Figure 46
Connect gas supply piping (all fi ttings and
gas valve supplied by installer)
External manual gas valve
Union
Drip leg
From gas supply
Boiler gas connection
Figure 47
Gas valve inlet pressure inlet tap port #2
SVF
™
Series 1
Commercial Condensing Gas-Fired Water Boiler
— Boiler Manual
Part number 550-100-250/0819
47
5SE 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 gas line components.
Gas piping
Connecting gas supply piping
1. Connect gas supply piping to the boiler, see Figure 46 .
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 identifi ed by the installer.
2. Support gas piping with hangers or other devices, not by the boiler
or its accessories.
3. Use pipe dope compatible with propane gases (because natural gas
may contain some propane). Apply sparingly only to male threads of
pipe joints so that pipe dope does not block gas fl ow.
Failure to apply pipe dope as detailed above can result in severe
personal injury, death or substantial property damage.
SVF
boilers are shipped ready to fi re natural gas ONLY. You
must install the propane conversion kit if the boiler will be
connected to propane. See page 12 for instructions. Failure
to comply could result in severe personal injury, death or
substantial property damage.
Install a 100% lock-up gas pressure regulator as defi ned
by ANSI Z21.80 in the gas supply line if inlet pressure can
exceed 14” w.c. at any time. Lock-up regulators can have
pressure spikes of 5” w.c. or 150% of sett ing, which ever
is greater.
Adjust the lockup regulator for inlet pressure below 10"
w.c. with the boiler at minimum input rate. Th
is sett ing
provides a cushion below the sett ing of the high gas pres-
sure switch. Gas pressure can be adjusted higher or lower
as needed. Failure to comply could result in shutdown by
the high gas pressure switch, resulting in possible serious
property damage due to freeze-up.
Check Natural or LP gas supply pressure
1. Purge all air from the gas supply piping.
2. 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 piping
during any pressure testing greater than 20” w.c.
Do not check for gas leaks with an open fl ame — use a
soapy water bubble test. Failure to eliminate gas leaks can
cause severe personal injury, death or substantial property
damage.
Check Natural or LP gas supply pressure
1. Connect a manometer or pressure gauge to a hose barb fi tt ing (install-
er supplied) in port #2 in the side of the gas valve, see See Figure 47 .
2. Th
e pressure required at the gas valve test port (verify minimum gas
pressure when all gas appliances are in operation):
a. Minimum gas pressure, with gas fl owing — 3.5” w.c.
— verify during boiler startup, while boiler is at high fi re.
b. Maximum: certifi ed to 14” w.c. with no fl ow (lockup) or with
boiler on. Set the supply gas pressure regulator so the supply
pressure is far enough below 14” w.c. to ensure that varying
pressure conditions won’t trip the high gas pressure switch
(set at 14” w.c.). See 100% lock-up regulator Warning above.
Use port #2 for gas
pressure measurement
1
2
3
