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6
III. Steam Piping and Trim
WARNING
Failure to properly pipe boiler may result in
improper operation and damage to boiler or
building.
A. Design and install boiler and system piping to prevent
oxygen contamination of boiler water.
Oxygen contamination sources are system leaks
requiringadditionofmakeupwater,ttings,and
oxygen permeable materials in distribution system.
Eliminate oxygen contamination sources by repairing
systemleaks,repairingttings,andusingnonpermeable
materials in distribution system.
B. Connect system supply and return piping to boiler.
Refer to Figure 4 for PIN3PV or Figure 5 for PIN4PV,
PIN5PV and PIN6PV. Also consult I=B=R Installation
and Piping Guides. Maintain minimum ½ inch
clearance from combustible materials.
C. Install Safety Valve in Tapping "E". See Figure 3. Use
¾ NPT x 3" nipple and ¾ NPT elbow provided. Safety
Valve must be installed with spindle in vertical position.
WARNING
Installation is not complete unless a safety valve
is installed.
WARNING
Safety valve discharge piping must be piped near
oor to eliminate potential of severe burns. DO
NOT pipe in any area where freezing could occur.
DO NOT install any shut-off valves.
D. Install Drain Valve in Tapping "D". See Figure 3. Use 2
NPT x ¾ NPT bushing provided.
E. Alliance Indirect Water Heater (if used). Refer
to Alliance Installation, Operating and Service
Instructions for additional information.
1. Supply and Return Piping. Connect supply piping to
Tapping "N" and return piping to Tapping "M". See
Figure 2. Install zone circulator and strainer in
supply piping. Install check valve to prevent gravity
circulation of boiler water.
2. Limit. Install temperature limit control (Honeywell
L4006A or equal) in Tapping "P". See Figure 3. Set
at 180°F to prevent steam production during non-
space heating periods.
NOTICE
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. 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.
Before using copper for steam piping, consider the following characteristics of copper piping:
1) high coefcient 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.