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Gas Pressure Testing
For proper operation, the gas pressure must be correct,
consistent and maintained at the gas pressure rates shown
on page 21. Provisions are made at the gas valve for taking
gas pressure readings.
There are two types of devices used to measure gas
pressure. They are the spring/mechanical type gauge and
the manometer. The use of the spring/mechanical type
gauge is not recommended because they are very easily
damaged and are not always accurate. The preferred type
of gauge is the manometer because it is a simple device to
use and is highly accurate. A manometer is simply a glass
or transparent plastic tube with a scale graduated in inches
or millibar. When it is filled with water and pressure is
applied, the water in the tube rises, showing the exact gas
pressure.
Gas Pressure Test Procedure
Turn gas cock in gas supply line to “OFF” position.
50 Hz dryers: Back out miniature screw inside pressure tap
and attach manometer (refer to the illustration on page 23).
60 Hz dryers: Install pressure tap and attach manometer
(refer to the illustration on page 23).
Turn gas cock to “ON” position.
Start the dryer in Heat Mode and wait for ignition. Gas
manifold pressure should be as shown on page 21.
If the gas pressure needs to be adjusted, refer to “Gas
Pressure Adjustment” on page 24.
Once test is complete, turn gas cock to “OFF” position.
Remove manometer. Tighten screw inside the pressure
tap or install plug.
Turn gas cock to “ON” position and check for leaks with
soap solution with main burner “ON.”
Steam Information ____________________
It is your responsibility to have all plumbing connections
made by a qualified professional to ensure that the steam
plumbing installation is adequate and conforms with local,
state, and country regulations or codes.
Care must be exercised when leveling steam dryers into
final position. After leveling the dryer, check the downward
pitch of the heat exchanger from front to rear with a level.
Likewise, check the downward pitch of the return condensate
manifold toward its outlet part. Absence of these downward
pitches will result in probable water hammer and premature
heat exchanger fracture and leakage.
The presence of condensate in the steam will cause water
hammer and subsequent heat exchanger failure. The steam
supply connection must be taken from the top of a
well-dripped steam main. If the supply run-out to the dryer
exceeds 25 feet (7.6 meters), it should be dripped just before
the control valve with a proper trap and dirt pocket.
IMPORTANT: Failure to comply with the requirements
stipulated in this manual can result in component failure,
which will void the warranty.
Steam Coil pH Level
The normal pH level for copper type steam coils must be
maintained between a value of 8.5 to 9.5. For steel type
steam coils the pH level must be maintained between a
value of 9.5 to 10.5. These limits are set to limit the acid
attack of the steam coils.
IMPORTANT: Coil failure due to improper pH level will
void the warranty.
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