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103536-13 - 2/24
MegaSteam
Installation & Service Manual
A. EVALUATE THE EXISTING STEAM SYSTEM.
The single most important factor in determining
the expected life cycle of a steam boiler, is
the amount of fresh water added to the boiler
during operation. Fresh water brings minerals
and oxygen into the boiler. These contaminants
greatly accelerate corrosion of the cast iron boiler
sections.
1. Assure that all system radiators, piping and
vents are absolutely leak tight.
a. When a steam boiler is installed in an
existing system, ALL air vents should be
replaced at the same time. This assures that
the new boiler will not be compromised by
existing system leaks.
b. If the system contains hidden supply or
return piping (hidden behind walls, buried
in concrete, etc.) pressure test this piping to
assure there are no leaks.
2. Repair any leaks in the system.
3. Install accurate water meter on the fresh water
supply to the boiler.
B. CONNECT SYSTEM SUPPLY AND RETURN
PIPING TO BOILER.
See Figure 3-3 for piping
details. Also, consult Residential Hydronic
Heating Installation and Design I=B=R Guide.
CAUTION
Maintain minimum ½ inch clearance from hot
water piping to combustible materials.
C
. Gravity Return Piping Kit. (Optional)
1. Assemble Gravity Return Piping Kit for
MST288, MST396 and MST513 as illustrated in
Figure 3-3 for Recommended configuration or
Figure 3-7 for Dropped Header configuration.
See Table 2-2 for Recommended material
provided or Table 3-6 for Dropped Header
material provided for Boiler Models MST288,
MST396 and MST513.
2. Assemble Gravity Return Piping Kit for
MST629, MST758 and MST892 as illustrated in
Figure 3-5 for Recommended configuration or
Figure 3-9 for Dropped Header configuration.
See Table 3-4 for Recommended material
provided or Table 3-8 for Dropped Header
material provided for Boiler Model MST629,
MST758 and MST892.
Note: Tighten unions only after all piping is in the
proper position. Recommend using Pipe Dope
or Teflon Tape on all threaded surfaces.
!
WARNING
Failure to properly pipe boiler may result in improper operation and damage to boiler or structure.
Do not increase steam boiler input above the ratings.
!
3
Steam Boiler Piping & Trim
NOTICE:
Boiler manufacturer does not recommend use of copper pipe for the following reasons:
1. High coefficient of thermal expansion can induce mechanical stresses and cause expansion/ contraction
noises if not accounted for in piping system design and installation,
2. High heat transfer rate (heat loss) of uninsulated copper piping must be included in normal piping and
pickup factors used to size the boiler,
3. Soldering or brazing pastes and fluxes 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 skimming procedure and,
4. Galvanic corrosion of adjoining metal may occur due to dissimilar metals in certain water
chemistry if dielectric unions are not used.
WARNING
•
Do not use softened water in steam boilers. Accelerated boiler corrosion will result. Tie in fresh water supply
to 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. Check for and correct system leaks.
!
