Rinnai 37AHB SERIES - Manual (Page 38)

38 Rinnai Corporation Hydronic Furnace (37AHB) Manual
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63.
2
A
H
B
9
0 +
R
C
98H
P
i(
e
)
AI
RF
L
O
W
(CF
M
)
TAP
4
(L
)
3.
0
N
E
T
H
EAT
IN
G
C
A
PAC
IT
Y
(M
B
H
)
27
M
in
im
um
Legs
@
60 C
F
M
/Leg
TAP
3
(M
L)
3.
5
N
E
T
H
EAT
IN
G
C
A
PAC
IT
Y
(M
B
H
)
27
32
40
27
32
40
A
H
B
9
0 +
R
C
98H
P
i(
e
)
AI
RF
L
O
W
(CF
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
5.
0
N
E
T
H
EAT
IN
G
C
A
PAC
IT
Y
(M
B
H
)
A
H
B
9
0 +
R
C
98H
P
i(
e
)
AI
RF
L
O
W
(CF
M
)
TAP
2
(M
H)
4.
0
N
E
T
H
EAT
IN
G
C
A
PAC
IT
Y
(M
B
H
)
T
A
B
L
E
5
.6
: 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
SU
PP
O
R
T
S
CO
O
L
IN
G
CAP
.
RANG
E
(T
O
N
S
)
E
W
T (
O
F)
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
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
27
32
40
O
pt
im
al
L
egs
@
50 C
F
M
/Leg
Ma
xi
m
um le
gs
@
40 C
F
M
/Leg
32
40
37A HB 09016K A5 + R EU -K A3237FFU D(W D)- US
A
H
B
9
0 +
R
C
98H
P
i(
e
)
AI
RF
L
O
W
(CF
M
)
TAP
1
(H)
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
PECI
F
IC
E
SP)
/ 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
.
TBD
See Note 6.
TBD
See Note 6.
TBD
See Note 6.
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.