Co-Venting - Retrofitting; Vent Terminations Installation Precautions - DeDietrich C230 ECO-A 120 Installation, Operating And Service Manual

7 Flue gas discharge and air supply
34
7.1.7 Co-venting – Retrofitting
At the time of removal of any existing boiler from a common vent
system, the following steps shall be performed with each remaining
appliance connected to the common vent in operation and not in
operation. This boiler must not be co-vented with a category I or III
appliance. The boiler must have a vent damper installed when co-
venting with other appliances.
1. Any used opening of the vent system be properly sealed
2. Visually inspect the venting system for proper size and horizontal
pitch. Determine there is no blockage, restriction, leakage,
corrosion and other deficiencies that could cause an unsafe
condition.
3. Close all building doors, windows and all doors between the
appliances which remain connected to the common venting
system and other space of the building. Turn on clothes dryers,
exhaust fan at maximum speed and any appliance not connected
to the common vent system, close fireplace dampers. Do not
operate a summer exhaust fan.
4. Place in operation each of the appliances installed in the common
vent system being inspected. Follow the lighting instructions.
Adjust thermostat so appliance will operate continuously.
5. Test for spillage near and around each of the gas appliances after
5 minutes of main burner operation.
6. After determining that each appliance remains connected to the
common venting system properly vents when tested as outlined
above, return all doors, windows, exhaust fan, fireplace dampers
and any other gas burning appliance to their normal positions.
7. Any improper operating of the venting system must be corrected
so the installation conforms to both ANSI Z223.1/NFPA 54 or
CAN/CSA B149.1 gas installation codes. When resizing any
portion of the common venting system, the common venting
system shall be resized to approach the minimum size as
determined using the appropriate tables in Part II of ANSI
Z223.1/NFPA 54 gas code &/or CAN/CSA B149.1 natural gas and
propane installation code.
7.1.8

Vent terminations installation precautions

[Consult national & local codes for other requirements]
All exhaust terminations for conventional chimney must be finished
with a finishing cone with tapered end, with a bird/rodent screen. All
direct vent and sealed combustion systems must be finished with TEE
termination type, the combustion air inlet must be a 90° and must be
provided with a debris/bird-rodent screen. All terminals shall be
arranged to avoid and prevent the accumulation of flue gas
condensation.
In all installations avoid vent termination locations where excessive
debris or snow could accumulate leading to blocking of the vent
terminals or where prevailing winds and rain could enter the vent
terminal creating additional resistance to the venting system.
C230 ECO-A