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V. Piping and Trim
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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
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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.
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.
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17
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