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Natural Gas
If the pressure is too low, ignition failure and/or slow drying times may result. Excessively high
supply pressure will result in erratic operation of the gas valves internal pressure regulator. Further
information in section: Gas connection.
Propane Gas
Dryers made for use with propane gas have the gas valve pressure regulator blocked open, so
that the gas pressure must be regulated upstream of the dryer. In accordance with American Gas
Association (AGA) standards, a gas pressure regulator, when installed indoors, must be equipped
with a vent limiter or a vent line must be installed from the gas pressure regulator vent to the
outdoors. The water column pressure must be regulated at the source (propane tank), or an
external regulator must be added to each dryer. Further information in section: Gas connection.
Piping/Connections
The dryer is provided with a 1/2" N.P.T. inlet pipe connection extending out the rear area or
through the top of the dryer. For ease of servicing, the gas supply line of each dryer should have
its own shut-off valve.
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 propane gas, the supply tank, the number 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 pipe gas loop be installed in the supply line serving the bank of dryers. An in-line pressure
regulator must be installed in the gas supply line (header) if (natural) gas line pressure exceeds
12-inches water column pressure.
IMPORTANT:
The information regarding the settings of the water column pressure for Natural
gas dryers and Propane gas dryers is found in section: Gas connection. The
pressure 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 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 propane gas
MUST BE used.
WARNING:
Test ALL connections for leaks by brushing on a soapy water solution (liquid
detergent also works well). NEVER TEST FOR GAS LEAKS WITH AN OPEN
FLAME.
ALL components / materials must conform to NATIONAL FUEL GAS CODE specifications. It is
important that gas pressure regulators meet applicable pressure requirements and that gas meters
are rated for the total amount of appliance BTU's being supplied.
Safety
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