Rinnai 37AHB SERIES - Manual (Page 33)

Rinnai Corporation Hydronic Furnace (37AHB) Manual 33
0
0
.1
0.
2
0
.3
0.
4
0
.5
0.
6
0
.7
0.
8
0
.9
1.
0
948
921
891
868
841
819
795
772
7
0
1
596
56
7
120
31.
4
30.
5
29.
5
28.
7
27.
8
27.
1
26.
3
25.
6
23.
2
19.
7
18.
8
130
37.
4
36.
3
35.
2
34.
3
33.
2
32.
3
31.
4
30.
5
27.
7
23.
5
22.
4
140
46.
0
44.
7
43.
2
42.
1
40.
8
39.
7
38.
6
37.
4
34.
0
28.
9
27.
5
150
52.
3
50.
8
49.
1
47.
9
46.
4
45.
2
43.
9
42.
6
38.
7
32.
9
31.
3
160
59.
3
57.
6
55.
7
54.
3
52.
6
51.
2
49.
7
48.
3
43.
8
37.
3
35.
5
921
891
864
836
812
788
768
742
6
9
9
594
55
9
120
31.
8
30.
8
29.
9
28.
9
28.
1
27.
2
26.
5
25.
6
24.
2
20.
5
19.
3
130
37.
2
36.
0
34.
9
33.
8
32.
8
31.
8
31.
0
30.
0
28.
2
24.
0
22.
6
140
45.
8
44.
3
42.
9
41.
6
40.
4
39.
2
38.
2
36.
9
34.
7
29.
5
27.
8
150
52.
1
50.
4
48.
9
47.
3
45.
9
44.
6
43.
4
42.
0
39.
5
33.
6
31.
6
160
58.
7
56.
7
55.
0
53.
2
51.
7
50.
2
48.
9
47.
3
44.
5
37.
8
35.
6
803
768
740
712
682
652
628
596
5
6
9
541
51
0
120
31.
2
29.
8
28.
7
27.
7
26.
5
25.
3
24.
4
23.
2
22.
1
21.
0
19.
8
130
35.
3
33.
8
32.
6
31.
3
30.
0
28.
7
27.
6
26.
2
25.
0
23.
8
22.
5
140
41.
1
39.
3
37.
8
36.
4
34.
9
33.
3
32.
1
30.
5
29.
1
27.
7
26.
1
150
49.
0
46.
8
45.
1
43.
4
41.
6
39.
7
38.
3
36.
3
34.
7
33.
0
31.
1
160
55.
0
52.
6
50.
7
48.
7
46.
7
44.
6
43.
0
40.
8
38.
9
37.
0
34.
9
20
13
16
20
M
in
im
um
Legs
@
60 C
F
M
/Leg
O
pt
im
al
L
egs
@
50 C
F
M
/Leg
Ma
xi
m
um le
gs
@
40 C
F
M
/Leg
A
H
B
4
5 +
R
C
80H
P
i(
e
)
A
H
B
4
5 +
R
C
80H
P
i(
e
)
A
H
B
4
5 +
R
C
80H
P
i(
e
)
13
16
TAP
5
(L
)
1.
5
N
E
T
H
EAT
IN
G
C
A
PAC
IT
Y
(M
B
H
)
AI
RF
L
O
W
(CF
M
)
TAP
4
(M
)
M
in
im
um
Legs
@
60 C
F
M
/Leg
O
pt
im
al
L
egs
@
50 C
F
M
/Leg
Ma
xi
m
um le
gs
@
40 C
F
M
/Leg
16
20
T
A
B
L
E
5
.1
: AI
R D
E
L
IV
E
RY
AN
D
P
E
RF
O
R
M
ANC
E
D
A
T
A
(
B
O
T
T
O
M
O
R
S
ID
E
RE
T
URN
w
/ F
A
C
T
O
R
Y
S
U
P
P
L
IE
D
F
IL
T
E
R
)
UN
IT
SIZ
E
EC
M
SPE
E
D
TA
P
37 AH B0450 8KA 5 + RE U-K A2530FFU D(W D)- US
TAP
3
(H)
AI
RF
L
O
W
(CF
M
)
N
E
T
H
EAT
IN
G
C
A
PAC
IT
Y
(M
B
H
)
2.
0
N
E
T
H
EAT
IN
G
C
A
PAC
IT
Y
(M
B
H
)
2.
0
13
SU
PP
O
R
T
S
CO
O
L
IN
G
CAP
.
RANG
E
(T
O
N
S
)
E
W
T (
O
F)
AI
RF
L
O
W
(CF
M
)
NO
M
INAL
HE
AT
IN
G
CA
P
ACI
T
Y
E
x
te
rn
a
l St
a
tic
Pr
e
ss
u
re
(
E
SP)
N
um
ber
of
3"
Di
am
et
er
B
ranc
h Legs
appl
ic
ab
le
t
o H
ig
h
V
el
oc
ity
S
ys
tem
s O
nl
y.
U
sed onl
y i
f m
et
hods
ot
her
than T
abl
e 3 i
s us
ed t
o det
er
m
ine duc
t s
iz
es
.
M
in
im
um
Legs
@
60 C
F
M
/Leg
O
pt
im
al
L
egs
@
50 C
F
M
/Leg
Ma
xi
m
um le
gs
@
40 C
F
M
/Leg
N
O
T
E
S
:
1.
EWT - Entering
Water Temp
erat
ure (
F
).
2.
CFM - Airflo
w
in
(Cubic Feet pe
r
Minute).
3.
Legs - 3 inch diameter flexible du
cts to diffusers.
4.
1 MBH = 1000 B
T
U/H.
5.
Shaded bo
x rep
resents rating point; refer
to
w
iring
diagram for f
actor
y set speed t
aps.
6.
Number of
3” dia
m
eter legs specified
in table above is for rating poi
nt onl
y (i.e. at
E
xternal Static Pressure of 0.5 in.
w
c. and
speed TAP3, TA
P1, TAP2 , TAP2
for AHB45, AHB
60, AHB75, AHB
90 respectively).
Final leg
count is to be determin
ed b
y
the installing con
tractor and is to
be based on the
follow
ing form
ula:
NUMBER
O
F
LE
G
S
= TO
TAL AV
AILABLE CFM
(A
T
T
H
E SPE
CIFIC ES
P)
/ DESIRED CF
M
per LE
G
(40, 50,
or 6
0 C
F
M
)
Example:
Given the design point for AH
B045 of
0.8
ESP, Lo
w
fan sp
eed (Ta
p5).
Fro
m
table 5.0, available CFM is 569
and
the desired CF
M
per leg is 50 CF
M.
Therefo
re, N
umb
er of Legs = 569/
50 = 11.38 ro
und
ed do
w
n to
11.
TBD
See Note 6.
TBD
See Note 6.
TBD
See Note 6.
TBD
See Note 6.
TBD
See Note 6.
TBD
See Note 6.
in. W.C.