1.4 BOILER CONNECTIONS
1.4.1 GENERAL
Do not run any pipes along the access panel side of
the boiler. Maintain clearances as shown on the
dimensional drawing for servicing of the boiler tubes.
Provide at least 36" from the gas train and burner,
unless a larger dimension is indicated on the
dimensional. All piping should be designed and
installed to avoid any loadings on the boiler
connections or piping.
1.4.2 FLOW CONNECTIONS
The system supply and return flow connections are
shown on the boiler dimensional drawing in this
manual. A gate valve and union should be on the
boiler outlet and inlet lines. This allows the boiler to be
isolated from the heating system for draining and
servicing. Use a tee, nipple, and cap on the boiler
inlet line to allow inspection and cleaning.
1.4.3 SAFETY RELIEF VALVE(S)
A connection is provided in the top of the boiler for the
relief valve. The relief valve discharge piping must be
the same size as the relief valve discharge opening.
Avoid over-tightening as this can distort valve seats.
All piping from relief valve must be independently
supported with no weight carried by the valve.
1.4.4 EXPANSION TANK CONNECTION
A connection is provided in the top of the boiler for
connecting piping to the expansion tank. This piping
should be installed as to avoid air entrapment in the
boilers.
1.4.5 DRAIN CONNECTION
A drain valve must be installed off of the boiler drain
connection, the same pipe size as this connection, to
allow draining of the boiler.
1.4.6 INDIRECT WATER HEATING BOILERS
When the boiler is to be used only for heating potable
(domestic) water or swimming pool water, the heating
system connections discussed above are capped.
The relief valve connections are still required. Water
connections are made only to the indirect heat
exchanger(s), according to the piping drawing
included in this manual. An automatic boiler fill valve
is provided with the boiler. This valve must be
connected to the fresh water system. With some
units, this connection is made to the heat exchanger
at the factory.
1.5 GAS SUPPLY CONNECTION - ATMOSPHERIC BOILERS
The installation must conform completely to the
requirements of the authority having jurisdiction,
or in the absence of such, requirements shall
conform in the U.S. to the current National Fuel
Gas Code, ANSI Z223.1-1984, or in Canada to
the current Installation Code for Gas Burning
Appliances and Equipment (CAN/CGA B149.1-
M91), or Oil Burning Equipment (CSA B139-
M91), and applicable regional regulations for the
class; which should be followed carefully in all
cases.
Drip leg
must be installed on gas supply piping.
Consult the local gas utility company
for
inspection and authorization of all gas supply
piping and flue connections.
The regulator vent line must be vented to outside
of building on any boiler equipment with electric
gas pilot ignition.
1.5.1 DRIP LEG
A drip leg, or sediment trap, must be installed in
the gas supply line. See Fig. 1.5A. The gas line
must be connected to a supply main at least as
large as the gas train connection at the boiler.
This connection should be made with a union so
that the boiler gas train components and burner
may be easily removed for service.
1.5.2 GAS PIPING LEAK TEST
After completion of the gas piping hookup, the
installation must be checked for leaks, using a
soap and water solution. Disconnect the boiler
and gas train from the gas supply piping during
any pressure testing.
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