Sterling QVSD - Manual (Page 13)

13
INSTALLATION (Continued)
5. Long runs of single wall combustion air piping passing
through an unheated space may require insulating
if condensation becomes noticeable.
6. The combustion air system must be installed to
prevent collection of condensate. Pitch horizontal
pipes downward 1/4 inch per foot (21mm/m) toward
the inlet cap to facilitate drainage. Vertical combustion
air pipes should be arranged as depicted in Figure 9.
7. The equivalent length of the combustion air system
must not be less than 5 feet (1.5m) and must not
exceed 50 feet (15.2m). Equivalent length is the total
length of straight sections PLUS 15 feet (4.6m) for
each 90° elbow and 5 feet (1.5m) for each 45° elbow.
NOTICE: For optimum performance, keep the
combustion air system as straight as possible.
8. Each slip joint must be secured with at least three
corrosion resistant screws. Two full turns of 3M #425
Aluminum Foil Tape or its equivalent must be used to
seal each joint. General Electric RTV-108, Dow-
Corning RTV-732, or an equivalent, may be used
instead of the tape.
9. For horizontal combustion air systems longer than 5
feet (1.5m), the system must be supported from
overhead building structures at 3 feet (1m) intervals.
EXHAUST VENTING - CATEGORY III
Never operate duct furnaces
without combustion air and fl ue gas piping in
place, or severe personal injury or death may
occur!
1. Vent system installation must be in accordance with
the latest edition of National Fuel Gas Code-NFPA
54, ANSI Z223.1 National Fuel Gas Code. In
Canada, installation must be in accordance with
CSA-B149.1 “Installation Code for Natural Gas
Burning Appliances and Equipment” or CSA-B149.2
“Installation Code for Propane Burning Appliances
and Equipment”.
2. A Breidert Type L or Fields vent cap furnished by the
customer, must be installed at the termination point
of the vent system, Figures 8 & 9.
3. Each unit MUST have its own vent system. It MUST
NOT be connected to other vent systems or to a
chimney.
4. Use UL 1738 listed single wall pipe for the vent
system. For installation in Canada, use corrosion
resistant and gas-tight, listed vent pipe conforming
with local building codes, or in the absence of local
building codes, with current CSA-B149.1, Installation
Codes for Natural Gas Burning Appliances and
Equipment or CSA-B149.2, Installation Codes for
Propane Gas Burning Appliances and Equipment.
Never use a pipe of a diameter
other than that specifi ed in Table 1, (“D” dia. fl ue
opening)! Never use PVC/ABS or other non-
metallic pipe for venting! To do so may result in
serious damage to the unit or severe personal
injury or death!
5. Any run of single wall vent pipe passing through an
unheated space must be insulated with an insulation
suitable to 550°F.
6. The combustion and exhaust vent air systems must
be installed to prevent collection of condensate.
Pitch horizontal pipes downward 1/4 inch per foot
(21mm/m) toward the terminal caps to facilitate
drainage (see Figure 8A). Vertical vent pipes should
be arranged as depicted in Figure 8.
7. The equivalent length of the vent system must not
be less than 5 feet (1.5m) and must not exceed 50
feet (15.2m). Equivalent length is the total length of
straight sections PLUS 15 feet (4.6m) for each 90°
elbow and 5 feet (1.5m) for each 45° elbow.
8. Each slip joint must be secured with at least three
corrosion resistant screws. Two full turns of 3M #425
Aluminum Foil Tape or its equivalent must be used
to seal each joint. General Electric RTV-108, Dow-
Corning RTV-732, or an equivalent, may be used
instead of the tape.
9. For horizontal vent systems longer than 5 feet
(1.5m), the system must be suppor ted from
overhead building structures at 3 feet (1m) intervals.
10. The exhaust vent system must remain at a minimum
of 6 inches (152mm) from all combustible materials.
Any part of the vent system that passes through a
combustible material must be properly insulated.
NOTICE: Increasing the clearance distance may be
necessary If there is a possibility of distortion or
discoloration of adjacent materials.
For a VERTICAL vent pipe section that passes through a
floor or roof, an opening 4 inches (102mm) greater in
diameter is required. The opening must be insulated and
fl ashed in accordance with applicable installation codes.
A HORIZONTAL section of an exhaust vent system that
passes through a combustible wall must be constructed
and insulated as shown in Figure 9A.
11. The top of a VERTICALLY VENTED exhaust system
must extend at least 3 feet (1m) above the roof
surface that it passes through. The point of
termination for a HORIZONTALLY VENTED exhaust
system must be at least 12 inches (305mm) from the
exterior wall that it passes through. See Vent System
Termination Clearance Requirements in Table 5. See
Vent/Intake Installations in Figures 8 & 8A.