Weil-McLain Ultra Series 3 Quick Start Manual Download Page 4

TRIM OFF HERE

Ultr

a model

V

en

t or air 

pipe siz

e

• Allowable pipe sizes of vent/air piping

 

• Maximum equivalent feet of each

 

• Number of elbows allowed at these lengths

 

(All applications include allowance for the termination.)

Sidewall 

with 

W-M Plate

Sidewall 

with 

separate 

pipes

3” PVC Concentric 

Sidewall or Vertical

(Use only PVC pipe — 

DO NOT use 

CPVC or ABS)

Vertical 

with 

separate 

pipes

Length

Ells

Length

Ells

Length

Ells

Length

Ells

80/105

2” ** 100 

(ab)

2

100

2

100 

(ab)

1

100

1

3”

100

2

100

2

100

1

100

1

155

3”

100

2

100

2

100

1

100

1

230

3”

30 

(c)

2

30 

(c)

2

30 

(c)

1

30 

(c)

1

4”

100 

(d)

2

100

2

70 

(d)

1

100

1

299

4”

100

2

100

2

70 

(d)

1

100

1

399

4”

100

2

100

2

NA

100

1

Equivalent feet for elbows — deduct from maximum equivalent length of piping:
•  7 feet per for each 4-inch elbow & 2 or 3-inch 90° long-radius or 45° elbow 
•  16 feet for each 2- or 3-inch short-radius elbow

a  — 

Use 3"x2" reducer at boiler

b  — 

Use 3”x2” PVC reducers at termination

c  — 

Use 4”x3” reducer at boiler

d  — 

Use 4"x3" PVC reducers at termination

Stainless (AL29-4C) vent pipe

 — install an adapter at the boiler for all applications. 

Also install an adapter at the termination unless using separate-pipe termination.

**  Ultra-80 and 105 boilers installed with 2-inch vent piping automatically derate due 

to the pressure loss in the vent and air piping. The derate ranges up to 10% for the 

Ultra-80 at 100 feet or 15% for the Ultra-105 at 100 feet.

Items

Material

Standards for installations in:

United States

Canada

Plastic piping materials

Vent or air 

pipe  

fittings

PVC schedule 40 ANSI/ASTM D1785

Plastic vent 
pipe must be 
certified to UL 
S636 when 
required. 

Air pipe can be 
any of those 
listed at left if 
acceptable for 
local codes.

PVC-DWV

ANSI/ASTM D2665

CPVC schedule 40

ANSI/ASTM F441

ABS-DWV schedule 

40

ANSI/ASTM D2661

PVC & ABS 

pipe 

cement & 

primer

PVC

ANSI/ASTM D2564

CPVC

ANSI/ASTM F493

ABS

ANSI/ASTM D2235

AL29-4C piping materials

Vent pipe 

AL29-4C 

stainless 

steel

Heat Fab, Inc. 

Saf-T-Vent®

Z-Flex, Inc. 

Z-Vent II

Protech Systems 

FasNSeal™

Certified for 

Category IV 

and direct vent 

appliance 

venting

Certified for 

Category IV 

and direct vent 

appliance 

venting

  AL29-4C vent piping — Install a PVC-to-stainless adapter 

supplied by the vent pipe manufacturer at the boiler vent 

connection and at the termination (when using Weil-

McLain plate or concentric PVC termination). DO NOT 

mix piping from different vent pipe manufacturers unless 

using adapters specifically designed for the purpose by 

the manufacturer.

 

Plastic piping — Do not attempt to connect different 

types of plastic piping together.

 

Do not use cellular core pipe for vent or air piping.

Material checklist — vent and air piping

NOTE:   Also obtain all required flashings, boots, thimbles, fire stops or 

other items required for wall, ceiling and roof penetrations.

QUICK-START

QUICK-START

Pipe and fittings — Plastic

Material —

PVC   

CPVC   

ABS   

Size —

  2”   

  3”   

  4”   

ITEM

QTY

Straight pipe

feet

 

Elbows, 90-degree 

(include termination elbows if required)

 

Couplings 

(include termination if vertical separate pipes)

 

Return bend, 180-degree 

(vertical separate-pipe termination)

1

 

Reducers:     3"x2" 

            4"x3" 

 

Pipe and fittings — AL29-4C Stainless

Product —

Sa

f

-T-Vent

®

 

Z-Vent II   

FasNSeal™ 

 

Size —

  2”   

  3”   

  4”   

ITEM

QTY

Straight pipe

feet

 

Adjustable lengths

 

Elbows, 90-degree

 

Termination elbows (with integral screen), when req’d

 

Elbows, 45-degree

 

Adapter at boiler (to fit diameter of boiler connection)

 

Adapter at termination, if required

 

Items required for:

W-M P/N

QTY

Sidewall with Weil-McLain Plate

W-M sidewall term. kit        3" 

• 

   

      4"

383-500-397 

383-500-398

1

Included

 

with boiler

Includes W-M sidewall vent/air termination cap and 

inside/ outside cover plates and mounting hardware; 

openings are sized for PVC pipe.
3" cap is shipped with Ultra-80–155. 

4” cap is shipped with Ultra-230–399.

Sidewall with separate pipes

Inside and outside cover plates and mounting 

hardware supplied with boiler can be used at wall 

penetrations if size is the same as the pipe used.

 

Bird screens * 

3" 

• 

   

4"

383-500-105 

383-500-110

2

 

* For 2” pipe, trim 3” bird screen to size

Vertical with separate pipes

Bird screens (see note)  3" 

• 

   

4"

383-500-105 

383-500-110

2

 

* For 2” pipe, trim 3” bird screen to size

Coupling (1)

• 

Add to the table at right

180-degree return bend (1)

• 

Add to the table at right

3" PVC concentric termination, sidewall or vertical

Concentric termination kit, 3"

• 

383-500-350

1

 

Reducers: 3”x2” 

• 

 

 

  4”x3” 

 

 

Add to the table at right

 

Fold out the opposite page to see venting details.

33

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