48
Installation & Operation Manual
7
Gas connections
Connecting gas supply piping
1. Remove the top access panel and refer to FIG.’s 7-1 and
7-2 to pipe gas to the boiler.
a. Install ground joint union for servicing, when
required.
b. Install a manual shutoff valve in the gas supply
piping outside boiler jacket when required by local
codes or utility requirements.
c. In Canada – When using manual main shutoff
valves, it must be identified by the installer.
2. Install sediment trap / drip leg.
Figure 7-1 Gas Supply Piping - Models 81 - 211
3. Support piping with hangers, not by the boiler or its
accessories.
Do not check for gas leaks with an open
flame – use the bubble test. Failure to
use the bubble test or check for gas leaks
can cause severe personal injury, death, or
substantial property damage.
4. Purge all air from the gas supply piping.
5. Before placing the boiler in operation, check the boiler
and its gas connection for leaks.
a. The appliance must be disconnected from the gas
supply piping system during any pressure testing of
that system at a test pressure in excess of 1/2 PSIG
(3.5 kPa).
b. The appliance must be isolated from the gas supply
piping system by closing a manual shutoff valve
during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2 PSIG
(3.5
kPa).
c. The appliance and its gas connection must be leak
tested before placing it in operation.
The gas valve and blower will not support
the weight of the piping. Do not attempt
to support the weight of the piping with
the boiler or its accessories. Failure to
comply could result in severe personal
injury, death, or substantial property
damage.
WARNING
WARNING
6. Use pipe sealing compound compatible with propane
gases. Apply sparingly only to male threads of the pipe
joints so that pipe dope does not block gas flow.
Figure 7-2 Gas Supply Piping - Model 286
Failure to apply pipe sealing compound as
detailed in this manual can result in severe
personal injury, death, or substantial
property damage.
Knight boilers are typically shipped ready
to fire on natural gas. Check boiler rating
plate to determine which fuel the boiler
is set for. If set to natural gas, it may be
converted to LP by installing an orifice
(see page 13). In order to operate on LP
gas, an orifice MUST BE installed. Failure
to comply could result in severe personal
injury, death, or substantial property
damage.
WARNING
WARNING
