American Dryer Corp. MLG-130DR (HSI) User Manual
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IMPORTANT: Dryer blower motor impellor/fan as viewed from the front must turn in the clockwise
(CW) direction, otherwise the dryer efficiency will be drastically reduced and
premature component failure can result.
5. Heat Circuit Operational Test
a. Gas Models
1) When the dryer is first started (during initial start-up), the burner has a tendency not to ignite on the
first attempt. This is because the gas supply piping is filled with air, so it may take a few minutes for
this air to be purged from the lines.
2) The dryer is equipped with a Hot Surface Ignition (HSI) system which has internal diagnostics. If
ignition is not established after three (3) attempts, the heat circuit HSI module will LOCKOUT until
it is manually reset. To reset the HSI system, open and close the main door and restart the dryer
(press the ENTER/START key).
NOTE: During the purging period, check to be sure that ALL gas shut-off valves are open.
3) Once ignition is established, a gas pressure test should be taken at the gas valve pressure tap of
each dryer to assure that the water column (W.C.) pressure is correct and consistent.
NOTE: Water column pressure requirements (measured at the gas valve pressure tap)...
Natural Gas ---- 3.5 Inches W.C. (8.7 mb).
L.P. Gas-------- 10.5 Inches W.C. (26.1 mb).
IMPORTANT: There is no regulator provided in an L.P. dryer. The water column (W.C.) pressure
must be regulated at the source (L.P. tank) or an external regulator must be added to
each dryer.
6. Make a complete operational check of ALL safety-related circuits (i.e., lint drawer switch, and sail switch
on gas models).
NOTE: To check for proper sail switch operation, open the main door and while holding main door
switch plunger in, start the dryer. The dryer should start but the heat circuit should not be
activated (on). If the heat (burner) does activate, shut the dryer off and make the necessary
adjustments.
7. A reversing tumbler (basket) dryer should never be operated with less than a 60 lb. (2.72 kg) load (dry
weight). The size of the load will affect the coast-down and dwell (stop) times. The tumbler (basket) must
come to a complete stop before starting in the opposite direction.
a. Microprocessor (computer) Dryer Models
1) Spin and stop are not adjustable in the Automatic Mode and have been preprogrammed into the
microprocessor controller (computer) for 150-seconds spin time in the forward direction and
120-seconds in the reverse direction with a 5-second dwell (stop) time.