Despatch S Type - Manual (Page 9)

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13.
Slide front section in place making sidewall panel joints simultaneously, and using a 3'
level or plumb-bob, plumb the oven front and fasten as required to the sidewall panels
and floor channels. Refer to "S" Type Oven Front and Swing Door Installation in the
manual body and detail drawings for particulars.
14.
With tape line, measure diagonally corner to corner at top of panels and square up
accordingly, shifting rear corner panels in slotted roof angles.
15.
Starting at front of oven, set roof panels in place. See Illustration #1 for roof panel detail.
Check centerlines of panel duct openings against heater box openings as dimensioned
on oven body detail and heater details before fastening roof panels to roof angles with
self-drilling sheet metal screws.
16.
Fill voids formed by roof and wall panels with insulation provided, compressing slightly as
shown on Illustrations #3, #6, #7 and #8.
17.
Using self-drilling sheet metal screws fasten roof corner flashings. Fasten front and rear
flashings, then side flashing, cutting to length if required. Be sure to fasten oven front to
the roof angle or to the roof corner flashing (see your specific oven drawing).
18.
Following the supply duct assembly drawing and the duct detail drawing, assemble the
bottom corner portion of the heat supply duct at the floor and install both oven sidewall
duct runs, installing duct faces last. Work up the vertical runs and complete the
crossover duct at the roof, installing duct fronts last. Refer also to Illustration #9.
19.
Place a layer of 1" mineral wool insulation around the perimeter of the duct connection
outside of the collars. Insulation will pack down once the heater box is set down in place.
See Illustration #17 for illustrated procedure.
20.
Using lift truck or chain falls, lift and set heater box, with support channels attached, on
top of oven. Align duct openings in heater box with roof panel duct openings. Heater
unit weighs 1,200 to 3,000 pounds, depending on the size of the heater. Be safe, do not
overload your lifting equipment, and be sure to use an experienced rigger for this job. Do
not fasten heater down at this time. See Illustration #17 for complete procedure in
placing heater on top of oven.
21.
Slip supply duct collar through roof panel opening into supply opening in heater box and
fasten to roof panels with self-drilling sheet metal screws. Pack the void around the
heater box opening with insulation. Refer to Illustration #11. (Shift heater box unit if
necessary.)
22.
Slip return duct collar through roof panel opening into recirculation opening in heater box
and fasten to roof panels with self-drilling sheet metal screws. Pack the void around the
heater box opening with insulation. Refer to Illustration #10. (Shift heater box unit if
necessary.)
23.
Fasten supply duct/back units to roof panels and the vertical drops to the side panels.
See Illustration #9 for fastening details.
24. Fasten return duct or return baffle to roof panels with self-drilling sheet metal screws.
Refer to recirculation duct assembly drawing for assembly instructions and dimensional