SECTION 11: G
AS
P
IPING
F
OR
G
AS
-F
IRED
A
IR
T
URNOVER
U
NITS
37 of 143
SECTION 11: GAS PIPING FOR GAS-FIRED AIR TURNOVER UNITS
11.1 Gas Manifolds
All gas piping to the air t
u
rno
v
er
u
nit 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 for nat
u
ral gas and
LPG
u
nits. Refer to NFPA Article 31 - latest re
v
ision,
Standard for the Installation of Oil-B
u
rning
Eq
u
ipment for oil
u
nits.
Canada: Refer to CSA B149.1 - latest re
v
ision,
Nat
u
ral Gas and Propane Installation Code for
nat
u
ral gas and LPG
u
nits. Refer to CSA B139 -
latest re
v
ision, Installation Code for Oil-B
u
rning
Eq
u
ipment for oil
u
nits.
The air t
u
rno
v
er
u
nits are a
v
aila
b
le
w
ith t
w
o different
types of manifolds:
• Factory M
u
t
u
al (FM)/Under
w
riters
La
b
oratories (UL) Compliant
• XL Ins
u
rance (former Ind
u
strial Risk
Ins
u
rers[IRI]) Compliant
11.2 Gas Pipin
g
and Pressures
The air t
u
rno
v
er
u
nit 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 1
PSIG (68.9 m
b
ar). When gas s
u
pply exceeds this
maxim
u
m gas press
u
re, an additional high press
u
re
gas reg
u
lator
w
ill
b
e req
u
ired to ins
u
re that the
correct gas press
u
re is s
u
pplied to the reg
u
lator.
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.
For minim
u
m inlet gas press
u
res refer to
.
WARNING
Explosion Hazard
Leak test all components of gas/oil piping
before operation.
Gas/oil can leak if piping is not installed
properly.
Do not high pressure test gas/oil piping with
air handler connected.
Failure to follow these instructions can result
in death, injury or property damage.
