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Example – A 120MBH model is to be connected to a heating system as shown in Figure 9.6. A total of 20 ft of straight pipe
will be installed between the boiler and the system loop.
Count all fittings in the boiler loop (shaded in Figure 9.6):
3 90° Elbows
2 Turn in Tee (under boiler- primary-secondary tees not counted)
2 Isolation Valves
1 Y Strainer having a Cv of 30.
Note: Unions, Secondary Connection Tees, and factory supplied fittings are ignored.
Calculate total equivalent length from Table 9.4:
20 ft Straight Pipe + 3 Elbows x 2.8 + 2 Turn in Tee x 5.5 + 2 Valves x 0.6 + 1 Y Strainer x 7.0 = 40.6 Equivalent Feet
Since the total equivalent length is less than 60 ft, flow through boiler loop meets requirements in Table 9.1
3) Indirect Water Heater Loop Piping – If an indirect water heater is used, install it as shown in Figure 9.3a or 9.3b. Refer to
the indirect water heater installation manual for the proper sizing the indirect water heater loop pump and piping.
4) Hydraulic Separators – Hydraulic separators serve the same purpose as the closely spaced tees connecting the boiler and
system loops in Figure 9.2. They also generally provide effective connection points for automatic air elimination devices
and an expansion tank. These separators are available from several sources and may be used in place of the closely spaced
tees shown in Figure 9.2, 9.3a or 9.3b. When a hydraulic separator is used in place of the tees, the 60 ft equivalent length
limitation still applies. Select a hydraulic separator having 1” or larger boiler connections that is designed for the boiler flow
rates shown in Table 9.1.
Table 9.4: Equivalent Lengths for Selected Valves and Fittings
(May Be Used for Copper or Threaded Fittings)
Fitting
Pipe Size
Equivalent Length (ft)
90° Elbow
1”
2.8
45° Elbow
1”
1.4
90° Turn in Tee
1”
5.5
Run of Tee
1”
1.8
Gate Valve (Open)
1”
0.7
Full Port Ball Valve
1”
0.7
Y-Strainer*
1”
7.0
* Based on Cv of 20. Pressure drop through strainers varies widely. 7 ft equivalent length
may be assumed for strainers having a published Cv greater than 20.
Table 9.5a: Flow Available with Boiler Loop
Equivalent Length of 30 ft or Less *
Table 9.5b: Flow Available with Boiler Loop
Equivalent Length of 60 ft or Less *
Boiler Model
Approx. Flow
(GPM)
Approx. Rise (°F)
Boiler Model
Approx. Flow
(GPM)
Approx. Rise
(°F)
K2WT-080
7.5
19
K2WT-080
7.3
20
K2WT-100
8.3
22
K2WT-100
8.0
23
K2WT-120
9.6
22
K2WT-120
9.2
24
K2WT-150
12.9
21
K2WT-150
11.9
23
K2WT-180
12.9
25
K2WT-180
11.9
27
*
For multi-speed pumps, these tables assume pump is set to highest speed.
IX. System Piping
(continued)
Summary of Contents for K2WT
Page 82: ...82 107110 01 6 16 Figure 10 4 Proper Installation of Header Sensor X Wiring continued ...
Page 83: ...83 107110 01 6 16 X Wiring continued Figure 10 5 Internal Ladder Diagram ...
Page 84: ...84 107110 01 6 16 X Wiring continued ...
Page 85: ...85 107110 01 6 16 Figure 10 6 Internal Wiring Connections Diagram X Wiring continued ...
Page 95: ...95 107110 01 6 16 Lighting and Operating Instructions XI Start Up and Checkout continued ...
Page 140: ...140 107110 01 6 16 XV Repair Parts continued ...
Page 142: ...142 107110 01 6 16 XV Repair Parts continued ...
Page 146: ...146 107110 01 6 16 XV Repair Parts continued ...
Page 148: ...148 107110 01 6 16 XV Repair Parts continued ...
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