Vmac RAPTAIR-G30, Service Manual

Page: 71 / 96

VMAC
– Vehicle Mounted Air Compressors
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69
Temperature switch
The temperature switch on the VMAC gas drive is normally closed and
becomes an open circuit at 140 °C (290 °F). The temperature switch is
located in the top of the WHASP tank cooler (Figure 54).
If the compressor oil temperature exceeds 140 °C (290 °F), the
thermostatic switch will disable the engine ignition system, but the cooling
fan will remain running as long as the key switch is in the
“On” position.
Figure 54 - Temperature switch location
The engine will not run until the temperature switch is
closed (the compressor system has cooled).
Testing
1) Disconnect the two spade wire connectors from the temperature
switch (Figure 55).
2) Use a multimeter to measure the resistance through the switch, at
room temperature the multimeter should display
0 Ω, or very little
resistance.
Figure 55 - Temperature switch