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a) Connect water column (W.C.) test gauge (manometer) to the gas valve pressure tap (1/8”
N.P.T.).
b) Start the dryer...with the burner on, the correct water column reading in inches
should be:
Natural Gas .................................. 3.5 inches (8.7 mb) water column.
Liquid Propane (L.P.) Gas ............ 10.5 inches (27.4 mb) water column.
When a gas dryer is first started (during initial time of installation or 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 Direct
Spark Ignition (DSI) module to go into the LOCKOUT mode (the light emitting diode [L.E.D.]
will BLINK “GREEN” CONTINUOUSLY).
NOTE:
During the purge period, check to be sure that
ALL
gas shutoff valves are open.
NOTE:
To reset the DSI module if it is in the LOCKOUT mode, open and close the main door then
restart the dryer.
2) Ignitor/Flame-Probe Assembly Adjustments
The ignitor/flame-probe assembly consists of a ceramic insulated ignitor electrode, a ground rod, and
a ceramic insulated flame-probe electrode. The gap between the ignitor electrode and the ground
rod is set, and
must be
maintained at 1/8” +/- 1/32” (3.175 mm +/- 0.79248 mm). When the DSI
module provides the high voltage (HV) synchronous spark (14,000 volts) through the high voltage
(HV) lead, a spark is produced over the gap. When this spark is produced, the gas valve is opened.
Upon ignition, the resistance in the flame-probe electrode (of the ignitor/flame-probe assembly)
changes. Once the resistance is changed, it initializes the DSI to sustain the gas flow (from the gas
valve).
IMPORTANT:
The gap setting on the ignitor/flame-probe assembly is critical.
a) DSI Ignitor/Flame-Probe Assembly
Adjustments (TUBE BURNER TYPE)
(1) The gap on the ignitor/flame-probe assembly
must
be
set, and held at 1/8” +/- 1/32” (3.175 mm +/-
0.79248 mm). If this 1/8” gap is not maintained
(if the gap is either too large or too small), the
DSI module will indicate a system malfunction
and go into the LOCKOUT mode (L.E.D. will
BLINK “GREEN CONTINUOUSLY).
Summary of Contents for AD-540
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