User Guide

ManualsBrandsWeil-McLain ManualsBoiler PartsNG to LP Conversion Kit for AquaBalance 120 MBH Model Boilers

Figure 32 INSTALLATION SEQUENCE — Concentric vertical

Part number 550-100-325/0718

AquaBalance

SERIES 2 WALL MOUNT GAS-FIRED WATER BOILER — Boiler Manual

Allowable vent/air pipe materials &

lengths

1. The concentric termination kit must be purchased sepa-

rately.

Use only the vent materials and kits listed in Fig-

ure 21, page 17. Provide pipe adapters if speciﬁed.

2. Locate the termination such that the total air piping and

vent piping from the boiler to the termination will not

exceed the maximum length given in Figure 20, page 16.

3. This termination requires a 45-degree elbow that is not

supplied with the termination kit. The maximum vent/air

pipe lengths include allowance for this elbow.

For polypropylene applications, comply with

any additional requirements in the vent system

manufacturer’s instructions. (Do Not use 3” PVC

transition pieces at the boiler vent and air con-

nections)and at the termination if using a 3” PVC

concentric vent kit. Install a locking collar at every

joint.

For AL29-4C vent pipe applications, comply with

any additional requirements in the vent system

manufacturer’s instructions. Provide a AL29-4C

starter piece from the AL29-4C manufacturer to

the transition at the boiler vent connection. Air

pipe must be PVC or CPVC. Provide a 3” PVC

transition at the boiler air connection if using 2”

air pipe. Provide transition pieces to PVC at the

vent and air pipe termination connections.

Determine termination location

Locate the concentric vent/air termination using the following

guidelines:

1. The concentric vent/air assembly must terminate as shown

in Figure 34, page 28.

2. The termination must comply with the clearances and

limitations shown in Figure 22, page 19.

3. Locate the termination so it is not likely to be damaged by

foreign objects, such as stones or balls, or subject to buildup

of leaves or sediment.

4. For Canadian installations, provide clearances required by

CSA B149.1 or B149.2 Installation Code and a ULC S636

compliant vent kit.

Multiple vent/air terminations

1. When terminating multiple boilers, install the concentric

vent/air termination assemblies as described in this manual.

All vent outlets must terminate at the same height

to avoid possibility of severe personal injury,

death or substantial property damage.

2. Place roof penetrations to obtain minimum clearance of

12 inches between the edges of adjacent vent pipes of other

boilers for U. S. installations (see Figure 33, page 28).

3. For Canadian installations, provide clearances required by

CSA B149.1 or B149.2 Installation Code and a ULC S636

compliant vent kit.

4. The air inlet of a boiler is part of a direct vent connection. It

is not classiﬁed as a forced air intake with regard to spacing

from adjacent boiler vents.

13 DIRECT VENT — Vertical concentric

Step 1 Read and follow all instructions in this manual. DO NOT

proceed with vent/air installation until you have

read page 17 through page 20.

See

notices at left.

Step 2 Install the boiler in a location that allows proper routing of all

vent and air piping to the selected sidewall location.

Step 3 Make sure the selected vertical termination location complies

with Figure 22, page 19. (Multiple boiler concentric termina-

tions must also comply with Figure 33, page 28.)

Step 4 Use only the vent materials listed in Figure 21, page 17. Provide

pipe adapters where required.

Step 5 Vent piping and air piping lengths must not exceed the values

shown in Figure 20, page 16.

Step 6 The concentric termination must be assembled and installed

before piping from the boiler to the termination.

Step 7 Prepare the vertical penetration(s) — assemble the concen-

tric termination kit and secure the penetration components

as instructed in this section. Provide the supports indicated

and mount the termination assembly. See “Prepare roof pen-

etrations” on page 28 and “Mount concentric termination”

on page 28.

See notices at left.

Step 8 Install vent and air piping between the boiler and the concen-

tric vent/air termination. Slope horizontal piping downward

toward the boiler at least 1/4 inch per foot. See page 30 for

general guidelines.

Step 9 Install pipe supports every 5 feet on both the horizontal and

vertical runs.

See notices at left.

Step 10 Install a hanger support within 6 inches of any upturn in the

piping.

See notices at left.

USE SWEEP ELBOWS FOR ALL VENT AND

AIR PIPING — DO NOT use short radius elbows

for vent or air piping. Boiler performance could be

affected.