Connecting Gas Supply Piping; Natural Gas; Gas Piping - Weil-McLain Ultra Commercial Installation And Start-Up Manual

COMMERCIAL GAS

Gas piping

Connecting gas supply piping

1. Remove jacket front panel. See
pipe to the boiler.
a. Install a union for servicing, when required.
b. Install a manual shutoff valve in the gas supply piping, within
6 feet of the boiler.
c. In Canada, the manual gas valve must be identified by the
installer.
2. Support piping with hangers, not by the boiler or its accessories.
3. Purge all air from the gas supply piping.
4. Before placing the boiler in operation, check the boiler and its gas
connection for leaks.
a. Close manual main shutoff valve during any pressure testing
at less than 20" w.c.
b. Disconnect the boiler gas connection from the gas supply pip-
ing during any pressure testing greater than 20" w.c.
Do not check for gas leaks with an open flame — use
a soapy water bubble test. Failure to eliminate gas leaks
can cause severe personal injury, death or substantial
property damage.
5. Use pipe dope compatible with propane gases. Apply sparingly
only to male threads of pipe joints so that pipe dope does not
block gas flow.
Failure to apply pipe dope as detailed above can result
in severe personal injury, death or substantial property
damage.
Ultra boilers are shipped ready to fire natural gas ONLY.
You must install the propane conversion kit if the boiler
will be connected to propane. See page 9 through page 11
for instructions. Failure to comply could result in severe
personal injury, death or substantial property damage.
Install a 100% lockup gas pressure regulator in the gas
supply line if inlet pressure can exceed 14" w.c. at any
time. Adjust the lockup regulator for 7 to 10" w.c. inlet
pressure. This setting provides a cushion below the set-
ting of the high gas pressure switch. Failure to comply
could result in shutdown by the high gas pressure switch,
resulting in possible serious property damage due to
freeze-up.

Natural Gas:

Pipe sizing for natural gas
1. Size gas supply piping from meter outlet to entrance of boiler in
accordance with Figure 54 and Figure 55.
2. Use the total input of all boilers. Divide the total input in Btuh by
1,000 to obtain cubic feet per hour of natural gas.
a. Pipe lengths in Figure 54 are equivalent lengths of straight pipe.
Use Figure 55 to determine equivalent length of fittings.
b. Figure 54 is only for natural gas with specific gravity 0.60, with
a pressure drop through the gas piping of 0.30" w.c.
c. For additional gas pipe sizing information, refer to ANSI Z223.1
(or B149.1 or B149.2 for Canadian installations).
Part number 550-100-086/0809
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FIRED WATER BOILER
Figure 51 to connect gas supply
— Boiler Manual
to prevent the boiler gas line connection
from turning. Failure to support the
boiler gas connection pipe to prevent
it from turning could damage gas line
components.
Connect gas supply piping
Location of gas train inlet pressure tap
Gas valve
High gas
pressure switch
Low gas
pressure switch
Remove plug and connect manometer at
this point.
, using one wrench
Tee
49