area iloor on an
INTERIOR wall when possible.
EXTERIOR wall location must have a 3/4" spacer between
thermostat and exterior wall.
Follow manufacture's installation instructions provided with
thermostat.
Current draw (AMPS
Amps 45b78 9 10 iE
Gaqe Max. Lenqth of SAE conductor (ln feet) from source
18 F,7 43 34 29 25 21 19 17 '1 1
16 87 65 az /a ca 29 26 17

OPERATING INSTRUCTIONS
A wnnrurruc
FIRE OR EXPLOSION
Do not operate furnace while vehicle is in motion or being towed.
. During initial firing of this furnace, a burn-off of excess oils
remaining from manufacturing process may cause smoking or
fumes for 5-10 minutes.
. NOTE: if furnace should lock out, the blower will go off in 3 minutes
and remain off until unit is reset by reactivating the thermostat.
STOP! Read Users lnformation Manualsupplied with
furnace.
'1 . Turn the manual valve (if so equipped) or the valve at the outside
LP tank to the "OFF"" position DO NOT force. NOTE: This furnace
is equipped with a valve shut-off switch with switch in "OFF"
position. Gas will not flow to burner nor will the furnace operate.
Turn switch to "ON" position.
2. Set thermostat above room temperature to begin blower operation.
A slight delay will occur before the blower comes on. Allow blower
to run for 1 minute for combustion chamber purge cycle. lf blower
does not come on go to shut down and contact your dealer or a
' Iocal recreational vehicle service agency.
3. After 1 minute, the blower may not be running at this time, move
thermostat lever below room temperature. Wait approximately 2
minutes for blower to go otf.
4. Open manual shut-off valve (if so equipped) or the valve at the
' outside LP tank. Correct operation characteristics depend on the
valve being positioned fully open. Never attempt to operate with a
valve partially closed. Turn shut-off switch to "ON" position.
5. Set thermostat lever to desired setting. lf set above room
temperature, blower will come on.
6. Allow 30 seconds for main burner to light after blower comes on.
This furnace is equipped with an ignition device which automatlcally
lights the burner. DO NOT try to light the burner by hand.
7. lf burner does not light, repeat Steps 1 through 5.
B. lf after three (3) attempts with no ignition, go to shut down and
contact your dealer or a local recreational vehicle service agency.
Do not continue to cycle furnace through thermostat in an attempt to
get ignition.
To Shut Down
1. Set the thermostat to lowest setting, move lever to "OFF" position.
2. Turn manual shut off valve (if so equipped) to the "OFF" position.
Do not force.
SYSTEM CHECKS
A wannrnc
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.
PROPANE GAS PRESSURE TEST
The furnace and any individual shut-off valve must be disconnected from
gas supply piping system during any pressure testing of system at test
pressures of more than 1/2" PSl.
Before furnace is connected, piping systems must 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 must be maintained within a range of 10 to 14"
WC when all appliances are in operation. Test gas connections for
leakage with a leak test solution.
STATIC PRESSURE TEST
. Special tools required to take casing static pressures.
Please refer to Engineering addendum when installing the {urnace. This
will provide you with allowable maximum case static pressures with each
possible variation of duct configurations. The addendum is available from
you Atwood Field Service Representative or by calling Atwood Service.
Reducing the number of duct turns and stretching the ducts will increase
airflow and reduce static pressure. Adding ducts or increasing the
discharge (hard duct) system will also reduce static pressure.
You must follow the manufacture's recommendations and specifications
for optimum performance and proper operation.
IGNITION CONTROL DIAGNOSTIC CODES
The following charts give the diagnostic codes given by the ignition
control when faults are present.
. A soft lockout is a condition that is timed and will make additional
attempts to correct the problem. A hard lookout requires resetting oJ
the thermostat or turning the power switch oJf, then back on.
STANDARD 3 TRIES FOR IGNITION CONTROLS
DIAGNOSTIC CHART
FAULT LED INDICATION LOCKOUT
lnternal Circuit Board
Failure Steady On, No Flashing Hard
Limit Switch/Airflow
Problems 1-Flash With 3-Second Pause Soft
Flame Sense Fault 2-Flashes With 3-Second
Pause Hard
lgnition Lockout Fault 3-Flashes With 3-Second
Pause Solt
2.STAGE 3 TRIES FOR IGNITION CONTROLS
Note: (on LD models control ts not vtstble
DIAGNOSTIC CHART
FAULT LED INDICATION LOCKOUT
Low lnout voltaoe 1-Flash with 3 second oause Sofl
lonition failure 2-Flash With 3-Second Pause Soit
Open hiqh limit 3-Flashes With 3-Second Pause Soit
Stuck Sail Switch 4-Flashes With 3-Second Pause Hard
lonition fault 5-Flashes with 3-second pause Hard

THIS PAGE INTENTIONALLY LEFT BLANK.
CETTE PAGE EST INTENTIONNELLEMENT VIDE.

WIRING DIAGRAMS/DIAGRAMMES DE CABLAGE
85.IV WIRING AND LADDER DIAGRAMS
DIAGRAMMES EN ESCALIER ET CABALAGE 85-IV
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85.IV-LD WIRING AND LADDER DIAGRAMS
DTAGRAMMES EN ESCALIER ET CABALAGE 8s-tv-LD

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1522,2334 WIRING AND LADDER DIAGRAMS
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INTERRUPTEUR DE FIX
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