750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
8-29
8.18 — Refractory
8.18.2 — Throat Tile and Liner
(Liner tiles not required for 100-200 HP.)
The throat tile must be installed to maintain an approximate inside diameter to match the burner housing, and be
centered in the furnace. Since the thickness of the furnace metal varies with the boiler design pressure, a shim of
appropriate thickness must be used to compensate for the variance. A layer or two of insulating board or equal, or
a bed of refractory material, may be used to center the ring. The liner tile can be fitted tightly against the furnace,
since the finished diameter is not critical.
It is recommended that the tile be dry-fitted, match-marked, removed, and then re-installed with the proper
amount of refractory cement. Thin joints (less than 1/16”) are desirable. Generally, it will be necessary to shave a
portion from one or more tiles to obtain a fit. If a fill piece is required, cut it to fit and install the piece at the bot-
tom of the furnace. When installing the housing, or the tile against the housing, liberally coat the surface with
refractory cement. Remove any cement that is squeezed out.
Allow refractory to air dry as long as possible. If immediate use is required, fire intermittently at a low rate for sev-
eral hours to thoroughly dry the refractory. For detailed information, request Bulletin C10-5921 from your local
Cleaver-Brooks representative.
8.18.3 — Installation
The following procedure is typical for all boilers with corrugated furnaces with the exception of steps 6, 7, and 8 —
disregard any reference to these steps when working with plain furnaces.
Refer to Figure 8-33.
1.
Install studs, bricking tool, cerafelt, bottom and top arch bricks as shown on DETAIL “A” to check for correct
fit up. If interference is present at the arch brick, measure this distance and trim inside diamter (I.D.) of all
bricks.
2.
Install the bottom half of arch bricks as shown on DETAIL “B”.
3.
Mix the vee block to a mortar-like consistency (per manufacturer’s instructions) and pack the front (3) valleys of
the funace corrugations with the mixture, flush with the furnace I.D. up to 3 o’clock and 9 o’clock from the cen-
terline of the furnace. Install both pieces of cerafelt to insulate the tile from the corrugation, and begin bottom
half of first row of tiles as shown on DETAIL “C” (see note #7 on Figure 8-33).
The area between the burner housing and throat tile requires a good seal. An improper or poor seal allows air leaks that
can cause overheating and burning of the burner housing metal. This area should be inspected semi-annually in order
to avoid damage to the equipment.
NOTE:
The arch bricks may need to be trimmed to match the burner housing I.D. on higher pressure boilers.
!
Caution
Summary of Contents for 4WI
Page 46: ...Burner Operation and Control 2 22 750 211 revised 2009 Promethean Boilers Model 4WI Manual...
Page 62: ...Waterside Care and Requirements 3 16 750 211 revised 2009 Promethean Boilers Model 4WI Manual...
Page 70: ...Sequence of Operation 4 8 750 211 revised 2009 Promethean Boilers Model 4WI Manual...
Page 114: ...Adjustment Procedures 6 28 750 211 revised 2009 Promethean Boilers Model 4WI Manual...
