Boiler Manual - Weil-McLain

GV90+ gas-fired water boiler — Boiler ManualDIRECT VENT — Vertical with 3” concentricAllowable vent/air pipe materials &lengths1. The 3” concentric termination kit must be purchasedseparately.Use only the vent materials and kits listedin Figure 40, page 33. Provide pipe adaptersif specified.2. Locate the termination such that the total air pipingand vent piping from the boiler to the terminationwill not exceed the maximum length given inFigure 39, page 32.3. This termination requires a 45-degree elbow thatis not supplied with the termination kit. Themaximum vent/air pipe lengths include allowancefor this elbow.Determine termination locationLocate the concentric vent/air termination using thefollowing guidelines:1. The concentric vent/air assembly must terminateas shown in Figure 56, page 46.2. The termination must comply with the clearancesand limitations shown in Figure 41, page 35.3. Locate the termination so it is not likely to be damagedby foreign objects, such as stones or balls, orsubject to buildup of leaves or sediment.4. For Canadian installations, follow requirements ofCSA B149.1 or B149.2 Installation Code.Multiple vent/air terminations1. When terminating multiple GV90+ boilers, installthe concentric vent/air termination assemblies asdescribed in this manual.All vent outlets must terminate at thesame height to avoid possibility of severepersonal injury, death or substantialproperty damage.2. Place roof penetrations to obtain minimum of12 inches between centers of adjacent vent pipeof another boiler for U. S. installations (see Figure56, page 46).3. The air inlet of a GV90+ boiler is part of a directvent connection. It is not classified as a forced airintake with regard to spacing from adjacent boilervents.Prepare roof penetrations1. Roof penetration hole:a. Cut a 5-inch diameter hole to clear the 4½-inchtermination outside diameter.b. Insert a galvanized metal thimble in the ventpipe hole.2. Follow all local codes for isolation of vent pipe whenpassing through floors, ceilings and roofs.3. Provide flashing and sealing boots sized for theconcentric termination outside diameter.Figure 55 Installation sequence — Concentric verticalStep 1 Read and follow all instructions in this manual. DO NOTproceed with vent/air installation until you have readpage 29 through page 35.Step 2 Install the boiler in a location that allows proper routing ofall vent and air piping to the selected sidewall location.Step 3 Make sure the selected vertical termination location complieswith Figure 41, page 35. (Multiple boiler concentricterminations must also comply with Figure 56, page 46.)Step 4 Use only the vent materials listed in Figure 40, page 33.Provide pipe adapters where required.Step 5 Vent piping and air piping lengths must not exceed thevalues shown in Figure 39, page 32.Step 6 The concentric termination must be assembled and installedbefore piping from the boiler to the termination.Step 7 Prepare the vertical penetration(s) — assemble the concentrictermination kit and secure the penetration componentsas instructed in this section. Provide the supports indicatedand mount the termination assembly. See “Prepare roofpenetrations” on page 45 and “Mount concentric termination”on page 46.Step 8 Install vent and air piping between the boiler and theconcentric vent/air termination. Slope horizontal pipingdownward toward the boiler at least 1/4 inch per foot. Seepage 48 for general guidelines.Step 9 Install pipe supports every 5 feet on both the horizontal andvertical runs.Step 10 Install a hanger support within 6 inches of any upturn inthe piping.Part number 550-142-054/1211 45