SECTION 1
8
: G
AS
P
IPING
77 of 198
SECTION 1
8
: GAS PIPING
1
8
.1 Gas Manifolds
All gas piping to the air handler m
u
st comply
w
ith:
United States: Refer to NFPA 54/ANSI Z223.1 - latest
re
v
ision, National F
u
el Gas Code.
Canada: Refer to CSA B149.1 - latest re
v
ision,
Nat
u
ral Gas and Propane Installation Code.
The air handlers are a
v
aila
b
le
w
ith three different
types of gas manifolds:
• American National Standards Instit
u
te (ANSI)
compliant manifold: (
See Page 78, Figure 62
through Page 79, Figure 63
.)
• Factory M
u
t
u
al (FM)-compliant manifold: (
See
Page 79, Figure 64
through Page 80, Figure 65
.)
• XL Ins
u
rance (former IRI)-compliant manifold: (8
through Page 81, Figure 68
.)
1
8
.2 Gas Pipin
g
and Pressures
The air handler is eq
u
ipped
w
ith a gas manifold
s
u
ita
b
le for connection to s
u
pply press
u
re of
u
p to:
• 28 in
w
c or 1 psi. maxim
u
m for the less than 1
million BTU capacity gas train.
See Page 78,
Figure 62
.
• 5 psi maxim
u
m for 1 million BTU and o
v
er
capacity gas trains.
See Page 79, Figure 63
through Page 81, Figure 68
.
When gas s
u
pply exceeds the a
b
o
v
e-listed maxim
u
m
gas press
u
res, an additional high press
u
re gas
reg
u
lator
w
ill
b
e req
u
ired to ass
u
re that the correct
gas press
u
re is s
u
pplied to the gas train. Press
u
re
sho
u
ld
b
e meas
u
red
b
et
w
een the high press
u
re gas
reg
u
lator and safety sh
u
t off
v
al
v
e. Minim
u
m gas
press
u
re as indicated on data plate m
u
st
b
e mea-
s
u
red
w
ith the
bu
rner operating in high fire.
Table 34: Gas Train Capacities
MBH
Manifold Size
Inlet Gas Pressure
Minimum
Maximum
Up to 999
1"
7"
w
c
1 PSI
1000 - 1650
1.25"
5 PSI
1"
12"
w
c
1651 - 2499
1.5"
7"
w
c
1.25"
12"
w
c
2500 - 3000
2"
7"
w
c
1.5"
12"
w
c
3001 - 4000
2.5" 8"
w
c
2"
12"
w
c
4001 - 5000
3"
8"
w
c
2.5"
12"
w
c
2"
21"
w
c
5001 - 6000
3"
12"
w
c
2.5"
21"
w
c
6001 - 8000
3"
12"
w
c
8001 - 9000
3"
21"
w
c
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