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17 Primary/Secondary System Piping
System water piping methods
1. Connect boiler to system only as shown in Figure 45, page 38.
The primary/secondary piping shown ensures the boiler loop
2.
The table indicates the flow and head loss characteristics at that
with the listed criteria in the NOTICE
Figure 47, page 39 and match to an appropriate pump
speed.
illustrated in Figure 46, page 38
piping.
System circulators and zone circulators
3. Install a system circulator or zone circulators as shown in the
piping diagrams in the Primary/Secondary System Piping section
in this manual. These circulators must be supplied by the installer.
1. Size circulators based on the flow rate required to achieve the
temperature drop required. You can closely estimate temperature
where TD is temperature rise (or drop), FLOW is flow rate (in
FLOW
=
:
1.
to 210,000 Btuh. The desired temperature drop through the system
piping is 20°F. Then the required flow rate is:
FLOW
=
1.
against the head loss that will occur in the piping.
2. Determine the pipe size needed and the resultant head loss
using accepted engineering methods.
the head loss through the boiler.
Part number 550-142-850/0716
M
-
OUNT GAS
FIRED WATER BOILER
Figure 47, page 39.
boiler loop piping matches closely
=
See Figure 46, page 38
—
Boiler Manual
Expansion Tank Location
Figure 45, page 38
expansion tank. It is highly recommended that you locate
the air separator and expansion tank as shown in the sug-
gested piping drawings on pages 37 - 39.
Ensure that the expansion tank size will handle boiler and
sion. These tanks may be installed by connecting to tees in
the system piping.
Undersized expansion tanks cause system
makeup water to be added through the fill
locate the cold-water fill connection at the
expansion tank. Never locate this elsewhere.
Diaphragm- or bladder-type tank:
Figure 45
phragm- or bladder-type expansion tank.
Diaphragm- or bladder-type expansion
tank—Always check pressure and charge
tank with tank removed from system to be
sure reading is accurate. Boiler relief valve is
set for 30 PSIG.
pressure, should not exceed 24 PSIG to avoid
Figure 44
MAX
Boiler
Flow Rate
Model
20° F
temperature
rise
7.9
12.0
15.2
Flow Rate
MIN
Delta T1
Flow Rate
protection
50° F
67° F
temperature
temperature
rise
rise
2.9
2.3
4.3
3.4
6.1
4.5
-
-
-
37
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