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5. Bond all above-ground gas piping to a
grounding electrode and ensure the piping is
electrically continuous.
DO NOT USE GAS PIPING AS A
GROUNDING ELECTRODE. Refer to
National Electrical Code, NFPA 70.
6. Install sediment trap, ground-joint union and
manual shut-off valve upstream of boiler gas
control valve and outside jacket.
7. When the piping is completed, test it for
leaks.
(1) When testing over ½ psig, disconnect
the boiler and its individual shut-off valve
from the gas supply piping.
APPENDIX C – Gas Piping (continued)
(2) When testing at ½ psig or less, isolate
boiler from gas supply piping by closing
boiler’s individual manual shut-off valve.
(3) Locate leaks using approved
combustible gas detector or
nonammable, non-corrosive leak
detection solution.
DO NOT CHECK FOR LEAKS USING
OPEN FLAMES such as matches or
candles or devices that spark.
8. Repair any detected leaks.
APPENDIX D – SYSTEM PIPING
USE PROPER DESIGN AND INSTALLATION PRACTICES and observe all local codes when
installing system piping. Property damage and injury may result from an improperly piped or
designed heating system.
i
Boiler damage caused by flawed system design or operation is excluded from our warranty.
Training and experience is required to design and install a piping system that will protect the boiler and
provide many years of comfort to the building occupants. Be sure to protect the boiler from the following
problems:
1. Corrosion
(1) Comply with the boiler’s specic
water quality requirements. See the
Specifications Section of this manual.
(2) Pressurize the system above the highest
net positive suction head (NPSH)
required for each circulator and ensure
positive pressure at the uppermost point
in the system.
(3) Maintain a closed boiler system using
heat exchangers to transfer heat to
open systems, such as domestic hot
water systems.
(4) Purge the system completely of
dissolved oxygen by bleeding all
radiators and installing a properly
installed air scoop or air vent.
(5) Repair leaking pipes, ttings, and vents
to minimize the need to add makeup
water.
(6) Do not ll the boiler with softened water
unless makeup water is extremely hard
and it is not possible to eliminate all
system leaks. If lling the boiler with
softened water, test regularly the water
softener regularly to ensure that brine
solution is not entering the boiler’s water
supply.
2. Lime scale
(1) Repair leaking pipes, ttings, and vents
to minimize the need to add makeup
water.