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30 | Installing the boiler
6
Installing the boiler
This chapter details how to install your boiler correctly.
The individual steps involved are:
• Connecting the flue
• Connecting the water pipes
• Making the electrical connections
• Fitting the burner
• Connecting the fuel supply
6.1
Flue pipe installation
6.1.1
Chimney venting
Connect boiler to vertical chimney with a 6" (150 mm)
vent pipe. Use only venting systems that comply with
local codes and regulations.
For oil boilers:
If local codes are not existent, refer the the following
regulations:
• NFPA 31, Installation of Oil-Burning Equipment,
• NFPA 211, Standard for Chimneys, Fire Places and
Solid Fuel Burning Appliances,
• In Canada refer to CSA B139, Installation Code for Oil-
Burning Equipment,
• NFPA 211 requires chimney to be lined before
connecting boiler.
For gas boilers:
If local codes are not existent, refer the the following
regulations:
• ANSI Z223.1/NFPA-54, National Fuel Gas Code.
• In Canada refer to CAN/CSA B149, Installation Code
for Gas Burning Appliances and Equipment.
Inspecting and cleaning existing flue
Before installing the new boiler, check and clean the old
flue system.
B Remove blockages and dirt from the chimney.
B Clean chimney.
B Repair or replace faulty sections.
B If necessary, repair chimney with mortar and joints.
Down drafts
To prevent down drafts extend chimney at
least 3 feet (0,9 m) above the roof opening
and at least 2 feet (0,6 m) above any part of
the roof within a radius of 10 feet (3 m).
6 720 648 162 (2011/08)
Minimum clearances to combustible material
Flue pipe
Type
Double-wall
L
Single-wall
L
Table 15 Minimum clearances to combustible objects for
flue systems
Minimum size of chimney
The minimum recommended chimney size is 8" x 8"
(200 mm x 200 mm)
(6 ¾ " x 6 ¾ " (170 mm x 170 mm) inside liner) or
6" (150 mm) diameter with a minimum height of 20 feet
(6 m). Use a 6" (150 mm) flue pipe for connection to an
existing chimney.
Installing the flue pipe
DANGER: Risk of death from escaping flue
gases.
If the resistance to flue gas flow is too great
and/or the flue pipe diameter is smaller
than the recommended size and/or the flue
pipe is too short:
B Seal all vent pipe joints.
B Install a CO alarm. Positive pressure
combustion ensures that the flue gas can
exit the flue system.
B Insert flue pipe 6" (150 mm) onto the breach and
secure with 2 screws.
Avoid long horizontal flue pipe runs and
keep the number of elbows to a minimum.
B Install flue connections between boiler and chimney
to slope up at least ¼ " (6 mm) per foot (0,3 m) to the
chimney.
B Connect the flue pipe to the chimney above the
bottom of the chimney to prevent blockages.
B Install cleaning and service hatches.
After starting the burner, set breeching draft to -0.01 to
-0.02 inches WC (2.5 Pa - 5 Pa) using a draft gauge. The
overfire pressure can be positive. If necessary, install a
barometric damper in the flue system to maintain the
underpressure in the system or to meet code
requirements. Always install the draft controller in
vertical position. Use a draft gauge when making
adjustments.
Minimum clearance
6" (150 mm)
18" (460 mm)
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