User Guide

2. Vent Kits Available for Use with this Boiler–ThefollowingventkitsareavailableforCPVC/PVCventsystemsinstalled

with this boiler in the USA:

  •107039-01–2”CPVC/PVCVentKit

  •107039-02–3”CPVC/PVCVentKit

These kits include the following:

  (1)30”CPVCStraightPipe

  (1)90degreeshortbendCPVCElbow

(1) Straight PVC Coupling (for exhaust terminal)

  (1)90degreePVCElbow(forintaketermination)

(2) Rodent screens

TheCPVCPipeandelbowsuppliedwiththesekitsarenotlistedtoULCS636andmaynotbeusedinCanada.

3. Maximum Vent and Air Intake Lengths-Themaximumlengthofthevent/airintakepipingdependsupontheventoption

selectedandtheboilersize.See Tables 7.5, 7.11 or 7.15 for the maximum vent lengths. These maximum lengths apply

toboththeventandintakepiping(e.g.Option1mayhaveupto60ftofintakeand60ftofventpiping).Forallvent

systems,thelengthsshowninTables7.5,7.11and7.15areinadditiontotherst90°elbow.Ifmoreelbowsaredesired,

the maximum allowable vent length must be reduced by the amount shown in Table 7.1 for each additional elbow used.

Terminationttingsarenevercounted.

ItisrecommendedthatalleldsuppliedPVCorCPVCelbowsbe“1/4Bend”(Sanitary90°El)or“LongSweep1/4Bend”

type elbows (Figure 7.2). In this manual “sanitary” and “long sweep” elbows are treated as having the same equivalent

length.

Example:

A 3” twin pipe horizontal CPVC/PVC vent system is planned for a horizontally vented 120MBH model which has the

following components in the vent system:

• 1 ft CPVC Straight Pipe

• 90 CPVC Elbow (short bend)

• 1-1/2 ft CPVC Straight Pipe

• Coupling

• 10 ft PVC Straight Pipe

• 90 PVC Elbow (Sanitary Elbow Design)

• 15 ft PVC Straight Pipe

• PVC Coupling Terminal

The Vent Option #2 column in Table 7.5 describes a horizontal direct vent system using 3” CPVC and PVC pipe. From this

column,weseethattheboilermayhaveaventlengthofupto135ft.TherstCPVC90degreeelbowisnotconsidered.From

Table 7.1, we see that the equivalent length of the 90 PVC elbow is 4ft and that the equivalent length of the coupling is 0ft.

The total equivalent length of the planned venting system is therefore:

1ft(StraightCPVC)+0ft(rstshortbendCPVC90Elbow)+1.5ft(StraightCPVC)+0ft(Coupling)+10ft(StraightPVC)

+ 4ft (PVC 90 Sanitary Elbow) + 15ft (Straight PVC) + 0ft (Coupling Terminal) = 31.5ft.

Since Table 7.5 shows a maximum allowable vent length of 135ft, the planned vent system length is acceptable

NOTICE

Do not exceed maximum vent/combustion air system length. Refer to Tables 7.5, 7.11 and 7.15 in this

section for maximum vent/combustion air system length.

Use only vent and combustion air terminals and terminal locations shown in Tables 7.5, 7.11 and 7.15

and related Figures.

NOTICE

When 3” venting is used with the 80 or 100 models, a 2” x 3” CPVC Increaser and a short length of 2”

CPVC pipe will be required to adapt from the 2” vent collar to the 3” components in the 107039-02 kit.

These items are not included in the kit itself.