Independence Installation, Operating, and Service Instructions

17
103538-08 - 3/18
V. Piping and Trim
A. Design and install boiler and system piping to prevent
oxygen contamination of boiler water. Sources of
oxygen contamination are system leaks requiring
addition of makeup water, ttings, and oxygen
permeable materials in distribution system. Eliminate
oxygen contamination by repairing system leaks,
repairing ttings, using nonpermeable materials in
distribution system, and eliminating open tanks in
system, or isolating boiler from system with heat
exchanger.
B. Install Safety Valve in Tapping "E" (¾ NPT). See
Figure 21. Use ¾ NPT x 3" nipple and ¾ NPT elbow
provided. Safety Valve must be installed with spindle in
vertical position.
Figure 21: Trim Installation
WARNING
Safety valve discharge piping must be piped
such that the potential of severe burns is
eliminated. DO NOT pipe in any area where
freezing could occur. DO NOT install any shut-
off valves, plugs or caps. Consult Local Codes
for proper discharge piping arrangement.
C. Install Drain Valve in Tapping "F" (2 NPT bushed to
¾ NPT). See Figure 21.
D. Connect supply and return piping to heating system.
Maintain minimum ½ inch clearance from combustible
materials.
1. For STEAM HEATING see Figure 22. Consult
I=B=R, "Residential Hydronic Heating Installation
and Design Guide".
2. If boiler is used in connection with refrigeration
systems, boiler must be installed with chilled
medium piped in parallel with heating boiler using
appropriate valves to prevent the chilled medium
from entering the boiler. See Figure 23. Also
consult I=B=R, "Residential Hydronic Heating
Installation and Design Guide".
3. Boiler piping system of hot water boiler connected
to heating coils located in air handling units where
they may be exposed to refrigerated air circulation
must be equipped with ow control valves or other
automatic means to prevent gravity circulation of
boiler water during cooling cycle.
NOTICE
Before using copper for steam piping, consider the following characteristics of copper piping:
1) high coefcient of thermal expansion can induce mechanical stresses and cause expansion/
contraction noises if not accounted for in the piping system design and installation,
2) high heat transfer rate (heat loss) of uninsulated copper piping must be included in the normal
piping and pickup factors used to size the boiler,
3) soldering or brazing pastes and uxes that end up in the system can cause poor heat transfer,
surging, an unsteady water line and wet steam if not thoroughly removed during the boil out
procedure and,
4) galvanic corrosion of the adjoining metal may occur due to dissimilar metals in certain water
chemistries if dielectric unions are not used.
WARNING
Failure to properly pipe boiler may result in improper operation and damage to boiler or structure.
Do not use softened water in steam boilers. Accelerated boiler corrosion will result. Tie in fresh water
supply to the boiler upstream of a water softener.
Oxygen contamination of boiler water will cause corrosion of iron and steel boiler components, and
can lead to boiler failure. U.S. Boiler Company’s Standard Warranty does not cover problems caused
by oxygen contamination of boiler water or scale (lime) build-up caused by frequent addition of water.