22 American Dryer Corp. 113403-17
Piping / Connections
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!!!
SL20 SL31 SL50 SL75
3/8” 1/2” 1/2” 1/2”
TYPICAL L.P. GAS INSTALLATION
Heat Input / Gas Consumption / Orifice (Injector) Data (For AGA [Australian] Models Only)*
Gas Specifications for AGA Approved Dryers (Australia)
Model
Gas
Type
Supply
Pressure
Gross
Heat Input
Orifice Size
Orifice
(Injector)
Quantity
Burner
Pressure
kPa MJ/h DMS mm kPa
SL20
Natural
1.7-3.2 42.20
30
3.264
1
0.67
Propane
2.75 42.20
49
1.854
1
2.30
SL31
Natural
1.7-3.2 58.03
22
3.988
1
0.69
Propane
2.75 58.03
44
2.184
1
2.49
SL50
Natural
1.7-3.2 94.96
29
3.454
2
0.72
Propane
2.75 94.96
47
1.994
2
2.49
SL75
Natural
1.7-3.2 116.06
22
3.988
2
0.69
Propane
2.75 116.06
44
2.184
2
2.49
Shaded areas are stated in metric equivalents
* Consult factory for elevations over 2,000 feet (610 meters) for correct orifice size.
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