Operating instructions

16
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, fittings, and oxygen
permeable materials in distribution system. Eliminate
oxygen contamination by repairing system leaks,
repairing fittings, using nonpermeable materials in
distribution system, and eliminating open tanks in
system, or isolating boiler from system with heat
exchanger.
B. Install Safety (Relief) Valve in Tapping "E" (¾ NPT).
See Figure 23. Use ¾ NPT x 3" nipple and ¾ NPT elbow
provided. Safety (Relief) Valve must be installed with
spindle in vertical position.
Figure 23: Trim Installation
4. If boiler is connected to heating coils located in air
handling units where they may be exposed to
refrigerated air, boiler piping must be equipped with
flow control valves to prevent gravity circulation of
boiler water during cooling system operation.
5. Use boiler bypass if boiler is operated in system
which has a large volume or excessive radiation
where low boiler water temperatures may be
encountered (i.e. converted gravity circulation
system, etc.).
a. Remove circulator and install tee between
circulator and boiler return along with second tee
in supply piping as shown in Figure 27. Bypass
should be same size as supply and return lines
with valves located in bypass and supply outlet
as illustrated in Figure 27 in order to regulate
water flow to maintain higher boiler water
temperatures.
WARNING
Failure to properly pipe boiler may result in improper operation and damage to boiler or
structure.
Oxygen contamination of boiler water will cause corrosion of iron and steel boiler
components, and can lead to boiler failure. Burnham'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.
WARNING
Safety (relief) 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 23.
D. Connect supply and return piping to heating system.
Maintain minimum ½ inch clearance from combustible
materials.
1. For STEAM HEATING see Figure 24. Consult
I=B=R Installation and Piping Guides.
2. For HOT WATER HEATING with Circulator
(forced) see Figure 25 and 25A. Consult I=B=R
Installation and Piping Guides.
3. 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 26. Also
consult I=B=R Installation and Piping Guides.