ADC HBG76 - Manuel (Page 14)

14 American Dryer Corp. 113615 - 2
Piping/Connections
Inlet Connection – 1/2” M.N.P.T.
CE and Australian dryer connections will be B.S.P.T., all others
will be N.P.T.
There should be a minimum 6-inch (15.24 cm) clearance
between the back guard and the first bend in the gas piping
for ease of servicing. It is recommended that a gas shutoff
valve be provided to the gas supply line of each dryer for
ease in servicing.
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.
TYPICAL NATURAL GAS INSTALLATION
Consistent gas pressure is essential at all gas connections.
It is recommended that a 3/4-inch (19.05 mm) 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 (32.34 mb) pressure.
A plugged tap, accessible for a pressure gauge connection,
must be installed in the main gas supply line immediately
upstream of the dryers.
Important: Pipe joint compounds that resist the action of
natural, L.P., and butane gases must be used.
Test all connections for leaks by brushing on a soapy
water solution (liquid detergent works well).
Warning
Never test for leaks with a flame!!!
TYPICAL L.P. GAS INSTALLATION
!
Heat Input/Gas Consumption/Orifice (Injector) Data
Shaded areas are stated in metric equivalents
* Gas valve’s internal regulator disabled.
** Consult factory for elevations over 2,000 feet (610 meters) for correct orifice size.
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Gas Specifications for Non-CE and Non-AGA Approved Dryers **
Gas
Type
Nominal
Heating Value
Supply
Pressure
Gross
Heat Input
Orifice Size
Orifice
(Injector)
Quantity
Burner
Pressure
B tu /ft 3 in WC Btu/hr kW DMS mm in WC
Natural 1,000 7.0-13.0 130,000 38.103 23 3.9116 2 4.0
* Liquid Propane 2,500 11.0 130,000 38.103 42 2.3749 2 10.0