American Dryer Corp. T20 - Manual (Page 20)

20 JLA Limited 113428-9
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Regulated Gas Valve
Refer to “Gas Pressure Adjustment” on this page to adjust the
gas valve to the appropriate burner pressure listed on page
17. The supply pressure must also match what is listed on
page 17 for the type of gas to be used.
Important
Conversions done improperly can result in a fire or
explosion!
Conversion from Propane
or Butane Gas to Natural Gas
The following conversion allows the dryer to be operated with
natural gas.
Parts Required for Conversion:
Description P/N Qty
Vent Cap and Spring 140415 2*
Burner Orifice (Injector) ** 2*
* This includes 1 for each pocket (tumbler).
** Refer to page 17 for orifice (injector) size.
Instructions
Disconnect electrical power to the dryer.
Close all shutoff valves (for both top and bottom tumbler) in
dryer’s gas supply line.
Important
The following procedures must be performed on
both top and bottom tumblers.
Open the panels located just below each loading door.
Locate the gas train and disconnect the union, 3 electrical
plugs, and the gas train mounting screws from the burner.
Carefully slide the gas train out of the gas train enclosure.
(The carbon ignitor located at the far end of the gas train is
very fragile.)
Remove 2 burner tube mounting screws and remove burner
tube in order to gain access to the orifice.
Using a 3/8” wrench or socket, remove the existing orifice and
replace it with an orifice from the kit.
Important
Use extreme care when removing and replacing
orifice (injector). This orifice (injector) is made of
brass, which is easily damaged.
Reinstall the burner tube onto the burner base.
Select from the following 3 options, the conversion to be
performed:
• Converting from unregulated L.P. to regulated
natural gas: use a flat screwdriver to remove the cap
with blocking pin and install the regulator vent cap from
the kit (P/N 140415).
• Converting from unregulated L.P. to unregulated
natural gas: no change to the regulator is required.
• Converting from regulated L.P. to regulated natural
gas: remove the white plastic regulator adjustment
screw (under vent cape). Remove spring under screw
and replace with spring from kit (P/N 140415). Replace
regulator adjustment screw.
Install the gas train back into the dryer gas train enclosure.
Be sure the tab at the rear of the gas train engages into the
mounting slot.
Connect the union and the 3 electrical plugs.
Repeat these steps for the other burner.
Open all shutoff valves, reconnect electrical power to the dryer,
and test for leaks.
Operate the dryer through 1 complete cycle to ensure proper
operation.
With dryer operating, check the manifold (burner) pressure at
the tap on the gas valve to ensure proper operating pressure
(refer to chart on page 17).
Gas Pressure Adjustment
Disconnect electrical power to the dryer.
Important
The following procedures must be performed on
both top and bottom tumblers.
To adjust gas valve’s internal regulator, remove the regulator
vent cap with the regulator adjustment tool, which is located
on the back guard between the gas inlet and exhaust outlet
(refer to the illustration on next page for proper use of
adjustment tool). Be sure to use one of the wide ends of the
adjustment tool for removal of the vent cap. Once vent cap is
removed, the narrow end of the adjustment tool can be used
to turn the plastic adjustment screw in the valve. Turn the
screw clockwise to raise pressure and counterclockwise to
lower pressure.
Gas (burner) pressures are measured with the burner in
operation for all burner adjustment conditions. Therefore once
the necessary adjustments have been made, the dryer must
be operated in a heating cycle to verify that the pressure is
correct. If it is not correct, you must discontinue the power to
the unit and make further adjustments. Repeat these steps
as many times as necessary to achieve the correct burner
pressure. Once the adjustment of the valve is complete, the
vent cap must be replaced and sealed with, for example, paint
to prevent maladjustment by the user.
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