Amana AIR COMMAND 80 - BURNER OPERATION AND FLAME CHECK; GAS SUPPLY AND PIPING MANAGEMENT; Natural Gas Piping Installation

Tqe
sketch
below shows how the
filter
is retained
over
the bot-
tom return
air opening.
FILTER RETAINER
FILTER
FURNACE BOTTOM
Furnace
models
GU1070B40B, GU1090B50B,
GU1115B50B and
GUI140B50B are shipped with two
filters (refer to Pg.
2 for
size).
If
these
furnaces are
to be operated at
high speed, then two
return air connections
must
be
made. These may
be made on
both sides
of
the
furnace cabinet,
or on one side and the bot-
tom. If one of the
returns is connected
to the bottom, refer to the
chart above
for
proper filter size. Failure to have two
return air
connections,
when these
furnaces are operated on high speed
can result
in insufficient
airflow for air
conditioning
require-
ments and
excessive
air velocity
through the filter. If these
fur-
naces
will not be
run on
high
speed, one
return air connection
will
be
adequate.
Guide dimples
locate the
bottom or
side
cutouts. Use a
straight
edge
to scribe lines
connecting
the dimples.
Cut out the
open-
ing on these lines.
For
bottom return air connection the bottom
of
the
cabinet has to
be removed before
the furnace is
posi-
tioned
on the raised
platform or
set
on
top
of
the
return
air
duct.
It is a must
that
a
closed
return
duct
system
be
used,
with
the
return duct connected to
the furnace. Supply and
return duct
connections to the
unit may be made
with
flexible
joints to
mini-
mize
noise
transmission. If a central return is used, a
connec-
ting
duct must
be
installed
between
the
unit and the utility
room
wall
so
the furnace
blower will not interfere with
combustion air
or draft. The
room, closet
or
alcove
must not be
used
as
a
return
air chamber.
When
the
furnace
is used
in connection with a
cooling unit
the
furnace
should
be
installed
in parallel with
or on
the
upstream
side of the
cooling
unit to avoid
condensation in the
heating
element.
With a parallel
flow
arrangement, the
dampers
or
other means used to
control the
flow of air
should be
adequate
to
prevent
chilled air from
entering the
furnace
and if
manually
operated,
must be equipped
with means to prevent
operation of
either unit unless the
damper is in the
full
heat
or cool position.
GAS
SUPPLY AND
PIPING
The rating plate is stamped
with
the
model number,
type
of
gas and gas
input rating.
Make sure
the furnace is equipped
to operate
on
the type
of
gas available.
GAS
TYPE
SUPPLY
PRESSURE
MAX
MIN
Natural
Propane
10.0"
14.0"
5.0"
11.0"
Inlet
gas
pressure
must not exceed the
maximum value
shown in
table
above.
The
minimum
supply pressure
should not be varied
down-
ward because this
could
decrease the
heating capacity of the
furnace.
Gas input to the
burners
should not exceed the rated
input
shown on
the
rating plate.
HIGH
ALTITUDE DEBATE
When this
furnace is installed at
altitudes
above 2000 feet,
the
furnace
input must be derated
4%
for each 1000 feet
above sea
level
because the
density of the
air is reduced.
In some
areas
the gas
supplier will derate the
heating value
of
the
gas at a rate of 4% for
each 1000
feet above sea
level.
If he does not do so,
smaller
orifices
will
be required
at
altitudes above 3500 feet (non-derated
natural
gas)
or 4500
feet (non-derated propane).
A
different pressure switch
will
be required at
altitudes more
than 4000 feet above sea
level. This
is required
regardless
of
the
heat
content
of
the
fuel
used.
High altitude kits can be purchased
depending upon the
altitude and usage
of
propane
or natural gas.
Adjustment
of
the
manifold pressure to a
lower pressure
reading
than what is specified on the
furnace
nameplate is
not a proper derate procedure.
With
a lower density
of air
and
a
lower manifold pressure at the burner orifice, the orifice
will
not
aspirate the proper amount
of air
into the
burner.
This
can
cause incomplete
combustion of the gas, flash
back,
and
possible
yellow tipping.
GAS PIPING
®
CAUTION
To avoid possible
unsatisfactory opera-
tion or equipment damage due to
under -
firing of equipment, do not undersize the
natural
gas/propane
piping from the
meter/tank
to the furnace.
When
sizing
per
the tables, include
all appliances
that
could be operated
simultaneously.
The
gas
pipe
supplying
the
furnace
must be
properly sized
based
on
the
cubic
feet
per hour
of gas
flow
required,
specific
gravity
of the
gas and
length of
the
run. The gas
line
installa-
tion must
comply
with
local codes,
or
in the
absence
of
local
codes,
with the
latest
edition of
the
National
Fuel Gas
Code
ANSI
Z223.1.
NATURAL GAS CAPACITY
OF PIPE
IN CUBIC FEET
OF
GAS
PER HOUR (CFH)
Length of
Pipe in
Feet
Nominal Black Pipe Size
'/2 " 3
/
4 " 1"
1'/4"
1'/2 "
10
132
278 520
1,050 1,600
20 92 190 350
730 1,100
30 73
152 285 590 980
40 63 130
245 500 760
50 56 115
215 440 670
60 50 105
195
400 610
70 46 96
180
370
560
80 43
90 170 350 530
90 40
84 160
320
490
100 38
79 150
305
460
CONNECTING THE
GAS
PIPING -
NATURAL
GAS
Refer
to
Figure 6
for
the
general layout at the furnace.
The
following rules apply:
1. Use black
iron or steel pipe and fittings
for the
building
piping.
2.
Use pipe
joint compound
on male threads only.
Pipe joint
compound
must be
resistant
to the
action of the
fuel used.
3. Use ground
joint unions.
4. Install a drip leg to trap dirt and
moisture before
it can
enter the gas valve. The
drip
leg
must be a
minimum of
three
inches long.
5. Use
two pipe
wrenches when making
connection to the
gas
valve to keep it
from turning.
6.
Install a
manual shut-off valve.
7.
Tighten
all
joints
securely.
7