Install Instructions

24
III: INSTALLATION INSTRUCTIONS (continued)
a. Type L or a factory built chimney material that
complies with the Type HT requirements of
ANSI/UL 103. Install in accordance with listing
and manufacturer’s instructions.
b. Steel pipe having resistance to corrosion and
heat with a minimum wall thickness of 24 Gauge
(0.024”).
DANGER
Any signs of condensate seepage at the base of
the chimney shall be inspected immediately. The
discoloration may be a sign of chimney damage
and must be remedied immediately.
Draft
1. The natural draft generated through a chimney is
dependent on several factors including, chimney
height, temperature of ue gases, cross section area
of chimney, chimney wall insulation value, dilution
air and total volume of ue gases, to name a few.
Make sure that the boiler has been running for at
least 5 minutes before measuring the draft.
2. Minimum Draft Overre – The draft induced by
a chimney must create at least a pressure of -0.02
inches water column (“ w.c.). The pressure at the
canopy cannot be positive since this could create
a condition that allows ue gas by-products to
escape from the draft regulator. A negative pressure
reading up to -.03 inches water column is acceptable
for proper operation.
Stack Temperature
1. The temperature of the ue gases has a signicant
effect on the amount of draft created in a vertical
chimney as well as the propensity to create
condensate. The higher the stack temperature, the
greater the amount of draft that can be generated. A
lower stack temperature not only reduces the amount
of draft that can be created but it also increases the
possibility that the ue gases could condense in the
chimney connector or stack.
2. NFPA 31 and CSA B139 have information to
help the installer make an appropriate choice of
venting materials. In some cases a chimney may
have to be lined to create sufcient draft. In other
cases, the chimney may have to be lined to prevent
the corrosion of a masonry chimney. Consult
with a chimney specialist knowledgeable on the
requirements for chimney requirements in your area.
CAUTION
Any doubt on the condition of a chimney or it’s
ability to prevent the generation and accumulation
of ue gas condensate, must be relined according
to NFPA 31 (United States) or CSA B139 (Canada).
CAUTION
Use the chimney venting tables as a guide. It
is highly recommended that any borderline
application should result in the relining of
the chimney with a suitable liner that creates
sufcient draft and to protect against corrosion
caused by ue gas condensate.
IMPORTANT
Single-pipe installations must be absolutely
airtight or leaks or loss of prime may result. Bleed
line and fuel unit completely.
M. FUEL UNITS AND OIL LINES
Single-Pipe Oil Lines - Standard burners are provided
with single-stage 3450 rpm fuel units with the by-pass
plug removed for single-pipe installations..
The single-stage fuel unit may be installed single-pipe
with gravity feed or lift. Maximum allowable lift is 8
feet. See Figure 19.
Two-Pipe Oil Lines - For two-pipe systems where
more lift is required, the two-stage fuel unit is
recommended. Table 5 (single-stage) and Table 6 (two-
stage) show allowable lift and lengths of 3/8-inch and
1/2-inch OD tubing for both suction and return lines.
Refer to Figure 20.
Figure 19: Single Pipe Oil Line