Carrier 61SW - Manual (Page 5)

An accessible manual shutoff valve shall be installed upstream of
the gas controls and within 5 ft of the gas boiler.
Place a ground joint union between the gas control manifold and
the manual gas shutoff valve, or use an approved flexible or
semi-rigid conductor.
Support all piping with the appropriate straps, hangers, etc. (1
hanger every 10 ft minimum).
Piping should be pressure tested before any appliance or shutoff
valve has been attached, in accordance with the requirements of
the local plumbing or gas code.
if the pressure exceeds 0.5 psig (14-in. wc), the gas supply pipe
must be disconnected from the furnace before the pressure test. If
the test pressure is equal to or less than 0.5 psig (14-in. wc), close
the manual shutoff valve located on the gas valve before the test.
If is recommended that the ground joint union be loosened before
pressure testing.
A WARNING
-Never-puige-aJine_intQ_a combustion chamber. Never use
matches, candlesrflameror-other-sources-of-ignition-forahe-
purpose of checking leakage. Use a soap-and-water solution
to check for leakage. After all connections have been made,
purge the lines and check for leakage.
Step 6—Venting
-This-is a-very-important-par.t-of_your heating system. It must be
clean, the right size, properly constructed and in GOOD CONDI­
TION.
1. Use local codes for installation or National Fuel Gas Code,
NFPA No. 54-1988/ANSI Z223.1-1988. It is very important to
properly size the venting system for induced-draft appliances.
Consult the New Vent Sizing Tables, available from A.G.A. or
Venting Tables Category I Central Furnaces, available from
Gas Appliance Manufacturers Association (GAMA) for cor­
rect sizing information.
2. These are high-efficiency boilers with a low stack or exhaust
temperature.
3. If venting into a masonry chimney without a liner, line
chimney from top to bottom with either:
a. listed Type-Bl vent pipe
b. listed flexible vent liner
c. poured ceramic liner
4. Outside chimneys should not be used unless they are either:
a. enclosed in a chase
b. lined with Type-Bl vent pipe
5. The vent connector from the boiler to the chimney should run
as directly as possible with as few elbows as possible.
6. The vent connector from the boiler to the chimney must be
4-in. pipe. The boiler’s induced-draft blower has a 3-in. outlet.
A 3- X 4-in. adaptor fitting is included in the parts bag. Locate
the adaptor fitting on the outlet of the induced-draft blower,
and ensure it is gastight with a bead of the furnished silicone
‘ sealant.
The boiler installation for chimney venting is not complete
unless the 3- x 4-in. adaptor fitting is located and secured.
7. Where possible, it is recommended to common vent the water
heater and boiler. Each appliance must have its own vent
connector. The 2 vent connectors at the chimney must be kept
at least 6 in. apart. (See Fig.'9.)
Fig. 9—Type»B1 Venting Through the Roof
—8.-Tf-the-hoiler is the only appliance connected to thejyejihj^ype^
B1 vent pipe is recommended for the vent connector.
9. Slope pipe up from boiler to chimney 1/4 iii. per ft.
10. End of vent pipe must be flush with the inside face of the
chimney flue. Use a sealed-in thimble for the chimney
connection.
11. 'The sections ofVenf’p^ipfrsIiouId'be'fastened'with-sheet-raetal-
screws to make the piping rigid. Use stovepipe wires to
support the pipe from above.
12. Do not connect to fireplace flue.
13. Do not install a damper on this boiler.
MINIMUM VENT PIPE CLEARANCE
If the vent pipe must go through a crawl space, Type-Bl 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 the vent pipe.