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MACH® Series
Gas-Fired Boiler Installation
Page 13
Intake Termination Details
3.6.13 Vent Elbows
The turn from horizontal to vertical should be made
with two 45º ells or with one long radius 90º ell for
best operation. Do not use "short radius" ells.
3.7
GAS PIPING
Before making the gas hook-up, make sure the boiler
is being supplied with the type of fuel shown on the
boiler nameplate.
The boiler shall be installed such that the gas ignition
system components are protected from water
(dripping, spraying, rain, etc.) during appliance
operation and service (circulator replacement, control
replacement, etc.)
The boiler is factory fire-tested and adjusted for proper
combustion with natural gas supply pressure of 7”
W.C. Typical gas pressure supply for natural gas is
7" W.C. (11" W.C. for propane). The gas train
components are certified to handle a maximum inlet
pressure of 14" W.C. (1/2 psig.). If the available gas
pressure exceeds 14" W.C., a suitable additional
intermediate gas pressure regulator of the "lock up"
type must be provided to reduce the pressure to less
than 14" W.C.
WARNING!
All threaded connections must be made using a
pipe compound that is resistant to the action of
liquefied petroleum gases. Do not use Teflon
tape on gas line threads.
Gas Piping
In the Commonwealth of Massachusetts, the gas cock
must be a “T-handle type.”
Note: Install a sediment trap (drip leg) and a union
connection ahead of the primary manual shutoff valve
on the boiler. Gas piping should be installed in
accordance with National Fuel Gas Code, ANSI
Z223.1, latest edition, and any other local codes
which may apply; in Canada see CAN/CGA-B.149.
Note: See Pipe Capacity for Natural Gas chart on the
following page for required pipe size, based on
overall length of pipe from meter plus equivalent
length of all fittings. Approximate sizing may be
based on 1 cubic foot of natural gas per 1,000 Btu per
hour input, i.e., 500,000 Btu per hour requires about
500 cubic feet per hour. (See "Typical Boiler
Operating Conditions," Section 4.3, for more
information.)
Meter
(not supplied)
Shutoff
(on boiler)
Natural Gas
Supply
By Installer
Remote Gas Shutoff
(not supplied)
Union
Drip Leg
Field Provided
Inlet Screens
Recommended
Termination
Centering
Support Plate
Sealant
Outside Plate
Cover Plate
Fastener
Sealant
12" min.