S
ERIES
2000 I
NSTALLATION
, O
PERATION
AND
S
ERVICE
M
ANUAL
42
15.4 Gas Pipin
g
The gas manifold extends thro
u
gh the side of the
control cabinet for models 2005 - 2030. The factory
piping terminates
w
ith a male pipe connection. A
u
nion m
u
st also be installed (s
u
pplied by others)
bet
w
een the man
u
al gas
v
al
v
e main and the first tee
pipe. Be s
u
re that the f
u
el s
u
pply pipe connected at
this point is large eno
u
gh to ens
u
re the proper gas
flo
w
and line press
u
re at the inlet of the air handler.
The piping 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.
Gas s
u
pply piping m
u
st conform to best b
u
ilding
practices and local codes. D
u
ring installation of the
gas piping, be s
u
re that no piping restricts
accessibility to the air handler or its remo
v
able
access doors.
Lockable man
u
al sh
u
t-off
v
al
v
e m
u
st be added by the
installer in compliance
w
ith Occ
u
pational Safety and
Health Administration (OSHA) reg
u
lations.
15.5 Pressure Test Ports
There are 1/8" (3.2 mm) and 1/4" (6.4 mm) press
u
re
test ports located on the manifold. The test ports are
a
v
ailable to meas
u
re the manifold inlet gas press
u
re
and the b
u
rner gas press
u
re d
u
ring b
u
rner set
u
p.
15.5.1 Manifold Inlet Gas Pressure
The press
u
re port for meas
u
ring manifold inlet
press
u
re is located on the inlet side of the first safety
sh
u
toff
v
al
v
e. Refer to the
u
nit rating plate for the
acceptable inlet gas press
u
re.
15.5.2 Burner Gas Pressure
A press
u
re tap is
u
sed to meas
u
re negati
v
e airflo
w
at
the b
u
rner and to set high fire gas press
u
re. On air
handlers eq
u
ipped
w
ith a M611 mod
u
lating
v
al
v
e, the
press
u
re tap is located on a tee bet
w
een the M611
v
al
v
e and the b
u
rner.
See Page 42, Figure 22
and
Page 71, Figure 36
. On air handlers eq
u
ipped
w
ith
the MR212 mod
u
lating
v
al
v
e, the press
u
re tap co
u
ld
be located on the do
w
nstream side of the MR212
v
al
v
e, on a T-fitting coming off the o
u
tlet press
u
re tap
on the MR212
v
al
v
e or bet
w
een the MR212
v
al
v
e
and the b
u
rner.
See Page 42, Figure 22
and
Page
70, Figure 34
.
FIGURE 22: Plu
g
Tappin
g
(2005 - 2030)
15.6 Line Pressure Test - Leak Testin
g
The air handler and its indi
v
id
u
al sh
u
t-off
v
al
v
e m
u
st
be disconnected from the gas s
u
pply piping systems
d
u
ring any press
u
re testing of that system at test
press
u
res in excess of 14 in
w
c (34.9 mbar). The air
handler m
u
st be isolated from the gas s
u
pply piping
system by closing its indi
v
id
u
al man
u
al gas
v
al
v
e that
is located immediately
u
pstream of the safety sh
u
t-off
gas
v
al
v
e.
Burner
Modulating Valve
Manual Gas
Valve (Burner)
Plugged Taping
