American Dryer Corp MDG-75 manual Preoperational Tests, Gas Dryers

I. PREOPERATIONAL TESTS

ALL dryers are thoroughly tested and inspected before leaving the factory. However, a preoperational test should be performed before the dryer is publicly used. It is possible that adjustments have changed in transit or due to marginal location (installation) conditions.

1.Turn on electric power to the dryer.

a. Open ALL shut-off valves - Gas Models ONLY

2.Refer to the Operating Instructions for starting your particular model dryer.

Gas Dryers

When a gas dryer is first started (during initial start-up), it has a tendency not to ignite on the first ignition attempt. This is because the gas supply piping is filled with air, so it may take a few minutes for the air to be purged from the lines.

NOTE: During the purging period, check to be sure that ALL gas shut-off valves are open.

NOTE: Gas Dryers are equipped with a Hot Surface Ignition (HSI) system which has internal diagnostics. If ignition is not established within three times, the heat circuit in the HSI module will lock out until it is manually reset. To reset the HSI system, open and close the main door and restart the dryer.

A gas pressure test should be taken at the gas valve pressure tap of each dryer to assure that the water column pressure (W.C.) is correct and consistent.

NOTE: Water column pressure requirements (measured at the pressure tap of the gas valve body):

Natural Gas	3.5 -Inches Water Column (W.C.)
L.P. Gas	10.5 -Inches Water Column (W.C.)

IMPORTANT: There is no regulator provided in an L.P. dryer. The water column pressure must be regulated at the source (L.P. tank), or an external regulator must be added to each dryer.

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