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Installation, Notice – Rinnai 37AHB SERIES User Manual

Page 12

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12

Rinnai Corporation Hydronic Furnace (37AHB) Manual

Fitting or Valve

3/8"

1/2"

3/4"

1"

1 1/4"

1 1/2"

2"

2 1/2"

3"

90 deg. Elbow

0.5

1

2

2.5

3

4

5.5

7

9

45

deg.

elbow

0.35

0.5

0.75 1 1.2 1.5 2 2.5 3.5

Straight thru tee

0.2

0.3

0.4

0.45

0.6 0.8 1 0.5 1

Side port tee

2.5

2

3

4.5

5.5

7

9

12

15

Reducer

coupling 0.2 0.4 0.5 0.6 0.8 1 1.3 1 1.5

Gate

valve

0.35 0.2 0.25 0.3 0.4 0.5 0.7 1 1.5

Globe

valve

8.5 15 20 25 36 46 56 104

130

Angle

valve

1.8 3.1 4.7 5.3 7.8 9.4 12.5 23 29

Ball

valve

1.8 1.9 2.2 4.3 7 6.6 14 0.5 1

Swing check valve

0.95

2

3

4.5

5.5

6.5

9

11

13

Flow check valve

NA

NA

83

54

74

57

177

85

98

Butterfly

valve

NA 1.1 2 2.7 2 2.7 4.5 10

15.5

Rinnai Flow Sensor

NA

NA

3.2 NA NA NA NA NA NA

Taco

49-075

Air

NA NA 0.3 NA NA NA NA NA NA

Table 2: Equivalent Length of Straight Pipe for Valves and Fittings (ft)

Rinnai Flow Sensor

ball valves

TACO Model 49-075

Air Separator

gauge

cap

3/4 in. type M copper tubing

4 ft

9 ft

15 ft

5 ft

10 ft

3 ft

3 ft

3 ft

3 ft

3 ft

3 ft

12 ft

10 ft

FS

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.

Installation

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.

NOTICE

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.

Figure 10

Equivalent Length Calculation