Trane GRAA - Maintenance

Final
Checkout
Run
the
unit
sequentially
through its
stages
of heat-
ing
and
cooling.
Once proper
unit
operation
is veri-
fied,
perform
these final
steps:
1. Inspect
unit
for debris
and/or
misplaced
t ools
and
hardware.
2.
Be sure
all gas
valves
and controls
are
in the
operating
position
if
the unit
will be operating
immediately.
3. Cycle
unit
on all
safety controls
to verify
proper
unit
operation.
4.
Confirm proper
operating
control
(thermostat or
ductstat)
operation
by cycling
unit.
5.
Secure
all exterior
panels in place.
VI .
MAINTENANCE
nace; swing
downward the piping
to clear
drawer.
3. Disconnect
duct furnace
gas valve wiring
taking
note
of all wire
locations.
Disconnect ignitor
and
flame
sensing
probe wires
at ignition
control
module
and any other
wires.
4.
Remove
the locking
screws
holding the burner-
drawer
assembly
in position.
5. Slide the
burner drawer
out of the
duct furnace.
6. Removal
of burners
is accomplished
by
sliding
burner towards
manifold,
compressing
locating
spring,
until the
rear of the
burner clears slot
in
back of burner
drawer.
7. With
burner drawer
removed
from duct
furnace,
inspect
the inside
surfaces
of
the
heat
exchang-
er. Wire
brush
if necessary.
8. Remove
any dirt,
dust or other
foreign matter
from
the burners
using
a wire brush and/or
com-
pressed air.
Insure
all parts of the
burner are
unobstructed.
Inspect
and
clean
pilot
burner if
necessary.
9.
Reassemble the
duct furnace
by replacing
all
parts in
order.
10. Light unit
per
the unit lighting
instructions.
These
units
have
been developed
for
outdoor instal-
lation.
Maintenance
is
required
and it
is suggested
that
the
following
unit
servicing
and
inspections
be
performed
routinely.
Also read
in entirety
and
refer to
the
Outdoor
Duct
Furnace
Manual for
maintenance
requirements.
Inspect
area near unit
to
be sure that
there
is no
combustible
material
located
within
the minimum
clearance
requirements
(See
Figure 2).
Service
pan-
els provide
easy
access to
the gas
controls
(located
in
duct
furnace
section),
the
blower
compartment,
the
electrical
cabinet
and the
supply plenum.
To
remove
the
service
door
from
any of these
compart-
ments,
refer
to
access panel
removal
section in
beginning
of this
manual.
The pilot
burner
can
be serviced
by removing
the
pilot
plate
from the
main
burner
drawer
assembly.
To
remove
the
main
burner
drawer
assembly
(also
refer
to
Outdoor
Rooftop
Duct
Furnace
Installation
and
Service
Manual)
for
servicing
the
burners,
pro-
ceed
as follows:
1.
Shut off
the
gas
supply
at the
gas shutoff
valve
and
electrical
power
to the
unit.
2.
Break
the
union
upstream
of
duct
furnace
gas
valve
and loosen
the
union
external
to the
fur-
11. Check
the
burner adjustment.
See
the
"Primary
Air
Adjustment'
section
of this manual.
12. Check all gas
control
valves
and pipe connec-
tions for
leaks.
13.Check the
operation
of the
duct furnace
gas
valve
by
lowering the
setting
of
the
thermostat,
stopping the
operation of the
duct furnace.
The
duct furnace
gas valve
should close,
extinguish-
ing the pilot
and
main burner flames.
14.
Inspect and service
the blower
section of
the
system.
The
unit should
be thoroughly
checked
before the start
and at the
end
of each heating
and cooling
season.
1. Motors
and belts
should
be inspected.
2.
Tighten
belts if
loose.
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