Installation manual
487 14 59 11 - TD30 TD50 TD75 US
12
Natural Gas
The natural gas supply pressure to the dryer must be between 6 and 10 inches water column. 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. The pressure
measured at the pressure tap on the body of the gas valve must be for TYPE 30: 4.2-inches water
column, TYPE 50: 3.2 -inches water column and TYPE 75: 3.2 -inches water column
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. The pressure measured at the gas valve
body pressure tap must be 11 inches water column. 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.
Piping/Connections
The dryer is provided with a
1
/
2
” N.P.T. (the model TYPE 75 has a
3
/
4
”) 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.
(continued next page)
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