Operating instructions

PROCEDURE 1—CHECKING CHIMNEY
The chimney is a very important part of heating system. It must be clean, the right size, properly constructed, and in GOOD CONDITION. No
boiler can function properly with a bad chimney. Table 4 gives typical chimney sizes. Fig. 4 shows how a boiler might be vented to a chimney.
Note that height (HT) is measured from vent pipe to top.
PROCEDURE 2—CHIMNEY SIZING
Chimney sizing and all other aspects of vent installation must be in accordance with Part 7 NFGC Venting of Equipment and applicable provisions
of local building codes.
In Canada, follow CAN/CGA B149.1 and B149.2 Installation Codes for Gas Burning Appliances and Equipment.
PROCEDURE 3—CONNECTING VENT DAMPER AND VENT CONNECTOR
Refer to Fig. 1 for size and location of vent (flue opening). Use 28 gauge (minimum) galvanized pipe to connect to chimney.
IMPORTANT: The damper blade on factory-supplied vent damper has a 1/2-sq in. hole (approximately 3/4-in. diameter). On boilers equipped
with standing pilot, hole MUST be left open. On boilers equipped with intermittent ignition, hole should be plugged using plug supplied with vent
damper.
1. Position factory-supplied vent damper on top of flue outlet collar. Fasten damper securely to flue outlet collar with at least two sheet metal
screws spaced 180° apart. Make sure damper blade has clearance to operate inside of diverter.
On 2-section boilers equipped with vent damper, the factory-supplied 4-in. vent damper is equipped with a 3-in. to 4-in. adapter so that the
4-in. vent damper may be installed on boiler’s 3-in. flue outlet collar. Fasten all fittings with sheet metal screws.
As An Option (U.S.A. Only): The damper may be installed in any horizontal or vertical position (closer to the flue outlet collar preferred).
Follow diagrams shown in Fig. 5, 7, and 8.
2. Install vent damper to service only the single boiler for which it is intended. The damper position indicator shall be in a visible location
following installation. Locate damper so that it is accessible for servicing.
3. The damper must be in open position when appliance main burners are operating.
4. The boiler is equipped with a factory-wired harness that plugs into vent damper.
5. Vent pipe must be same size as flue outlet collar, except 2-section boilers with vent damper as noted above.
6. Slope pipe up from boiler to chimney not less than 1/4 in. per ft.
7. Run pipe as directly as possible with as few elbows as possible.
8. Do not connect to fireplace flue.
9. End of vent pipe must be flush with inside face of chimney flue. Use a sealed-in thimble for chimney connection.
10. Horizontal run should not be longer than 3/4 the chimney height (HT). (See Fig. 4.)
The sections of vent pipe should be fastened with sheet metal screws to make piping rigid. Horizontal portions of vent system must be supported
to prevent sagging. Use stovepipe wires every 5 ft to support pipe from above. If vent pipe must go through a crawlspace, double-wall 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.
Fig. 2—Typical Hot Water Piping
A03116
SUPPLY
MAIN
AIR
PURGER
FILTROL
TANK
LIMIT
CONTROL
RELIEF
VALVE
COLD WATER
INLET
AIR VENT
GAUGE
RETURN
LINE
CIRCULATOR
Fig. 3—Chilled Water Piping
A95143
VALVES A & B
OPEN FOR HEATING;
CLOSE FOR COOLING
TO SYSTEM
A
B
C
D
WATER
CHILLER
VALVES C & D
CLOSE FOR HEATING;
OPEN FOR COOLING
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