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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 direct spark ignition (DSI) system which has internal diagnostics. If
ignition is not established after the first attempt, the heat circuit DSI module will lock out until it is
manually reset. To reset the DSI system, open and close main door and restart 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 pressure is correct and consistent.
NOTE: Water column (W.C.) pressure requirements (measured at the gas valve pressure tap)...
NATURAL GAS --- 3.5 INCHES W.C.
L.P. GAS ---------- 10.5 INCHES 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.
b. Electric Models
1) Check the oven contactors to insure that the electric oven is cycling properly.
c. Steam Models
1) Check to insure that steam damper is functioning properly.
a) The steam damper should not "slam" (open/closed) when it reaches the end of (piston) travel.
Additionally, the steam damper should not bind or stop during travel. If either of these
conditions occur, the flow control must be adjusted. Refer to the bottom illustration on page 36
for air adjustment instructions.
6. Make a complete operational check of ALL safety-related circuits (i.e., lint drawer switch, and sail switch
on gas models).