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3.7 Piping
Gas Piping Overview
Before making the gas hook-up, make sure the boiler is being supplied with the type of fuel shown on
the boiler nameplate. If installing a dual fuel model, refer to section
each gas type.
The boiler shall be installed such that the gas
ignition system components are protected from
water (dripping, spraying, rain, etc.) during
appliance operation and service (circulator
replacement, control adjustment, etc.).
The boiler is factory fire-tested and adjusted for proper
combustion. The gas train components are certified to
handle a maximum inlet pressure of 14" W.C. (1/2 psig).
Typical gas pressure supply for natural gas is 7" W.C.
(11" W.C. for propane). If the available gas pressure
exceeds 14" W.C., a suitable additional intermediate
gas pressure regulator of the "lock up" type must be
provided to reduce the pressure to less than 14" W.C.
Refer to the table below or the appliance's label for the
minimum inlet gas pressure.
Natural Gas
Propane Gas
Note: When using a vented lock-up gas pressure regulator, the vent piping should be increased by
one pipe size for every 10 equivalent feet of length. Never connect vent piping that is small in size
than the gas regulator's vent port connection.
Install a sediment trap (drip leg) and a union connection ahead of the primary manual shutoff valve on
the boiler. A gas piping schematic is shown above. Gas piping should be installed in accordance with
National Fuel Gas Code, ANSI Z223.1, latest edition, and any other local codes which may apply; in
Canada see CAN/CSA-B.149.1, latest edition. In the Commonwealth of Massachusetts, the gas cock
must be a "T-handle type."
Appliance Size (BTU/Hr)
1,500,000
2,000,000
3,000,000
4,000,000
Revised: June 2, 2017
Released: June 2, 2017
SC-1500
SC-2000
3.5" W.C
4" W.C.
Natural Gas Requirement
(CFH)
1500
2000
3000
4000
HARSCO Industrial, Patterson-Kelley 2017
All Rights Reserved.
P-K SONIC
Technical Service 1.877.728.5351
4
to see the correct connection for
Simplified Gas Piping
SC-3000
3.5" W.C.
7" W.C.
Propane Gas Requirement
1004905978 P-K SONIC NURO Installation and
Owners Manual (Rev F Jun-2017).docx
®
Gas Fired Boiler
SC-4000
4" W.C.
(CFH)
590
788
1180
1574
Page 34
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