COINWASH T3300S, Service Manual

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47.3
47. Gas system
47
Service
manual
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.