Boiler Manual - Weil-McLain

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GV90+ gas-fired water boiler — Boiler ManualDIRECT VENT — Vertical with 3” concentric (continued)Mount concentric termination1. Mount the termination as shown in Figure 57, page 46.2. Support the concentric vent/air termination at the roof penetrationas shown in Figure 57.• The supports/bracing used must support the termination assemblyto prevent vertical slippage or sideways movement.• The clamps used on the outside of the termination pipe mustnot cut into the pipe or contain sharp edges that could causea crack to form.The vent and air piping must be securely supported,and must not rest its weight on the boiler fittings. DONOT drill or screw into either the vent pipe or air pipe.Failure to properly support the vent and air piping couldresult in vent piping damage, resulting in possible severepersonal injury, death or substantial property damage.When inserting the partially-assembled terminationkit through the roof penetration, wrap plastic or otherprotection over the end of the exposed assembly to preventdebris from entering the pipes. If the air passagesbecome blocked, the boiler will not operate. Once therain cap has been cemented to the assembly, there is noway to correct the problem. The assembly would haveto be replaced if it were cut to be removed and cleaned.Altering the assembly in any way could result in severepersonal injury or death due to toxic flue product emissions.When using AL294C stainless vent pipe, use the ventpipe manufacturer’s PVC adapter when connecting tothe concentric vent attachment.Do not connect any other appliance to the vent pipe ormultiple boilers to a common vent pipe.3. After the assembly has been positioned in the roof opening andall supports have been attached, install a bird screen (purchasedseparately if not included with the kit) and rain cap as follows:a. Place the bird screen on the end of the inner pipe as in Figure58, page 47.b. Cement the rain cap in place.Figure 56 Vertical termination — 3” PVC concentric— single or multiple boilersFigure 57 3” PVC concentric termination supports46Part number 550-142-054/1211
GV90+ gas-fired water boiler — Boiler ManualConcentric termination assembly (sidewall or vertical)Figure 58 3” PVC concentric termination assembly — DO NOTattach the rain cap until the termination has beeninserted through the roof or wall and all supports havebeen installed.Assembling concentric termination1. See Figure 58, page 47 for the details of the terminationassembly.2. Prepare the bird screen (purchased separately ifnot included with the kit). Cut the bird screen tosize if required. If the bird screen must be trimmed,cut the bird screen to fit the outside diameter ofthe PVC inner pipe supplied with the terminationkit.3. Partially assemble the vent termination kit in thesequence shown in Figure 58, page 47.DO NOT install the rain cap and birdscreen until the assembly has been insertedthrough the roof (or sidewall)and all supports have been installed.Follow instructions to cover the end ofthe assembly with plastic before insertingthrough the roof penetration to preventdebris from blocking the air passages.4. Use the following procedures to prepare terminationcomponents and cement together.5. Deburr inside and outside of pipe ends.6. Chamfer outside of each pipe end to ensure evencement distribution when joining.7. Clean all pipe ends and fittings.8. Dry thoroughly.9. Dry assemble entire vent or air piping to ensureproper fit before assembling any joint.10. For each joint:a. Handle fittings and pipes carefully to preventcontamination of surfaces.b. Apply primer liberally to both joint surfaces —pipe end and fitting socket.c. While primer is still damp, lightly apply approvedcement to both surfaces in a uniformcoating.d. Apply a second coat to both surfaces. Avoidusing too much cement on sockets to preventcement buildup inside.e. With cement still wet, insert pipe into fitting,twisting ¼ turn. Make sure pipe is fullyinserted.If necessary, you can shorten the lengthsof the inner and outer pipes for a shorterfinished assembly. But you must ensurethe pipes butt correctly at both ends. Failureto properly assemble the concentrictermination can result in flue gas recirculation,causing possible severe personalinjury or death.Part number 550-142-054/1211 47
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Boiler Manual - Weil-McLain

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