Rinnai 37AHB SERIES - Manual (Page 58)

58 Rinnai Corporation Hydronic Furnace (37AHB) Manual
N
O
T
E
S
:
1.
E
W
T
- En
teri
ng
W
ater Tempe
ratur
e (F)
.
2.
CFM - Air
flow
in (C
ubic Feet per
Minute).
3.
Legs - 3
in
ch
diame
ter
flex
ible du
cts to
diffu
ser
s.
4.
1 MBH =
1000
BTU/H.
5.
Shaded b
ox
represents ra
ting
poin
t; re
fer
to
w
iring diagra
m
for
factory
se
t sp
eed
taps.
6.
Number of 3”
diam
eter
leg
s
spe
cifi
ed i
n ta
ble a
bov
e is
fo
r
rating
poin
t o
nly
(i.e
. a
t Ex
ternal S
ta
tic
Pres
sure
of
0
.5
in. w
c. and
speed
TAP3, TAP1, TAP2
, TAP2
for
AHB45
, AH
B60, AHB75, A
H
B90 re
spe
ctiv
ely
). Final
leg
count i
s
to b
e de
termined
b
y the in
stalli
ng
con
tractor
and i
s to
be
based
on
the
follow
ing formula:
NUMBER OF LEG
S
= TOTAL
AVA
IL
ABLE CFM
(A
T THE S
P
ECI
F
IC
E
S
P)
/ DESI
RED CFM per LEG
(40, 50, or 60 CF
M)
Ex
ample: Giv
en the
design
point
for
A
H
B045 o
f 0
.8
ESP
, Low
fan
speed
(Ta
p5). From
tabl
e 5
.0
, av
ailable CFM i
s
569 and
the d
esir
ed CFM per
leg
is 50
CFM.
Therefore,
Number of Leg
s =
569/50
= 11
.38
rou
nded dow
n to
11
.
0
0
.1
0.
2
0
.3
0.
4
0
.5
0.
6
0
.7
0.
8
0
.9
1.
0
19
34
188
9
1857
1818
1784
1750
1
715
16
80
156
8
1491
1377
120
60.
2
58.
8
57
.8
56
.6
55.
5
54.
5
53.
4
52.
3
48.
8
46
.4
42
.9
130
67.
6
66
64
.9
63
.6
62.
4
61.
2
60.
0
58.
7
54.
8
52
.1
48
.1
140
77.
8
76
74
.7
73
.2
71.
8
70.
4
69.
0
67.
6
63.
1
60
.0
55
.4
150
89.
4
87.
3
85
.8
84
82.
5
80.
9
79.
3
77.
6
72.
5
68
.9
63
.6
160
101
99
97
.3
95
.3
93.
5
91.
7
89.
9
88.
1
82.
2
78
.1
72
.2
17
77
173
2
1694
1650
1630
1592
1
553
15
17
146
4
1441
1361
120
52.
9
51.
5
50
.4
49
.1
48.
5
47.
4
46.
2
45.
1
43.
6
42
.9
40
.5
130
64.
4
62.
8
61
.4
59
.8
59.
1
57.
7
56.
3
55.
0
53.
1
52
.2
49
.3
140
76.
0
74.
1
72
.5
70
.6
69.
7
68.
1
66.
4
64.
9
62.
6
61
.6
58
.2
150
89.
6
87.
3
85
.4
83
.2
82.
1
80.
2
78.
3
76.
5
73.
8
72
.6
68
.6
160
10
0.
9
98.
3
96
.2
93
.7
92.
5
90.
4
88.
2
86.
1
83.
1
81
.8
77
.3
15
73
153
0
1490
1448
1417
1372
1
327
12
93
125
3
1221
1175
120
52.
1
50.
7
49
.4
48
.0
47.
0
45.
5
44.
0
42.
9
41.
5
40
.5
39
.0
130
61.
8
60.
1
58
.5
56
.9
55.
7
53.
9
52.
1
50.
8
49.
2
48
.0
46
.1
140
71.
8
69.
8
68
.0
66
.1
64.
6
62.
6
60.
5
59.
0
57.
2
55
.7
53
.6
150
81.
8
79.
6
77
.5
75
.3
73.
7
71.
3
69.
0
67.
2
65.
2
63
.5
61
.1
160
91.
7
89.
2
86
.9
84
.4
82.
6
80.
0
77.
4
75.
4
73.
