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Installation
PROCEDURE FOR CALCULATING THE TOTAL
EQUIVALENT LENGTH OF PIPE
Given piping assembly as shown in Figure 10 below,
what is the total equivalent length of the system?
First determine the total straight pipe lengths; next
refer to table 2 to determine the equivalent straight
pipe length for each fitting shown. Add together the
equivalent lengths of piping and fittings.
NOTICE
Where possible the length of pipe
should not exceed 150 feet total
equivalent length.
Any piping running through
unconditioned space MUST be
insulated to prevent heat loss,
and possible freezing of the line.
Stickers indicating direction of
flow, (WATER IN, and WATER
OUT) are labeled on the outside
of the cabinet. DO NOT reverse
these lines, as this will cause the
unit to malfunction.
Table 2: Equivalent Length of Straight Pipe for Valves and Fittings (ft)
Fitting or Valve
90 deg. Elbow
45 deg. elbow
Straight thru tee
Side port tee
Reducer coupling
Gate valve
Globe valve
Angle valve
Ball valve
Swing check valve
Flow check valve
Butterfly valve
Rinnai Flow Sensor
Taco 49-075 Air
12
Rinnai Flow Sensor
4 ft
12 ft
3 ft
Figure 10
3/8"
1/2"
3/4"
0.5
1
0.35
0.5
0.75
0.2
0.3
0.4
2.5
2
0.2
0.4
0.5
0.35
0.2
0.25
8.5
15
20
1.8
3.1
4.7
1.8
1.9
2.2
0.95
2
NA
NA
83
NA
1.1
NA
NA
3.2
NA
NA
0.3
Rinnai Corporation Hydronic Furnace (37AHB) Manual
¾" Tubing (total straight pipe length)....68 ft.
(6) ¾" 90 deg. Elbows............6(2) = 12 ft.
(2) ¾" Side port tee...............2(3) = 6.0 ft.
(1) ¾" Taco air separator....1(0.3) = 0.3 ft.
(1) ¾" Rinnai flow sensor.....1(3.2) = 3.2 ft.
(2) ¾" Ball valves................2(2.2) = 4.4 ft.
Total Equivalent length..............93.9 ft.
3/4 in. type M copper tubing
FS
9 ft
5 ft
ball valves
3 ft
3 ft
TACO Model 49-075
Equivalent Length Calculation
1"
1 1/4"
2
2.5
3
1
1.2
0.45
0.6
3
4.5
5.5
0.6
0.8
0.3
0.4
25
36
5.3
7.8
4.3
7
3
4.5
5.5
54
74
2
2.7
2
NA
NA
NA
NA
3 ft
10 ft
10 ft
3 ft
3 ft
cap
Air Separator
1 1/2"
2"
4
5.5
1.5
2
0.8
1
7
9
1
1.3
0.5
0.7
46
56
9.4
12.5
6.6
14
6.5
9
57
177
2.7
4.5
NA
NA
NA
NA
gauge
15 ft
2 1/2"
3"
7
9
2.5
3.5
0.5
1
12
15
1
1.5
1
1.5
104
130
23
29
0.5
1
11
13
85
98
10
15.5
NA
NA
NA
NA
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