113374 - 4
Telephone 01422 822282
19
2) Liquid Propane (L.P.) Gas
Dryers made for use with L.P. gas have the gas valve’s internal pressure regulator blocked open so that the
gas pressure
must be
regulated upstream of the dryer. The pressure measured at each gas valve pressure
tap
must be
a consistent 10.5 inches (26.1 mb) water column. There is no regulator or regulation provided
in an L.P. dryer. The water column pressure
must be
regulated at the source (L.P. tank) or an external
regulator
must be
added to each dryer.
Shaded area is stated in metric equivalent
* Drill Measurement Size (D.M.S.) equivalents are as follows:
Natural Gas ....................... #7 = 0.2010” (5.334 mm).
Liquid Propane Gas ........... #31 = 0.1200” (3.048 mm).
3. Piping/Connections
ALL
components/materials
must conform
to National Fuel Gas Code Specifications ANSI Z223.1-LATEST
EDITION, or in Canada, CAN/CGA-B149.1-M91 (Natural Gas) or CAN/CGA-B149.2-M91 (Liquid Propane [L.P.]
Gas) or LATEST EDITION (for General Installation and Gas Plumbing), as well as local codes and ordinances and
must be
done by a qualified professional. It is important that gas pressure regulators meet applicable pressure
requirements, and that gas meters be rated for the total amount of
ALL
the appliance Btus being supplied.
The dryer is provided with a 1” N.P.T. inlet pipe connection extending out the back area of the burner box. The
minimum pipe size (supply line) to the dryer is 1” diameter. For ease in servicing, the gas supply line of each dryer
must have its own shutoff valve.
The size of the main gas supply line (header) will vary depending on the distance this line travels from the gas meter
or, in the case of L.P. gas, the supply tank, other gas-operated appliances on the same line, etc. Specific information
regarding supply line size
should be
determined by the gas supplier.
NOTE:
Undersized gas supply piping can create a low or inconsistent pressure, which will result in erratic
operation of the burner ignition system.
Consistent gas pressure is essential at
ALL
gas connections. It is recommended that a 1-inch (2.54 cm) pipe gas
loop be installed in the supply line servicing a bank of dryers. An in-line pressure regulator
must be
installed in the
gas supply line (header) if the (natural) gas pressure exceeds 12.0 inches (29.9 mb) of water column (W.C.)
pressure.
NOTE:
A consistent water column test pressure of 3.5 inches (8.7 mb) for natural gas and 10.5 inches (26.1
mb) for L.P. dryers is required at the gas valve pressure tap of each dryer for proper and safe
operation.
A 1/8” N.P.T. plugged tap, accessible for a test gauge connection,
must be
installed in the main gas supply line
immediately upstream of each dryer.
IMPORTANT:
Pipe joint compounds that resist the action of natural gas and L.P. gas
must be
used.
IMPORTANT:
Test
ALL
connections for leaks by brushing on a soapy water solution (liquid detergent works
well).
S
A
G
F
O
E
P
Y
T
d
i
u
q
i
L
e
n
a
p
o
r
P
t
i
K
n
o
i
s
r
e
v
n
o
C
r
e
b
m
u
N
t
r
a
P
r
h
/
u
t
B
g
n
i
t
a
R
r
h
/
l
a
c
k
g
n
i
t
a
R
l
a
r
u
t
a
N
e
n
a
p
o
r
P
d
i
u
q
i
L
.
y
t
Q
.
S
.
M
.
D
*
.
o
N
t
r
a
P
.
y
t
Q
.
S
.
M
.
D
*
.
o
N
t
r
a
P
0
0
0
,
0
5
3
0
0
2
,
8
8
3
7
#
2
6
8
0
4
1
3
1
3
#
8
1
8
0
4
1
9
0
3
3
8
8
Содержание D90
Страница 40: ...JLA113374 4 10 02 07 5 ...
