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2. Technical Gas Data
* Measured at gas valve pressure tap when ignition has occurred. Measured in inches of water column (W.C.). The manifold
pressure for natural gas is 3.5 inches (8.7 mb) water column. The manifold pressure for liquid propane (L.P.) is 10.5 inches
(26.1 mb) water column.
Drill manufacturer’s standard-equivalent (D.M.S.) to standard twist drill or steel wire gauge numbers.
Water column in inches.
3. Piping/Connections
The dryer is provided with one (1) common 3/4” N.P.T. inlet pipe connection, which branches into two (2)
1/2-inch pipes, which feed the gas valves. It is recommended that a gas shutoff valve servicing each dryer
be provided.
The size of the gas supply line (header) will vary depending on the distance this supply line travels from the
gas meter or, in the case of L.P. gas, the supply tank, the amount of tees, other gas-operated appliances, 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 gas 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 3/4-inch (19.05 mm)
pipe gas loop be installed in the supply line servicing the bank of dryers. An in-line pressure regulator must
be installed in the gas supply line (header) if the (natural) gas line pressure exceeds 12.0 inches (29.9 mb)
water column pressure.
IMPORTANT: For natural gas, a water column pressure of 4.0 inches (9.9 mb), as measured at
the gas valve pressure tap, is required at each dryer for proper and safe
operation. The 4.0 inch (9.9 mb) pressure should be obtained when the gas
valve is firing in its high-fire stage. Pressure of 4.0 inches (9.9 mb) at the gas
valve tap will result in a 3-1/2” manifold pressure.
A 1/8” N.P.T. plugged tapping, accessible for test gauge connection, must be installed in the main gas
supply line immediately upstream of the dryer.
IMPORTANT: Pipe joint compounds that resist the action of natural and L.P. gases must be used.
TECHNICAL GAS DATA
Type of Gas:
ADG-230DH ADG-215DH
Natural Propane Butane Natural Propane Butane
Gas Valve Pressure* 4” 11” 11” 4” 11” 11”
In-Line Pressure (W.C.) 6” - 12” 11” 11” 6” - 12” 11” 11”
Orifice Size (D.M.S.) 18 41 42 30 48 49
Gas Inlet Size 3/4” N.P.T.
BTUH Input (Each basket [tumbler]) 72,000 50,000
Total BTUH Input (per dryer) 144,000 100,000