Install Instructions

53
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 specic
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.
(2) Comply with the boiler’s specic
water quality requirements. See the
Specifications Section of this manual.
(3) Comply with the boiler’s specic
requirements for minimum water ow
through the boiler, installing a system
bypass or primary-secondary loop if
necessary to maintain ow through the
boiler when serving small zones.
3. Overpressure
(1) Install a properly sized expansion tank.
(2) Do not exceed the boiler’s specic
requirements for maximum allowable
working pressure.
(3) Do not plug or block the relief valve.
4. Freezing
(1) Run all portions of the system piping
inside a heated space unless the system
is properly protected with an inhibited
antifreeze solution.
5. Overheating
(1) Comply with the boiler’s specic
requirement for minimum water ow
through the boiler. See the
Specifications Section of this manual.
(2) Install a low-water cutoff device
whenever the boiler is installed above
the level of the lowest heat emitter
or radiator. Also add a low-water
cutoff when required by local code
requirements.
It is recommended that the LWCO control
is installed above the boiler to provide
the highest level of protection. However,
where the LWCO control is approved
by the LWCO control manufacturer for
installation in a high boiler tapping of a