American Dryer Corp ADG-530 technical manual Inches W.C

b) Start the dryer ... with the burner on, the correct water column (W.C.) reading in inches should be:

Natural Gas	3.5	- 4 inches W.C.
L.P. (liquid propane) Gas	10.5	- 11 inches W.C.

When a gas dryer is first started (during initial time of installation/start-up), it has a tendency not to ignite on the first ignition attempt. This is due to the fact that the gas supply piping is filled with air, so it may take a few minutes for the air to be purged from the supply lines. During this purge period, there may be insufficient gas pressure for ignition, which might cause the HSI module to go into the LOCK- OUT MODE (the L.E.D. will LIGHT “RED” CONTINUOUSLY).

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

NOTE: To reset the HSI MODULE if it is in the LOCKOUT MODE, open and close the main door then restart the dryer.

2)Flame Sensor

a)Flame Sensor Fault Code

The HSI Module is equipped with a diagnostic circuit that detects a fault in the Flame Sensor Probe or any related circuits in the internal circuits in the HSI module. When a fault is detected, the “red” L.E.D. (light emitting diode) indicator light will flash 2 blinks. To clear this code either discontinue power to the dryer/HSI Module or replace the FLAME PROBE or HSI MODULE.

b)Flame Sensor Current Check

Flame current is the current which passes through the flame from the Flame Sensor to ground (GND). The minimum flame current necessary to keep the HSI system from LOCK- OUT is .7 microamps. To measure flame current, connect an analog D.C. (direct current) microammeter to the FC1/FC2 terminals (refer to the adjoining illustration).

The metershould read .7 microamps or higher. If the meter reads below “0” on the scale, then the meter leads are reversed. Disconnect power and reconnect the meter leads for proper polarity.

FLAME SENSOR CURRENT CHECK

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