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9. BOILER PIPING
entering the boiler, see Figure 4. Also consult I=B=R
Installation and Piping Guides.
If this Boiler is connected to heating coils located in
air handling units where they may be exposed to
refrigerated air, the boiler piping must be equipped
with flow control valves to prevent gravity circulation
of boiler water during the operation of the cooling
system.
H. Use a boiler bypass if the boiler is to be operated in a
system which has a large volume or excessive radia-
tion where low boiler water temperatures may be
encountered (i.e. converted gravity circulation system,
etc.).
Remove the circulator and install a pipe tee between the
circulator and boiler return along with a second tee in
the supply piping as shown in Figure 5. The bypass
should be the same size as the supply and return lines
with valves located in the bypass and supply outlet as
illustrated in Figure 5 in order to regulate water flow
to maintain higher boiler water temperatures.
Set the by-pass and boiler supply valves to a half
throttle position to start. Operate boiler until the
system water temperature is at a normal operating
range.
Adjust the valves to provide 180° to 200°F supply
water temperature. Opening the boiler supply valve
will raise the system temperature, while opening the
by-pass valve will lower the system supply tempera-
ture.
I. A hot water boiler installed above radiation level must
be provided with a low water cutoff device as part of
the installation.
J. OXYGEN CORROSION:
Oxygen contamination of the boiler water will cause
corrosion of the iron and steel boiler components,
which can lead to failure. As such, any system must be
designed to prevent oxygen absorption in the first
place or prevent it from reaching the boiler. Problems
caused by oxygen contamination of boiler water are not
Length
[Feet]
0.3 inch w.c. Pressure Drop 0.5 inch w.c. Pressure Drop
½¾11¼½¾11¼
10 132 278 520 1,050 175 360 680 1,400
20 92 190 350 730 120 250 465 950
30 73 152 285 590 97 200 375 770
40 63 130 245 500 82 170 320 660
50 56 115 215 440 73 151 285 580
60 50 105 195 400 66 138 260 530
70 46 96 180 370 61 125 240 490
80 43 90 170 350 57 118 220 460
90 40 84 160 320 53 110 205 430
100 38 79 150 305 50 103 195 400
CAUTION
Failure to properly pipe boiler may result in
improper operation and damage to boiler or
building.
A. CLEARANCES - Hot water pipes do not require
clearance from combustible construction.
B. Install drain cock and safety relief valve as shown in
Figure 4. Note - Safety relief valve must be in vertical
position.
C. Pipe safety relief valve discharge to floor.
D. Install circulator with flanges, gaskets and bolts
provided. Five foot long circulator harness allows
circulator to be mounted on supply or return. Connect
harness to circulator and secure any excess conduit.
E. For heating only system piping, see Figure 3. Consult
also I=B=R Installation Guides.
F. Space heating and domestic water heating with Alliance
water heater (intermittent circulation only). Install
Alliance water heater as a separate heating zone. Refer
to Alliance Installation, Operating and Service Instruc-
tions for additional information.
G. If this boiler is used in connection with refrigeration
systems, the boiler must be installed so that the chilled
medium is piped in parallel with the heating boiler using
appropriate valves to prevent the chilled medium from
WARNING
Safety relief valve discharge piping must
be piped near floor to eliminate potential
of severe burns. Do not pipe in any area
where freezing could occur. Do not install
any shut-off valves.