Owner's Manual

36
10) The water heating load of 299,880 Btuh could be
handled by any one of the 810HE modules:
299,880 = (1) 810HE module
406,000
Example #2: an apartment building has 12 basins, 12
kitchen sinks, 14 showers, 12 dishwashers and 2 slop
sinks. The design space heating load is 772,000 Btuh.
Size the water heater and boiler.
Solution:
1) From Figure 2-15:
12 basins x ¾ units = 9 Fixture Units
+ 12 sinks x ¾ units = 9
+ 14 showers x 1½ units = 21
+ 12 dishwashers x 1½ units = 18
+ 2 slop sinks x 1½ units = 3
Total Fixture Units = 60
2) From gure 3-16 using curve “B” for apartment
houses, nd 27 gpm for 60 xture units.
3) Select a water heater having a capacity of 27 gpm
at 40-140° F temperature rise.
4) Calculate the water heater load: 27 x 8.33 x 60 x
100 = 1,349,500 Btuh
5) Calculate ratio = Water Heating
Space Heating
= 1,349,500 = 1.75
772,000
6) From Figure 3-17 and a ratio of 1.75 nd factor of
.84.
7) Net rating of boiler = .84 x 1,349,500 + 772,000 =
1,905,550 Btuh
8) Required modular Input =
1,905,550 Btuh x 1.44 = 2,744 MBH Input
1000 Btuh/MBH
9) Module selection from Figure 2-2 is (6) 809HE
modules.
10) Module Gross Output:
809HE
460 x .80 x 1000 = 368,000 Btuh
11) Number of modules in water-heating circuit:
1,349,500 = (4) 809HE
368,000 modules
3.13.3 The domestic water heater sizing procedures
outlined in this section are based on methods
recommended in the ASHRAE HANDBOOK and
Product Directory, Systems Volume, “Service Water
Heating” Chapter.
3.14 PIPING MATERIAL supplied on a Series 8H/8HE
packaged boiler, or in the water trim carton of a
Series 8H/8HE knockdown, consists of the following:
Quantity
1 Altitude Temperature & Pressure Gauge
2½” Dia., 60-320°F, 0-75 PSIG
1 ¾” ASME Safety Relief Valve set at 50 PSI—
ConBraCo or Watts
1 ¾” Drain Cock
1 ¾” Pipe Coupling—For Drain
1 2” x 10” Pipe Nipple—For Supply Piping
1 2” x ¾” x 2” Tee—For Supply Piping
1 ¾” x ¼” Pipe Bushing—For Supply Piping
1 ¾” x Close Pipe Nipple—Relief Valve Piping
1 ¾” x 2” Pipe Nipple—Relief Valve Piping
2 ¾” x 3½” Pipe Nipple—Relief Valve Piping and
Drain
1 ¾”—90° Ell—Relief Valve Piping
1 ¾” Tee—Relief Valve Piping
3.15 Piping components recommended for primary-
secondary pumping are depicted in Figure 3-3.
3.16 Installation procedure for optional ex couplings.
3.16.1 Pipe End Preparation
a) 4” ends of fabricated manifolds: with a manual
or automatic pipe cutter, cut 1-1/8” off each end
of the manifold to provide the proper gap between
pipe ends.
b) 1½” or 2” laterals of fabricated manifolds: with a
manual pipe cutter, cut 1½” off each of the 4” long
laterals to remove the pipe threads. Do not cut
the threads off the shorter 2½” long lateral, as this
connection is intended to be piped rigid to locate
the manifold during installation. If the manifold
is to be used for parallel pumping, do not cut the
threads off the laterals that are to be capped.
c) Deburr and clean pipe ends.
d) Special surface nish on pipe is not required.
Surface to be free of deep scratches, gouges, dents,
etc.
3.16.2 Joint Installation
a) Install retainer (1), gasket (2) and sleeve (3) on one
pipe end or manifold in sequence shown below.
b) Install remaining retainer (4) and gasket (5) on
other pipe end or manifold.
c) Position retainer (4) and gasket (5) to proper pipe
insertion depth “D”:
Pipe Size
Pipe Insertion Depth
Nominal Max. Min.
1-1/2" 1-3/8" 1.62" 1.16"
2" 1-1/2" 1.84" 1.18"
4" 2-1/16" 2.44" 1.74"
d) Slide sleeve (3) to gasket (5) and move gasket (2)
and retainer (1) into position as shown.
Pipe must be inserted to proper depth “D” into
both gaskets.