John Wood 4040SN-PDV Installation And Operating Instructions Manual Download Page 9

Page: 9 / 34

Vent Pipe Connection to Blower

A rubber coupling and gear clamps are supplied (Vent Kit)
with the water heater to connect the exhaust vent system to
the blower.

Important:

These connections must be properly sealed to

prevent the leakage of the products of combustion into the
living area.

Vent Pipe Installation

The following guidelines should be followed when installing
the air intake and exhaust vent system:
•

Venting should be as direct as possible with a minimum
number of pipe fittings.

•

Vent diameter must not be reduced unless specifically
noted in the installation instructions.

•

Support all horizontal pipe runs every 1.2m (4 ft.) and all
vertical pipe runs every 1.5m (5 ft.) or according to local
codes.

•

Vents run through unconditioned spaces where below
freezing temperatures are expected, are not recom-
mended.

•

Vents run through unconditioned spaces inside a build-
ing may result in the condensation of flue gases during
the winter season. The rubber coupling joined to the
blower includes a nipple with a yellow cap. In installa-
tions such as this connect a condensation trap to this
nipple.

The combustion air intake and exhaust vent system and ter-
mination may be installed in one of the following type termi-
nations:
1. Horizontal (2 Pipe) (air intake

and

exhaust vent)

2. Vertical (2 Pipe) (air intake

and

exhaust vent)

3. Concentric Vent Termination (using Concentric Vent Kit

side wall termination only).

All pipe, fittings, pipe cement, primers and procedures must
conform to American National Standard Institute and
American Society for Testing and Materials (ANSI/ASTM)
standards in the United States. This water heater has been
design certified by CSA International for use with the speci-
fied (CSA) listed plastic vent pipe.

Do not use solvent cement to connect the exhaust vent sys-
tem to the blower. Use the rubber coupling and gear clamps
instead. This connection must be removable to service the
heater. All other joints in the air intake and exhaust vent sys-
tems must be properly cemented. ABS cement must be
used to connect the 3 in. to 2 in adapter/reducer to air intake
on the water heater.

1. Cut the pipe end square and remove all ragged edges

and burrs. Make sure the inside of the pipe is clean and
free of cuttings and loose dirt. Chamfer the end and
apply primer to the fitting and pipe.

2. Using a suitable grade of pipe cement, apply a moder-

ate, even coat inside the fitting. Apply a liberal amount
of cement to the outside of the pipe to socket depth.

Note:

It is important to select the proper pipe cement for the

type plastic pipe being used.
3. Assemble the parts quickly while the cement is still wet.

Twist the pipe 1/4 turn during insertion and hold for 30
seconds.

Vent Pipe Length

The maximum allowable pipe lengths for air intake and
exhaust are listed in Table 1. The specified maximum
lengths are for

each

of the intake and exhaust systems and

not for the combined lengths of both systems. In addition,
each system requires a 45° long sweep elbow termination
with a restrictive screen. Minimum pipe length is 900mm (3
ft.) with a minimum of one 90° elbow per side.
1. Determine termination type and pipe size.
2. Determine number of elbows in vent system. Do not

include termination elbow. Calculate the maximum
equivalent length of the exhaust and air intake system.

CAUTION:

Use of Solvent Cement and Primer

• Use only in well-ventilated areas.
• Do not use near flame or open fire.
• Use only the Solvent Cement and Primer

appropriate for the venting material being
used.

• Solvent cements for plastic pipe are flam-

mable liquids and must be kept away from
all sources of ignition.

Model

number

Vent pipe

diameter

Concentric