ADC AD-120ES Installation Manual page 20

AD-120ES Gas Connections
Inlet connection ........... 1" N.P.T.
(1" B.S.P.T. for CE and AGA dryers)
Gas Pipe supply size ... 1-1/4" Diameter Pipe (minimum)
Heat input .................... 375,000 Btu/hr (94,500 kcal/hr)
ADG-120DR Gas Connections
Inlet connection ........... 3/4" M.N.P.T.
Gas Pipe supply size ... 1" Diameter Pipe (minimum)
Heat input .................... 300,000 Btu/hr (75,649 kcal/hr)
Natural Gas
Regulation is controlled by the dryer's gas valve's internal
regulator. Incoming supply pressure must be consistent
between a minimum of 7.0 in WC (17.4 mb, 1.74 kPa) and a
maximum of 13.0 in WC (32.4 mb, 3.24 kPa) pressure. Burner
manifold pressure should be 3.5 in WC (8.7 mbar, 0.87 kPa);
adjust if necessary.
L.P. Gas (Unregulated)
Dryers made for use with unregulated 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 in WC (26.1 mb, 2.61 kPa). 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.
L.P. Gas (Regulated)
Regulation is controlled by the dryer's gas valve's internal
regulator. Incoming supply pressure must be consistent at
11.0 in WC (27 mbar, 2.7 kPa). Burner manifold pressure
should be 8.8 in WC (22 mbar, 2.2 kPa); adjust if necessary.
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 (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 Btu being supplied.
The dryer is provided with a 1" N.P.T. (1" B.S.P.T. for CE and
AGA dryers) inlet pipe connection extending out the back
area of the burner box. The minimum pipe size connection
(supply line) to the dryer is 1-1/4" diameter. For ease of
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 supply 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.
20
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 13.0 in
WC (32.4 mb, 3.24 kPa) pressure.
IMPORTANT: A water column pressure of 3.5 in WC (8.7
mb, 0.87 kPa) for natural gas and 10.5 in WC (26.1 mb, 2.61
kPa) for unregulated L.P. dryers, and 8.8 in WC (22 mb, 2.2
kPa) for regulated L.P. dryers is required at the gas valve
pressure tap of each dryer for proper and safe operation.
An 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 and L.P. gases must be used.
Test all connections for leaks by brushing on a soapy water
solution (liquid detergent works well).
Never test for leaks with a flame!!!
IMPORTANT: The dryer and its individual shutoff valve must
be disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in excess
of 1/2 psig (3.5 kPa).
NOTE: The dryer must be isolated from the gas supply piping
system by closing its individual manual shutoff valve during
any pressure testing of the gas supply piping system at test
pressures equal to or less than 1/2 psig (3.5 kPa).
American Dryer Corp.
WARNING
!
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