Operating instructions

a. listed Type B vent pipe
b. listed flexible vent liner
c. poured ceramic liner
5. Outside chimneys should not be used unless they are either:
a. enclosed in a chase
b. lined with Type B vent pipe
6. The vent connector from boiler to chimney should run as directly as possible with as few elbows as possible.
7. Where possible, it is recommended to common vent water heater and boiler. Each appliance must have its own vent connector. The 2 vent
connectors into chimney must be kept at least 6 in. apart. (See Fig. 7.)
8. If boiler is the only appliance connected to vent, Type B vent pipe is recommended for vent connector.
9. Slope pipe up from boiler to chimney not less than 1/4 in. per ft.
10. End of vent pipe must be flush with inside face of chimney flue. Use a sealed-in thimble for chimney connection.
11. The sections of vent pipe should be fastened with sheet metal screws to make piping rigid. Use stovepipe wires to support pipe from above.
12. Do not connect to fireplace flue.
13. Do not install a damper on this boiler.
PROCEDURE 2—MINIMUM VENT PIPE CLEARANCE
If vent pipe must go through a crawlspace, Type B vent pipe should be used. Where vent pipe passes through a combustible wall or partition, use
a ventilated metal thimble. The thimble should be 4 in. larger in diameter than vent pipe.
If boiler is installed with single-wall vent, it must have a 6-in. clearance between its surface and any combustible material.
Fig. 7—Common Venting with Hot Water Heater
A95197
INSTALL 3 x 4
INCREASER
HERE
H
VENT HEIGHT
HOT
WATER
HEATER
BOILER
D
COMMON VENT DIAMETER
D1
VENT
CONNECTOR
DIAMETER
VENT
CONNECTOR
RISE
6" MINIMUM
(NOTE 2)
R2
D2
R1

NOTES: 1.


2.
Consult National Fuel Gas Code or New Vent Sizing
Tables (A.G.A.) or Venting Tables Category 1 Central
Furnaces (G.A.M.A) for correct vent sizing information.
The two vent connectors entering the common vent
must be at least 6" apart vertically.
Fig. 8—Type B Gas Vent
A95196
CHIMNEY
SHEET METAL
FIRESTOP
THE VENT PIPE MUST BE AT
LEAST 2 FEET HIGHER THAN
ANY PART OF THE ROOF
WITHIN A 10 FOOT RADIUS
OF THE VENT.
VENT SYSTEM
THIMBLE
CLEANOUT
LINER
3' MIN
2' MIN
10'
—8—