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

8500-lv series
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Table of Contents
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

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