47. Gas System
Service-
manual
487 03 29 41
4
47
Measuring tap, nozzle pressure (pos. 2)
1. With the dryer off, loosen the gas pressure
tap (pos. 2) one-quarter of a turn and connect a
manometer to the tap.
2. Remove the ignition cable from the ignition
electrode and position it so the end of the cable is at
least 2 inches from any metal surface and away from
any area into which you must reach to carry out this
procedure.
This prevents the burner from lighting.
3. Start the dryer with High heat selected.
After a few seconds, the ignition control will energize
the gas valve.
Check that the nozzle pressure reading on the
manometer is within the allowable range specified in
the installation manual for the gas type being used.
Too high nozzle pressure
If the nozzle pressure is too high, adjust it by
removing the cap (pos. 3) and turning the screw (pos.
4) beneath this cap counter-clockwise until the nozzle
pressure is correct.
Too low nozzle pressure
If the nozzle pressure is too low, it may be due to
limited gas flow (and pressure) on the supply side of
the valve.
1. Turn off the dryer
2. Close the nozzle pressure measuring tap (pos. 2)
and measure the supply pressure tap (as described
in section Measuring tap, supply pressure below).
The supply pressure must remain AT LEAST 1.5
inches WC above the desired nozzle pressure.
If it does not, corrective action must be taken on the
gas supply system to the dryer.
If the supply side pressure remains at least 1.5
inches WC above the desired nozzle pressure, the
nozzle pressure can be increased as described
above, with the manometer connected to pressure
tap (pos. 2) by turning screw (pos. 4) beneath cap
(pos. 3) clockwise.
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