Vent Pipe System; General Chimney Requirements; Flue Pipe; Draft Regulator - John Wood JW6 F307 Installation And Operating Manual

Vent Pipe System

This water heater uses a non-direct, single-pipe vent system
to remove exhaust gases created by the burning of fossil
fuels. Air for combustion is taken from the immediate water
heater location or is ducted in from the outside (see "Air
Requirements" and "Vent and Exhaust Connections")
This water heater must be properly vented for the removal of
exhaust gases to the outside atmosphere. Correct installation
of the vent pipe system is mandatory for the proper and
effi cient operation of this water heater and is an important
factor in the life of the unit.
The vent pipe must be installed according to the current edition
of "Installation Code for Oil-Burning Equipment" (B139)
and all local codes.
The vent pipe installation must not be obstructed so as
to prevent the removal of exhaust gases to the outside
atmosphere.
Important:
•
The use of vent dampers is not recommended by the
manufacturer of this water heater. Although some vent
dampers are certifi ed by CSA International, this certifi cation
applies to the vent damper device only and does not mean
they are certifi ed for use on this water heater.
•
Certifi ed (listed) carbon monoxide (CO) detectors are
recommended in all applications and should be installed
using the manufacturer's instructions and local codes,
rules, or regulations.
•
The venting system must be installed by a qualified
technician.

General Chimney Requirements

All oil-heaters shall be connected to a chimney having
sufficient draft at all times to ensure for safe and proper
operation, except those heaters that are specifically certified
for other means of venting (JW6 F307V - Direct vent models).
For a burner designed for natural draft connect the vent to a
vertical chimney. Insufficient draft can cause flue gas leakage
and carbon monoxide emissions, which can lead to severe
bodily injury or death. Use vent material approved by local
codes for oil-fired burners. In the absence of such codes, refer
to the current edition of "Installation Code for Oil-Burning
Equipment" (B139).
Inspect existing chimney before installing the water heater.
Failure to do any of the following can result in serious property
damage, severe bodily injury or death:
•
Clean the chimney, including removal of blockage.
•
Repair or replace damaged pipe or liner.
•
Repair mortar and joints.
To prevent downdrafts, extend the chimney at least 1m (3 ft.)
above the highest point where it passes through the roof and
600mm (24 in.) higher than any portion of the building within
3m (10 ft.).

Flue Pipe

Note: Type "L" vent material is generally considered to be not
suitable for this application. Flue temperatures may exceed
300°C (572°F). Use flue piping approved for this installation.
Long horizontal flue pipes, excessive number of tees and
elbows or other obstructions restrict flue gas flow, and can
result in the possibility of condensation, flue gas leakage and
carbon monoxide emissions. These conditions can lead to
serious property damage, severe bodily injury or death. The
flue pipe should be the same size as the breech connection
on the appliance. The sizes generally are 150mm (6 in.) for
burners rated less than 1.00 GPH and 178mm (7 in.) for
burners rated 1.00 to 1.50 GPH. The flue pipe should be as
short as possible and installed so that it has a continuous rise
of 20mm/m (1/4 in./ft.) of horizontal length from the breech
connection on the appliance to the chimney. Elbows should
be minimized and the sections of pipe and fittings should be
joined with sheet metal screws and straps. Routing should
be made in such a way as to avoid sharp turns or unduly long
runs. It is recommended that the heater be piped to its own
individual flue. Where there is only one flue for both furnace
and water heater, various methods are practiced in which the
water heater flue enters the chimney above the main smoke
pipe. Also, a "Y" fitting is frequently used to combine the heater
and furnace flues, prior to entering the chimney connection
(see Figure 4, check with local authorities having jurisdiction).
Obtain a gas-tight seal to prevent possible flue gas leakage
and carbon monoxide emissions, which can lead to severe
bodily injury or death.

Draft Regulator

This device is used on conventional chimney venting only. It
automatically maintains a constant negative pressure in the
chimney to obtain maximum efficiency. If the chimney does
not develop sufficient draft, the draft control cannot function
properly. The heater must be equipped with an approved
draft regulator of adequate size. Ensure the draft regulator
diameter is at least as large as the flue pipe diameter. Follow
manufacturers recommended instructions for installation. It
must be installed in the flue pipe before it enters the chimney
and after the Blocked Vent Safety Switch. Set the draft
regulator at -0.03 in. w.c. (-7.46Pa), as measured in the flue
(between the heater and the draft regulator). Recommended
over-fire draft is -0.02 in. w.c. (-4.97Pa).

Chimney

Be sure that the chimney is sufficiently high and large enough
to meet the specifications of the burner unit installed. Check
that there is sufficient draft for the proper burning of oil. At least
-0.015 in. w.c. (-3.73Pa) of over-fire draft is recommended.

Blocked Vent Safety Switch

Oil-fired water heaters must be fitted with the blocked vent
safety switch supplied with your heater. The installation
procedure is given below. For further details and information
refer to the instruction sheet supplied with the switch (Not
required for JW6 F307V).
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