Gas Piping; Connecting Gas Supply Piping - Weil-McLain Boiler Installation Manual

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GAS FIRED WATER BOILER

Gas piping

Connecting gas supply piping

1. Remove jacket front panel and refer to Figure 13 to
pipe gas to boiler.
a. Install ground joint union for servicing, when
required.
b. Install manual shutoff valve in gas supply pip-
ing outside boiler jacket when required by lo-
cal codes or utility requirements.
c. In Canada — When using manual main shut-
off valve, it must be identified by the installer.
2. Wall-mounted boilers
a. Refer to separate Ultra Boiler Wall-mounting
instructions.
b. Gas connection may enter from the bottom of
boiler as explained in the Wall-mounting in-
structions.
Figure 13
14
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Installation Manual — Multiple-boiler Systems
Connecting gas supply piping
Use two wrenches when tightening gas piping at boiler, using one wrench to prevent the boiler gas
line connection from turning. Failure to support the boiler gas connection pipe to prevent it from
turning could damage components.
3. Support piping with hangers, not by boiler or its
accessories.
4. Purge all air from gas supply piping.
5. Before placing boiler in operation, check boiler and
its gas connection for leaks.
a. Close manual main shutoff valve during any
pressure testing at less than 13" w.c.
b. Disconnect boiler and gas valve from gas sup-
ply piping during any pressure testing greater
than 13" w.c.
Do not check for gas leaks with an open
flame — use bubble test. Failure to use
bubble test or check for gas leaks can cause
severe personal injury, death or
substantial property damage.
6. 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.
DO NOT adjust or attempt to measure
gas valve outlet pressure. The gas valve is
factory-set for the correct outlet pressure.
This setting is suitable for natural gas and
propane, requiring no field adjustment.
Attempting to alter or measure the gas
valve outlet pressure could result in
damage to the valve, causing potential
severe personal injury, death or
substantial property damage.
Ultra boilers are shipped ready to fire
natural gas ONLY. You must install the
propane orifice if the boiler will be
connected to propane. Failure to comply
could result in severe personal injury, death
or substantial property damage.
Part number 550-101-232/0703