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1.4.2) Duct recommendations
The proper sizing of warm air ducts is necessary to ensure
satisfactory furnace operation. Ductwork should be in accordance
with the latest editions of ANSI / NFPA-90A (Installation of Air
Conditioning and Ventilating Systems) and NFPA-90B (Warm Air
Heating and Air Conditioning Systems) or Canadian equivalent.
The supply air ductwork should be attached to the flanged front
opening provided at the discharge end of the furnace and the return
air ductwork should be attached to the flanged rear opening of the
furnace. See Figures 3.1 to 3.4, p. 14 and 15 for the dimensions of
these openings, based on the model selected.
The following recommendations should be followed when installing
ductwork:
a.
Install locking type dampers in all branches of the individual
ducts to balance out the system. Dampers should be adjusted
to achieve the desired static pressure at the outlet of the
furnace;
b.
A flexible duct connector of non-combustible material should be
installed on both the supply and return air sections of the unit.
On applications where an extremely quiet operation is
necessary, the first 3 m (10') of supply and return ducts should
be internally lined with acoustical material, if possible;
c.
In cases where the return air grille is located close to the fan
inlet, there should be at least one 90
inlet and grille. Further reduction in noise levels can be
achieved by installing acoustical air turning vanes or by lining
the duct as described in b. above;
d.
When a single air grille is used, the duct between the grille and
the furnace must be the same size as the return opening in the
furnace.
WARNING
Return air grilles and warm air registers must not
be obstructed.
CAUTION
When ducting supplies air to a space other than
where the furnace is located, the return air ducts
must be sealed and also be directed to the space
other than where the furnace is located. Incorrect
ductwork termination and sealing will create a
hazardous condition that can lead to bodily harm.
1.4.3) Venting instructions (chimney installation)
The furnace must be vented to the outside, in accordance with local
codes and other authorities having jurisdiction.
CAUTION
Oil fired appliances must be connected to flues
having sufficient draft at all times to ensure safe
and proper combustion.
For additional venting information refer to ANSI / NFPA 211
Chimneys, Fireplaces, Vents and Solid Fuel Burning Appliances
and/or CSA B139 Installation Code.
This furnace is certified for use with a Type "L" vent.
Pre-installation inspection of vent system
Before installing this furnace, it is highly recommended that any
existing vent system be completely inspected.
o
air turn between the fan
This inspection should include the following:
a.
Inspection for any deterioration in the chimney or vent. If
deterioration is discovered, the chimney must be repaired or
the vent must be replaced;
b.
Inspection to ascertain that the vent system is clear and free of
obstructions. Any blockages must be removed before installing
this furnace;
c.
Cleaning the chimney or vent if previously used for venting a
solid fuel burning appliance or fireplace;
d.
Confirming that all unused chimney or vent connections are
properly sealed;
e.
Verification that the chimney is properly lined and sized per the
applicable codes (refer to list of codes in section 1.2).
Masonry Chimney
This furnace can be vented into an existing masonry chimney.
However, it must not be vented into a chimney servicing a solid fuel
burning appliance. Before venting this furnace into a chimney, the
chimney must be checked for deterioration and repaired if
necessary. The chimney must be properly lined and sized per local
or national codes.
If the furnace is vented into a common chimney, the chimney must
be of sufficient area to accommodate the total flue products of all
appliances vented into the chimney.
Following are the preconditions for a safe venting system:
a.
Ensure that the chimney flue is clear of any dirt or debris;
b.
Ensure that the chimney is not servicing an open fireplace;
c.
Never reduce the pipe size below the outlet size of the furnace;
d.
All pipes should be supported using the proper clamps and/or
straps. These supports should be at least every 1.2 m (4');
e.
All horizontal runs of pipe should have an upward slope of at
least 2 cm per 1 m (1/4" per 1');
f.
All runs of pipe should be as short as possible with as few turns
as possible;
g.
Seams should be tightly joined and checked for leaks;
h.
The flue pipe must not extend into the chimney but be flush
with the inside wall;
i.
The chimney must extend 0.9 m (3') above the highest point
where it passes through a roof of a building and at least 0.6 m
(2') higher than any portion of a building within a horizontal
distance of 3 m (10'). It shall also be extended at lest 1.5 m (5')
above the highest connected equipment flue collar;
j.
Check local codes for any variances.
Factory Built Chimneys
The furnace may be used with an approved factory built chimney.
Refer to chimney manufacturer's instructions for proper installation.
1.4.4) Venting instructions
(Sealed Combustion System)
Refer to the sealed combustion system (VTK) Instruction Manual
(X40142).
1.4.5) Oil burner
This furnace is supplied with a high pressure atomizing retention
head type burner (for use with not heavier than grade 2 fuel oil). If
the burner model is a Beckett AFG, the mounting flange is fixed to
the burner air tube and no adjustment is required for insertion
length. If a Riello burner is used, refer to the Technical
Specifications, Table 3, p. 12 for the insertion length.
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