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VII. Venting
A. General Venting Guidelines
1. Install vent system in accordance with National
Fuel Gas Code, ANSI Z223.1/NFPA 54 or Natural
Gas and Propane Installation Code, CAN/CSA
B149.1 Installation Code for Canada, or, applicable
provisions of local building codes.
2. The AMP is listed as a direct vent appliance but can
also be used with indoor air for combustion.
a. Venting kits are available for outdoor installation.
3. Vent/combustion system materials that are
approved for use with the AMP appliances are listed
in Table 9. Venting manufacturers not listed in this
manual may be acceptable. It is the responsibility
of the installer or vent supplier to use compatible
adapters and materials.
a. It is recommended to consult with venting
professionals and designers when determining
the vent system for this appliance.
4. Enclose vent passing through occupied or
unoccupied spaces above the appliance with
material having a fire resistance rating at least equal
to the rating of adjoining floor or ceiling.
5. For flue gas venting, have horizontal runs sloping
upwards not less than ¼ inch per foot (21 mm/m)
from the boiler to the vent terminal.
6. This appliance operates under conditions that
permit condensation in the heat exchanger and the
flue gas venting. This appliance shall be installed
so as to prevent accumulation of condensate, and
where necessary, have means provided for drainage
of condensate.
7. If possible, slope horizontal combustion air pipe
minimum 1/4 in/ft (21 mm/m) downward towards
terminal. If not, slope towards the appliance.
8. It is recommended that a Carbon Monoxide
detector be installed and interlocked to the
appliance. Consult your local jurisdiction for
additional requirements.
B. Venting Design Requirements
At the discretion of the installing contractor, the
venting system can be designed by consulting
with approved venting engineers or by using the
equivalent length method in this manual.
1. Engineered Venting Method
Using the operating characteristics and required
conditions, an individual or common venting
system can be designed to ensure the reliability of
the appliance(s).
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WARNING
WARNING
This appliance must not be installed in a room
under negative pressure. These direct vent gas
fired appliances are allowed a maximum leakage
of 2% from the venting/combustion chamber and
8% from the air inlet portion when pressurized to
operating conditions in a neutral pressure room.
An equipment room under negative pressure
could deplete the combustion air supply to the
appliance and cause leakage of flue gas from the
venting system.
Exhaust fans installed in equipment rooms can
create negative pressure conditions strong enough
to cause nuisance shutdowns of the appliance.
NOTICE
NOTICE
Common venting with other manufacturers' ap-
pliances or different Thermal Solutions models is
prohibited.
It is the Responsibility of the installing contractor
or venting designers to comply with national and
local codes and follow best industry practices for
installing vent support, drainage, and pitch.
Do not exceed maximum vent/combustion air
system length.
a. Flue gas temperatures and flow rates can be
found in Table 12.
b. The combustion CO
Table 30.
c. The pressure at the flue outlet of the appliance
at any given firing rate must be within the range
of negative 0.25" W.C. to positive 0.5" W.C.
d. The pressure at the intake of the appliance at any
given firing rate must be within the range of 0.0"
WC to positive 0.1" WC.
e. Manifolded venting without backflow prevention
can allow flue gas from one appliance to interact
with the other appliances in the system. Common
venting systems must be designed with backflow
protection.
2. Equivalent length method: Do not exceed
maximum vent/combustion air lengths listed in
Table 6. Equivalent lengths of fittings are given in
Table 7.
and O
ranges are shown in
2
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AMP 400-1000L I&O Manual
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