Publicité
Les langues disponibles
Les langues disponibles
4. Place in operation the appliances being inspected.
Follow the manufacturer's instructions for lighting
each appliance. Adjust thermostat so appliance
will operate continuously.
5. Check the pressure at a pressure tap located 12
in. above the bottom joint of the first vertical vent
pipe. Pressure should be anywhere between -0.01
and -0.08 in. WC.
6. After it has been determined that each appliance
remaining connected to the common venting sys-
tem properly vents when tested as outlined above,
return doors, windows, exhaust fans, fireplace
dampers and other gas burning appliances to their
previous conditions of use.
7. Any improper operation of the common venting
system should be corrected so that the installation
conforms with the NFGC (U.S.) or B149 (Canada).
When re-sizing any portion of the common vent-
ing system, the common venting system should be
re-sized to approach the minimum size as deter-
mined using the appropriate tables in the NFGC
(U.S.) or B149 (Canada).
*Requires optional vent tee.
30
Fig. 27: Horizontal Through-the-Wall Venting (Category III)
Horizontal Through-the-Wall Venting
(Category III)
Installation
These installations utilize the heater-mounted blower
to vent the combustion products to the outdoors. Com-
bustion air is taken from inside the room and the vent is
installed horizontally through the wall to the outdoors.
Adequate combustion and ventilation air must be sup-
plied to the equipment room in accordance with the
NFGC (U.S.) or B149 (Canada).
The total length of the horizontal through-the-wall flue
system should not exceed 70 equivalent ft in length. If
horizontal run exceeds 70 equivalent ft, an appropri-
ately sized extractor must be used. Each elbow used is
equal to 10 ft of straight pipe. This will allow installation
in one of the four following arrangements:
•
70' of straight flue pipe
•
60' of straight flue pipe and one elbow
•
50' of straight flue pipe and two elbows
•
40' of straight pipe and three elbows
The vent cap is not considered in the overall length of
the venting system.
The vent must be installed to prevent flue gas leakage.
CAT III CERTIFIED
INSULATED
EXHAUST VENTING
*
Publicité
