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III. Water Piping and Trim
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A.
Design and install boiler and system piping to
prevent oxygen contamination of boiler water.
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Oxygen contamination sources are system leaks
requiring addition of makeup water, fi ttings, and
oxygen permeable materials in distribution system.
Eliminate oxygen contamination by repairing system
leaks, repairing fi ttings, and using nonpermeable
materials in distribution system.
B.
Connect system supply and return piping to boiler.
See Figure 4A or 4B. Also consult I=B=R Installation
and Piping Guides. Maintain minimum ½ inch
clearance from hot water piping to combustible
materials.
C.
Install Circulator with fl anges, gaskets and bolts
provided. Five foot circulator harness allows circulator
to be mounted on supply or return. Connect harness to
circulator and secure any excess conduit.
D.
Install Safety Relief Valve. See Figure 4A or 4B.
Safety Relief Valve must be installed with spindle in
vertical position. Installation of the relief valve must be
consistent with the ANSI/ASME Boiler and Pressure
Vessel Code, Section IV.
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E.
Install Drain Valve in ¾" NPT connection in tee
provided. See Figure 1.
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F.
Space heating and domestic water heating with
Alliance water heater. Install Alliance water heater as a
separate heating zone. Refer to Alliance Installation,
t l
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Operating and Service Instructions for additional
r e
o
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information.
G.
If boiler is used in connection with refrigeration
systems, boiler must be installed with chilled medium
piped in parallel with the heating boiler using
appropriate valves to prevent chilled medium from
entering boiler, see Figure 3. Also consult I=B=R
Installation and Piping Guides.
l l i
H.
If boiler is connected to heating coils located in air
handling units where they may be exposed to
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refrigerated air, boiler piping must be equipped with
fl ow control valves to prevent gravity circulation of
boiler water during operation of cooling system.
I.
Use a boiler bypass if the boiler is to be operated in a
system which has a large volume or excessive radiation
where low boiler water temperatures may be encoun-
tered (i.e. converted gravity circulation system, etc.).
Install pipe tee between circulator and boiler return
along with second tee in supply piping as shown in
Figure 4A or 4B. Bypass should be same size as the
supply and return lines with valves located in bypass
and supply outlet as illustrated in Figure 4A or 4B in
order to regulate water fl ow to maintain higher boiler
water temperatures.
After the boiler is operational (reference Section VII.
System Start-Up) set by-pass and boiler supply valves
to half throttle position to start. Operate boiler until
system water temperature reaches normal operating
range.
Adjust valves to provide 180° to 200°F supply water
temperature. Opening the boiler supply valve will raise
system temperature, while opening the by-pass valve
will lower system supply temperature.
J.
A hot water boiler installed above radiation level
must be provided with a low water cut-off device as
part of installation.
If a low water cut-off is required, it must be mounted in
t s
b
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the system piping above the boiler.
The minimum safe water level of a hot water boiler is
just above the highest water containing cavity of the
a t
l l
boiler; that is, a hot water boiler must be full of water to
operate safely.
Refer to Section X for low water cut-off piping and
wiring instructions.
K.
If it is required to perform a long term pressure test of
the hydronic system, the boiler should fi rst be isolated
to avoid a pressure loss due to the escape of air trapped
in the boiler.
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