Operating Instructions; System Checks; Propane Gas Pressure Test; Static Pressure Test - Atwood 8516 Technical Lnstallation Manual

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