Chimney Set-up
Since you have already preplanned the chimney run, you should know exactly how the installation is to be accomplished - how much pipe is required, the number of elbows, if any, and type of termination to be used.
CAUTION: REPORT TO YOUR DEALER ANY PARTS DAMAGED IN SHIPMENT, SPECIFICALLY CHECK THE END CONNECTION OF CHIMNEY SECTIONS AND ELBOWS.
NOTE: The CWC400 may use MHSC model SK8, or Model S (three wall) chimney systems. However, a TWABR adapter collar is required when using the Model S (triple wall) chimney system on this unit. The CWC500 is designed to use only the "S" triple wall chimney system. Either chimney system may be used, but must not be mixed.
NOTE: To use the TWABR adapter on the CWC400, remove and discard the cover plate on the top shield.
(Fig. 8)
Straight-Up Chimney Installation
To mark the centerline of the flue, put the fireplace in final position and measure out from the wall: 9¹⁄₄" (235 mm). Mark a spot on the ceiling directly above the fireplace. Draw a line parallel to the back wall through this mark. (Fig. 11)
Using a plumb bob positioned directly over center point of fireplace flue collar, mark the ceiling to estab- lish the chimney center point. (Fig. 11)
Offset Installation
In order to clear an obstruction, it may be necessary to offset chimney from vertical. This is accomplished by using MHSC elbows. Use the 30° Offset Elbow table on Page 5 to determine proper offset and parts required.
Each offset requires two (2) elbows. The second elbow is equipped with support straps. It is very important to install the second elbow in each offset as close to the ceiling or support as possible so the elbow straps can be secured to framing members to help support the weight of the chimney.
Determine offset distance of your chimney arrange- ment from centerline of fireplace to centerline of chim- ney where it is to pass through ceiling.
Locate center point of the chimney on ceiling as though a straight up chimney arrangement is to be used. Measure your offset dimension from straight up chimney center point on ceiling.
CWC Series Woodburning Fireplace
| Chimney Centerline |
Actual Centerpoint | |
| 9Z\v" |
| (235mm) |
| Plumb Line |
| Plumb Bob |
| Imaginary Cen- |
| terpoint |
| FPC556 |
Fig. 11 | Locate centerline of chimney with plumb line. |
Ceiling Chimney Hole/
Possible Obstructions
The size of the hole in ceiling will vary with the angle at which the chimney passes through ceiling.
Drive a nail up through ceiling at marked chimney center point. Go to floor above and see where hole will be cut. Check to see where existing ceiling joists and other pos- sible obstructions are located...i.e. wiring, plumbing etc...
If necessary, reposition chimney and/or fireplace to avoid obstructions.
Cutting the Hole
Cover fireplace collar opening and cut proper sized chimney hole in chimney. The SK8 pipe allows you to run pipe through a typical 16” on center joist without cut- ting joists.
87D1504