0
71
.2
68
.5
14
00
135
1
1317
1275
1225
1183
1
134
10
95
105
3
1011
951
120
50.
4
48.
6
47
.4
45
.9
44.
1
42.
5
40.
8
39.
4
37.
9
36
.4
34
.2
130
59.
9
57.
8
56
.4
54
.6
52.
4
50.
6
48.
5
46.
9
45.
1
43
.3
40
.7
140
68.
8
66.
4
64
.7
62
.6
60.
2
58.
1
55.
7
53.
8
51.
7
49
.7
46
.7
150
78.
3
75.
6
73
.7
71
.3
68.
5
66.
2
63.
4
61.
2
58.
9
56
.6
53
.2
160
88.
2
85.
1
82
.9
80
.3
77.
1
74.
5
71.
4
68.
9
66.
3
63
.7
59
.9
NO
M
INA
L
HEA
T
IN
G
CA
P
A
CI
TY
Ex
te
rn
a
l
St
a
ti
c
Pr
es
sur
e
(
E
S
P
) i
n
. W
.C
.
35
44
37AHB 09016K A5 + R EU -V A3237 FF U(W)-U S/A SM E
A
H
B9
0
+
R9
8
L
S
i(
e
)/
A
S
M
E
A
IRFLOW
(
C
FM
)
TA
P
1
(H
)
5.
0
NE
T
HE
A
TI
N
G
CAP
A
CI
TY
(M
B
H
)
M
ini
m
um
Legs
@
60 C
F
M
/Leg
A
H
B9
0
+
R9
8
L
S
i(
e
)/
A
S
M
E
A
IRFLOW
(
C
FM
)
TA
P
2
(M
H
)
4.
0
NE
T
HE
A
TI
N
G
CAP
A
CI
TY
(M
B
H
)
29
TB
D
See
N
ot
e 6.
A
IRFLOW
(
C
FM
)
TA
P
4
(L
)
3.
0
NE
T
HE
A
TI
N
G
CAP
A
CI
TY
(M
B
H
)
TB
D
S
ee N
ot
e 6.
A
H
B9
0
+
R9
8
L
S
i(
e
)/
A
S
M
E
A
IRFLOW
(
C
FM
)
TA
P
3
(M
L)
3.
5
NE
T
HE
A
TI
N
G
CAP
A
CI
TY
(M
B
H
)
TB
D
S
ee N
ot
e 6.
TB
D
See
N
ot
e 6.
TB
D
S
ee N
ot
e 6.
A
H
B9
0
+
R9
8
L
S
i(
e
)/
A
S
M
E
TB
D
S
ee N
ot
e 6.
M
ax
im
um
Legs @
40 C
F
M
/Leg
TB
D
S
ee N
ot
e 6.
TB
D
See
N
ot
e 6.
TB
D
S
ee N
ot
e 6.
N
um
ber
of
3"
di
am
et
er
br
an
ch
le
gs
appl
ic
abl
e t
o
H
ig
h
V
el
oc
ity
S
yst
em
s on
ly
.
U
ded o
nl
y i
f
m
et
hods ot
her
th
an
Tabl
e
3 i
s used t
o
det
er
m
ine du
ct
s
izes
.
T
A
B
L
E 5
.2
6
: A
IR
D
E
L
IVER
Y A
N
D
PE
R
F
O
R
M
A
N
C
E D
A
T
A
(
B
O
T
T
O
M
O
R
S
ID
E
R
E
T
U
R
N
w
/ F
A
C
T
O
R
Y
SU
PPL
IE
D
F
IL
T
ER
)
UNI
T
SI
Z
E
EC
M
S
PEE
D
TA
P
SUP
P
ORT
S
C
OOL
IN
G C
A
P
.
RA
NG
E (
T
O
N
S)
EW
T
(
O
F)
O
pt
im
al
Legs
@
50
C
F
M
/L
eg
M
ax
im
um
Legs @
40 C
F
M
/Leg
M
ini
m
um
Legs
@
60 C
F
M
/Leg
O
pt
im
al
Legs
@
50
C
F
M
/L
eg
M
ax
im
um
Legs @
40 C
F
M
/Leg
M
ini
m
um
Legs
@
60 C
F
M
/Leg
O
pt
im
al
Legs
@
50
C
F
M
/L
eg
M
ax
im
um
Legs @
40 C
F
M
/Leg
M
ini
m
um
Legs
@
60 C
F
M
/Leg
O
pt
im
al
Legs
@
50
C
F
M
/L
eg