(22) Remove the screws and lockwashers
5-17.
Combustion
Chamber
Assembly
securing the combustion chamber support channels
a. Removal.
to the heater and remove the channels from the
(1) Position
the heater suitable for working
heater.
underneath it.
(23) Slide the combustion chamber assembly
(2) Remove
the skid base.
carefully from the heater.
(3) Remove
the burner assembly (para 5-11).
( 2 4 ) Remove the screws securing the chamber
(4) Remove
the safety trip valve assembly
diagonal braces to the chamber and remove the
diagonal braces.
b. Inspection. Check for corrosion, cracks,
breaks, and wear.
c. Installation. Reverse the procedure in
a. a b o v e .
(5) Open the burner access door.
5-18.
Combustion Chamber
Cleanout
Covers
(6) Remove the nuts (3, fig. 5-3), the flat-
and Gaskets
washers (2), the lockwashers (1), and the screws
( 1 3 ) holding the burner access door assembly hinge
a. Removal.
to the heater.
(1) Refer to the procedures in paragraph 5-
11 a, sub-paragraph 1, 2 and 3.
(7) Remove the burner access door assembly
(7) from the heater.
( 2 ) Remove the screws from each of the two
(8) Remove the screws (5) from the cabinet
chamber cleanout covers (19, fig. 5-7), and take off
cover escutcheon ring (4) and take off the ring.
the covers.
(9) Remove the bolts, the nuts, and the
(3) Take out the two cover gaskets (18).
b. Inspection and Repair. Check for any dents,
washer from each end of the air duct supporting
channel (17, fig. 5-2) to free the channel.
holes, breaks, and cracks. Straighten the dents and
weld breaks and cracks.
( 1 0 ) Disconnect the return spring (5, fig. 5-6)
from the damper lever arm (4) and remove the
c. Installation. Reverse the
procedure
in
spring.
a. a b o v e , u s i n g n e w g a s k e t s .
(11) Remove the nuts, the lockwasher, and
5-19. Discharge Opening Dampers, Shaft
the bolt holding the damper pull rod (3) to the
With Handle, and Springs
damper lever arm (4).
a. Removal (fig. 2-1).
(12) Remove the rod by pulling it through
( 1 ) Remove the jamnut and the nut from each
from the outside of the heater.
o f the two screws on the handle end of the upper
(13) Remove the inner combustion air duct
damper.
(1) from the heater.
the f l e x i b l e e x h a u s t t u b e
NOTE
(14)
Disconnect
A S the damper opening shaft with handle is
union (13, fig. 5 - 7 ) a t t h e e n g i n e .
pulled out, a spacer washer and a coil spring will
(15) Remove the flexible exhaust tube from
fall from the handle.
the elbow at the combustion chamber.
(2) Remove the upper damper from the
(16) Remove the chamber mounting bolts
opining.
(25, fig. 5 - 2 ) . l o c k w a s h e r s , a n d p l a i n w a s h e r s .
(3) Remove the lower champer in the same
(17) Remove the screws (24) and the lock-
manner.
washers holding the combustion chamber support
b. Inspection and Repair.
channel braces to the heater to free the braces.
(1) I n s p e c t t h e d a m p e r s f o r p r o p e r o p e r a t i o n .
(18) Remove the screws holding the chamber
(2) Check the springs for adequate tension
diagonal brace to the combustion chamber support
and broken coils.
c h a n n e l . There is a diagonal brace on each side of
(3) Straighten any dents and weld all cracks
the chamber.
and breaks.
(19)
Support t h e c o m b u s t i o n c h a m b e r
c. Installation. R e v e r s e t h e p r o c e d u r e i n
assembly to prevent it from dropping out of the
a. a b o v e .
cabinet.
(20) Remove the screws and the washers
5-20.Flexible 6-Inch and 12-Inch
securing the chamber diagonal braces to the front
Duct Assemblies
of the heater.
a . Removal, Inspection, and Installation. R e f e r
(21) Remove the nuts holding the vertical
to paragraph 3-8 and 3-9.
baffles to each side of the combustion chamber
b. Repair. Make minor repairs to the canvas
exhaust ducts and remove the baffles.
ducts and hand sew patches over the damaged
