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Technical Support: +1 (724) 628 3050
SERVICE
1. An “Air Switch Not Ready” alarm is an immediate air switch replacement event.
2. To verify pressure to the air switch:
a. Connect a Manometer hose to the 1/4” aluminum air tube which feeds the silicon air
tube connected to the air switch.
b. Turn the oven on and measure the air pressure supplied by the tube. If 0.5 inW.C. or
more is present, the air switch should be functioning.
c. If the pressure is low, the air tube system needs to be evaluated. The pressure to the air switch comes
from the plenum.
3. Turn on the oven and verify MAINS voltage on each side of the air switch after the main fan spins up. If
voltage is present on one side and not the other, replace the Air Switch.
4. The plenum atmosphere is transferred through a 0.5 inch stainless tube which terminates inside of
the yellow air stopper. If the tube is not fully seated within the plenum and air stopper, or the tubes are
damaged, pressure will be lost.
5. If the air switch is passing voltage reliably when engaged, the supplied pressure to the switch is good and
the fault can be assume to be elsewhere. *Detection occurs on the control system (MC), at P9(6), which is
largest 16 pin connector. See THERMOCOUPLE verication section for further information.
AIR SWITCH
PART FAILURE VERIFICATION
CONTROLS AND ASSEMBLIES (CONTINUED)
FIGURE 4-48 FIGURE 4-49
SILICON AIR TUBE
(P/N: 135060)
ALUMINIUM AIR TUBE
(P/N: 135059-SRV)
AIR STOPPER
(P/N: 400008)
THERMOCOUPLE
• EDGE1830 (P/N: 135055-18)
• EDGExx40 (P/N: 135055-23)
• EDGExx60 (P/N: 135055-32)
• EDGExx70 (P/N: 135055-37)
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