35
Installation & Operation Manual
6
Gas connections
Connecting gas supply piping
1. Refer to FIG. 6-1 to pipe gas to the boiler.
a. Install ground joint union for servicing, when
required.
b. In Canada – When using manual main shutoff
valves, it must be identified by the installer.
Figure 6-1 Gas Supply Piping
2. Support piping with hangers, not by the boiler or its
accessories.
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
5. 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.
Failure to apply pipe sealing compound
as detailed in this manual can result in
severe personal injury, death, or substantial
property damage.
WARNING
Model
Gas Inlet Size
2500
2"
3000
2"
3500
2"
4000
2 1/2"
5000
2 1/2"
Table 6A Gas Inlet Size
DIR #2000529669 00
SEDIMENT TRAP
GAS LINE
CONNECTION
Natural gas supply pressure requirements
1. Pressure required at the gas valve inlet pressure port:
• Maximum 14 inches w.c. (3.5 kPa) with no flow
(lockup) or with boiler on.
• Minimum 4 inches w.c. (.99 kPa) with gas flowing (verify
during boiler startup).
2. Install 100% lockup gas pressure regulator in supply line
if inlet pressure can exceed 14 inches w.c. (3.5 kPa) at any
time. Adjust lockup regulator for 14 inches w.c. (3.5 kPa)
maximum.
Maximum inlet gas pressure must not exceed
the value specified. Minimum value listed is
for the purposes of input adjustment.
NOTICE
WARNING
Ensure that the high gas pressure regulator
is at least 10 feet (3 m) upstream of the
appliance.
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. 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.
WARNING
Check boiler rating plate to determine
which fuel the boiler is set for. Power-
fin boilers CANNOT be field converted.
Failure to comply could result in severe
personal injury, death, or substantial
property damage.
Natural gas:
Pipe sizing for natural gas
1. Refer to Table 6B on page 37 for pipe length and
diameter. Based on rated boiler input (divide by 1,000 to
obtain cubic feet per hour).
a.
Table 6B is only for natural gas with specific gravity
0.60 inches, with a pressure drop through the gas
piping of 0.3 inches w.c.
b. For additional gas pipe sizing information, refer to
the National Fuel Gas Code, NFPA 54 / ANSI Z223.1
- latest edition, or in Canada CSA B149.1 Installation
Code.
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.
WARNING
