Rinnai 37AHB SERIES - Manual (Page 57)

Rinnai Corporation Hydronic Furnace (37AHB) Manual 57
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
17
00
166
6
1635
1604
1576
1543
1
518
14
92
146
5
1430
1402
120
50.
1
49.
1
48
.1
47
.2
46.
4
45.
4
44.
7
43.
9
43.
1
42
.1
41
.3
130
59.
7
58.
5
57
.4
56
.3
55.
3
54.
2
53.
3
52.
4
51.
4
50
.2
49
.2
140
68.
8
67.
4
66
.2
64
.9
63.
8
62.
5
61.
4
60.
4
59.
3
57
.9
56
.8
150
79.
9
78.
3
76
.9
75
.4
74.
1
72.
5
71.
4
70.
1
68.
9
67
.2
65
.9
160
89.
5
87.
7
86
.1
84
.5
83
81.
2
79.
9
78.
6
77.
1
75
.3
73
.8
15
61
152
4
1490
1456
1428
1396
1
364
13
30
123
0
1265
1224
120
50.
9
49.
7
48
.6
47
.5
46.
6
45.
6
44.
5
43.
4
40.
1
41
.3
39
.9
130
60.
6
59.
2
57
.8
56
.5
55.
4
54.
2
53.
0
51.
6
47.
7
49
.1
47
.5
140
68.
3
66.
7
65
.2
63
.7
62.
5
61.
1
59.
7
58.
2
53.
8
55
.4
53
.6
150
79.
3
77.
4
75
.7
73
.9
72.
5
70.
9
69.
3
67.
5
62.
5
64
.2
62
.2
160
89.
8
87.
7
85
.8
83
.8
82.
2
80.
3
78.
5
76.
5
70.
8
72
.8
70
.4
13
91
135
0
1320
1281
1245
1209
1
170
11
31
109
0
1064
1031
120
51.
5
50.
0
48
.9
47
.4
46.
1
44.
7
43.
3
41.
9
40.
3
39
.4
38
.2
130
60.
6
58.
8
57
.5
55
.8
54.
2
52.
6
50.
9
49.
2
47.
5
46
.3
44
.9
140
71.
7
69.
6
68
.0
66
.0
64.
1
62.
3
60.
3
58.
3
56.
2
54
.8
53
.1
150
81.
0
78.
6
76
.9
74
.6
72.
5
70.
4
68.
1
65.
9
63.
5
61
.9
60
.0
160
91.
2
88.
5
86
.6
84
.0
81.
6
79.
3
76.
7
74.
2
71.
5
69
.8
67
.6
12
22
117
4
1140
1100
1063
1014
979
937
887
829
777
120
47.
3
45.
4
44
.1
42
.5
41.
1
39.
2
37.
9
36.
2
34.
3
32
.1
30
.0
130
53.
2
51.
1
49
.6
47
.8
46.
2
44.
1
42.
6
40.
8
38.
6
36
.1
33
.8
140
64.
3
61.
7
60
.0
57
.8
55.
9
53.
3
51.
5
49.
3
46.
6
43
.6
40
.9
150
73.
4
70.
5
68
.5
66
.1
63.
8
60.
9
58.
8
56.
3
53.
3
49
.8
46
.7
160
81.
8
78.
6
76
.3
73
.6
71.
1
67.
9
65.
5
62.
7
59.
4
55
.5
52
.0
37AHB 07514K A5 + R EU -V A3237 FF U(W)-U S/A SM E
A
H
B7
5
+
R9
8
L
S
i(
e
)/
A
S
M
E
T
A
B
L
E 5
.2
5
: 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)
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
.
A
IRFLOW
(
C
FM
)
TA
P
1
(H
)
4.
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
B7
5
+
R9
8
L
S
i(
e
)/
A
S
M
E
A
IRFLOW
(
C
FM
)
TA
P
2
(M
H
)
3.
5
NE
T
HE
A
TI
N
G
CAP
A
CI
TY
(M
B
H
)
27
32
40
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
TB
D
S
ee N
ot
e 6.
TB
D
See
N
ot
e 6.
A
H
B7
5
+
R9
8
L
S
i(
e
)/
A
S
M
E
A
IRFLOW
(
C
FM
)
TA
P
3
(M
L)
3.
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
TB
D
S
ee N
ot
e 6.
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
TB
D
S
ee N
ot
e 6.
TB
D
See
N
ot
e 6.
TB
D
S
ee N
ot
e 6.
NE
T
HE
A
TI
N
G
CAP
A
CI
TY
(M
B
H
)
2.
5
TA
P
4
(L
)
A
IRFLOW
(
C
FM
)
A
H
B7
5
+
R9
8
L
S
i(
e
)/
A
S
M
E
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
.
O
pt
im
al
Legs
@
50
C
F
M
/L
eg
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.